水热改性对铝基载体孔结构及异丁烷脱氢性能的影响
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摘要
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%。
γ-Al_2O_3 carriers were modified by hydrothermal treatment with two hydrothermal solvents and applied in catalytic isobutane dehydrogenation,the effect of hydrothermal treatment temperature on physicochemical properties of alumina carriers as well as the influence of hydrothermal modification on catalyst's dehydrogenation performance were studied. The modified γ-Al_2O_3 carriers were characterized by XRD,N_2adsorption-desorption and H_2-TPR. The results showed that the crystallinity of γ-Al_2O_3 was increased after hydration and calcination process. And hydrothermal treatment enhanced the interaction between active component and carriers,and improved the performance of CrO_x/ Al_2O_3. Through hydrothermal treatment with salt solution,the CrO_x/ Al_2O_3 catalyst exhibited the optimal isobutane dehydrogenation performance when supports were treated at 140℃ for 4 h,average isobutane dehydrogenation conversion,average selectivity and deactivation ratio for reaction 10 h were 43. 04 %,86. 34 % and 13. 7 %,respectively.
γ-Al_2O_3 carriers were modified by hydrothermal treatment with two hydrothermal solvents and applied in catalytic isobutane dehydrogenation,the effect of hydrothermal treatment temperature on physicochemical properties of alumina carriers as well as the influence of hydrothermal modification on catalyst's dehydrogenation performance were studied. The modified γ-Al_2O_3 carriers were characterized by XRD,N_2adsorption-desorption and H_2-TPR. The results showed that the crystallinity of γ-Al_2O_3 was increased after hydration and calcination process. And hydrothermal treatment enhanced the interaction between active component and carriers,and improved the performance of CrO_x/ Al_2O_3. Through hydrothermal treatment with salt solution,the CrO_x/ Al_2O_3 catalyst exhibited the optimal isobutane dehydrogenation performance when supports were treated at 140℃ for 4 h,average isobutane dehydrogenation conversion,average selectivity and deactivation ratio for reaction 10 h were 43. 04 %,86. 34 % and 13. 7 %,respectively.
引文
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