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  Effect of gold oxidation state on the epoxidation and hydrogenation of propylene on Au/TS-1

Gaudet, J., Bondo, K. K., Song, Z., Fujitani, T., Zhang, W., Su, D. S., et al. (2011). Effect of gold oxidation state on the epoxidation and hydrogenation of propylene on Au/TS-1. Journal of Catalysis, 280(1), 40-49. doi:10.1016/j.jcat.2011.03.001.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-3BD1-8 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-3BD2-6
Genre: Journal Article

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 Creators:
Gaudet, Jason1, Author
Bondo, Kyoko K.2, Author
Song, Zhaoxia3, 4, Author
Fujitani, Tadahiro3, Author
Zhang, Wei5, Author           
Su, Dang Sheng5, Author           
Oyama, S. Ted6, Author
Affiliations:
1Environmental Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering (0211), Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA, ou_persistent22              
2Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan, ou_persistent22              
3Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan, ou_persistent22              
4Department of Chemical Engineering, College of Life Science, Dalian Nationalities University, Dalian 116600, China, ou_persistent22              
5Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
6Department of Chemical Systems Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan, ou_persistent22              

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Free keywords: Gold; Particle size; Oxidation state; Cyanide; XANES; EXAFS; Propylene; Hydrogenation; Propylene oxide
 Abstract: Gold nanoparticles on titanium oxide and titania-silica supports are active for the formation of propylene oxide by the oxidation of propylene with hydrogen and oxygen mixtures. Cyanide treatment of gold supported on titanosilicate zeolite supports (Au/TS-1) yielded unexpected results. Catalysts treated with weak solutions of sodium cyanide resulted in preferential removal of small gold particles, while catalysts treated with strong solutions resulted in dissolution of the gold and re-precipitation as gold (+1) cyanide. X-ray absorption spectroscopy demonstrated that catalysts that produce propylene oxide in the presence of hydrogen and oxygen mixtures had supported gold (+3) oxide nanoparticles of 3 nm size after synthesis, which were reduced to gold metal at reaction conditions. Samples treated with strong solutions of sodium cyanide resulted in supported gold (+1) cyanide particles of large size, 9–11 nm. These particles did not produce propylene oxide but, surprisingly, showed high selectivity toward propylene hydrogenation. Increasing gold (+1) cyanide particle size resulted in a decrease in hydrogenation activity.

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Language(s): eng - English
 Dates: 2011-04-122011-05-16
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jcat.2011.03.001
 Degree: -

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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: San Diego, CA. : Academic Press
Pages: - Volume / Issue: 280 (1) Sequence Number: - Start / End Page: 40 - 49 Identifier: ISSN: 0021-9517
CoNE: https://pure.mpg.de/cone/journals/resource/954922645027