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Stable and recyclable Pd catalyst supported on modified silica hollow microspheres with macroporous shells for enhanced catalytic hydrogenation of NBR

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Abstract

In this work, a stable and recyclable Pd catalyst supported on N-containing silane coupling agent modified silica hollow microspheres with macroporous shells (Pd/N-SHMs) was successfully prepared and used for the selective hydrogenation of nitrile-butadiene rubber (NBR) with enhanced catalytic performance. The results showed that Pd/N-SHMs possessed small-sized and well-dispersed Pd nanoparticles (NPs) and the macroporous shells were beneficial for the diffusion of macromolecular NBR, and thus with such a catalyst, the reaction could occur under mild conditions and high hydrogenation degree (96.6%) with 100% selectivity to C=C was obtained. The prepared catalyst could be easily recycled and reused with a high efficiency. More importantly, because of the strong coordination between Pd and diamine ligands, Pd NPs could be anchored steadily over the support and only 5.0 ppm Pd residues was detected in products. This reaction was considered as pseudo-first order at high H2 pressures, and the reaction activation energy was calculated to be as low as 18.1 kJ/mol. Our contribution is to provide an efficient and recyclable supported Pd catalyst, which may promote the development of heterogeneous catalytic systems for unsaturated macromolecular hydrogenation.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant 21576290, 21776048), Fujian Province Natural Science Funds for Distinguished Young Scholar (2018J06002) and Fujian young top-notch innovative talent project.

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China

    Jian Chen, Lei Ma, Tingting Cheng, Aofei Cai, Zhijie Wu & Haiyan Liu

  2. National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou, 350002, China

    Yuandong Hu & Pei Yuan

  3. State Key Laboratory of Energy and Environmental Photocatalysis, College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China

    Xiaojun Bao

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  1. Jian Chen
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Correspondence to Pei Yuan.

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Chen, J., Ma, L., Cheng, T. et al. Stable and recyclable Pd catalyst supported on modified silica hollow microspheres with macroporous shells for enhanced catalytic hydrogenation of NBR. J Mater Sci 53, 15064–15080 (2018). https://doi.org/10.1007/s10853-018-2698-1

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