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Au/PO43−/TiO2 and PO43−/Au/TiO2 catalysts for CO oxidation: Effect of synthesis details on catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
44152 46005 2007 12 PDF Available
Title
Au/PO43−/TiO2 and PO43−/Au/TiO2 catalysts for CO oxidation: Effect of synthesis details on catalytic performance
Abstract

Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO2 synthesized via two routes. In route I, Au/PO43−/TiO2 catalysts were prepared by treating TiO2 (Degussa P25) with diluted H3PO4, followed by loading gold via deposition-precipitation. In route II, PO43−/Au/TiO2 catalysts were prepared by treating H2-reduced Au/TiO2 with diluted H3PO4. These catalysts were systematically pretreated at 200 or 500 °C before reaction testing. The overall CO conversion on 200 °C-pretreated Au/PO43−/TiO2 or PO43−/Au/TiO2 was always lower than that on 200 °C-pretreated Au/TiO2. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO43−/TiO2 and PO43−/Au/TiO2 pretreated at 500 °C retained significant activities at room temperature, whereas 500 °C-pretreated Au/TiO2 lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.

Graphical abstractGold supported on titania (Au/TiO2) is a highly active catalyst for low-temperature CO oxidation, but high-temperature deactivation is a shortcoming that may constrain its use in car-emission control and organic combustion. Here, we attempted to address this problem using phosphate-doped Au/TiO2. Control experiments were performed to obtain an explicit picture on the impact of synthesis details.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Gold catalysis; CO oxidation; Titania; Phosphate; Dopant; Sintering; Deactivation
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Au/PO43−/TiO2 and PO43−/Au/TiO2 catalysts for CO oxidation: Effect of synthesis details on catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 327, Issue 2, 15 August 2007, Pages 226–237
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
Online Support
Any Questions? feel free to contact us