Aluminium distribution in the bulk and on the surface of Y zeolites dealuminated with SiCl4 vapour. Influence of conditions of dealumination

Ludmila Kubelková, Lydie Dudíková, Zdenek Bastl, Borbély G. Páł, Hermann K. Beyer

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Abstract

Zeolites Y, dealuminated by reaction with SiCl4 at 530 and 630 K followed by washing with water, ethanol or ethanol and buffer before ammonium exchange (resulting Si/Al ratio: 3.8-10.6), have been examined using X-ray photoelectron spectroscopic measurements combined with chemical analysis. Subsequent extraction with H2Na2 EDTA allowed preferential removal of non-framework Al species which helped in the discussion of the Al location. It was found that, besides the increase of reaction temperature, the efficiency of washing (water > ethanol > ethanol and buffer) increases the Si/Al ratio both in the bulk and on the surface. Temperature increase and milder washing enhance the Al-enrichment of the surface with respect to the bulk. Non-framework Al species are responsible for the surface enrichment.

Original languageEnglish
Pages (from-to)511-516
Number of pages6
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical chemistry in Condensed Phases
Volume83
Issue number2
DOIs
Publication statusPublished - 1987

Fingerprint

Zeolites
Aluminum
zeolites
washing
ethyl alcohol
Ethanol
Vapors
Washing
vapors
aluminum
Buffers
buffers
Water
ethylenediaminetetraacetic acids
Photoelectrons
chemical analysis
Ammonium Compounds
Edetic Acid
water
photoelectrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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abstract = "Zeolites Y, dealuminated by reaction with SiCl4 at 530 and 630 K followed by washing with water, ethanol or ethanol and buffer before ammonium exchange (resulting Si/Al ratio: 3.8-10.6), have been examined using X-ray photoelectron spectroscopic measurements combined with chemical analysis. Subsequent extraction with H2Na2 EDTA allowed preferential removal of non-framework Al species which helped in the discussion of the Al location. It was found that, besides the increase of reaction temperature, the efficiency of washing (water > ethanol > ethanol and buffer) increases the Si/Al ratio both in the bulk and on the surface. Temperature increase and milder washing enhance the Al-enrichment of the surface with respect to the bulk. Non-framework Al species are responsible for the surface enrichment.",
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TY - JOUR

T1 - Aluminium distribution in the bulk and on the surface of Y zeolites dealuminated with SiCl4 vapour. Influence of conditions of dealumination

AU - Kubelková, Ludmila

AU - Dudíková, Lydie

AU - Bastl, Zdenek

AU - Páł, Borbély G.

AU - Beyer, Hermann K.

PY - 1987

Y1 - 1987

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