V/SiO2 catalysts compared to Cr/SiO2 catalysts were studied for dehydrogenation of n-butane to butenes. Several methods for characterization of catalysts such as FT-IR, UV-vis and Raman spectroscopies were used. Some ...V/SiO2 catalysts compared to Cr/SiO2 catalysts were studied for dehydrogenation of n-butane to butenes. Several methods for characterization of catalysts such as FT-IR, UV-vis and Raman spectroscopies were used. Some differences between two catalysts were showed, including the performances of catalysts, distribution of products and mechanism of reactions. The results showed that prepared catalysts with 12m% of active component loading all demonstrated best conversion of n-butane to butene at a reaction temperature of around 590 ℃. Two different reaction mechanisms were mentioned to well explain why iso-butene was produced on V/SiO2 catalysts but not on Cr/SiO2 catalysts.展开更多
以V_2O_5为活性组分,通过对催化剂活性组分、载体结构和助剂等因素的研究,制备La-V/TiO_2-SiO_2催化剂,在n(甲醇)∶n(乙醇)=4∶1、空速1.5 h-1、氮气流量120 m L·min^(-1)、反应温度360℃和常压条件下,乙醇转化率84%,异丁醛选择性...以V_2O_5为活性组分,通过对催化剂活性组分、载体结构和助剂等因素的研究,制备La-V/TiO_2-SiO_2催化剂,在n(甲醇)∶n(乙醇)=4∶1、空速1.5 h-1、氮气流量120 m L·min^(-1)、反应温度360℃和常压条件下,乙醇转化率84%,异丁醛选择性67%。展开更多
基金The Program for New Century Excellent Talents in University (Grant No.NCET-04-0987)Doctor Fund of Science Research of Xinjiang University (Grant No. BS060101)
文摘V/SiO2 catalysts compared to Cr/SiO2 catalysts were studied for dehydrogenation of n-butane to butenes. Several methods for characterization of catalysts such as FT-IR, UV-vis and Raman spectroscopies were used. Some differences between two catalysts were showed, including the performances of catalysts, distribution of products and mechanism of reactions. The results showed that prepared catalysts with 12m% of active component loading all demonstrated best conversion of n-butane to butene at a reaction temperature of around 590 ℃. Two different reaction mechanisms were mentioned to well explain why iso-butene was produced on V/SiO2 catalysts but not on Cr/SiO2 catalysts.
