Abstract: A catalyst comprising an iridium supported on at least one carrier selected from the group consisting of metal carbides and metal nitrides for eliminating nitrogen oxides in exhaust gas in the presence of oxygen in excess of the stoichiometric quantity of oxidizing components for reducing components. The catalyst is effective for eliminating NO.sub.x in exhaust gas from lean burn engines such as lean burn gasoline engines and diesel engines containing excess O.sub.2 corresponding to an A/F ratio of 17 or over.

Abstract: This invention relates to a catalyst for cleaning exhaust gas, which is prepared by dipping in hydrofluoric acid an amorphous alloy composed of 20 to 80 atom % of one or more elements selected from the group consisting of Nb, Ta, Ti and Zr (the sum of Nb and Ta being up to 70 atom %), 0.5 to 20 atom % of one or more elements selected from the group consisting of Ru, Pd, Rh, Pt and Ir, and the balance of one or two of Ni and Co. This catalyst can clean at a low temperature an exhaust gas containing NO or CO discharged from apparatuses or engines wherein various organic substances are burnt.

Abstract: A method of manufacturing hard pelleted activated carbon is disclosed in which pellets are first formed by agglomeration in a pin mixer followed by pelleting the plasticized acid char (without the use of additional binders), and then activating the carbon pellets to yield a product with high density and activity.

Abstract: A process for regenerating deactivated metal oxide catalysts comprising at least one of the elements antimony, iron, bismuth, molybdenum, vanadium, tungsten and/or uranium and a peptizable carrier, comprises the steps of:a) grinding the metal oxide catalyst in the presence of water to a particle size of from 10 nm to 10 .mu.m,b) heating the aqueous suspension of the metal oxide catalyst of stage a) to 30-100.degree. C. and adding an acid which peptizes the carrier,c) spray drying the acidic suspension of the metal oxide catalyst,d) heating the fluidizable metal oxide catalyst particles of stage c) to 500.degree.-850.degree. C.

Abstract: A catalyst, e.g., a cracking catalyst, and a part of the regeneration fumes are drawn off from the dense catalytic bed of a second regenerator (9) and are introduced by force of gravity into an external exchanger (21) at a junction point beneath the level of the dense bed of the second regenerator. The heat exchange takes place in the bottom part of the exchanger below the junction point. Between the bottom end of the exchanger and the region above the junction point a dense bed zone is formed at a level which is substantially at the height of the dense bed in the regenerator and a discharge zone (27), of suitable size, for the regeneration gases and fluidization gas. The gases and fumes from the exchanger are removed in the diluted fluidized phase from the second regenerator through a conduit (28), while the catalyst is recycled in to the bed of the first regenerator through a conduit (34).

Abstract: Perovskite materials have a composition of the formula La.sub.1-x Sr.sub.x Cr.sub.1-y Ru.sub.y O.sub.3 wherein 0.1.ltoreq.x.ltoreq.0.5 and 0.01.ltoreq.y.ltoreq.0.10. The materials are used in catalysts for carbon monoxide oxidation, unsaturated hydrocarbon oxidation and/or nitrogen oxide reduction.

Abstract: An HCl adsorbent, and method of making and using the adsorbent, the adsorbent comprising an activated alumina promoted with an alkali metal in an amount such that if calculated as alkali metal oxide, the adsorbent contains at least about 5% by weight alkali metal oxide.

Abstract: In a dehydrogenation process wherein catalyst is regenerated off-stream by use of heated air, at least two reactors are in the regeneration cycle, with regeneration air being heated to regeneration catalyst temperature for introduction into the first reactor, and thereafter being reheated to catalyst regeneration temperature and introduced into the second reactor. Such air may also be employed for preheating feed to the dehydrogenation reactor and/or for steam generation by heating such air to the temperature required for such procedure.

Abstract: A novel process and chemicals are disclosed for the rejuvenation of oxidation catalysts used to reduce the production of pollutants in the exhaust gas emanating from an internal combustion engine, particularly catalysts used in the converters of automobiles and other combustion engine powered vehicles. The rejuvenation may be done in place, within minutes, without removing the holding containers or converters or the catalyst from them. The rejuvenation is effected by treating the used catalyst with an aqueous solution of a peroxide which is decomposable at the temperature of treatment. The concentration of solution, the proportion of solution per unit volume of catalyst and the time of treatment are important factors in the effectiveness in regenerating or rejuvenating the catalyst.

Abstract: Catalytic composites of the reaction product of a metal halide having Friedel-Crafts activity with the bound surface hydroxyl group of inorganic oxides and containing a zerovalent metal with hydrogenation activity, often are effective catalysts in motor fuel alkylation which, however, undergo rapid deactivation. Deactivated catalysts are readily regenerable by treating the composite from which alkylate feedstock has been removed with hydrogen at temperatures in the range of 10 to 300.degree. C. Multiple regenerations are possible without appreciable activity loss.

