| 摘要 |
<p>An ammoxidation catalyst composition for use in the production of acrylonitrile or methacrylonitrile from propylene or isobutylene with a significantly improved selectivity for acrylonitrile or methacrylonitrile. The composition contains oxides of molybdenum, bismuth and iron and an oxide of component (A) which is at least one element selected from potassium, rubidium and cesium, and is composed of an oxide catalyst, wherein the atomic ratios of bismuth, iron and component (A) to 12 atoms of molybdenum are, respectively, 0.1 to 6, 0.1 to 8 and 0.01 to 0.5, and a silica carrier for supporting the catalyst, the amount of which carrier is 40-60 wt. % of the total amount of the catalyst and the carrier. It is prepared by using as a silica source a silica sol wherein the atomic ratio of aluminum to 100 atoms of silicon is 0.04 or less.</p> |
