Co-MCM-41催化剂上临CO_2-乙烷脱氢反应的研究

CO_2-Dehydrogenation of Ethane over Co-MCM-41 Catalyst

合成了不同Co掺杂量的Co-MCM-41分子筛.用XRD,FTIR和TG-DTA等技术对所制样品进行表征.在常压连续流动固定床反应器上考察了它们对临CO2-乙烷脱氢制乙烯反应的性能,结果表明,3%Co-MCM-41在973K可使乙烷的转化率达到39.54%,乙烯的选择性达到98.59%,收率达到38.98%.Co的掺杂量和反应温度等条件对该反应均有一定影响.Co-MCM-41对乙烷催化脱氢制乙烯同样也有很高的活性.引入CO2可消除积炭对催化剂活性的影响,更有利于催化反应的进行.

MCM-41 mesoporous molecular sieves containing different contents of cobalt was synthesized by direct insertion of cobalt ions as the precursor prepared at room temperature in an initial stage of the synthesis. The catalysts were characterized by XRD, IR and TG-DTA techniques. The catalytic properties of this series of catalysts for the title reaction were tested with a continuous-flow fixed-bed quartz reactor. The experimental results indicate that a 39.54% conversion of ethane and a 98.59% selectivity of ethylene were achieved over 3%Co-MCM-41 catalyst in the CO_2-dehydrogenation of ethane. The content of cobalt and reaction temperature are important influence factors for the reaction. The 3%Co-MCM-41 showed a high activity for dehydrogenation of ethane to ethylene, and CO_2 could eliminate the deposited carbon on the catalysts, which favored the title reaction.