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The support effect in oxidizing atmosphere on propane combustion over platinum supported on TiO2, TiO2–SiO2 and TiO2–SiO2–WO3

Paper ID Volume ID Publish Year Pages File Format Full-Text
49051 46543 2007 7 PDF Available
Title
The support effect in oxidizing atmosphere on propane combustion over platinum supported on TiO2, TiO2–SiO2 and TiO2–SiO2–WO3
Abstract

The platinum catalyst supported on TiO2–SiO2–WO3, TiO2–SiO2 and TiO2 was studied with respect to the support effect in the oxidizing atmosphere on propane combustion. The catalysts and supports were characterized by using BET, XPS, IR, acidity measurement by the titration method and pulsed CO chemisorption. Although for the reduction-pretreated catalyst, the propane combustion activity is slightly changed with the support materials, for the oxidation-pretreated catalyst it significantly varies with the support materials and increases in the order of Pt/TiO2 < Pt/TiO2–SiO2 < Pt/TiO2–SiO2–WO3, indicating that the Pt/TiO2–SiO2–WO3 catalyst exhibits the most superior catalytic performance. In agreement with this order, the acidity at fairly strong acid strengths, particularly Brønsted acidity of the corresponding support is enhanced, thereby preventing platinum from the oxidation, as evidenced by the XPS result that the platinum on TiO2–SiO2–WO3, TiO2–SiO2 and TiO2 exists in metallic state, partially oxidized state and platinum oxide, respectively. These results suggest that the excellent propane combustion activity and good durability of the Pt/TiO2–SiO2–WO3 catalyst are attributed to the superior oxidation-resistance of platinum which is due to that the support has higher acidities at fairly strong acid strengths of −5.6 ≤ H0 ≤ −3.0 containing Brønsted acidities rather than very strong acid strengths of H0 ≤ −5.6.

Keywords
Acidity; TiO2; TiO2–SiO2; TiO2–SiO2–WO3; Platinum catalyst; Propane combustion; Support effect; Oxidation-resistance
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The support effect in oxidizing atmosphere on propane combustion over platinum supported on TiO2, TiO2–SiO2 and TiO2–SiO2–WO3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 1–2, 8 February 2007, Pages 94–100
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