Abstract: The present invention relates to methods for selectively converting oxygenates to light olefins, preferably ethylene and propylene, in which desirable carbonaceous deposits are maintained on a total reaction volume of catalyst by totally regenerating only a portion of the total reaction volume of catalyst and mixing the regenerated portion with the unregenerated total reaction volume of catalyst.

Abstract: A cerium oxide with pores having a uniform lamellar structure. The pores may be at least partially arranged in substantially parallel directions and may also extend throughout the grain. The method for preparing said cerium oxide comprises heat treating a compound that essentially consists of cerium carbonate octahydrate. The atmosphere in which the treatment is performed includes an air/steam or oxygen/steam mixture with a steam volume fraction of at least 40%. Said cerium oxide is particularly useful as a catalyst, especially in motor vehicle post-combustion catalysis.

Abstract: A phosphorus-doped silver catalyst fixed bed is obtainable byI. arranging silver crystals obtained by electrolytic deposition of silver from an aqueous silver salt solution to form a starting silver catalyst fixed bed,II. producing an activated silver catalyst fixed bed from the starting silver catalyst fixed bed by passing through the latter, at from 150 to 800.degree. C., a gas mixture comprising methanol and oxygen (gas mixture M), andIII. bringing the activated silver catalyst fixed bed into contact with from 1 to 20,000 ppm by weight of phosphorus, based on the silver, in the form of a finely divided phosphorus compound having a melting point or decomposition temperature of more than 500.degree. C. (phosphorus compound P).

Abstract: This invention relates to a method for sulfiding hydrocarbon conversion catalysts, e.g., hydrotreating catalysts comprising at least one metal sulfide and passivating said sulfided catalyst. The catalysts which may be treated by the method of the present invention comprise an alumina or an silica-alumina support e.g., a zeolite, and at least one Group VI metal sulfide and/or at least one Group VIII metal sulfide. In particular, the present invention provides a process for continuously activating a fresh or regenerated catalyst comprising at least one Group VI or Group VIII metal oxide supported on a particulate refractory oxide support material by converting substantially all of said Group VI or Group VIII metal oxide to the corresponding metal sulfide and passivating the resulting activated catalyst.

Abstract: Stabilization of a reduced copper catalyst by a) passivating the catalyst by passing a gas stream that is free of reducing gases and which contains 0.05 to 0.5% by volume of oxygen and an amount of carbon dioxide at least twice the amount of oxygen through a bed of the catalyst until the catalyst is passivated, the proportion of oxygen in said gas stream and the temperature at which it is fed to the bed being such that the temperature of the catalyst does not rise to above 100.degree. C. during said passivation step, and then b) increasing the oxygen content of the gas passing through the bed until the oxygen partial pressure corresponds to that of air at atmospheric pressure. The process may be applied to the stabilization of fresh reduced catalysts or to the stabilization of used, e.g. spent catalysts, before discharge thereof from a reactor.

Abstract: Homogeneous catalytic regenerative heat transfer packing material is made by impregnating ceramic packing material with a solution of a catalyst precursor and then fixing the precursor into catalyst form. The catalyzed packing material is suitable for use in a process for the regenerative catalytic oxidation of waste gases, in particular, gases that include volatile organic compounds, carbon monoxide or combinations thereof.

Abstract: A process of regenerating a sulfided sorbent is provided. According to the process of the invention, a substantial portion of the energy necessary to initiate the regeneration reaction is provided by the combustion of a particulate metal sulfide additive. In using the particulate metal sulfide additive, the oxygen-containing gas used to regenerate the sulfided sorbent can be fed to the regeneration zone without heating or at a lower temperature than used in conventional processes wherein the regeneration reaction is initiated only by heating the oxygen-containing. The particulate metal sulfide additive is preferably an inexpensive mineral ore such as iron pyrite which does not adversely affect the regeneration or corresponding desulfurization reactions. The invention further includes a sorbent composition comprising the particulate metal sulfide additive in admixture with an active metal oxide sorbent capable of removing one or more sulfur compounds from a sulfur-containing gas stream.

Abstract: Coke is burned in the regenerator vessel of an FCC complex with a combustion medium consisting of a diluent gas, such as air, enriched with oxygen, The regenerator is operated in partial combustion mode and excess oxygen is introduced into the combustion zone of the regenerator. Emission of nitrogen oxides to the atmosphere is reduced.

