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Dealumination of Zeolite Frameworks and Lewis Acid Catalyst Activation for Transfer Hydrogenation

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Abstract

This study examines a selective removal of Al metal from Al-Beta (BEA), Al-Faujasite (FAU, type Y) and Al-Mordenite (MOR) whose frameworks have high and close Si/Al ratios ≥ 30. Dealumination was performed using acid leaching (nitric acid, 13 M) solution at 100 °C for 20 h. Unlike Al-BEA, Al-FAU and Al-MOR were hardly dealuminated for their ultra-stable structure. Solid-state incorporation (SSI) method was applied to incorporate Lewis acidic Sn metal in dealuminated zeolitic frameworks. Newly formed zeolites have numerous vacant tetrahedral sites with a siliceous-rich framework. These zeolites were characterized by powder XRD, elemental analysis, N2 sorption, DRIFT and 27Al MAS NMR spectroscopies. Meerwein–Ponndorf–Verley (MPV) was selected as a reaction to assess the catalytic performance of prepared zeolites. While SSI-Sn-BEA exhibited superior catalytic activity for the presence of Lewis acid-Sn, FAU and MOR showed less catalytic activity due to their confined structural effects, presence of silanol nest and inadequate Sn incorporation.

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Acknowledgements

The authors express their sincere thanks to The University Al-Qadisiyah, Iraq, for the financial support to complete a part of the work, and they are grateful for all guidance introduced by the department of chemistry members at the University of Al-Qadisiyah.

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Authors and Affiliations

  1. Department of Chemistry, University of Al-Qadisiyah, Al Diwaniyah, Iraq

    Abbas Al-Nayili & Nahla Salman

  2. Department of Materials Engineering, University of Al-Qadisiyah, Al Diwaniyah, Iraq

    Mushtaq Albdiry

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  1. Abbas Al-Nayili
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  2. Mushtaq Albdiry
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  3. Nahla Salman
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Correspondence to Abbas Al-Nayili.

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Al-Nayili, A., Albdiry, M. & Salman, N. Dealumination of Zeolite Frameworks and Lewis Acid Catalyst Activation for Transfer Hydrogenation. Arab J Sci Eng 46, 5709–5716 (2021). https://doi.org/10.1007/s13369-020-05312-w

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  • DOI: https://doi.org/10.1007/s13369-020-05312-w

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