论文部分内容阅读
分别以两种水热介质对γ-Al_2O_3载体进行水热改性,并将改性后的载体负载CrO_x后应用于异丁烷催化脱氢,考察了水热温度对载体物化性质以及水热改性对催化脱氢性能的影响。通过XRD、N_2吸附-脱附及H_2-TPR对载体结构进行表征。结果表明,水热改性使γ-Al_2O_3发生再水合过程,焙烧后,结晶度变好,活性组分与载体的相互作用增加,CrO_x/Al_2O_3催化剂的异丁烷脱氢性能得到改善。以盐溶液水热改性载体,140℃处理4h,CrO_x/Al_2O_3催化剂表现出较好的异丁烷脱氢性能,10h内异丁烷脱氢平均转化率为43.04%,平均选择性86.34%,失活参数13.7%。
Hydrothermal modification of γ-Al 2 O 3 support was carried out by two kinds of hydrothermal media, respectively, and the modified catalyst was loaded on CrO_x for catalytic dehydrogenation of isobutane. The effects of hydrothermal temperature on the physicochemical properties of the support and hydrothermal modification Effect of Sex on Catalytic Dehydrogenation. The structure of the support was characterized by XRD, N 2 adsorption-desorption and H 2 -TPR. The results show that the hydrothermal modification makes the γ-Al 2 O 3 rehydrate. After calcination, the crystallinity becomes better and the interaction between the active component and the support increases. The isobutane dehydrogenation performance of CrO_x / Al_2O_3 catalyst is improved. The results showed that the CrO_x / Al_2O_3 catalyst exhibited good isobutane dehydrogenation performance at 140 ℃ for 4h. The average dehydrogenation rate of isobutane within 10h was 43.04% with an average selectivity of 86.34% Inactivation parameters 13.7%.