Abstract: A process for regenerating a coke contaminated reforming catalyst comprising platinum on a molecular sieve, said process consisting essentially of contacting said catalyst with a halogen-free oxygen-containing gas at a temperature of less than 780.degree. F. for a sufficient period of time such that the aromatization activity is restored to within 20.degree. F. of the activity said catalyst possessed at the start of the previous run cycle.

Abstract: A process for the regeneration of a sulfur containing catalysts, wherein the catalyst is stripped of sulfur before the oxychlorination treatment of the regeneration process, typically before the catalyst is sent to the regeneration zone. The process is particularly useful for catalyst employed in hydrocarbon conversions such as dehydrogenation reactions, particularly those which comprise the injection of sulfur and/or at least one sulfur compound before or simultaneously to the introduction of the charge into the first reaction zone.

Abstract: A catalyst composition containing one or more binary oxides of palladium and rare earth metal such as Ce, La, Nd, Pr and/or Sm. The catalyst composition is used for the catalytic combustion of gaseous combustion mixtures of oxygen and carbonaceous fuels such as methane, e.g., a natural gas/air combustion mixture. Specific preferred binary oxides may be, for example, M.sub.2 O.sub.3.PdO (e.g., La.sub.2 O.sub.3.PdO) or 2M.sub.2 O.sub.3.PdO, wherein in each case M is La, Nd or Sm. A process of combusting gaseous carbonaceous fuels includes contacting a catalyst as described above under combustion conditions, e.g., 925.degree. C. to 1650.degree. C. and 1 to 20 atmospheres pressure, to carry out sustained combustion of the combustion mixture, including catalytically supported thermal combustion. Regeneration of over-temperatured M.sub.2 O.sub.3.PdO catalyst is also provided for.

Abstract: An FCC arrangement uses a regenerator stripper vessel for removing CO and light hydrocarbons upstream of the regeneration zone that can operate with backmix addition of regenerated catalyst directly from the regeneration zone. The regenerator stripping vessel can also serve as a blending vessel for an the transfer of spent and regenerated catalyst back to the reaction zone for increasing the catalyst to oil ratio of the process. This invention makes the recycle of spent catalyst in large proportions possible for an FCC operation that cracks a heavy feed by eliminating light combustibles such as CO and light hydrocarbons from the regeneration zone. Elimination of light gases permits spent catalyst to be recycled to the riser despite the high delta coke produced by the heavy feed.

Abstract: The invention concerns a process for the regeneration of a used hydrocarbon treatment catalyst, preferably a reforming catalyst, containing at least one precious metal preferably platinum, optionally at least one additional metal selected from the group formed by metals from groups 7, 8, 9, 10, 13 and 14 of the periodic classification of the elements and copper, optionally and preferably at least one halogen, preferably chlorine, and at least one porous support, preferably alumina, said process comprising at least one of the following two successive steps: at least one step (1) for the combustion of the coke present on said catalyst, carried out in the presence of an oxygen-containing gas, at a temperature in the range of 300.degree. C. to 680.degree. C. for a time in the range 0.3 to 7 hours, at least one step (2) for oxyhalogenation, preferably oxychlorination, carried out in a controlled air atmosphere, at a temperature in the range 350.degree. C. to 550.degree. C., for a time in the range 0.

Abstract: An improved method and apparatus for regeneration and reuse of He--N.sub.2 --CO.sub.2 mixed gas for carbon dioxide gas laser. The laser gas after use is contacted with a noble metal catalyst (for example, Pt--Al.sub.2 O.sub.3) at a temperature of 200.degree.-300.degree. C. to react CO and O.sub.2 formed by laser discharge so as to form CO.sub.2. A suitable quantity of moisture in the contained laser gas causes steam-reforming reaction of H.sub.2 O and CO, and reaction of H.sub.2 and O.sub.2 following thereto, and continuous operation over a long period is thus possible. Poisoning of the catalyst by NO.sub.x is suppressed at this relatively high temperature of reaction. Activity of the catalyst, when decreased, may be recovered by reactivation by passing a reactivating gas consisting of carbon monoxide, oxygen and helium through the catalyst bed at a temperature of 400.degree. to 500.degree. C.

