Engelhard Minerals & Chemicals Corporation

Givaudan Corporation

Leon M Polinski

Saul G Hindin

George W Roberts

I-Der Huang

Krishna K Rao

James L Kosco

William C Carr

A catalyst system capable of operating at very high temperatures is disclosed. The catalyst is divided into upstream and downstream portions, the upstream portion being protected against both thermal conductivity and radiant heat transfer from the downstream portion. Advantageously, the upstream portion may use a more active catalyst composition then the downstream portion.

Catalyst system

Catalysts having good high temperature stability which are particularly useful for carrying out high temperature reactions, such as combustion reactions at temperatures of the order of 1000.degree.-1400.degree. C., are disclosed. The catalytically active materials include precious metals, base metals or their oxides, or precious metals in combinstion with base metals, deposited on a catalyst slip or composite which contains alumina in admixture with a metal oxide component. The metal oxide component consists of a mixture of strontia or barium oxide with either molybdenum trioxide, zirconia, silica, or stannous oxide, or of a mixture of lanthana with either silica or stannous oxide. The slips or carrier compositions are calcined at a temperature of at least 500.degree. C. before deposition of the precious metal or base metal material, and are characterized by having a surface area of at least 20 m.sup.2 /g after calcination at a temperature of 1200.degree. C. for 4 hours.

High temperature-stable catalyst composition

Monohydric primary or secondary saturated and unsaturated alcohols are oxidatively dehydrogenated to the corresponding aldehyde or ketone over a gold catalyst at temperatures between 280.degree.-600.degree. C. in the presence of oxygen.

Oxidative dehydrogenation of alcohols to aldehydes and ketones

Disclosure is made of an improved catalyst and process for producing a near equilibrium mixture of xylenes from a feedstream comprising ethylbenzene and mixed xylenes. The catalyst combines a platinum-containing hydrogenation-dehydrogenation component on an alumina support with a form of hydrogen mordenite having less than about 0.3 equivalents of alkali and alkaline earth metal cations per gram-atom of aluminum and a silica to alumina mol ratio greater than about 9-11 to 1 and less than about 17 to 1.

Alkyl aromatic isomerization

A catalyst system capable of operating at very high temperatures is disclosed. The catalyst is divided into upstream and downstream portions, the upstream portion being protected against both thermal conduction and radiant heat transfer from the downstream portion. Advantageously, the upstream portion may use a more active catalyst composition than the downstream portion.

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North Plainfield, NJ, United States of America

Leon M Polinski