La2O3修饰Cu-ZrO2/γ-Al2O3杂化催化剂对合成气直接合成二甲醚的催化性能增强

Zhuo Li , Jianqing Li , Cheng Yang , Jinhu Wu
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引用次数: 13

摘要

将Cu-ZrO2与γ-Al2O3物理混合制备了一系列杂化催化剂,前者采用共沉淀法制备的不同La2O3负载对其进行改性。采用BET、XRD、n2o -吸附、EXAFS、H2-TPR、NH3-TPD等技术对催化剂进行了表征,并对其在合成气合成二甲醚中的应用进行了评价。结果表明,与Cu-ZrO2/γ-Al2O3催化剂相比,La2O3促进催化剂在CO转化和二甲醚选择性方面表现出明显更好的催化性能,当La2O3含量为12 wt%时催化活性最佳。表征表明,铜的高分散性、铜颗粒的易还原性和适量的酸性位点是催化性能优异的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced catalytic performance for direct synthesis of dimethyl ether from syngas over a La2O3 modified Cu-ZrO2/γ-Al2O3 hybrid catalyst

A series of hybrid catalysts were made by physically mixing Cu-ZrO2 and γ-Al2O3, for former it was modified with different loadings of La2O3 prepared by co-precipitation method. The catalysts were characterized by BET, XRD, N2O-adsorption, EXAFS, H2-TPR, NH3-TPD techniques and evaluated in the synthesis of dimethyl ether from syngas. The results show that La2O3 promoted catalysts displayed a significantly better catalytic performance compared with Cu-ZrO2/γ-Al2O3 catalyst in CO conversion and DME selectivity, and the optimum catalytic activity was obtained when the content of La2O3 was 12 wt%. The characterizations reveal that high copper dispersion, facile reducibility of copper particles and appropriate amount of acidic sites are responsible for the superior catalytic performance.

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来源期刊
Journal of Natural Gas Chemistry
Journal of Natural Gas Chemistry 化学-工程:化工
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