Abstract: Oxides of nitrogen (NO.sub.x) emissions from an FCC regenerator are reduced by operating the regenerator in partial CO burn mode to produce flue gas with more CO than O.sub.2 and with NO.sub.x precursors. This flue gas is then enriched with controlled amounts of oxygen and charged over catalyst, preferably Group VIII noble metal on a support, to convert most NO.sub.x precursors to nitrogen. Flue gas may then be charged to a CO boiler. Eliminating more than 90% of NO.sub.x emissions is possible by operating the FCC regenerator in partial CO burn mode, then adding air and catalytically converting NO.sub.x precursors at substoichiometric conditions. Conversion of NO.sub.x, if formed in the regenerator, may be achieved as well.

Abstract: Spent FCC catalyst is regenerated under net reducing conditions in a regenerator to minimize the migration of vanadium on the spent FCC catalyst particles. Reducing conditions in at least the bottom 50% of the catalyst bed are maintained by using at least two air distribution grids located in the lower 50% of the catalyst bed.

Abstract: A regeneration process is described that eliminates or greatly reduces thermal channelling in a cooling zone bed. The method controls the flow rate of cooling gas independently of the requirements of the regeneration process for combusting coke and for halogenating or drying the catalyst. In one embodiment, a portion of a cooling stream is bypassed around a cooling zone and then passed to a drying zone. In another embodiment, one portion of a cooling stream from a cooling zone is vented, and another portion of the stream is passed to a drying zone.

Abstract: Process for the regeneration of a fluorination catalyst based on Cr(III) compounds optionally supported, which comprise a) treatment at 350.degree.-40.degree. C. with an air/inert gas mixture and b) treatment at 300.degree.-380.degree. C. with a mixture of an inert gas containing from 0.5 to 5% by volume of an aliphatic hydrocarbon C.sub.1 -C.sub.8.

Abstract: A method for the hydrodechlorination of a reaction gas primarily composed of chlorinated hydrocarbons is carried out sequentially. A first step is advantageously carried out in a tubular reactor filled with catalyst and cooled externally, to maintain a temperature within a preferred range of 80.degree. to 230.degree. C. and a radial temperature difference of not more than 40.degree. C. Hydrogen is added to the tubular reactor with a hydrogen excess in a preferred range of 1.1 to 1.5 relative to the reaction gas, based on the stoichiometric consumption. The catalyst is present in a catalyst loading in a preferred range of 0.1 to 1.5 v/vh based on the volume of reaction gas. A fixed bed reactor is advantageously used for a second step, optimally connected in straight transit with the output of the reactor of the first step. The full-space reactor is maintained at a temperature within a preferred range of 200.degree. to 300.degree. C.

Abstract: The activity of titanium-containing heterogeneous catalysts such as titania-on-silica which have been used to catalyze olefin epoxidation is effectively restored by heating in the presence of oxygen at a temperature of 700.degree. C. or greater. Epoxide selectivity is enhanced by treatment of the heated catalyst with a silylating agent, even where the used catalyst had been silylated when initially prepared.

Abstract: A regenerator in a FCC unit, with the reactor elevated above the regenerator and a side entry spent catalyst introduction to the regenerator, is modified by installing a spent catalyst distribution apparatus along a central vertical axis of the regenerator to radially discharge the spent catalyst and 10-50 percent of the regeneration air into the dense phase of the catalyst. The existing compressor may be used to supply the regeneration air to the spent catalyst distributor. The remaining 50-90 percent of the regeneration air is supplied to the air distribution grid. The retrofit improves spent catalyst distribution and mixing in the regenerator to avoid dilute phase CO combustion or afterburning in the offgas.

Abstract: A titanium-containing molecular sieve which has been used as an oxidation catalyst is regenerated to provide a level of performance comparable to that of freshly prepared catalyst by heating at less than 400.degree. C. in the presence of molecular oxygen. The same batch of catalyst thus may be used over an extended period of time in a continuous epoxidation process by periodic practice of the aforedescribed reactivation method.

Abstract: Process for regenerating a fluorination catalyst The invention relates to a process for regenerating a fluorination catalyst containing chromium and magnesium after use in a fluorination reaction, in which the used catalyst is treated with a mixture comprising at least 10 mol % of HF, from 30 to 90 mol % of O.sub.2 and from 0 to 60 mol % of inert gas.

