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Research Article

Regulation of surface carbides on palladium nanocubes with zeolitic imidazolate frameworks for propyne selective hydrogenation

Linzhong Wu1,2,§, Mingyu Chu1,§, Jin Gong1, Muhan Cao1( ), Yu Liu1, Yong Xu1,2( )
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, No. 199 Ren’ai Road, Suzhou 215123, China
Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
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Abstract

The selective hydrogenation of propyne to propylene has attracted great attention in chemical industry for removing trace amount of propyne for producing polymer-grade propylene. As the state-of-the-art catalyst, Pd suffers from the disadvantage of poor propylene selectivity due to the over-hydrogenation of propylene to propane. We here demonstrate that Pd nanocubes (NCs) coated by zeolitic imidazolate frameworks (i.e., Pd NCs@ZIF-8) can serve as highly active and selective catalysts for propyne selective hydrogenation (PSH). Benefitting from the unique properties and abundant groups of ZIF-8, Pd carbide (Pd-C) is formed on the surface of Pd NCs after thermal treatment, which acts the active sites for PSH to propylene. More importantly, the content of Pd-C can be precisely controlled by altering the calcination temperature without aggregation of Pd NCs and obvious changes in the framework of ZIF-8. The formation of Pd-C on Pd NCs@ZIF-8 can strongly suppress the H2 adsorption, and thus selectively catalyze propyne to propylene. Consequently, the optimized catalyst (i.e., Pd NCs@ZIF-8-100) exhibits a propylene selectivity of 96.4% at a propyne conversion of 93.3% at 35 °C and atmospheric pressure. This work may not only provide an efficient catalyst for PSH, but also shed a new light on the catalytic application of ZIFs.

Keywords

propyne selective hydrogenationPd nanocubeszeolitic imidazolate frameworkscore-shell nanostructuresPd carbide

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1559-1564
DOI: 10.1007/s12274-020-3235-5
Cite this article:
Wu L, Chu M, Gong J, et al. Regulation of surface carbides on palladium nanocubes with zeolitic imidazolate frameworks for propyne selective hydrogenation. Nano Research, 2021, 14(5): 1559-1564. https://doi.org/10.1007/s12274-020-3235-5
Topics:
CarbidesCatalyst selectivity HydrogenationPalladium compounds

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Received: 05 September 2020
Revised: 09 November 2020
Accepted: 12 November 2020
Published: 06 January 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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