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Enhanced performances in catalytic oxidation of o-xylene over hierarchical macro-/mesoporous silica-supported palladium catalysts

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Abstract

A series of hierarchical macro-/mesoporous silica supports (MMSs) were successfully synthesized using dual-templating technique employing polystyrene (PS) spheres and the Pluronic P123 surfactant. Pd was next loaded on the hierarchical silica supports via colloids precipitation method. Physicochemical properties of the synthesized samples were characterized by various techniques and all catalysts were tested for the total oxidation of o-xylene. Among them, the Pd/MMS-b catalyst with tetraethoxysilane/polystyrene weight ratio of 1.0 exhibited superior catalytic activity, and under a higher gas hourly space velocity (GHSV) of 70000 h–1, the 90% conversion of o-xylene has been obtained at around 200°C. The BET and SEM results indicated that Pd/MMSb catalyst possesses high surface area and large pore volume, and well-ordered, interconnected macropores and 2D hexagonally mesopores hybrid network. This novel ordered hierarchical porous structure was highly beneficial to the dispersion of active sites Pd nanoparticles with less aggregation, and facilitates diffusion of reactants and products. Furthermore, the Pd/MMS-b catalyst possessed good stability and durability.

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Authors and Affiliations

  1. Department of Environmental Nano-materials and Technologies, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

    Nanli Qiao, Xin Zhang, Yang Li, Zhongshen Zhang, Jie Cheng & Zhengping Hao

  2. Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xian, 710049, China

    Chi He

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  1. Nanli Qiao
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  2. Xin Zhang
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  3. Chi He
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  4. Yang Li
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  5. Zhongshen Zhang
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Correspondence to Zhengping Hao.

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Qiao, N., Zhang, X., He, C. et al. Enhanced performances in catalytic oxidation of o-xylene over hierarchical macro-/mesoporous silica-supported palladium catalysts. Front. Environ. Sci. Eng. 10, 458–466 (2016). https://doi.org/10.1007/s11783-015-0802-1

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  • DOI: https://doi.org/10.1007/s11783-015-0802-1

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