Abstract: A method and an apparatus are disclosed for desorbing TEDA by utilizing a fluidized bed so as to reuse a used impregnated active carbon for the purpose of removing toxic materials from a fluid. The impregnated active carbon is injected into a fluidized bed at a high temperature to carry out a desorbing process, in such a manner that TEDA and CH.sub.3 l are desorbed from the impregnated active carbon at a high temperature by utilizing the high volatility of TEDA and CH.sub.3 l. If a heated air is injected through an air inlet into the desorbing tower, the high temperature air and the used impregnated active carbon are met in a fluidized state, with the result that the active carbon with TEDA and CH.sub.3 l desorbed is discharged.

Abstract: Oxides of nitrogen (NO.sub.x) emissions from an FCC regenerator are reduced by operating the regenerator in partial CO burn mode and controlled turbulent/laminar flow processing of the flue gas. Partial CO burn FCC catalyst regeneration produces flue gas with CO and NO.sub.x precursors. Air is added to a turbulent flow reactor such as a flue gas transfer line where most NO.sub.x precursors are homogeneously converted while leaving some CO unconverted. A downstream CO boiler thermally converts this unconverted CO. NO.sub.x emissions are less than would be experienced using a like amount of air injection to a conventional CO boiler.

Abstract: Oxides of nitrogen (NO.sub.x) emissions from an FCC regenerator are reduced by operating the regenerator in partial CO burn mode and controlled thermal and catalytic processing of the flue gas. Partial CO burn FCC catalyst regeneration produces flue gas with CO and NO.sub.x precursors. Air is added and most NO.sub.x precursors homogeneously converted while leaving some CO unconverted. Downstream catalytic conversion then reduces produced NO.sub.x with unconverted CO.

Abstract: A process for regenerating used catalysts having deposited on their surface contaminants comprising carbonaceous and/or sulfur-containing materials which comprises:a) contacting said particles in a fluidized bed with an oxygen-containing gas at an elevated temperature for a time which does not exceed about twenty minutes wherein at least about fifty percent by weight of the sulfur contaminants are removed, andb) passing the thus treated catalyst particles to a moving belt and causing the belt to move said catalyst particles through a furnace for at least about two hours, wherein said furnace is maintained at a temperature sufficient to remove the remaining portion of the contaminants from the particles.

Abstract: A regenerative process for the preparation of olefinically unsaturated compounds by oxidation/dehydrogenation of selectively oxidizable hydrocarbons over an oxygen carrier acting as catalyst, in the absence of molecular oxygen, alternating (in repeated cycles) with regeneration of the spent oxygen carrier with a gaseous molecular oxidizing agent, in which the spent (reduced) catalyst is cooled, prior to introduction of the regenerating gas, to a temperature which is below the temperature of the reaction, regeneration being controlled in such a manner that the highest temperature occurring during regeneration does not exceed the temperature of reaction at which dehydrogenation is commenced.

Abstract: Continuous process for the skeletal isomerization of n-olefins containing at the most 20 carbon atoms, in the presence of a catalyst essentially constituted by alumina and titanium, in which a charge containing the said n-olefins is made to flow through at least one fluidized bed reaction zone, the catalyst flowing into each reaction zone. The catalyst drawn off from the final reaction zone is passed into a regeneration zone, at the outlet of which it is passed into a zone where it undergoes a steam treatment prior to its reintroduction into the first reaction zone. The process is performed in the presence of steam, so that the catalyst is in contact with 3 to 85 wt. % (based on the catalyst weight) of steam. The water/olefin charge molar ratio in the reaction zone is between 0.1 and 3.

Abstract: The present invention relates to processes of regenerating Ni catalysts which had been used in a hydrogenation of unsaturated fatty oil or petroleum resin, which comprise separating the Ni-extracted solution and support by extracting the pretreated Ni catalysts with an acid, preparing support-containing solution by burning the separated support in the flow of air or oxygen diluted with nitrogen at the temperature of 300.degree. to 800.degree. C.

Abstract: This invention relates to a process in which a linear olefin is converted under isomerizing conditions to its corresponding methyl branched isoolefin by contact at a temperature of from 200.degree. C. to 650.degree. C. with an isomerizing catalyst comprising (i) at least one zeolite having only in one dimension a pore structure having a pore size small enough to retard by-product dimerization and coke formation and large enough to permit entry of the linear olefin and allow formation of the methyl branched isoolefin, (ii) an alumina binder and (iii) up to about 15% by weight of coke oxidation-promoting metal. After a period of operation, when sufficient coke has deposited on the catalyst in an amount to significantly reduce the activity of the catalyst, the catalyst is stripped of hydrocarbon and then contacted at elevated temperature with an oxygen-containing gas for a sufficient time to burn off the coke, i.e., to regenerate the catalyst at a temperature of less than about 565.degree. C.

