Exxon Research and Engineering Company

Joseph T Lewandowski

Harold S Horowitz

John M Longo

Allan J Jacobson

Richard B Hall

Charles A Mims

Jack Wayne Johnson

Processes for the conversion of hydrocarbons, and most preferably methane, to higher hydrocarbons and olefins are disclosed, including contacting the hydrocarbons with a mixed metal oxide catalyst having the pyrochlore structure. Preferably, these catalysts have the general formula A.sub.n B.sub.2 O.sub.7-x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, 0.ltoreq.n.ltoreq.2.0, and 0.ltoreq.x.ltoreq.1.0. Novel, high surface area, mixed metal oxide catalysts having the pyrochlore structure are also disclosed, including those having the formula A.sub.2 B.sub.2 O.sub.7, where A is divalent and B is niobium and/or tantalum, and those having the formula A.sub.2 (Sn.sub.2-y A.sub.y)O.sub.7-z, where A is bismuth and/or lead, 0.0.ltoreq.y.ltoreq.1.0, and 0.0.ltoreq.z.ltoreq.1.0.

High surface area oxide compositions with a pyrochlore structure,

Processes for the conversion of hydrocarbons, and most preferably methane, to higher hydrocarbons and olefins are disclosed, including contacting the hydrocarbons with a mixed metal oxide catalyst having the pyrochlore structure. Preferably, these catalysts have the general formula A.sub.n B.sub.2 O.sub.7 -x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, 0.ltoreq.n.ltoreq.2.0, and 0.ltoreq.x.ltoreq.1.0. Novel, high surface area, mixed metal oxide cataysts having the pyrochlore structure are also disclosed, including those having the formula A.sub.2 B.sub.2 O.sub.7, where A is divalent and B is niobium and/or tantalum, and those having the formula A.sub.2 (Sn.sub.2-y A.sub.y)O.sub.7-z, where A is bismuth and/or lead, 0.0.ltoreq.y.ltoreq.1.0, and 0.0.ltoreq.z.ltoreq.1.0.

Novel high surface area oxide compositions with a pyrochlore structure,

Disclosed are a class of compositions, and methods of preparing them, which compositions are comprised of inorganic oxides and organic bases. The compositions have layered structures and are represented by the formula

Layered compounds of perovskite related oxides and organic bases

A method of preparing electrically conductive pyrochlore compounds of high surface area and unagglomerated form, having the formula

Method of synthesizing high surface area unagglomerated noble metal

A method of preparing electrically conductive pyrochlore compounds having the formula:

Method of making lead and bismuth pyrochlore compounds using an alkaline

A liquid solution method of preparing electrically conductive pyrochlore compounds having the formula:

Method of making lead and bismuth ruthenate and iridate pyrochlore

A liquid solution method of preparing electrically conductive pyrochlore compounds of high surface area, having the formula:

Method of making lead-rich and bismuth-rich pyrochlore compounds using

Method of making stoichiometric lead and bismuth pyrochlore compounds

Novel bismuth-rich pyrochlore-type compounds are described having the formula:

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Middlesex, NJ, United States of America

Joseph T Lewandowski