K/MgFeZn-HTLcs催化CO加氢制低碳烯烃性能研究  被引量:4

Direct synthesis of light olefins from CO hydrogenation over K/MgFeZn-HTLcs catalysts

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作  者:马丽萍[1] 张建利[1] 马清祥[1] 范素兵[1] 赵天生[1] 

机构地区:[1]宁夏大学化学化工学院省部共建天然气转化国家重点实验室培育基地,宁夏银川750021

出  处:《燃料化学学报》2016年第4期449-456,共8页Journal of Fuel Chemistry and Technology

基  金:宁夏自然科学基金(NZ13010)资助~~

摘  要:以MgFeZn-HTLcs为前驱体,制备了不同Mg/Fe/Zn物质的量配比、K改性的K/MgFeZn-HTLcs催化剂,用于CO加氢直接制低碳烯烃反应。采用N2吸附-脱附、SEM、TG、XRD、XPS、H_2-TPR等手段对催化剂进行了表征。结果表明,MgFeZnHTLcs前驱体具有典型的层状结构,孔径分布均一;经焙烧、K改性后仍具有一定的层状结构,但比表面积显著减小,平均孔径增大;新鲜催化剂物相以金属氧化物和铁酸盐为主,反应后K/MgFeZn-HTLcs催化剂主要以Fe_5C_2、MgCO_3和ZnO相存在,K/2Fe-1Zn催化剂主要物相为ZnFe2O_4。在CO加氢反应中,K/MgFeZn-HTLcs催化剂具有较高的C=2-4烯烃选择性和较低的C+5含量,与K/2Fe-1Zn催化剂相比,产物分布明显改善;K/2Mg-2Fe-1Zn催化剂上O/P比值达5.15,C=2-4含量占总烃质量的48.56%。A series of K promoted K /MgFeZn-HTLcs catalysts with different Mg / Fe / Zn molar ratios were prepared by means of precipitation method and impregnation method for the direct synthesis of light olefins from CO hydrogenation. The samples were characterized by N2adsorption-desorption SEM,TG,XRD,XPS and H2-TPR measurements. The results showed that theMgFeZn-HTLcs catalyst precursors have typical lamellar structure,larger specific surface area and average pore diameter compared with Fe / Zn catalyst. The BET surface area and the average pore diameter decreased after calcination and K promotion. The bulk composition of the calcined samples was mainly metal oxide and ferrite. Fe_5C_2,MgCO_3 and Zn O were formed in K /MgFeZn-HTLcs catalysts after reaction. However,the main phase in K / 2Fe-1Zn catalyst was stabilized in ZnFe2O_4. During CO hydrogenation,the prepared samples showed high C=2-4selectivity and lowC+5weight fraction compared with that of K / 2Fe-1Zn sample. The product distribution was greatly improved. Over the sample K / 2Mg-2Fe-1Zn,an olefin to paraffin ratio of 5.15 and the C=2-4weight olefin content of 48.56% could be obtained.

关 键 词:费托合成 K/MgFeZn-HTLcs催化剂 CO加氢 低碳烯烃 

分 类 号:O643.36[理学—物理化学]

 

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