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卡斯摩: 金币+15, 翻译EPI+1, ★★★很有帮助 2015-11-20 08:21:24
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Using homogeneous precipitation method, catalyst CuO-ZnO-SrO and CuO-ZnO-MgO were prepared, which then served as components of methanol synthesis for dimethyl ether synthesis by CO2 hydrogenation. Characterization was conducted through XRD, N2 adsorption-desorption, H2-TPR and XPS, and the results showed that compared with CuO-ZnO-ZrO2, the modification of Sr made a great contribution in increasing the reducibility of catalyst and in decreasing outer shell electron density of Cu, leading to an increased selectivity of dimethyl ether. CuO-ZnO-MgO has a larger specific surface area over CuO-ZnO-SrO, therefore,CuO-ZnO-MgO did a better job in enhancing CuO distribution and in decreasing the grain size of CuO, which means increasing the selectivity of dimethyl ether as well as increaing the conversion ratio of CO2. Therefore, we can conclude that CuO-ZnO-MgO is more superior than CuO-ZnO-SrO in terms of catalytic activity. |
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