CAJ | 학술논문

以琼脂为分散介质采用凝胶网格共沉淀法制备了金属氧化物助剂改性的CuO-ZnO-Al2O3催化剂，在固定床连续流动反应装置上考察了5种助剂对CuO-ZnO-Al2O3催化剂催化CO2加氢合成甲醇反应性能的影响。利用N2吸附-脱附、XRD、H2-TPR、SEM等方法对催化剂进行了表征。结果表明：CeO2尤其是Er2O3的添加可提高CuO-ZnO-Al2O3催化剂的活性，在230℃、2.0MPa、空速2400mL/(g·h)、V(H2)/V(CO2)=3∶1的反应条件下，甲醇的选择性和时空收率均有所提高；添加CeO2或Er2O3后增大了催化剂的比表面积，同时提高了催化剂中CuO的分散度。
이경지위분산개질채용응효망격공침정법제비료금속양화물조제개성적CuO-ZnO-Al2O3최화제，재고정상련속류동반응장치상고찰료5충조제대CuO-ZnO-Al2O3최화제최화CO2가경합성갑순반응성능적영향。이용N2흡부-탈부、XRD、H2-TPR、SEM등방법대최화제진행료표정。결과표명：CeO2우기시Er2O3적첨가가제고CuO-ZnO-Al2O3최화제적활성，재230℃、2.0MPa、공속2400mL/(g·h)、V(H2)/V(CO2)=3∶1적반응조건하，갑순적선택성화시공수솔균유소제고；첨가CeO2혹Er2O3후증대료최화제적비표면적，동시제고료최화제중CuO적분산도。
CuO/ZnO/Al2O3 catalysts modified by metal oxide additives were prepared by gel-network-coprecipitation method using agar as dispersion medium. The effects of five different additives on the catalytic performances of the catalysts for methanol synthesis from CO2 hydrogenation were investigated in a fixed-bed continuous flow reactor. The catalysts were characterized by N2 adsorption-desorption, XRD, TPR and SEM. The results showed that adding CeO2, especially Er2O3 to the CuO/ZnO/Al2O3 catalyst could improve its methanol synthesis activity, which resulted in a higher selectivity and space time yield of methanol under the reaction conditions: 230℃, 2.0MPa, GHSV of 2400mL·g-1·h-1 and H2/CO2 feed volume ratio of 3. The catalysts modified by CeO2 or Er2O3 had a larger specific surface area and a higher dispersion degree of CuO.