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卡斯摩木虫 (正式写手)
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| 利用均匀沉淀法制备了CuO-ZnO-SrO、CuO-ZnO-MgO催化剂，并将其作为甲醇合成组分用于CO2加氢合成二甲醚反应。通过XRD、氮气吸附脱附、H2-TPR、XPS进行表征。结果表明，相比于CuO-ZnO-ZrO2催化剂，Sr的改性在提高催化剂的还原能力和减小Cu外层电子密度方面表现出色，导致二甲醚的选择性增加。CuO-ZnO-MgO比CuO-ZnO-SrO催化剂拥有更大的比表面积，在促进CuO的分散和减小CuO晶粒尺寸方面有优异的表现，这不仅增加了二甲醚的选择性，还提高了CO2的转化率，其催化活性要高于CuO-ZnO-SrO催化剂。 |
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武汉一心一译 
捐助贵宾 (著名写手)
- 翻译EPI: 502
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- 专业: 高分子合成化学
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卡斯摩: 金币+15, 翻译EPI+1, ★★★很有帮助 2015-11-20 08:21:24
卡斯摩: 金币+15, 翻译EPI+1, ★★★很有帮助 2015-11-20 08:21:24
| 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. |
2楼2015-09-24 10:20:07
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