Abstract: A method of treating spent selective catalytic reduction (SCR) catalyst is provided, which method comprises contacting the spent catalyst with a solution comprising a SCR catalyst metal salt, preferably a vanadium salt, and heating the catalyst contacted with the metal salt solution at a calcination temperature in the presence of oxygen. Preferably, after treatment with the metal salt solution, the catalyst is dried with air for at least about 10 seconds and heated to a temperature in the range of about 130.degree. F. to about 170.degree. F. for a period of about 30 minutes to about 90 minutes before heating to the calcination temperature.

Abstract: A method of producing crack-free green activated carbon structures using a carbon matrix containing high gel strength binders such as methyl cellulose binders is disclosed. The invention also relates to a method of drying activated carbon structures by first contacting the structure with microwave radiation and then drying the structure in a conventional oven.

Abstract: A crystalline silicate catalyst having deposited coke thereon is regenerated by being contacted with an oxygen-containing gas having a moisture content of 0.2% by volume or less at a temperature of 400.degree.-600.degree. C.

Abstract: A process is disclosed for regenerating a spent liquid acid catalyst comprising the steps of:(a) providing a spent liquid acid catalyst comprising HF, sulfolane, and conjunct polymeric byproducts formed during the HF-catalyzed reaction of isoparaffin and olefin to form isoparafinnic alkylate;(b) providing a finely divided solid sorbent, wherein said solid sorbent preferentially and reversibly sorbs said conjunct polymeric byproducts from a mixture containing HF, sulfolane;(c) mixing said spent liquid acid catalyst of step (a) with said solid sorbent of step (b) by charging said spent liquid acid catalyst to the driving fluid inlet of an eductor and drawing a stream containing said solid sorbent into said eductor;(d) holding said mixture of step (c) in contact for time sufficient for said solid sorbent to preferentially sorb at least a portion of said conjunct polymeric byproducts from said spent liquid acid catalyst to produce a conjunct polymer-enriched sorbent and to regenerate said liquid acid catalyst; an

Abstract: Lignocellulosic carbonaceous material is activated to produce a high activity, high density gas-phase activated carbon under conditions which effectively alter the particle pore volume size distribution to optimize the carbon's mesoporosity. A novel process is disclosed for producing the carbon.

Abstract: A process is described for preparing attrition resistant catalyst, particularly vanadium/phosphorus oxide catalyst, having an oxide rich surface layer. The oxide rich surface layer is obtained from a stable oxide-forming mixture which contains both colloidal oxide sol and a soluble oxide precursor.

Abstract: This invention describes a process for regeneration of halocarbon bearing carbonaceous adsorbents through which a carbonaceous adsorbent is contacted with hydrocarbon gases, preferably propane, butane and pentane at near room temperatures and at atmospheric pressure. As the hydrocarbon gases come in contact with the adsorbent, the hydrocarbons displace the halocarbons by physical adsorption. As a result of using this process, the halocarbon concentration and the hydrocarbon eluant is increased thereby allowing for an easier recovery of pure halocarbons. By using the process of this invention, carbonaceous adsorbents can be regenerated by an inexpensive process which also allows for subsequent re-use of the recovered halocarbons.

Abstract: A carbon dioxide consuming material and a method for manufacturing it from waste released in the building industry, including: a primary crushing step 5 for crushing concrete fragments 1 under a pressure; a secondary crushing step 7 for crushing or smashing primary-crushed concrete fragments 11 from the primary crushing step by utilizing a grinding motion in a highly dense and pressurized condition; and a screening and separating step 8 for mixture of products obtained by the secondary crushing step.

Abstract: A stable, metallic hydride composition and a process for making such a composition. The composition comprises a uniformly blended mixture of a metal hydride, kieselguhr, and a ballast metal, all in the form of particles. The composition is made by subjecting a metal hydride to one or more hydrogen absorption/desorption cycles to disintegrate the hydride particles to less than approximately 100 microns in size. The particles are partly oxidized, then blended with the ballast metal and the kieselguhr to form a uniform mixture. The mixture is compressed into pellets and calcined. Preferably, the mixture includes approximately 10 vol. % or more kieselguhr and approximately 50 vol. % or more ballast. Metal hydrides that can be used in the composition include Zr, Ti, V, Nb, Pd, as well as binary, tertiary, and more complex alloys of La, Al, Cu, Ti, Co, Ni, Fe, Zr, Mg, Ca, Mn, and mixtures and other combinations thereof. Ballast metals include Al, Cu and Ni.

Abstract: An electrocatalytic cathode that will allow hydrogen peroxide, H.sub.2 O..2, to behave electrochemically within an Al-H.sub.2 O.sub.2 battery system is provided. The electrocatalytic cathode is comprised of nickel specially coated with one or a combination of the following six metals: platinum, ruthenium, rhodium, osmium, palladium, and iridium. The use of nickel coated with the appropriate combination of metals reduces the problems of excessive peroxide decomposition, thereby producing a battery that can operate efficiently by producing a high voltage at a high current density. The electrocatalytic cathode is produced by pretreating a nickel electrode with a hydrochloric acid bath and then by applying the metal coating by plating methods.