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Layered Double Hydroxide Derived Mg2Al-LDO Supported and K-Modified Ru Catalyst for Hydrogen Production via Ammonia Decomposition

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Abstract

Mg–Al mixed oxide is derived via the precursor of Mg2Al-layered double hydroxide (Mg2Al-LDH), and employed to load Ru and KNO3 to develop the K–Ru/Mg2Al-LDO catalyst for hydrogen production through ammonia decomposition. Single MgO and Al2O3 were used to prepare reference catalysts K–Ru/MgO and K–Ru/Al2O3 for comparison. A mechanically mixed K–Ru/MgO and K–Ru/Al2O3 sample was also made to explore the interaction of oxide constituents. K–Ru/Mg2Al-LDO generally outperforms K–Ru/MgO and K–Ru/Al2O3 as well as the Ru-based catalysts supported on other transition metal oxides. The comparison study demonstrated significant impact of structural homogeneity and strong interaction of the oxide constituents on activity. The unique structural feature of Mg2Al-LDO gives rise to the enhanced surface basicity, low-temperature feasible N2 desorption, and remarkable hydrogen spillover effect. All these aspects are favorable on K–Ru/Mg2Al-LDO for electronic modification of Ru sites, rate-determining steps in both low and high reaction temperature, and quick recycle of active sites, accounting for its superior activity plus good durability.

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Acknowledgements

We greatly appreciate the financial support from NSFC (21173118, 21373110) and MSTC (2013AA031703).

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Authors and Affiliations

  1. Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China

    Q. Su, L. L. Gu, A. H. Zhong, Y. Yao, W. J. Ji & W. P. Ding

  2. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong

    C. T. Au

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  1. Q. Su
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  2. L. L. Gu
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  3. A. H. Zhong
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  4. Y. Yao
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  5. W. J. Ji
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  6. W. P. Ding
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  7. C. T. Au
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Correspondence to W. J. Ji.

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Su, Q., Gu, L.L., Zhong, A.H. et al. Layered Double Hydroxide Derived Mg2Al-LDO Supported and K-Modified Ru Catalyst for Hydrogen Production via Ammonia Decomposition. Catal Lett 148, 894–903 (2018). https://doi.org/10.1007/s10562-017-2195-1

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  • DOI: https://doi.org/10.1007/s10562-017-2195-1

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