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Acidic and basic surface sites of zirconia-based biomass gasification gas clean-up catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42702 45937 2009 9 PDF Available
Title
Acidic and basic surface sites of zirconia-based biomass gasification gas clean-up catalysts
Abstract

The surface structures of ZrO2, Y2O3–ZrO2 and SiO2–ZrO2 catalysts were studied in relation to their basicity and acidity, and the relationship between surface structure and gasification gas clean-up activity was evaluated. The physical properties of the catalysts were characterized by BET, XRD and Raman spectroscopy. The basicity and acidity of the catalysts were measured by CO2-TPD and NH3-TPD, respectively. The types of active surface sites were determined by in situ DRIFTS experiments for the adsorption and desorption of CO2. The order of activity of the catalysts in the decomposition of tar from synthetic gasification gas was ZrO2 > Y2O3–ZrO2 > SiO2–ZrO2. Acidity was observed to be an unfavorable characteristic for ZrO2-based gas clean-up catalysts, whereas basicity seems to be essential. The redox properties of Y2O3–ZrO2 enhance its overall oxidation activity and the lower performance of Y2O3–ZrO2 in tar decomposition compared to ZrO2 can be explained by its oxidation activity towards other gas compounds than tar.

Graphical abstractThe relationship between surface structure of ZrO2-based catalysts and gasification gas clean-up activity was studied. The order of activity was ZrO2 > Y2O3–ZrO2 > SiO2–ZrO2. Acidity was observed to be an unfavorable characteristic for ZrO2-based gas clean-up catalysts, whereas basicity seemed to be essential. The redox properties of Y2O3–ZrO2 enhanced its oxidation activity towards other gas compounds than tar. On ZrO2 the surface lattice oxygen coordinated by Zr4+ ion (figure) was related to the tar oxidation activity of ZrO2.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Zirconia; Gasification gas clean-up; Characterization of surface sites
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Acidic and basic surface sites of zirconia-based biomass gasification gas clean-up catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 362, Issues 1–2, 30 June 2009, Pages 169–177
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us