不同载体Co基催化剂对丙烷脱氢性能的影响
Effect of different supports on performance of Co-based catalysts in propane dehydrogenation
通过水热合成法成功制备出二维六方介孔SBA-15分子筛,采用等体积浸渍法将2.0% Co分别负载于SBA-15、SiO2、Al2O3、SBA-15S(商业SBA-15)、ZSM-5、SAPO-34等6种载体上,用于丙烷脱氢制丙烯反应,考察其催化性能及构效关系。结果表明,Co/SBA-15表现出最佳的稳定性及催化性能,丙烷最高转化率可达到45.45%,丙烯选择性为87.25%,丙烯最高收率为39.66%。Co/SBA-15催化剂具有独特的织构性质,既保证了反应物的吸附与活化,又保证了孔道不被堵塞,有利于反应物在其表面进行较快的扩散,表现出最优异的催化性能。
Two-dimensional hexagonal mesoporous SBA-15 molecular sieves are successfully prepared through the hydrothermal synthesis method.Subsequently,2.0% Co is loaded onto SBA-15,SiO2,Al2O3,SBA-15S (commercial SBA-15),ZSM-5,and SAPO-34,respectively via the equal-volume impregnation method.These catalysts are employed in propane dehydrogenation to propylene to evaluate their catalytic performances and structure-activity relationships.It is indicated by the results that Co/SBA-15 exhibits the best stability and catalytic performance,over which the maximum propane conversion rate reaches 45.45%,the propylene selectivity reaches 87.25%,and the maximum propylene yield is 39.66%.Co/SBA-15 catalyst possesses unique textural properties that ensure the adsorption and activation of reactants while prevent pore blockage,facilitating rapid diffusion of reactants on its surface and demonstrating the most superior catalytic performance.
Co-based catalyst / SBA-15 / propane dehydrogenation / low carbon olefin
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