| 主权项 |
1. A catalytic composition comprising a complex of metal oxides wherein the relative ratios of the listed elements in said catalytic composition are represented by the following formula:
MomBiaFebAcDdEeFfGgCehOx wherein
A is at least one element selected from the group consisting of sodium, potassium, rubidium and cesium; andD is at least one element selected from the group consisting of nickel, cobalt, manganese, zinc, magnesium, calcium, strontium, cadmium and barium;E is at least one element selected from the group consisting of chromium, tungsten, boron, aluminum, gallium, indium, phosphorus, arsenic, antimony, vanadium and tellurium;F is at least one element selected from the group consisting of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium thulium, ytterbium, lutetium, scandium, yttrium, titanium, zirconium, hafnium, niobium, tantalum, aluminum, gallium, indium, thallium, silicon, germanium and less than about 10 ppm lead;G is at least one element selected from the group consisting of silver, gold, ruthenium, rhodium, palladium, osmium, iridium, platinum and mercury; and a, b, c, d, e, f, g, h, and x are, respectively, the atomic ratios of bismuth (Bi), iron (Fe), A, D, E, F, G, cerium (Ce) and oxygen (O), relative to “m” atoms of molybdenum (Mo), wherein
a is from 0.05 to 7,b is from 0.1 to 7,c is from 0.01 to 5,d is from 0.1 to 12,e is from 0 to 5,f is from 0 to 5,g is from 0 to 0.2,h is from 0.01 to 5,m is from 10 to 15, andx is the number of oxygen atoms required to satisfy the valence requirements of the other component elements present; wherein 0.5≦a/h<1.5 and 0.3≦(a+h)/d≦1 and 0.8≦h/b≦5. |