Abstract: 3,4-Epoxy-1-butene is prepared by the gas phase epoxidation of 1,3-butadiene by means of oxygen or oxygen-containing gases over silver-containing catalysts and isolation of the 3,4-epoxy-1-butene from the reaction exit mixture by performing the gas phase epoxidation in the presence of from 6 to 80 mol % of water vapor, based on the gas mixture supplied to the reactor.

Abstract: A method of decreasing the level of NOx, CO and SO.sub.2 emissions in a gas turbine is disclosed. A catalyst absorber, preferably made of alumina/platinum/carbonate salt, is used to oxidize the pollutant oxides and absorb them. The catalyst absorber can then be regenerated and reused. An apparatus for treating the stack gases and a method of making the catalyst absorber are also described.

Abstract: Disclosed are a process for producing an unsaturated aldehyde and an unsaturated carboxylic acid which comprises subjecting propylene, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of (i) a catalyst comprising composite oxide of the formula Mo.sub.a Bi.sub.b Fe.sub.c A.sub.d B.sub.e C.sub.f D.sub.g O.sub.x and (ii) a molybdenum oxide which in itself is substantially inert to the gas phase catalytic oxidation; a process for reusing the catalyst deteriorated due to the gas phase catalytic oxidation after mixing it with the molybdenum oxide; and a method of regenerating the deteriorated catalyst by mixing it with the molybdenum oxide.

Abstract: A cobalt catalyst for use in the Fischer Tropsch reaction of synthesis gas to form hydrocarbons is activated or regenerated by treatment of a cobalt containing catalyst with a gas containing carbon monoxide, said gas containing less than 30% v hydrogen. The catalyst obtained has increased activity and greater selectivity towards producing C.sub.5+ hydrocarbons.

Abstract: The present invention concerns a regeneration process for a catalyst containing at least one metallic element selected from the group formed by platinum, palladium, ruthenium, rhodium, osmium, iridium and nickel, preferably platinum, on a refractory oxide based support, which has been deactivated by coke deposition. The regeneration process is characterised in that said regeneration consists of treatment with a gas containing at least chlorine and molecular oxygen, at a temperature between 20.degree. C. and 800.degree. C. and a total gas flow rate, expressed in liters of gas per hour and per gram of catalyst, of between 0.05 and 20. The process at least restores the initial catalytic properties of the catalyst.

Abstract: Coke deposits are removed from particulates by combustion in a regenerator by a process in which air is initially used as the oxidant. The combustion gas is subjected to a separation process to remove nitrogen therefrom, and the remaining carbon dioxide-enriched gas stream is recycled to the regenerator together while substantially pure oxygen is introduced into the regenerator. As the level of carbon dioxide in the system increases, the amount of air being introduced into the regenerator is gradually reduced and, in compensation, the amount of oxygen flowing to the regenerator is gradually increased. Eventually, part or all of the air is replaced by oxygen and carbon dioxide recycle gas, and the level of oxygen and carbon dioxide are regulated to maintain the desired temperature in the regenerator.

Abstract: A method of converting a hydrocarbon feed with a catalyst and regenerating the catalyst by contact with an oxygen-containing stream is disclosed. The hydrocarbon conversion process employs a purification zone that purifies a net gas stream and that also removes water from a circulating regeneration gas stream. This method is useful for the regeneration of reforming catalysts comprising L-zeolite.

Abstract: The invention relates to a process for the regeneration of a deactivated, carbon-covered, fine-grained, heat-resistant catalyst, a pumpable suspension of deactivated catalyst being injected into a hot gas stream and the regenerated catalyst then being separated off from the gas stream.

Abstract: A method of regenerating a sulfur-sensitive hydrocarbon conversion catalyst by employing sulfur-contaminated heat-transfer equipment of a hydrocarbon conversion process is disclosed. This method is useful for the regeneration of reforming catalysts comprising L-zeolite.

