Patent ID: 8114805
Filing Date: 2012-02-14
Classification: B01J

Abstract:
1. A method of preparing a heteropoly acid catalyst comprising the following steps: (A) preparing a slurry by adding i) one or more materials selected from the group consisting of precursors of Bi, As, Zr, Ge, Tl, Si, B, Te, Sb and Ta (referred as “X” hereinafter), ii) one or more materials selected from the group consisting of precursors of Ti, W, Fe, Cu, Zn, Cr, Co, Ni, Mn, Ga, Ce and La (referred as “Y” hereinafter), iii) one or more materials selected from the group consisting of precursors of K, Rb, Na, Cs, Mg and Ba (referred as “Z” hereinafter), and iv) ammonium salt to protonic acid Keggin-type heteropoly acid aqueous solution and stirring thereof; wherein the X, Y, and Z precursors and the ammonium salt are added as precursor aqueous solutions, wherein precursor aqueous solutions maintaining the slurry at suspension phase are added first and a precursor aqueous solution that generates a precipitate is added only after addition of precursor aqueous solutions maintaining the slurry at suspension phase, and wherein the ammonium salt is added finally; and (B) drying, molding and firing the slurry to give a heteropoly acid catalyst.