CAJ | 학술논문

以氢氧化钠为沉淀剂,制备系列Cu-Zn-Ca-Zr-O复合氧化物催化剂,考察沉淀剂浓度对催化剂形貌及催化性能的影响,通过XRD、SEM、TEM、TPR、BET和XPS等对催化剂进行表征.结果表明,沉淀剂浓度对催化剂形貌和孔径均有影响,制备的催化剂中,分散在载体表面的氧化铜起主要催化作用,是催化活性中心.考察催化剂对四氯乙烷脱氢制备四氯乙烯反应的催化性能,结果表明,在反应温度310 ℃、空速0 . 5 h-1和沉淀剂质量浓度10%条件下,催化剂催化四氯乙烷脱氢的活性最高,四氯乙烷转化率为80 . 0%,四氯乙烯选择性为96 . 0%.
이경양화납위침정제,제비계렬Cu-Zn-Ca-Zr-O복합양화물최화제,고찰침정제농도대최화제형모급최화성능적영향,통과XRD、SEM、TEM、TPR、BET화XPS등대최화제진행표정.결과표명,침정제농도대최화제형모화공경균유영향,제비적최화제중,분산재재체표면적양화동기주요최화작용,시최화활성중심.고찰최화제대사록을완탈경제비사록을희반응적최화성능,결과표명,재반응온도310 ℃、공속0 . 5 h-1화침정제질량농도10%조건하,최화제최화사록을완탈경적활성최고,사록을완전화솔위80 . 0%,사록을희선택성위96 . 0%.
Using sodium hydroxide with different concentrations as the precipitator,a series of Cu-Zn-Ca-Zr-O mixed oxide catalysts was prepared by co-precipitation method. The as-prepared catalysts were char-acterized by XRD,SEM,TEM,TPR,BET and XPS. The influence of precipitator concentrations on the morphology and the performance of the catalysts was investigated. The results showed that precipitator con-centration controlled the pore structure and specific surface area of catalysts. The high dispersed copper oxide on support surface contributed primarily to the reaction activity and was the catalytic active centre. The catalytic properties of Cu-Zn-Ca-Zr-O catalysts were investigated by dehydrogenation of tetrachloro-ethane to tetrachloroethylene. The results indicated that the catalyst prepared with the precipitator NaOH of 10 wt% exhibited the highest catalytic activity under the optimal condition of reaction temperature 310 ℃ and space velocity 0 . 5 h -1 . The conversion of tetrachloroethaneand the selectivity to tetrachloro-ethylene was 80. 0% and 96. 0%,respectively.