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Improving the Catalytic Stability of Ni/TiO2 for Ethanol Guerbet Condensation: Influence of Second Metal Component
Kinetics and Catalysis ( IF 1.1 ) Pub Date : 2021-09-25 , DOI: 10.1134/s0023158421050025
Shuaiqi Li 1 , Xiaoxu Han 1 , Hualiang An 1 , Xinqiang Zhao 1 , Yanji Wang 1
Affiliation  

Abstract

Ethanol Guerbet condensation (EGC) is a green process for preparing n-butanol and the development of highly effective solid catalysts is still the bottleneck of this reaction. In this work, a series of multifunctional catalysts Ni–X/TiO2 (X = Ru, Pt, Ir, Au, Cu, Mn, Co, Fe) were prepared by a co-impregnation method in order to improve the catalytic performance, especially the stability. It was found that the addition of the second metal component changed the acidity and alkalinity of Ni/TiO2 catalyst. What is more, acid site number affected ethanol conversion while alkali site number affected n-butanol selectivity. Among the Ni–X/TiO2 catalysts, Ni–Cu/TiO2 showed the best catalytic performance. The effects of preparation conditions on the catalytic performance of Ni–Cu/TiO2 were investigated and the results showed that the suitable preparation conditions were as follows: a Ni/Cu mass ratio of 59 : 1, a Ni–Cu loading of 12.5 wt %, a calcination temperature of 450°C, a calcination time of 2 h, a reduction temperature of 400°C, and a reduction time of 4 h. At a 10 wt % of catalyst loading, a reaction temperature of 210°C and a reaction time of 10 h, the ethanol conversion and the selectivity of n-butanol were 47.9 and 44.4%, respectively. Moreover, the stability of Ni–Cu/TiO2 catalyst was greatly improved due to the interaction between Ni and Cu as compared with the Ni/TiO2 catalyst: the catalytic activity of Ni–Cu/TiO2 did not decline significantly for reuse in three cycles.



中文翻译:

提高 Ni/TiO2 对乙醇格尔伯特缩合的催化稳定性:第二金属组分的影响

摘要

乙醇格尔伯特缩合(EGC)是制备丁醇的绿色工艺,高效固体催化剂的开发仍是该反应的瓶颈。在这项工作中,为了提高催化性能,通过共浸法制备了一系列多功能催化剂 Ni-X/TiO 2 (X = Ru、Pt、Ir、Au、Cu、Mn、Co、Fe),尤其是稳定性。发现第二金属组分的加入改变了Ni/TiO 2催化剂的酸碱度。此外,酸位点数影响乙醇转化率,而碱位点数影响丁醇的选择性。在 Ni-X/TiO 2催化剂中,Ni-Cu/TiO 2表现出最好的催化性能。研究了制备条件对Ni-Cu/TiO 2催化性能的影响,结果表明合适的制备条件如下:Ni/Cu质量比为59:1,Ni-Cu负载量为12.5 wt %,煅烧温度450℃,煅烧时间2h,还原温度400℃,还原时间4h。在催化剂负载量为 10 wt%、反应温度为 210°C 和反应时间为 10 h 时,乙醇转化率和丁醇的选择性分别为 47.9% 和 44.4%。此外,与 Ni/TiO 2相比,Ni-Cu/TiO 2催化剂的稳定性由于 Ni 和 Cu 之间的相互作用而大大提高。催化剂:Ni-​​Cu/TiO 2的催化活性在三个循环中重复使用没有显着下降。

更新日期:2021-09-27
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