| Quantitative measurement of the Brönsted acid sites in solid acids: toward a single-site design of Mo-modified ZSM-5 zeolite. | |
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MedLine Citation:
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PMID: 16722744 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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On the basis of our previous H/D exchange studies devoted to the quantification of the number of Brönsted acid sites in solid acids, we report here an innovative approach to determine both the amount and the localization of Mo atoms inside the Mo/ZSM-5 catalyst, commonly used for the methane dehydroaromatization reaction. The influence of Mo introduction in the MFI framework was studied by means of BET, X-ray diffraction, 27Al magic angle spinning NMR, NH3 temperature-programmed desorption, and H/D isotopic exchange techniques. A dependence was found between the decrease of acidic OH groups and the Mo content. Depending on the Si/Al ratio of the zeolite, i.e., the proximity of two Brönsted acid sites, the Mo atoms substitute a different number of OH groups. Consequently, a chemical structure was proposed to describe the geometry of the Mo complex in the channels of the ZSM-5 zeolite. |
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Authors:
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Jean-Philippe Tessonnier; Benoît Louis; Stephane Walspurger; Jean Sommer; Marc-Jacques Ledoux; Cuong Pham-Huu |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 110 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2006 Jun |
Date Detail:
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Created Date: 2006-05-25 Completed Date: 2007-07-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 10390-5 Citation Subset: - |
Affiliation:
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Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse (LMSPC, UMR 7515 du CNRS), ECPM-ULP, 25, rue Becquerel, F-67087 Strasbourg Cedex 2, France. |
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