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Role of the Aluminophosphate Gel Aging Stage in Controlling the Morphology and Secondary Pore Structure of AlPO4-11 Molecular Sieves

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Abstract

The effect of the aging stage on the chemical and phase composition and pore structure characteristics of aluminophosphate gels synthesized using boehmite and phosphoric acid and the products of the subsequent crystallization of the gels into aluminophosphate AlPO4-11 has been studied by XRD, 27Al and 31P MAS NMR, SEM, and nitrogen adsorption–desorption. It has been shown that the control of the chemical and phase composition of aluminophosphate gels via varying their aging temperature in a range of 25–120°C makes it possible to synthesize a high phase purity AlPO4-11 aluminophosphate and change the morphology and secondary pore structure characteristics of the AlPO4-11 crystals without using various growth modifiers.

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Funding

This work was performed under a state task to Institute of Petrochemistry and Catalysis of the Ural Federal Research Center of the Russian Academy of Sciences (subject no. FMRS-2022-0080) and supported by a Scholarship of the President of the Russian Federation for Supporting Young Scientists and Postgraduate Students (SP-3341.2021.1). The structural studies were conducted at the Agidel Regional Center for collective use of the Ural Federal Research Center of the Russian Academy of Sciences under a state task to Institute of Petrochemistry and Catalysis of the Ural Federal Research Center of the Russian Academy of Sciences (subject no. FMRS-2022-0081). The MAS NMR spectroscopy studies were supported by a grant from the Russian Science Foundation (project no. 20-13-00203) and performed at Moscow State University.

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Authors and Affiliations

  1. Institute of Petrochemistry and Catalysis, Ufa Federal Research Center, Russian Academy of Sciences, 450075, Ufa, Republic of Bashkortostan, Russia

    M. R. Agliullin, A. V. Faizullin, E. S. Meshcheryakova & B. I. Kutepov

  2. Faculty of Chemistry, Moscow State University, 119991, Moscow, Russia

    Yu. G. Kolyagin

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  1. M. R. Agliullin
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  2. Yu. G. Kolyagin
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  3. A. V. Faizullin
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  4. E. S. Meshcheryakova
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  5. B. I. Kutepov
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Correspondence to M. R. Agliullin.

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Translated by M. Timoshinina

Abbreviations and notation: XRD, X-ray diffraction analysis; MAS NMR, magic angle spinning nuclear magnetic resonance spectroscopy, FE–SEM, field emission scanning electron microscopy

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Agliullin, M.R., Kolyagin, Y.G., Faizullin, A.V. et al. Role of the Aluminophosphate Gel Aging Stage in Controlling the Morphology and Secondary Pore Structure of AlPO4-11 Molecular Sieves. Kinet Catal 63, 606–613 (2022). https://doi.org/10.1134/S0023158422050019

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  • DOI: https://doi.org/10.1134/S0023158422050019

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