关键词:

介孔氧化铝, 氧化铼, 丁烯, 歧化, 丙烯

Abstract:

Re₂O₇/meso-Al₂O₃ catalysts with different Re₂O₇ loadings were prepared by wetness impregnation of Re₂O₇ on mesoporous alumina.The catalytic performance of the catalysts was also investigated, and compared with Re₂O₇/γ-Al₂O₃ catalyst.The results showed that with the increase of Re₂O₇ loading, the BET surface area and pore volume of the catalysts decreased while the acid amount increased.The metathesis catalyst was prepared by impregnation under the conditions of 60℃, 1 h^-1 and atmospheric pressure, and the initial conversion of butene was about 54%, by using Re₂O₇/meso-Al₂O₃ as the catalyst.The Re₂O₇/meso-Al₂O₃ with m(Re₂O₇)∶m(Al₂O₃)=0.2 exhibited the best catalytic performance of olefin metathesis among the Re₂O₇/meso-Al₂O₃ catalysts.The reaction selectivity of propylene was about 55%, and the life-time of catalyst was 120 h.

Key words:

介孔氧化铝, 氧化铼, 丁烯, 歧化, 丙烯