Abstract: Disproportionation of toluene with high conversion thereof to produce benzene and xylenes rich in the para isomer is accomplished by subjecting toluene to disproportionation conditions in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, which catalyst has undergone prior modification by treatment with an ammonium hydrogen phosphate to deposit at least about 0.5 weight percent of phosphorus thereon.

Abstract: Process for manufacturing a catalyst for hydrocarbon conversion consisting of a mordenite containing less than 0.5% by weight ofsodium, having a molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 from 10 to 100 and further containing at least one metal selected from cobalt, nickel, silver and palladium, wherein said metal in incorporated to a mordenite of the sodic form having a molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 close to 10, the major portion of the sodium is eliminated, the resulting catalyst mass is dried from about 50.degree. to 150.degree. C. and then subjected to a first so-called dry calcination between 300.degree. and 700.degree. C., in the presence of a dry, inert or oxidizing gas containing less than 1% by volume of steam, and to a second so-called wet calcination between 250.degree. and 700.degree. C., in the presence of either steam or an inert or oxidizing gas containing at least 3% of steam.

Abstract: Fractionated heavy reformate containing ethyltoluenes and propylbenzenes is selectively hydrodealkylated and transalkylated to produce ethylbenzene-lean xylenes, benzene and C.sub.2 -C.sub.4 paraffins in the presence of a catalyst comprising a tungsten/molybdenum component of WO.sub.3 and MoO.sub.3 and an acidic component of 60 (wt)% of mordenite and 40 (wt)% of catalytically active alumina.

Abstract: Process for disproportionation of petroleum hydrocarbons which comprises containing in a reaction zone said petroleum hydrocarbon under suitable disproportionation conditions with a catalytic composition comprising a tungsten/molybdenum component, said tungsten/molybdenum component deposited upon an acidic cracking component comprising a mordenite large pore crystalline aluminosilicate material and a refractory inorganic oxide.

Abstract: A method of preparing benzene and xylenes from catalysates of reforming of gasoline fractions comprising a mixture of aromatic C.sub.6 -C.sub.10 hydrocarbons and non-aromatic hydrocarbons which involves separation of a low-boiling fraction boiling out at a temperature of 90.degree.-108.degree. C. from a reforming catalysate by rectification. The remaining high-boiling fraction is processed in the presence of a hydrogen-containing gas at a temperature within the range of from 450.degree. to 600.degree. C. under a pressure of from 10 to 60 atm on a catalyst. The catalyst consists of 1 to 85% by weight of H-mordenite, 0.1 to 10% by weight of a hydrogenating component as which use might be made of oxides of metals of Group VI of the periodic system, sulphides of these metals, metals of Group VIII of the periodic system, sulphides thereof; the balance being a binder.

Abstract: Disproportionation of toluene to produce benzene and xylenes rich in the para isomer is accomplished by subjecting toluene to disproportionation conditions in the presence of a catalyst comprising the crystalline aluminosilicate zeolite ZSM-23.

Abstract: Crystalline aluminosilicate zeolites are used as catalysts for various hydrocarbon conversion processes and are particularly useful for conversion of paraffins in the presence of an alkylatable aromatic hydrocarbon such as benzene.