关键词: 双金属, USY分子筛改性, 催化, 氧化反应, 选择性

Abstract: A series of USY zeolite catalysts modified by single and bimetal metals were prepared by impregnation method. Copper nitrate and cobalt nitrate serve as the copper and cobalt source, repsectively. The obainted catalysts were characterized by XRD, FTIR, BET and SEM, and subsquently used for the catalytic oxidation of ethylbenzene to acetophenone in a btach reactor. The effcts of the metal loading dosage and bimetallic modification of the USY catalysts on the reaction were investiaged. The results showed that cobalt element has a synergistic effect on the uniform distribution of copper on the USY zeolite. The 5%Co/20%Cu-USY catalyst has the best catalytic performance for oxidation of ethylbenzene when the loading(mass percent) of Co and Cu was 5% and 20%, respectively. The conversion of ethylbenzene and the selectivity of acetophenone reached 29.8% and 87.2%, respectively. Recycle run results suggested that 5%Co-20%Cu-USY was stable for at least 4 cycles without obvious changes of catalytic activity and selectivity.

Key words: bi-metal, modified USY zeolite, catalysis, oxidation reaction, selectivity