| 摘要 |
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 AnB2O7-x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, O </= n </=2.0, and O </= x </= 1.0. Novel, high surface area, mixed metal oxide catalysts having the pyrochlore structure are also disclosed, including those having the formula A2B2O7, where A is divalent and B is niobium and/or tantalum, and those having the formula A2(Sn2-yAy)O7-z, where A is bismuth and/or lead, O.O </= y </= 1.0,and O.O </= z </= 1.0. |
