Novel high surface area oxide compositions with a pyrochlore str

Details Novel high surface area oxide compositions with a pyrochlore str Novel high surface area oxide compositions with a pyrochlore str

1989-06-26

1991-05-14

Straub, Gary P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

502324, 502340, 502349, 502353, C01G 3300, C01G 3500

Patent

active

050154613

ABSTRACT:
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.

REFERENCES:
patent: 4678505 (1987-07-01), Bushey
"Crystal Chemistry of Pyrochlores", Jr. Amer. Ceramic Soc., vol. 45, No 1, 1962, by Aleshin, et al. pp. 18-25.

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