DOAJ Open Access 2021

The Effects of Ammonium Hexafluorosilicate Post-Treatment on the Acidity of H-ZSM-5 Zeolite Studied by Solid-State NMR Spectroscopy

Yong-xiang WANG Qiang WANG Jun XU Qing-hua XIA Feng DENG

Abstrak

In this study, solid-state nuclear magnetic resonance (NMR) spectroscopy was used to probe the changes of acidity of H-ZSM-5 zeolite caused by ammonium hexafluorosilicate (AHFS) washing-related changes of aluminium species. It was observed that the four-coordinate framework aluminum species with Brønsted acidity were partially reduced, while the tri-coordinated framework aluminum with Lewis acidity was slightly decreased after the AHFS treatment. However, AHFS washing was also found to induce mild dealumination and a significant reduction of aluminum species with Lewis acidity containing Al-OH group on zeolites, thus resulting in a remarkable change in the overall acidity of the zeolites.

Topik & Kata Kunci

Electricity and magnetism

Penulis (5)

Yong-xiang WANG

Qiang WANG

Jun XU

Qing-hua XIA

Feng DENG

Format Sitasi

APA MLA BibTeX

WANG, Y., WANG, Q., XU, J., XIA, Q., DENG, F. (2021). The Effects of Ammonium Hexafluorosilicate Post-Treatment on the Acidity of H-ZSM-5 Zeolite Studied by Solid-State NMR Spectroscopy. https://doi.org/10.11938/cjmr20212927

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Informasi Jurnal

Tahun Terbit: 2021
Sumber Database: DOAJ
DOI: 10.11938/cjmr20212927
Akses: Open Access ✓