Abstract: A method of using photoactive semiconductors to reduce atmosphere chlorofluorocarbons by dispersing photoactive semiconductor particles, namely titanium dioxide, zinc oxide or zinc sulfide into the stratosphere, activating the particles through exposure to ambient light, accumulating chlorofluorocarbons by chemisorption into the semiconductor, precipitating the reacted particles from the stratosphere and hydrolyzing the chlorofluorocarbon moiety into involatile components.

Abstract: Oligomers produced from lower olefins or alkenes by acidic zeolite catalyzed oligomerization can be converted to useful lubricant additives or lubricants by hydroxylation of olefinic bonds in the oligomers, whereby oligomers containing 1,2-glycol groups are produced. It has also been discovered that these glycols can be esterified to provide oligomers that also exhibit useful properties as lube additives or lubricants. The discovery is particularly applicable to the hydroxylation and esterification of oligomers produced from lower olefins such as propylene by oligomerization using ZSM-5 catalyst which has been surface deactivated.

Abstract: A solid catalyst composition which has undergone a partial loss of catalytic activity due to the accumulation of reaction product residue is treated in a chemical conversion process reaction zone in the presence of feedstock(s) with ultrasonic energy of a magnitude and a duration sufficient to restore at least a significant percentage of the lost activity.

Abstract: A solid catalyst composition which has undergone a partial loss of catalytic activity due to the accumulation of reaction product residue is treated in a chemical conversion process reaction zone in the presence of feedstock(s) with ultrasonic energy of a magnitude and a duration sufficient to restore at least a significant percentage of the lost activity.

Abstract: A process selective for converting dimethylhexanes to aromatic analogs is described. Application of the exhibited selectivity of the process allows upgrading alkylate dimethylhexane(s) of low RON to produce higher RON analogs without affecting changes in other components of the alkylate. The catalysts preferred comprise platinum and non-acidic supports such as [Sn]ZSM-5 and [In]ZSM-5.

Abstract: A process for converting a C.sub.1 -C.sub.12 non-aromatic hydrocarbon feed to aromatics by contacting the feed with a zinc-containing medium pore size zeolite catalyst in a conversion zone, comprising adding at least one non-metal oxide or sulfide to the feed in an amount effective to prevent elution of zinc from the zinc-containing zeolite catalyst.

Abstract: A modified ZSM-5 type zeolite is provided by treatment of a ZSM-5 type zeolite with BF.sub.3. The novel product is characterized by reduced pore size and enhanced shape-selectivity, or by enhanced activity, or by both. This invention also provides a process for catalytically converting organic compounds by use of the novel composition, an illustrative conversion being the catalytic conversion of methanol to hydrocarbons and C.sub.2 -C.sub.7 olefins to gasoline components.

Abstract: A process is provided for converting feedstock aromatic compounds by alkylation, transalkylation, disproportionation and/or isomerization over a catalyst comprising zeolite ZSM-58.

Abstract: A modified ZSM-5 type zeolite is provided by treatment of a ZSM-5 type zeolite with BF.sub.3. The novel product is characterized by reduced pore size and enhanced shape-selectivity, or by enhanced activity, or by both. This invention also provides a process for catalytically converting organic compounds by use of the novel composition, an illustrative conversion being the catalytic conversion of methanol to hydrocarbons.

Abstract: A process is provided for converting feedstock comprising oxygenates to product comprising hydrocarbons over a catalyst comprising zeolite ZSM-58.

Abstract: A modified ZSM-5 type zeolite is provided by treatment of a ZSM-5 type zeolite with BF.sub.3. The novel product is characterized by reduced pore size and enhanced shape-selectivity, or by enhanced activity, or by both. This invention also provides a process for catalytically converting organic compounds by use of the novel composition, an illustrative conversion being the catalytic conversion of methanol to hydrocarbons.

Abstract: A process is provided for converting feedstock comprising C.sub.2.sup.+ olefins, C.sub.2 -C.sub.7 paraffins or mixtures thereof to product comprising C.sub.5.sup.+ hydrocarbons over a catalyst comprising zeolite ZSM-58.

Abstract: A modified ZSM-5 type zeolite is provided by treatment of a ZSM-5 type zeolite with BF.sub.3. The novel product is characterized by reduced pore size and enhanced shape-selectivity, or by enhanced activity, or by both. This invention also provides a process for catalytically converting organic compounds by use of the novel composition, an illustrative conversion being the catalytic conversion of methanol to hydrocarbons.

Abstract: In the process of converting an aromatic feedstock to an alkyl-substituted mono-nuclear aromatic product by contacting the feedstock with a coke-selectivated ZSM-5 type catalyst at elevated temperature under conversion process coking conditions to produce said alkyl-1-substituted mononuclear aromatic product selectively, the improvement which comprises:regenerating the process coked catalyst in contact with a non-oxidizing atmosphere comprising an effective amount of hydrogen at a temperature of about 800.degree. F. to 1200.degree. F. to restore activity of the catalyst while retaining selectivity. Advantageously, the conversion involves alkylation, disproportionation and/or isomerization to produce at least one lower alkyl or dialkyl benzene product.

Abstract: The present invention relates to a new method for preparing a composition comprised of a crystalline zeolite having deposited thereon a coating of silica which extensively covers and resides substantially exclusively on the external surface thereof, and to the composition so prepared.

Abstract: The present invention relates to selective conversion of certain hydrocarbon feedstocks to product rich in para-dialkyl substituent benzenes over a catalyst composition comprising a crystalline zeolite having deposited thereon a coating of silica which extensively covers and resides substantially exclusively on the external surface thereof.

Abstract: Disclosed is a zeolite base catalyst useful particularly for the selective production of para-dialkylsubstituted benzene. The catalyst comprises a porous crystalline zeolite having silica deposited thereon and having incorporated therein phosphorous. Described also in the process for making the catalyst and the parameters for the use of the catalyst in dialkylation processes.

Abstract: An improved method is provided for the production of silica-modified zeolite catalysts. Such catalysts are especially useful in a wide variety of processes including the conversion of methanol to gasoline, methanol to olefins, selective toluene disproportionation, toluene alkylation with methanol, the synthesis of p-ethyl toluene, lubricant hydro-dewaxing and the like. The catalysts formed in accordance with the present invention comprise crystalline aluminosilicate zeolites having a silica to alumina ratio of at least about 12, a constraint index, as hereinafter defined, within an approximate range of 1-12 and having contained within the interior crystalline structure thereof added amorphous silica in an amount of at least about 0.3% and preferably between about 0.5% and about 30 weight percent. The resultant catalyst is characterized by an n-hexane sorption capacity at a temperature of 90.degree. C. and an n-hexane partial pressure of 83 mm.

Abstract: Disclosed is a zeolite base catalyst useful particularly for the selective production of para-dialkylsubstituted benzene. The catalyst comprises a porous crystalline zeolite having silica deposited thereon and having incorporated therein phosphorous. Described also in the process for making the catalyst and the parameters for the use of the catalyst in dialkylation processes.

Abstract: A process for the manufacture of high quality lubricating oils having a high viscosity index and low pour point is disclosed which comprises catalytically dewaxing a lubricating oil stock by contacting the same in the presence of hydrogen over a zeolite such as ZSM-5 which has been silica-modified.