Catalyst based heteropolyacid and its use for the preparation of acetic acid by mild oxidation of ethane.

摘要

The present invention relates to a process for the preparation of acetic acid by controlled oxidation of ethane with an oxygen source, in the presence of a catalyst whose active phase comprises a heteropoly acid of formula (I) Ax Wherein: BR/ - A represents a monovalent cation selected from hydrogen, an alkali metal, or the ammonium ion; BR/ - B represents VO2 +, VO3 +, an ion of an alkaline earth metal or a metal of columns VII A, VIII, I B, IV B and V B of the periodic table of elements; BR/ - C represents W, Mo; BR/ - x = 3 + z - alphay and x positive; with alpha, depending on the charge of the ion B, equal to 2, 3 or 4; BR/ - y varies from 0 to 2 inclusive; BR/ - z varies from 1 to 3 inclusive. The subject of the invention is also a composition comprising titanium dioxide as support and a heteropoly acid of formula (I) above. BR/ Finally, it relates to a catalyst whose active phase is the composition defined above. / P