Princeton University

Other

Pcp Consulting and Research, Inc.

Sankaran Sundaresan

Jay B Benziger

Partha S Ganguli

V Vance Guliants

Vadim Guliants

The composition of matter, vanadyl phosphite, useful as a precursor to a vanadium/phosphorous oxide oxidation catalyst used in the selective oxidation of n-butane to produce maleic anhydride.

Vanadyl pyrophosphate precursors

The invention relates to vanadium/phosphorus oxide catalyst precursors useful in preparing catalysts useful in the oxidation of hydrocarbons containing 4 carbon atoms to maleic anhydride.

Catalytic process for the production of maleic anhydride

A vanadium/phosphorus oxide oxidation catalyst suitable for catalytic oxidation of C.sub.4 feed stock in the preparation of maleic anhydride is formed by calcining an intercalation complex of the formula VOHPO.sub.4 .multidot.0.5H.sub.2 O.multidot.({C.sub.n H.sub.2n+1 }--X).sub.z in which n has a value of from 0 to 20, z has a value of from about 1.5 to about 1.9; and X is an oxygen- or nitrogen-containing functional group operable to form hydrogen bonds with the structural P--OH and water groups of the complex.

Vanadium/phosphorus oxide oxidation catalyst

Three-way precious metal catalysts useful for conversion treatment of pollutants in fuel combustion gases from automotive exhausts, or gas emissions from stationary fuel combustion sources, have chemical activity and thermal stability of the catalysts appreciably enhanced by utilizing a composite oxygen-ion conducting support material. Such composite supports are composed of zirconia stabilized by yttria, calcia, magnesia or scandia, and at least 40 wt. % inert support material such as alumina or titania, and have surface area of 20-300 m.sup.2 /gm. The catalysts can be supported by composites of yttria-stabilized-zirconia (YSZ) and alumina, and contain 0.01-3.0 wt % total active metals, which may consist of major metals platinum or palladium and minor metals rhodium or ruthenium dispersed on the support. Such three-way catalysts are thermally stable, achieve a high level of pollutants (CO, NO.sub.x, H.sub.2 and hydrocarbons) removal, and have long catalyst life without requiring undesirably high loading of expensive precious active metals on the catalyst support material.

Precious metal catalysts utilizing composites of oxygen-ion conducting

Three-way catalysts used for treatment of automobile exhaust gas or gas emissions from stationary combustion sources, which typically have consisted of platinum and rhodium and sometimes palladium and rhodium dispersed on an .gamma.-alumina support, can have the activities of the active metals in the catalysts appreciably enhanced by using an oxygen-ion conducting material such as yttria-stabilized-zirconia (YSZ) as the support material. Support material surface area is 20-300 m.sup.2 /gm, and useful concentrations of yttria on zirconia support are 1.0-50 wt. %. Useful concentrations of platinum or palladium on the support material is 0.01-2 wt. %, and the weight ratio of rhodium/platinum or rhodium/palladium is 0.01-0.1. YSZ-supported catalysts can achieve a substantially higher level of pollutants (CO, NO.sub.X, H.sub.2 and hydrocarbons) removal, without requiring increased loading of expensive precious active metals on the support material.

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Mercerville, NJ, United States of America

Sankaran Sundaresan