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Consecutive interlayer disassembly-reassembly during alumination of UOV zeolite: insight into the mechanism

Abstract

Investigation of kinetics of the UOV germanosilicate alumination by X-ray diffraction, 27Al and 29Si MAS NMR, ICP/OES and FTIR spectroscopy showed the multi-stage mechanism of the process. The first step consists of degermanation and partial disassembly followed by Al incorporation into UOV germanosilicate framework in the second step. Al atoms stabilize the UOV framework by healing the defects formed after rapid hydrolysis of Ge–O–Si bonds, which was evidenced by comparison with the reference treatment of initial UOV samples with HNO3 (pH=2). Post-synthesis alumination of UOV leads to generation of strong Brønsted and Lewis acid sites; their ratio in aluminated UOV derivatives can be adjusted by the variation of treatment conditions. Intrinsic properties of parent UOV germanosilicates determine the textural properties of aluminated derivatives.

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Publication details

The article was received on 08 Jul 2017, accepted on 02 Oct 2017 and first published on 03 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA05935C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Consecutive interlayer disassembly-reassembly during alumination of UOV zeolite: insight into the mechanism

    V. Kasneryk, M. Opanasenko, M. Shamzhy, Z. Musilova, Y. Avadhut, M. Hartmann and J. Cejka, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05935C

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