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采用浸渍法制备了稀土镧和铈改性的CuNi/Al2O3催化剂,研究了稀土负载量对催化剂活性和选择性的影响,并研究了催化剂的还原性能。结果表明:La和Ce的存在均降低了活性相CuO和NiO的还原温度,使改性催化剂具有更高的催化活性,但催化剂上乙烯的选择性则是Ce改性催化剂高于La改性催化剂,当CeO2含量为1%时,CeCuNi/Al2O3催化剂上乙炔转化率达到98%,乙烯选择性和收率则分别达到84%和82.3%,比未改性的CuNi/Al2O3催化剂上乙烯收率高16.4%,显示出CeO2改性CuNi/Al2O3催化剂的优异性能。
The rare earth lanthanum and cerium-modified CuNi / Al2O3 catalysts were prepared by impregnation method. The effects of rare earth loading on the activity and selectivity of the catalysts were investigated. The reduction performance of the catalysts was also studied. The results show that both La and Ce reduce the reduction temperature of the active phase CuO and NiO so that the modified catalyst has higher catalytic activity. However, the selectivity to ethylene on the catalyst is higher than that of the Ce modified catalyst over the La modified catalyst , When the content of CeO2 is 1%, the conversion of acetylene on CeCuNi / Al2O3 catalyst reaches 98%, the selectivity and yield of ethylene reach 84% and 82.3% respectively, which is higher than that of unmodified CuNi / Al2O3 catalyst 16.4%, showing the excellent performance of CeO2 modified CuNi / Al2O3 catalyst.