Catalytic Activity of V-Substituted Cs_2Te_(0.2)H_(0.6+x)PMo_(12-x)V_xO_n Heteropoly Compounds in Selective Oxidation of Isobutane

摘要

A series of Cs_2Te_(0.2)H_(0.6+x)PMo_(12-x)V_xO_n (x = 0-3) heteropoly compounds has been. prepared and tested in the partial oxidation of isobutane. Catalytic tests show that at 350℃ very high selectivity to meth-acrylic acid (60.1%) can be achieved at isobutane conversion of 12.2% over a Cs_(2.0)Te_(0.2)H_(1.6)PMo_(11)VO_n catalyst with only one molybdenum atom per.unit cell substituted by vanadium. The presence of Te~(4+) in the heteropoly compounds appears to interfere with the dehydrqgenation step and favor the formation of methacrolein and methacrylic acid.