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Effects of Bimesoporous Structure on Surface Acidity and Catalysis of Microspherical MFI Zeolite

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Abstract

Microspherical MFI mesoporous zeolites (MMZ-5) with different mesopore volumes and similar silica-alumina ratios were prepared by the bond-blocking principle and confirmed by physical methods. The zeolite materials with high external surface areas contained inter- and intra-crystalline mesostructures. NH3-TPD and in situ FT-IR spectra techniques were used to characterize the acidic properties of the mesoporous zeolites. The results showed that the Py-Brönsted acid sites of the MMZ-5 samples are very similar to that of the conventional ZSM-5 zeolite, but the latter Py-Lewis acid sites are greatly larger than the former. Further, the concentration of DMPy-Brönsted acid sites in the mesoporous zeolites arrived at 70 μmol/g, namely, the 2,6-dimethylpyridine (DMPy) molecule can probe 97 % of the Py-Brönsted acid sites in the MMZ-5 zeolites. The introduction of the mesoporous structure into the MMZ-5 zeolites increased strongly the accessibility of the more bulky molecules, such as the DTBPy molecules. As expected, HMMZ-5-2 sample as an acid catalyst displayed a high reaction activity and an uniform product selectivity in the benzylation of p-xylene with benzyl chloride.

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Authors and Affiliations

  1. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China

    Haixia Miao, Jinghong Ma, Yan Wang, Yadong Bai & Ruifeng Li

  2. Department of Chemistry, Jincheng Institute of Technology, Jincheng, 048000, China

    Haixia Miao

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  1. Haixia Miao
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  2. Jinghong Ma
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  3. Yan Wang
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  4. Yadong Bai
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  5. Ruifeng Li
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Correspondence to Ruifeng Li.

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Miao, H., Ma, J., Wang, Y. et al. Effects of Bimesoporous Structure on Surface Acidity and Catalysis of Microspherical MFI Zeolite. Catal Lett 144, 1868–1876 (2014). https://doi.org/10.1007/s10562-014-1349-7

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  • DOI: https://doi.org/10.1007/s10562-014-1349-7

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