Patent ID: 9314772
Filing Date: 2016-04-19
CPC Classification: B01J

Claim Text:
1. A heteropoly acid salt catalyst having the following general formula: wherein D represents at least one element selected from the group consisting of copper, magnesium, manganese, stibium and zinc; E represents at least one element selected from the group consisting of tungsten, silicon, nickel, palladium, ferrum and plumbum; Z is a carrier/diluting thermal-conductive agent, which is one selected from the group consisting of SiC, MoO the weight ratio y/x=15-50:100; a=0.1-3; b=0.01-5; c=0.01-5; d=0.01-3; e=0.01-2; and f is the atom ratio of oxygen balancing the valence for each component described above, wherein the catalyst is prepared by the following procedures: (i) dissolving molybdenum, phosphorus, and vanadium compounds in a solvent to formulate Solution A; dissolving potassium compound and a D-containing compound in a solvent to formulate Solution B; and dissolving an E-containing compound in a solvent to formulate Solution C; (ii) mixing Solutions A, B and C under a temperature of −5-10° C.; (iii) pre-calcinating under an oxygen-containing gas flow to obtain a catalyst precursor; (iv) adding into the catalyst precursor 1-5 wt % of graphite powder and a diluting thermal-conductive agent, wherein the weight ratio between the diluting thermal-conductive agent and the catalyst precursor (y/x) is 15-50:100; and (v) calcinating in an oxygen-containing atmosphere.