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PtNi nanoparticles embedded in porous silica microspheres as highly active catalysts for p-nitrophenol hydrogenation to p-aminophenol

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Abstract

Supported Pt-based alloy nanoparticles have attracted greater attention in catalysis due to their high activity, reduced cost, and easy recycling in chemical reactions. In this work, mesoporous SiO2 microspheres were employed as support to immobilize PtNi alloy nanocatalysts with different mass ratios of Pt and Ni (1:0, 3:1, 1:1, 1:3 and 0:1) by a facile in situ one-step reduction in the absence of any capping agent. SEM, EDS, TEM, FTIR, XRD, ICP-AES, XPS and nitrogen adsorption/desorption analysis were employed to systematically investigate the morphology and structure of the obtained SiO2 microspheres and SiO2/PtNi nanocatalysts. Results show that uniform PtNi nanoparticles can be homogeneously and firmly embedded into the surface of SiO2 microspheres. When the as-prepared SiO2/PtNi nanocatalysts were used in the reduction process of p-nitrophenol to p-aminophenol, the nanocatalyst with Pt and Ni mass ratio of 1:3 showed the highest catalytic activity (TOF of 5.35 × 1018 molecules⋅g −1⋅s −1) and could transform p-nitrophenol to p-aminophenol completely within 5 min. The SiO2/PtNi nanocatalyst can also maintain high catalytic activity in the fourth cycle, implying its excellent stability during catalysis.

PtNi was embedded into mesoporous SiO2 surface to avoid its aggregation and loss in catalysis. SiO2/PtNi(1:3) catalyst can be used/reused as efficient catalyst with high activity and stability.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21576247 and 21271158).

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Authors and Affiliations

  1. School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, P.R. China

    HUIJUAN GUAN, CONG CHAO, YANJIE LU, HUISHAN SHANG, YAFEI ZHAO, SIGUO YUAN & BING ZHANG

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  1. HUIJUAN GUAN
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  2. CONG CHAO
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  3. YANJIE LU
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  7. BING ZHANG
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Correspondence to BING ZHANG.

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Supplementary Information (SI)

Additional information pertaining to the time-dependent UV-Vis adsorption spectra changes of p-nitrophenol catalyzed by physically mixed SiO2/Pt and SiO2/Ni are given in Figure S1 S1, available at www.ias.ac.in/chemsci.

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GUAN, H., CHAO, C., LU, Y. et al. PtNi nanoparticles embedded in porous silica microspheres as highly active catalysts for p-nitrophenol hydrogenation to p-aminophenol. J Chem Sci 128, 1355–1365 (2016). https://doi.org/10.1007/s12039-016-1139-4

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  • DOI: https://doi.org/10.1007/s12039-016-1139-4

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