期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 187, 期 -, 页码 7-13出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2013.12.007
关键词
Heteropolyacid; Mesoporous SBA-15; Acidic catalysis; Catalysis stability
类别
资金
- National Natural Science Foundation of China [21306023, 21376051, 21106017, 51077013]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China [BA2011086]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100092120047]
- Key Program for the Scientific Research Guiding Found of Basic Scientific Research Operation Expenditure of Southeast University [3207043101]
- Southeast University
The Keggin phosphotungstic acid, H3PW12O40 (HPW) incorporated into SBA-15 ordered mesoporous silica were synthesized via a method involving the introduction of HPW in an acidified solution of P123 triblock copolymer (EO20PO70EO20), the SBA-15 mesostructuring agent (direct synthesis). Samples with similar HPW loadings were also prepared by impregnation of SBA-15. A comparison between direct incorporation of HPW into mesoporous silica and impregnation of HPW on mesoporous silica was done. Characterization by elemental analysis, XRD, N-2 adsorption, TEM, DRS-UV and FTIR spectroscopy showed that after calcination HPW in the direct synthesized samples was better dispersed or may even be partially embedded in the pore walls. Moreover, their catalytic behaviors were investigated in the alkylation of o-xylene with styrene. Results show that direct synthesized sample has the better catalytic performances in terms of yield and stability. This behavior may be owing to high dispersion of the HPW species on the SBA-15 and the strong interaction between the HPW and the support, thus prevent HPW leaching from the support. (C) 2013 Elsevier Inc. All rights reserved.
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