The catalyst prepared by impregnation method had good performance in both activity and selectivity,and contained 0.8 molar ratio of chrome and vanadium and 1.2 molar ratio of phosphorus and vanadium and with activated alumina as support.是什么意思_The catalyst prepared by impregnation method had good performance in both activity and selectivity,and contained 0.8 molar ratio of chrome and vanadium and 1.2 molar ratio of phosphorus and vanadium and with activated alumina as support.在线翻译_英语_读音_用法_例句