skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: One-step synthesis of hydrothermally stable mesoporous aluminosilicates with strong acidity

Abstract

Using tetraethylorthosilicate (TEOS), polymethylhydrosiloxane (PMHS) and aluminium isopropoxide (AIP) as the reactants, through a one-step nonsurfactant route based on PMHS-TEOS-AIP co-polycondensation, hydrothermally stable mesoporous aluminosilicates with different Si/Al molar ratios were successfully prepared. All samples exclusively showed narrow pore size distribution centered at 3.6 nm. To assess the hydrothermal stability, samples were subjected to 100 deg. C distilled water for 300 h. The boiled mesoporous aluminosilicates have nearly the same N{sub 2} adsorption-desorption isotherms and the same pore size distributions as those newly synthesized ones, indicating excellent hydrothermal stability. The {sup 29}Si MAS NMR spectra confirmed that PMHS and TEOS have jointly condensed and CH{sub 3} groups have been introduced into the materials. The {sup 27}Al MAS NMR spectra indicated that Al atoms have been incorporated in the mesopore frameworks. The NH{sub 3} temperature-programmed desorption showed strong acidity. Due to the existence of large amount of CH{sub 3} groups, the mesoporous aluminosilicates obtained good hydrophobicity. Owing to the relatively large pore and the strong acidity provided by the uniform four-coordinated Al atoms, the excellent catalytic performance for 1,3,5-triisopropylbenzene cracking was acquired easily. The materials may be a profitable complement for the synthesis of solid acid catalysts. - Graphical abstract: Basedmore » on the nonsurfactant method, a facile one-step synthesis route has been developed to prepare methyl-modified mesoporous aluminosilicates that possessed hydrothermal stability and strong acidity.« less

Authors:
 [1];  [2];  [3]; ;  [1]
  1. Chinese Academy of Sciences, State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Taiyuan 030001 (China)
  2. (Australia)
  3. Chinese Academy of Sciences, State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Taiyuan 030001 (China), E-mail: xuyao@sxicc.ac.cn
Publication Date:
OSTI Identifier:
21128461
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 181; Journal Issue: 9; Other Information: DOI: 10.1016/j.jssc.2008.05.046; PII: S0022-4596(08)00280-6; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; ALUMINIUM COMPOUNDS; AMMONIA; DESORPTION; HYDROTHERMAL SYNTHESIS; NMR SPECTRA; PH VALUE; SILICATES; STABILITY

Citation Formats

Yang Dongjiang, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, QLD 4001, Xu Yao, Wu Dong, and Sun Yuhan. One-step synthesis of hydrothermally stable mesoporous aluminosilicates with strong acidity. United States: N. p., 2008. Web. doi:10.1016/j.jssc.2008.05.046.
Yang Dongjiang, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, QLD 4001, Xu Yao, Wu Dong, & Sun Yuhan. One-step synthesis of hydrothermally stable mesoporous aluminosilicates with strong acidity. United States. doi:10.1016/j.jssc.2008.05.046.
Yang Dongjiang, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, QLD 4001, Xu Yao, Wu Dong, and Sun Yuhan. Mon . "One-step synthesis of hydrothermally stable mesoporous aluminosilicates with strong acidity". United States. doi:10.1016/j.jssc.2008.05.046.
@article{osti_21128461,
title = {One-step synthesis of hydrothermally stable mesoporous aluminosilicates with strong acidity},
author = {Yang Dongjiang and School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, QLD 4001 and Xu Yao and Wu Dong and Sun Yuhan},
abstractNote = {Using tetraethylorthosilicate (TEOS), polymethylhydrosiloxane (PMHS) and aluminium isopropoxide (AIP) as the reactants, through a one-step nonsurfactant route based on PMHS-TEOS-AIP co-polycondensation, hydrothermally stable mesoporous aluminosilicates with different Si/Al molar ratios were successfully prepared. All samples exclusively showed narrow pore size distribution centered at 3.6 nm. To assess the hydrothermal stability, samples were subjected to 100 deg. C distilled water for 300 h. The boiled mesoporous aluminosilicates have nearly the same N{sub 2} adsorption-desorption isotherms and the same pore size distributions as those newly synthesized ones, indicating excellent hydrothermal stability. The {sup 29}Si MAS NMR spectra confirmed that PMHS and TEOS have jointly condensed and CH{sub 3} groups have been introduced into the materials. The {sup 27}Al MAS NMR spectra indicated that Al atoms have been incorporated in the mesopore frameworks. The NH{sub 3} temperature-programmed desorption showed strong acidity. Due to the existence of large amount of CH{sub 3} groups, the mesoporous aluminosilicates obtained good hydrophobicity. Owing to the relatively large pore and the strong acidity provided by the uniform four-coordinated Al atoms, the excellent catalytic performance for 1,3,5-triisopropylbenzene cracking was acquired easily. The materials may be a profitable complement for the synthesis of solid acid catalysts. - Graphical abstract: Based on the nonsurfactant method, a facile one-step synthesis route has been developed to prepare methyl-modified mesoporous aluminosilicates that possessed hydrothermal stability and strong acidity.},
doi = {10.1016/j.jssc.2008.05.046},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 9,
volume = 181,
place = {United States},
year = {2008},
month = {9}
}