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Recent advances in selective C-C bond coupling for ethanol upgrading over balanced Lewis acid-base catalysts

平衡Lewis酸碱催化剂催化乙醇转化形成C-C键的 最新进展

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Abstract

Ethanol is a considerable platform molecule in biomass conversion, which could be acquired in quantity through acetone-butanol-ethanol (ABE) fermentation. People have been working on the upgrading of ethanol to value added chemicals for decades. In the meantime, 1-butanol and a series of value added products have been selectively generated through C-C bond coupling. In this mini-review, we focus on the recent advances in selective C-C bond formation over balanced Lewis acid-base catalysts such as modified metal oxide, mixed metal oxide, hydroxyapatite and zeolite confined transition metal oxide catalysts. Among them, Pd-MgAlOx and Sr-based hydroxyapatite exhibit >70% 1-butanol selectivity, while ZnxZryOz and Ta-SiBEA zeolite achieve >80% of isobutene and butadiene selectivity respectively. The mechanism and reaction pathway of C-C bond formation in each reaction system are described in detail. The correlation between C-C bond coupling and the acidity/basicity of the Lewis acid-base pairs from the surface of the catalysts are also discussed.

摘要

乙醇是生物质转化过程中重要的平台分子, 可以通过ABE (丙酮-丁醇-乙醇)发酵过程大量获得. 近几十年来, 人们一直致力 于将乙醇升级为高附加值化学品. 通过C-C键生成过程, 选择性地 生成了1-丁醇和一系列高附加值产品. 本文总结了近年来在平衡 Lewis酸碱催化剂上选择性生成C-C键的研究进展, 包括金属氧化 物催化剂、混合金属氧化物催化剂、羟基磷灰石和沸石分子筛限 域过渡金属氧化物催化剂. 其中Pd-MgAlOx和Sr基羟基磷灰石催化 剂对应1-丁醇的选择性>70%, ZnxZryOz和Ta-SiBEA沸石对异丁烯 和丁二烯的选择性>80%. 本文详细介绍了各反应体系中C-C键形 成的机理和反应路径, 并讨论了C–C键生成与催化剂表面Lewis 酸、碱强度的关系.

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Acknowledgements

The work was supported by the “111 Project” of China (B18030) and Nankai University.

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  1. School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China

    Jingjing Dai  (戴菁菁) & Hongbo Zhang  (张洪波)

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Zhang H provided the overall concept. Dai J wrote the paper with the support from Zhang H. Zhang H revised the manuscript. All authors participated in the general discussion.

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Correspondence to Hongbo Zhang  (张洪波).

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The authors declare no conflict of interest.

Jingjing Dai was born in 1994. She received her BSc degree from Shaanxi University of Science & Technology, Xi’an, in 2018. Now, she is a PhD student in Prof. Hongbo Zhang’s group in Nankai University. Her research interest is focused on the platform molecule catalytic transformation based on C-C bond formation and the correlation between the Lewis acid strength as well as the pore structure of metal-organic frameworks and C-C bond formation.

Hongbo Zhang was born in 1983. He received his PhD in physical chemistry from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, in 2012, supervised by Prof. Xinhe Bao and Prof. Xiulian Pan. After graduation he moved to Argonne National Laboratory (USA) as a postdoctor under the supervision of Dr. Christopher L. Marshall, working on atomic layer deposition in catalysis (2013–2015). Then he continued his research by collaboration with Robert M. Rioux at the Pennsylvania State University and David W. Flaherty in the University of Illinois at Urbana Champaign before he joined Nankai University as an independent research scientist in 2018. He is now working on upgrading of platform bio-molecules, such as furfural and ethanol etc. and small molecular activation with a combination of in-situ/operando characterizations (such as XAFS, ssNMR, FTIR etc.) and kinetic studies.

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Dai, J., Zhang, H. Recent advances in selective C-C bond coupling for ethanol upgrading over balanced Lewis acid-base catalysts. Sci. China Mater. 62, 1642–1654 (2019). https://doi.org/10.1007/s40843-019-9454-x

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