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Active state of tungsten oxides on WO3/ZrO2 catalyst for steam reforming of dimethyl ether combined with CuO/CeO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
44215 46009 2006 5 PDF Available
Title
Active state of tungsten oxides on WO3/ZrO2 catalyst for steam reforming of dimethyl ether combined with CuO/CeO2
Abstract

Steam reforming of dimethyl ether (DME) was carried out over WO3/ZrO2–CuO/CeO2 catalysts. The effect of the method of preparation of WO3/ZrO2 on its activity was investigated. Three kinds of WO3/ZrO2 were prepared by impregnating ammonium paratungstate (APT), ammonium metatungstate (AMT), and tungsten hexachloride (WCl). Although these WO3/ZrO2 catalysts had different activities, no difference was observed in their acidic property. The TG-DTA analysis clarified that the different kinds of W precursors affected the crystallization process of zirconia differently. The interaction with zirconia during calcination gave specific properties to the surface W species that are different from those of the single component WO3. The XPS study on the surface W species showed that H2 production rate depended on the surface WO3 amount and on the W(V)/[W(VI) + W(V)] ratio. Excess WO3 loading brought about the decrease in H2 production due to the formation of inactive bulk WO3. The active surface tungsten species were originated from W(V) components interacting with ZrO2. The APT gave the highest W(V)/[W(VI) + W(V)] ratio and, thus, was the best W precursor among the three.

Keywords
WO3/ZrO2; Steam reforming; Dimethyl ether; Valence state of W; XPS; Hydrogen; TG-DTA
First Page Preview
Active state of tungsten oxides on WO3/ZrO2 catalyst for steam reforming of dimethyl ether combined with CuO/CeO2
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 309, Issue 2, 1 August 2006, Pages 187–191
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis