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  Acid sites on silica-supported molybdenum oxides probed by ammonia adsorbtion: Experiment and theory

Arnakawa, K., Wang, Y., Kroehnert, J., Schlögl, R., & Trunschke, A. (2019). Acid sites on silica-supported molybdenum oxides probed by ammonia adsorbtion: Experiment and theory. Molecular Catalysis, 478: UNSP 110580. doi:10.1016/j.mcat.2019.110580.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A91F-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-A920-8
Genre: Journal Article

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 Creators:
Arnakawa, Kazuhik, Author
Wang, Yuanqing, Author
Kroehnert, Jutta, Author
Schlögl, Robert1, Author              
Trunschke, Annette, Author
Affiliations:
1Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023874              

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 Abstract: The origin of Brdnsted acidity in a series of silica-supported molybdenum oxide catalysts with Mo loadings of 2.1-13.3 wt%, and apparent Mo surface densities of 0.2-2.5 nm(-2), respectively, was analyzed by ammonia adsorption investigated by temperature-programmed desorption, infrared spectroscopy, and DFT calculations. Every surface molybdenum atom in the molybdenum oxide (sub-)monolayer is involved in the interaction with ammonia, either as Lewis or as Bronsted acid site. A model is proposed that ascribes Bronsted acidity to the interaction between silanol groups and adjacent surface molybdate species under formation of pseudo-bridging Si-O(H)-Mo(=O)(2) species with a Mo-O(Si) distance of 2.1 angstrom and a N-H(OSi) distance of < 1.1 angstrom in the formed adsorption complex of the ammonia molecule. The combined experimental and computational study contributes to an improved fundamental understanding of acidity in amorphous mixed metal oxides.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Molecular Catalysis
  Abbreviation : Mol Catal
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 478 Sequence Number: UNSP 110580 Start / End Page: - Identifier: ISSN: 2468-8231
CoNE: https://pure.mpg.de/cone/journals/resource/2468-8231