Abstract: A method of regenerating V/P/O oxidation catalyst used for the partial oxidation of n-butane which comprises terminating the n-butane feed and contacting the catalyst with an oxygen containing gas, such as air for a sufficient period of time to regenerate the catalyst such that when the n-butane feed is restarted the yield is greater than just before the treatment.

Abstract: A process for regenerating spent multimetal oxide oxidation catalysts from the catalytic gas-phase oxidation of lower organic compounds and which, in fresh form, contain as basic constituents the elements Mo, W, V and Cu in oxidic form, by the action of oxidizing agents or means and solubilizing, aqueous ammonia to which acetic acid and/or the ammonium salt thereof has been added, with subsequent drying and calcination, comprises quantitatively determining the content of metallic constituents during the process and making this content up to the respective original value.

Abstract: Catalytic dehydrogenation wherein feed is passed in one direction through the bed in a first cycle and heating gas is passed in an opposite direction in a second cycle to provide the endothermic heat of reaction and regenerate catalyst. The operation is controlled to balance properly heat absorbed during dehydrogenation and heat input during regeneration; e.g., by having catalyst of different activities over the length of the bed.

Abstract: The invention concerns a process for regenerating an impure catalyst comprising sulphuric acid deposited on silica.It is characterized in that the catalyst is calcined at least once to eliminate organic hydrocarbon substances contained in the catalyst, in particular as a result of its use in aliphatic alkylation reactions.

Abstract: A regeneration process for reconditioning catalyst particles containing platinum by transferring the catalyst particles through a combustion zone and a reconditioning zone is disclosed. Drying of the catalyst particles and redispersion of the platinum occur simultaneously in a single reconditioning zone. Catalyst that enters the reconditioning zone is contacted countercurrently with a heated gas stream containing chlorine and oxygen. A low moisture content of the gas stream aids drying and allows the equilibrium reaction between hydrogen chloride and oxygen on the one hand, and water and chlorine on the other hand to be shifted to chlorine. This shift of the equilibrium reaction can be further improved by maintaining an oxygen-enriched environment within the reconditioning zone. By eliminating the need for separate drying and redispersion zones used previously, the regeneration apparatus is less expensive to build and the regeneration process is less expensive to operate.

Abstract: A method of removing chloride from phosphorus/vanadium/oxygen mixed oxide oxidation catalysts comprising treating a chloride containing catalyst comprising phosphorus, vanadium and oxygen with a stream of gas comprising oxygen, steam and an inert gas at flow rate and temperature and for a period of time to substantially reduce the amount of chloride in the catalyst.

Abstract: A method for regenerating an activated charcoal filter for a spray paint booth exhaust which includes the following steps:a passing a first gas flow of uncontaminated inlet air through the filter;preheating the first gas flow;combining the preheated first gas flow with additional uncontaminated air to form a preheated second gas flow at a predetermined temperature for achieving substantially complete desorption of the activated charcoal filter;recirculating the preheated second gas flow through the filter for desorbing filtered contaminants into the second gas flow;conveying the second gas flow to a heat contributing heat exchanging point for further preheating;pyrolytically oxidizing the further reheated gas flow, at a preselected elevated temperature, thereby oxidizing substantially all of the suspended particles therein;passing a resulting oxidized flow, at elevated temperature, to the heat exchanging point for cooling the oxidized gas flow and contributing exchanged heat to the second gas flow to achieve

Abstract: A method for oxidizing hydrocarbon compounds comprising passing a mixture of the hydrocarbon compound and excess oxygen over a catalyst comprising a carbonaceous substrate doped with a compound selected from the group consisting of metal oxide, metal oxyhalide, and precursors which form metal oxide and metal oxyhalide, and blends thereof under mild reaction conditions. The temperature of the reaction is below about 300.degree. C.

Abstract: There is provided a process for regenerating a coked catalyst comprising a zeolite and a noble metal such as platinum. The process involves treating the coked catalyst under somewhat mild oxidation conditions, whereby a sufficient portion of the coke is removed from the catalyst to restore the hydrocarbon sorption properties of the zeolite component to the level observed in the non-coked form. Surprisingly, the original activity of the catalyst is substantially restored, even though a substantial amount of coke remains on the regenerated catalyst.

Abstract: Disclosed is a method for starting up a cyclic or semi-cyclic reforming reactor after catalyst regeneration. The method mitigates disruptions to the reforming unit after catalyst regeneration, such as excessive light gas make and a decrease in recycle hydrogen purity.