| 摘要 |
PURPOSE:To manufcture a catalyst capable of obtaining methacrolein at a temp. lower than before with high selectivity and yield by adding Mo, Fe, Co, alkali metal, P, Si, etc. to Bi and W which are previously treated at high temps., and calcining in an air stream. CONSTITUTION:The composition is expressed by the formula Mo12BiaWbFecAd BeCfDgOh, where A is an element selected from Co and Ni, B is an element selected from alkali metal, alkaline earth metal, and Tl, C is an element selected from P, Sb, Sn, Ce, Pb, and Nb, and D is an element selected from Si, Al, Ti, and Zr. When Mo is regulated to 12 and a-h are expressed in the atomic ratios, a=0.1-10.0, b=0.5-10.0, a/b=0.01-6.0, c=0.1-10.0, d=2.0-20.0, e= 0.01-10.0, f=0-10.0, g=0-30, and h is a numerical value determined by the valency of each element. Bi and W are introduced as an oxide obtained by previously calcining a mixture of a Bi compd. and a W compd. at 600-900 deg.C. |
