초록

Alkanes are converted to unsaturated carboxylic acids by contacting an alkane with an oxidizing agent and a heteropolyacid supported on wide pore polyoxometallate salts.

대표청구항 ▼

[ What is claimed is:] [1.] A process of preparing a porous cesium polyoxometallate, having the formula Cs.sub.a H.sub.(e-a) (X.sub.k M.sub.m-x M'.sub.x M".sub.n O.sub.y).sup.-e, where X is a Group IIIB, IVB, VB, VIB or transition metal; M is molybdenum or tungsten or combinations thereof; M' is van

[ What is claimed is:] [1.] A process of preparing a porous cesium polyoxometallate, having the formula Cs.sub.a H.sub.(e-a) (X.sub.k M.sub.m-x M'.sub.x M".sub.n O.sub.y).sup.-e, where X is a Group IIIB, IVB, VB, VIB or transition metal; M is molybdenum or tungsten or combinations thereof; M' is vanadium; M" is independently zinc or a transition metal different from M and M', or combination thereof; a is the number of cesium cations; e is the charge of anion (X.sub.k M.sub.m-x M'.sub.x M".sub.n O.sub.y); k is 1 to 5, m is 5 to 17, x is 0 to 3; n is 0 to 3 and y is 18 to 62; and having pore volumes in the range from 0.01 to 0.25 ml/g and a pore size distribution such that over approximately 60% of said pores have radii greater than approximately 75 .ANG.; said process comprising steps of:(a) mixing a solution of cesium salt with a concentration in the range of approximately 0.05 to 1 mole/liter with a solution of heteropolyacid with the formula H.sub.e (X.sub.k M.sub.12-x M'.sub.x M".sub.n O.sub.40).sup.-e with a concentration in the range of approximately 0.05 to 1 mole/liter at a rate in the range of approximately 0.5 to 20 ml/minute;(b) precipitating said polyoxometallate at a temperature in the range from approximately 25 to 100.degree. C. to yield a slurry comprising polyoxometallate precipitate;(c) drying said polyoxometallate precipitate; and(d) calcining said polyoxometallate precipitate.