NDLI: Generation of basic centers in high-silica zeolites and their application in gas-phase upgrading of bio-oil.

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Generation of basic centers in high-silica zeolites and their application in gas-phase upgrading of bio-oil.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Keller, Tobias C. Rodrigues, Elodie G. Pérez-Ramírez, Javier
Description	Author Affiliation: Keller TC ( Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich (Switzerland), Fax: (+41) 44-6331405.)
Abstract	High-silica zeolites have been reported recently as efficient catalysts for liquid- and gas-phase condensation reactions because of the presence of a complementary source of basicity compared to Al-rich basic zeolites. Herein, we describe the controlled generation of these active sites on silica-rich FAU, BEA, and MFI zeolites. Through the application of a mild base treatment in aqueous Na2CO3, alkali-metal-coordinating defects are generated within the zeolite whereas the porous properties are fully preserved. The resulting catalysts were applied in the gas-phase condensation of propanal at 673âK as a model reaction for the catalytic upgrading of pyrolysis oil, for which an up to 20-fold increased activity compared to the unmodified zeolites was attained. The moderate basicity of these new sites leads to a coke resistance superior to traditional base catalysts such as CsX and MgO, and comparable activity and excellent selectivity is achieved for the condensation pathways. Through strategic acid and base treatments and the use of magic-angle spinning NMR spectroscopy, the nature of the active sites was investigated, which supports the theory of siloxy sites as basic centers. This contribution represents a key step in the understanding and design of high-silica base catalysts for the intermediate deoxygenation of crude bio-oil prior to the hydrotreating step for the production of second-generation biofuels.
File Format	HTM / HTML
ISSN	18645631
Issue Number	6
Volume Number	7
e-ISSN	1864564X
Journal	ChemSusChem
Language	English
Publisher	Wiley-VCH
Publisher Date	2014-06-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gases Lignin Research Support, Non-u.s. Gov't Chemistry Oils Silicon Dioxide Discipline Sustainable Chemistry Catalysis Biofuels Zeolites Journal Article
Content Type	Text
Resource Type	Article
Subject	Energy Environmental Chemistry Materials Science Chemical Engineering

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Generation of basic centers in high-silica zeolites and their application in gas-phase upgrading of bio-oil.

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