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Abstract <p>The paper describes the physicochemical characterization and catalytic testing of MFI zeolites (both parent and P-modified) with crystal sizes varying from 0.15 to 6 μm. Their physicochemical properties were examined by X-ray diffraction analysis, X-ray fluorescence analysis, scanning electron microscopy, low-temperature nitrogen adsorption, IR spectroscopy, and <sup>27</sup>Al and <sup>31</sup>P MAS NMR spectroscopy. Both the parent and P-modified MFI zeolites were then tested in toluene disproportionation. In the case of parent zeolites, a 15-fold reduction in the crystal size doubles toluene conversion but has no effect on <i>p</i>-selectivity. Phosphorus modification reduces the concentration of acid sites in the samples. In this case, increasing the crystal size to 3–6 μm enhances the <i>p</i>-selectivity up to 78.2%.</p>

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Effect of MFI Zeolite Crystal Size on Its Catalytic Performance in Toluene Disproportionation

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • D. O. Bachurina,
  • O. A. Ponomareva,
  • A. P. Dubtsova,
  • I. I. Ivanova

摘要

Abstract

The paper describes the physicochemical characterization and catalytic testing of MFI zeolites (both parent and P-modified) with crystal sizes varying from 0.15 to 6 μm. Their physicochemical properties were examined by X-ray diffraction analysis, X-ray fluorescence analysis, scanning electron microscopy, low-temperature nitrogen adsorption, IR spectroscopy, and 27Al and 31P MAS NMR spectroscopy. Both the parent and P-modified MFI zeolites were then tested in toluene disproportionation. In the case of parent zeolites, a 15-fold reduction in the crystal size doubles toluene conversion but has no effect on p-selectivity. Phosphorus modification reduces the concentration of acid sites in the samples. In this case, increasing the crystal size to 3–6 μm enhances the p-selectivity up to 78.2%.