| 摘要 |
Acrylonitrile is prepared by passing a gaseous mixture of propylene, ammonia and oxygen or air at elevated temperature over a catalyst consisting of tellurium oxide and either a salt of phosphomolybdic acid or molybdenum oxide, supported on alumina previously activated by heating at 300 DEG to 1000 DEG C. The gas mixture is passed over the catalyst at 300 DEG to 480 DEG C.ALSO:A catalyst for preparing acrylonitrile consists of tellurium oxide and either a salt of phosphomolybdic acid or molybdenum oxide, supported on alumina previously activated by heating at 300-1000 DEG C. The activated alumina is mixed with the other materials, moulded, and heated e.g. at above 300 DEG C. The materials may be in such proportions that the molar ratii are P = 0 to 3, Te = 3 to 15, Mo = 5 to 20 and Al2O3= 20 to 50. In an example a catalyst is prepared from alumina previously activated by heating at 300-1000 DEG C., tellurium oxide and ammonium phosphomolybdate. Comparative examples describe the use of SiO2 as a support. |
