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Selective Crystallization of Aluminophosphate Molecular Sieves with an AEL Structure

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Abstract

The effect of the temperature and exposure time of the starting aluminophosphate gels on their chemical and phase composition was studied. When the source of aluminum is its hydrated oxide (boehmite), gels with different contents of ammonium phosphate, undissolved boehmite, and amorphous aluminophosphate can be formed. The formation of a gel with dominant amorphous aluminophosphate allows selective crystallization of AlPO4-11 of high phase purity and ~100% crystallinity. The developed procedure for the preparation of highly dispersed aluminophosphate AlPO4-11 molecular sieves with these properties allows a transition to crystallization of silicoaluminophosphates SAPO-11—promising domestic catalysts for industrial hydroisomerization of n-paraffins in the production of Arctic diesel fuels and group III oils and isomerization of butenes.

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ACKNOWLEDGMENTS

The reported study was funded by RFBR according to the research project no. 18-33-00077 mol_a.

The obtained materials were analyzed using the equipment of the Agidel Multiaccess Center at the Institute of Petrochemistry and Catalysis, Russian Academy of Sciences.

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Correspondence to M. R. Agliullin.

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Translated by L. Smolina

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Agliullin, M.R., Khairullina, Z.R., Faizullin, A.V. et al. Selective Crystallization of Aluminophosphate Molecular Sieves with an AEL Structure. Catal. Ind. 11, 1–6 (2019). https://doi.org/10.1134/S2070050419010021

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