SiO2修饰 TiO2负载钴基费－托合成催化剂及性能研究

摘要

SiO2 modified TiO2 supports were synthesized by Stöber and impregnation methods.The cobalt catalysts supported on the SiO2 modified TiO2 were prepared by incipient wetness impregnation and the performances in Fischer-Tropsch( FT) synthesis were investigated.The supports and catalysts were characterized by TEM, XRD, H2-TPR and nitrogen adsorption-desorption.The FT catalytic performances of catalysts were tested on fix-bed reactor.The results indicated that SiO2 could decrease the interaction of support and cobalt oxide and improve the reducibility of cobalt oxide, thus significantly improve the FT catalytic performances of catalysts.%采用Stöber法和浸渍法制备了SiO2修饰的TiO2载体，并用浸渍法制备了钴基费－托合成催化剂，考察了其费－托合成催化性能。分别采用透射电子显微镜（ TEM）、X－射线衍射（ XRD）、低温氮气物理吸附－脱附、氢气程序升温还原（ H2－TPR）等技术对载体和催化剂进行了表征，在固定床反应器上对催化剂的催化性能进行了评价。结果表明：SiO2的引入能减弱钴物种与TiO2之间的相互作用力，提高钴物种的还原性，使催化剂的催化性能显著提高。