CAJ | 학술논문

采用沉淀凝胶法制备了一系列不同Ce含量的Ce-Cu-SiO2催化剂，利用N2物理吸附(BET)、X射线衍射(XRD)、N2O 吸附、氢气程序升温还原(H2-TPR)和氢气程序升温脱附(H2-TPD)等方法对催化剂进行表征，并在连续流动固定床反应器中考察了催化剂催化草酸二甲酯加氢制取乙二醇的反应性能。实验结果表明，引入适量的Ce能够改善Cu-SiO2催化剂的还原性能，增加Cu0表面积，减小Cu晶粒尺寸，增加催化剂的氢吸附能力。添加适量的Ce可提高催化剂对草酸二甲酯加氢制取乙二醇的选择性和稳定性。在195℃、3 MPa 和质量空速(WHSV)0.07 h-1反应条件下，0.06Ce-Cu-SiO2催化剂上草酸二甲酯转化率可达99.4%，乙二醇选择性可达99.1%，且具有良好的稳定性。
채용침정응효법제비료일계렬불동Ce함량적Ce-Cu-SiO2최화제，이용N2물리흡부(BET)、X사선연사(XRD)、N2O 흡부、경기정서승온환원(H2-TPR)화경기정서승온탈부(H2-TPD)등방법대최화제진행표정，병재련속류동고정상반응기중고찰료최화제최화초산이갑지가경제취을이순적반응성능。실험결과표명，인입괄량적Ce능구개선Cu-SiO2최화제적환원성능，증가Cu0표면적，감소Cu정립척촌，증가최화제적경흡부능력。첨가괄량적Ce가제고최화제대초산이갑지가경제취을이순적선택성화은정성。재195℃、3 MPa 화질량공속(WHSV)0.07 h-1반응조건하，0.06Ce-Cu-SiO2최화제상초산이갑지전화솔가체99.4%，을이순선택성가체99.1%，차구유량호적은정성。
A series of Ce-promoted Cu-SiO2 catalysts with different Ce contents were prepared via a precipitation-gel method, and these catalysts were characterized by N2 adsorption-desorption (BET), X-ray diffraction (XRD), N2O chemisorption, hydrogen temperature-programmed reduction (H2-TPR) and hydrogen temperature-programmed desorption (H2-TPD) techniques. Their catalytic performance in dimethyl oxalate (DMO) hydrogenation to produce ethylene glycol (EG) was investigated in a fixed-bed continuous-flow reactor. The results indicate that the addition of an appropriate amount of Ce can enhance reducibility of the Cu-SiO2 catalysts, increase copper surface area and H2 adsorption capacity, and decrease copper crystal size. Therefore, the selectivity and stability of the catalysts are improved with the addition of Ce. DMO conversion of 99.4%and EG selectivity of 99.1% can be achieved with 0.06Ce-Cu-SiO2 under 195℃ and 3 MPa with WHSV (weight hourly space velocity) of 0.07 h-1, and the catalyst is stable in these studies.