US 6,982,343 B2 | ||
Treatment of mixed metal oxide catalyst | ||
Sanjay Chaturvedi, Horsham, Pa. (US); Anne Mae Gaffney, West Chester, Pa. (US); and Dominique Hung Nhu Le, Upper Darby, Pa. (US) | ||
Assigned to Rohm and Haas Company, Philadelphia, Pa. (US) | ||
Filed on Oct. 17, 2002, as Appl. No. 10/272,893. | ||
Claims priority of provisional application 60/339408, filed on Oct. 26, 2001. | ||
Prior Publication US 2003/0135064 A1, Jul. 17, 2003 | ||
Int. Cl. C07C 253/00 (2006.01); C07C 51/16 (2006.01); B01J 23/00 (2006.01) |
U.S. Cl. 558—323 | 5 Claims |
1. A process for improving the performance characteristics of a catalyst, comprising the steps of:
a) providing precursors for a mixed metal oxide having the empirical formula
AaDbEcXdOe,
wherein A is at least one element selected from the group consisting of Mo and W, D is at least one element selected from
the group consisting of V and Ce, E is at least one element selected from the group consisting of Te, Sb and Se, and X is
at least one element selected from the group consisting of Nb, Ta, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pt, Sb, Bi, B,
In, As, Ge, Sn, Li, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Ba, Ra, Hf, Ag, Pb, P, Pm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; and a=1,
b=0.01 to 1.0, c=0.01 to 1.0, d=0.01 to 1.0, and e is dependent on the oxidation state of said other elements;
b) calcining an admixture of said precursors; and
c) contacting, no earlier than during said calcining step (b), said precursors with a treatment agent selected from the group
consisting of hydrogen, a gaseous source of NOx and mixtures thereof.
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