CAJ | 학술논문

采用反加共沉淀法，以硝酸铜、硝酸锌、硝酸铝溶液为原料，碳酸钠溶液为沉淀剂，硝酸铈为助剂，制备了铈（Ce）改性的甲醇合成铜基催化剂（CuZnAlCe），并通过X射线衍射（XRD）、N2等温吸附、热重-差热分析（TG-DTA）、扫描电子显微镜（SEM）、程序升温还原（TPR）等手段进行表征，采用微型固定床反应装置进行催化活性及稳定性评价，考察了Ce含量对CuZnAlCe催化剂结构和催化性能的影响。结果表明，Ce的引入可以改善催化剂活性中心的分散度，使催化剂比表面积增加，整体的结构变得更加松散，催化剂更容易被还原。随着Ce含量的增加，CO的转化率不断增大，当Ce含量为2%时CO转化率最大，可达47.6%。但Ce含量过量时使催化剂还原温度升高，CO的转化率降低。此外，适当的Ce含量改性可以提高铜基催化剂的热稳定性。
채용반가공침정법，이초산동、초산자、초산려용액위원료，탄산납용액위침정제，초산시위조제，제비료시（Ce）개성적갑순합성동기최화제（CuZnAlCe），병통과X사선연사（XRD）、N2등온흡부、열중-차열분석（TG-DTA）、소묘전자현미경（SEM）、정서승온환원（TPR）등수단진행표정，채용미형고정상반응장치진행최화활성급은정성평개，고찰료Ce함량대CuZnAlCe최화제결구화최화성능적영향。결과표명，Ce적인입가이개선최화제활성중심적분산도，사최화제비표면적증가，정체적결구변득경가송산，최화제경용역피환원。수착Ce함량적증가，CO적전화솔불단증대，당Ce함량위2%시CO전화솔최대，가체47.6%。단Ce함량과량시사최화제환원온도승고，CO적전화솔강저。차외，괄당적Ce함량개성가이제고동기최화제적열은정성。
Cerium modified Cu-based catalysts (CuZnAlCe) for methanol synthesis from syngas were prepared by anti-coprecipitation method with Na2CO3 solution as a precipitant, Cu(NO3)2, Zn(NO3)2 and Al2(NO3)3 solution as raw materials. The structure and morphology of CuZnAlCe were studied by X-ray diffraction, thermal gravimetry-differential thermal analysis, N2 adsorption-desorption measurement, scanning electron microscopy, and temperature programmed reduction. The catalytic activities of the prepared catalysts for methanol synthesis were evaluated on micro fixed-bed reaction system. It showed that the addition of Ce improved the dispersion of active sites and provided a high surface area, which play an important role in the stability and activity of CuZnAlCe. The CO conversion reached an optimum value to 47.6% over the Ce modified Cu-based catalyst at the Cu/Ce molar ratio of 1:0.02, while the catalytic activity and stability decreased when the loading of Ce was excessive. Proper loadings of Ce could improve the thermal stability of Cu-based catalysts.