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Surface analysis of Pd/ZnO catalysts dispersed on micro-channeled Al-foils by XPS

Paper ID Volume ID Publish Year Pages File Format Full-Text
43486 45972 2008 5 PDF Available
Title
Surface analysis of Pd/ZnO catalysts dispersed on micro-channeled Al-foils by XPS
Abstract

We have investigated the surface composition of Pd/ZnO catalysts dispersed on micro-channeled Al-foils in a non-activated and in the activated state, between 300 and 700 K using X-ray photoelectron spectroscopy (XPS). While the surface of the non-activated catalyst, as obtained after calcination, is composed of PdO, the surface of the activated (reduced) catalyst consists of predominantly PdZn and ∼30% metallic Pd. When increasing the temperature up to 700 K in UHV significant structural surface changes were observed for both samples. For the non-activated sample, PdO was reduced mainly to the Pd metal with some fraction of PdZn alloy. For the activated catalyst, the fraction of metallic Pd was also converted to PdZn, yielding a pure alloy, which is stable to at least 600 K. At 700 K both samples show changes due to segregation of Mg from the micro-channeled Al-foils onto which the powdered catalysts were deposited, which contains 3% Mg.

Graphical abstractX-ray photoelectron spectroscopy (XPS) investigation of non-activated and activated Pd/ZnO catalysts dispersed on micro-channeled Al-foil reveals that the former is composed of PdO, while the latter comprises mainly PdZn and ∼30% metallic Pd in the surface region. The fraction of Pd metal was completely converted to PdZn in the activated catalyst following heating to 600 K in UHV. PdO species in the non-activated sample were reduced to the metal in the same temperature range. Mg segregation occurred above 700 K in both samples. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pd/ZnO catalyst; PdZn; Methanol steam reforming; X-ray photoelectron spectroscopy; Mg enrichment
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Surface analysis of Pd/ZnO catalysts dispersed on micro-channeled Al-foils by XPS
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 348, Issue 2, 15 October 2008, Pages 209–213
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