Hydrothermal synthesis of a continuous zeolite Beta layer by optimization of time, temperature and heating rate of the precursor mixture

M.J.M. Mies, Evgeny Rebrov, J.C. Jansen, M.H.J.M. De Croon, J.C. Schouten

Research output: Contribution to journalArticle

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Abstract

Highly crystalline zeolite Beta coatings in a range of Si/Al ratios of 12-23 were synthesized on a surface-modified molybdenum substrate by hydrothermal synthesis. The average thickness of the coatings was ca. 2 mu m corresponding to a coverage of 2.5 gm(-2). The coatings were obtained from a viscous Na, K, and TEAOH containing aluminosilicate precursor mixture with silica sol as reactive silicon source. A mechanism for the in situ growth of zeolite Beta coatings is proposed. According to this mechanism, the deposition of an amorphous gel layer on the substrate surface in the initial stage of the synthesis is an important step for the crystallization of continuous zeolite Beta coatings. The heating rate of the precursor mixture and the synthesis temperature were optimized to control the level of supersaturation and to stimulate the initial formation of a gel layer. At a Si/Al ratio of 23, fast heating and a temperature of 150 degrees C are required to obtain high coverage, while at a Si/Al ratio of 15, hydrothermal synthesis has to be performed with a slow initial heating rate at 140 degrees C. (c) 2007 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)95-106
Number of pages12
JournalMICROPOROUS AND MESOPOROUS MATERIALS
Volume106
Issue number1-3
DOIs
Publication statusPublished - 01 Nov 2007

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Zeolites
Hydrothermal synthesis
Heating rate
coatings
Coatings
optimization
heating
synthesis
Gels
Temperature
temperature
gels
Molybdenum
Aluminosilicates
Supersaturation
Polymethyl Methacrylate
Silicon
Substrates
Sols
Crystallization

Cite this

Mies, M.J.M. ; Rebrov, Evgeny ; Jansen, J.C. ; De Croon, M.H.J.M. ; Schouten, J.C. / Hydrothermal synthesis of a continuous zeolite Beta layer by optimization of time, temperature and heating rate of the precursor mixture. In: MICROPOROUS AND MESOPOROUS MATERIALS. 2007 ; Vol. 106, No. 1-3. pp. 95-106.
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Hydrothermal synthesis of a continuous zeolite Beta layer by optimization of time, temperature and heating rate of the precursor mixture. / Mies, M.J.M.; Rebrov, Evgeny; Jansen, J.C.; De Croon, M.H.J.M.; Schouten, J.C.

In: MICROPOROUS AND MESOPOROUS MATERIALS, Vol. 106, No. 1-3, 01.11.2007, p. 95-106.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Hydrothermal synthesis of a continuous zeolite Beta layer by optimization of time, temperature and heating rate of the precursor mixture

AU - Mies, M.J.M.

AU - Rebrov, Evgeny

AU - Jansen, J.C.

AU - De Croon, M.H.J.M.

AU - Schouten, J.C.

PY - 2007/11/1

Y1 - 2007/11/1

N2 - Highly crystalline zeolite Beta coatings in a range of Si/Al ratios of 12-23 were synthesized on a surface-modified molybdenum substrate by hydrothermal synthesis. The average thickness of the coatings was ca. 2 mu m corresponding to a coverage of 2.5 gm(-2). The coatings were obtained from a viscous Na, K, and TEAOH containing aluminosilicate precursor mixture with silica sol as reactive silicon source. A mechanism for the in situ growth of zeolite Beta coatings is proposed. According to this mechanism, the deposition of an amorphous gel layer on the substrate surface in the initial stage of the synthesis is an important step for the crystallization of continuous zeolite Beta coatings. The heating rate of the precursor mixture and the synthesis temperature were optimized to control the level of supersaturation and to stimulate the initial formation of a gel layer. At a Si/Al ratio of 23, fast heating and a temperature of 150 degrees C are required to obtain high coverage, while at a Si/Al ratio of 15, hydrothermal synthesis has to be performed with a slow initial heating rate at 140 degrees C. (c) 2007 Elsevier Inc. All rights reserved.

AB - Highly crystalline zeolite Beta coatings in a range of Si/Al ratios of 12-23 were synthesized on a surface-modified molybdenum substrate by hydrothermal synthesis. The average thickness of the coatings was ca. 2 mu m corresponding to a coverage of 2.5 gm(-2). The coatings were obtained from a viscous Na, K, and TEAOH containing aluminosilicate precursor mixture with silica sol as reactive silicon source. A mechanism for the in situ growth of zeolite Beta coatings is proposed. According to this mechanism, the deposition of an amorphous gel layer on the substrate surface in the initial stage of the synthesis is an important step for the crystallization of continuous zeolite Beta coatings. The heating rate of the precursor mixture and the synthesis temperature were optimized to control the level of supersaturation and to stimulate the initial formation of a gel layer. At a Si/Al ratio of 23, fast heating and a temperature of 150 degrees C are required to obtain high coverage, while at a Si/Al ratio of 15, hydrothermal synthesis has to be performed with a slow initial heating rate at 140 degrees C. (c) 2007 Elsevier Inc. All rights reserved.

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M3 - Article

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