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<p>In this work, the analysis and generalization of data on the elemental, phase and surface composition, crystal structure and microstructure of MFI-type HZSM-5 with Si/Al = 12, 25, 40, 300 were presented. Relationships between the composition of zeolite in HZSM-5 samples with different Si/Al and pore volume, specific surface, and framework voids area were established. Data obtained by electron microscopy and energy dispersive X-ray microanalysis explained the discrepancy between HZSM-5 real composition and the initial (as synthesized) one. Samples with the maximum content of Brønsted (HZSM-5 with Si/Al = 25) and Lewis (HZSM-5 with Si/Al = 12) acid sites responsible for the catalytic activity were identified using diffuse reflectance Fourier transform infrared spectroscopy. N<sub>2</sub>O decomposition reaction rate was found to decrease in the row HZSM-5(25) &gt; HZSM-5(12) &gt; HZSM-5(40) &gt; HZSM-5(40)C &gt; &gt; HZSM-5(300). The high N<sub>2</sub>O decomposition rate demonstrated by HZSM-5(25) makes it promising catalyst. The second phase of iron oxides, found in all studied HZSM-5 as an impurity of the initial components, and the presence of faceted particles {001} oriented in HZSM-5(25) were shown to contribute to its maximum catalytic activity in N<sub>2</sub>O decomposition. The applied methodology for studying aluminosilicalites with different silicon to aluminum ratio and the revealed correlations can provide a fundamental perspective in studying other zeolites.</p>

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Methodological aspects of producing aluminosilicalites with typological structure of HZSM-5. Rational design and catalytic properties

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Elena Domoroshchina,
  • Galina Kuz’micheva,
  • Alexander Vasiliev,
  • Ivan Pavlov,
  • Larisa Pirutko,
  • Olga Tkachenko,
  • Alexander Kustov

摘要

In this work, the analysis and generalization of data on the elemental, phase and surface composition, crystal structure and microstructure of MFI-type HZSM-5 with Si/Al = 12, 25, 40, 300 were presented. Relationships between the composition of zeolite in HZSM-5 samples with different Si/Al and pore volume, specific surface, and framework voids area were established. Data obtained by electron microscopy and energy dispersive X-ray microanalysis explained the discrepancy between HZSM-5 real composition and the initial (as synthesized) one. Samples with the maximum content of Brønsted (HZSM-5 with Si/Al = 25) and Lewis (HZSM-5 with Si/Al = 12) acid sites responsible for the catalytic activity were identified using diffuse reflectance Fourier transform infrared spectroscopy. N2O decomposition reaction rate was found to decrease in the row HZSM-5(25) > HZSM-5(12) > HZSM-5(40) > HZSM-5(40)C > > HZSM-5(300). The high N2O decomposition rate demonstrated by HZSM-5(25) makes it promising catalyst. The second phase of iron oxides, found in all studied HZSM-5 as an impurity of the initial components, and the presence of faceted particles {001} oriented in HZSM-5(25) were shown to contribute to its maximum catalytic activity in N2O decomposition. The applied methodology for studying aluminosilicalites with different silicon to aluminum ratio and the revealed correlations can provide a fundamental perspective in studying other zeolites.