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-  2017 


DOI: 10.3866/PKU.WHXB201704285

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Abstract:

Rh-Mn基催化剂用于合成气制乙醇反应颇具潜力。本文采用柠檬酸乙二醇原位聚合的方法在碳纤维（CF）表面负载Rh-Mn催化剂。采用TPR，XRD，TEM，EDS，CO-TPD，H2脉冲吸附和XPS技术对焙烧和还原后样品的结构和物化性能进行了表征，并考察了催化剂催化合成气制乙醇的反应性能。结果表明，原位聚合法相比传统浸渍法更利于形成紧密接触的Rh-Mn物种，可有效提高Rh的分散度和抗烧结性，显著改善合成气转化反应中CO加氢活性和乙醇选择性。
Rh-Mn-based catalysts are promising for ethanol synthesis from syngas. In this work, a carbon fiber (CF)-supported Rh-Mn catalyst, with highly dispersed Rh and close contact Rh-Mn species, has been prepared by a new in situ polymerization route using citric acid and ethylene glycol interaction. The structure and physicochemical properties of both the calcined and reduced samples have been characterized by TPR, XRD, TEM, EDS, CO-TPD, H2 chemisorption, and XPS techniques and the catalytic performance for ethanol synthesis from syngas has been evaluated. The results show that the new method is beneficial in forming close contact Rh-Mn species than that obtained with the conventional impregnation method. This can enhance the dispersion and sintering resistance of Rh and effectively improve the activity of CO hydrogenation and the selectivity to ethanol in ethanol synthesis from syngas

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