Patent ID: 8642495

Claim:
A catalyst which comprises a metal oxycarbonitride containing niobium and at least one metal (hereinafter the “metal M” or “M”) selected from the group consisting of tin, indium, platinum, tantalum, zirconium, copper, iron, tungsten, chromium, molybdenum, hafnium, titanium, vanadium, cobalt, manganese, cerium, mercury, plutonium, gold, silver, iridium, palladium, yttrium, ruthenium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and nickel, wherein the metal oxycarbonitride has a compositional formula represented by Nb a M b C x N y O z wherein a, b, x, y and z represent a ratio of the numbers of the atoms, 0.01≦a<1, 0<b≦0.99, 0.01≦x≦2, 0.01≦y≦2, 0.01≦z≦3, a+b=1, and x+y+z≦5.