F-T合成“蛋壳”型Co/ZrO_2/SiO_2催化剂的制备及表征

PREPARATION AND CHARACTERIZATION OF EGGSHELL Co/ZrO_2/SiO_2 CATALYSTS FOR THE F-T SYNTHESIS

采用浸渍法制备了ZrO2改性的的硅胶催化剂载体,并以该载体制备了"蛋壳"型催化剂,利用BET,SEM和EDS等考察了钴基催化剂的结构和还原性能.结果表明,ZrO2改性的"蛋壳"型催化剂具有更好的比表面性能;ZrO2改性的载体有利于提高催化剂的分散程度、催化活性及C5+选择性.在温度250℃,压力2MPa,空速500h-1条件下,"蛋壳"型催化剂上CO转化率可达到89.87%～96.58%,C5+选择性为76.8%～84.7%.

A simple preparation of bimodal porous support was to introduce ZrO2 into bigger pores of formless SiO2 directly,then a kind of eggshell catalyst based on this bimodal porous support was prepared.The structure and reduction property of the catalysts were characterized by SEM,EDS,Brunner-Enunett-Teller（BET） and temperature-programmed-reduction（TPR） techniques.The results show that the BET surface area and pore volume of catalyst were increased compared to the original silica gel and catalyst,catalysis activity and selectivity for C＋5 hydrocarbon.The CO conversion are 89.87%-96.58%,the selectivity for C＋5 hydrocarbon is 76.8%-84.7%,and the alkene/alkane rate in tail gas is close to zero at the condition of temperature 250 ℃,pressure 2 MPa,and airspeed 500 h-1.