CAJ | 학술논문

采用共沉淀法制备Cu/MnO/Al2 O3催化剂，运用N2吸附-脱附、XRD、XRF和H2-TPR等对其进行表征，并用于乙酸甲酯加氢制乙醇反应，考察共沉淀加料方式对催化剂结构及其催化性能的影响。结果表明，共沉淀时采用的加料方式显著影响制备的Cu/MnO/Al2 O3催化剂的织构性质、CuO晶粒大小、还原性能和化学组成，这些因素共同作用决定了催化剂在乙酸甲酯加氢反应中的催化性能。其中，反加法制得的催化剂Cu和Mn组分含量相对比值接近理论值，且具有较高的比表面积和较佳的还原性能，因而表现出最佳的催化性能，在反应温度200℃、压力6.5 MPa、空速0.6 h-1和氢酯物质的量比50条件下，乙酸甲酯转化率和乙醇选择性分别达98.9%和98.1%。
채용공침정법제비Cu/MnO/Al2 O3최화제，운용N2흡부-탈부、XRD、XRF화H2-TPR등대기진행표정，병용우을산갑지가경제을순반응，고찰공침정가료방식대최화제결구급기최화성능적영향。결과표명，공침정시채용적가료방식현저영향제비적Cu/MnO/Al2 O3최화제적직구성질、CuO정립대소、환원성능화화학조성，저사인소공동작용결정료최화제재을산갑지가경반응중적최화성능。기중，반가법제득적최화제Cu화Mn조분함량상대비치접근이론치，차구유교고적비표면적화교가적환원성능，인이표현출최가적최화성능，재반응온도200℃、압력6.5 MPa、공속0.6 h-1화경지물질적량비50조건하，을산갑지전화솔화을순선택성분별체98.9%화98.1%。
Cu/MnO/Al2 O3 catalysts were prepared by coprecipitation method and were characterized by N2 adsorption-desorption,XRD,XRF,and H2-TPR. The as-prepared catalysts were used for methyl acetate hydrogenation to ethanol,and the effect of addition modes during preparation on their structure and prop-erties was investigated. The results showed that the addition modes of coprecipitation method had greatly influence on the textural properties,CuO particle sizes,reducibility and chemical composition of Cu/MnO/Al2 O3 catalysts,which gave rise to different catalytic performance in the methyl acetate hydrogena-tion reaction. The catalyst prepared by reverse mode( base to salt)possessed larger specific surface area and higher reducibility,and exhibited the best catalytic properties in the reaction,which could be attributed to desired control of Cu and Mn contents. Under the condition of 200 ℃,6. 5 MPa,LHSV=0. 6 h-1 ,H2/ester molar ratio=50,methyl acetate conversion and the selectivity to ethanol reached 98. 9% and 98. 1%, respectively.