초록 ▼

Catalytic compositions and processes are disclosed for economical conversions of lower alkane hydrocarbons. Broadly, the present invention discloses solid compositions containing mixed metal oxides that exhibit catalytic activity for ammoxidation of lower alkane hydrocarbons to produce an unsaturate

Catalytic compositions and processes are disclosed for economical conversions of lower alkane hydrocarbons. Broadly, the present invention discloses solid compositions containing mixed metal oxides that exhibit catalytic activity for ammoxidation of lower alkane hydrocarbons to produce an unsaturated nitrile in high yield. Generally, these solid oxide compositions comprise, as component elements, molybdenum (Mo), vanadium (V) niobium (Nb) and at least one active element selected from the group consisting of the elements having the ability to form positive ions. Mixed metal oxide catalytic compositions advantageously comprise one or more crystalline phases at least one of which phases has pre-determined unit cell volume and aspect ratio. Also described are methods for forming the improved catalysts having the desired crystalline structure and ammoxidation processes for conversion of lower alkanes.

대표청구항 ▼

1. A solid composition that exhibits catalytic activity for ammoxidation or oxidation of propane and iso-butane in the gaseous phase, which comprises one or more crystalline phases at least one of which is a first phase characterized as having the M1 crystalline structure, wherein said first phase h

1. A solid composition that exhibits catalytic activity for ammoxidation or oxidation of propane and iso-butane in the gaseous phase, which comprises one or more crystalline phases at least one of which is a first phase characterized as having the M1 crystalline structure, wherein said first phase has a unit cell volume in a range upward from 2250 A3 to about 2350 A3, a first crystallite dimension and a transverse thereto a second dimension with the proviso that the ratio of first to second dimensions is in a range downward from about 2.5 to about 0.7; and wherein at least a portion of the composition is formed under conditions of crystallization by combining sources of metal ions in amounts consistent with a nominal mixed oxide material represented by the empirical formula: MoVaSbbNbcOδ Where 0.1