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Pd–In2O3 interaction due to reduction in hydrogen: Consequences for methanol steam reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
42151 45912 2010 9 PDF Available
Title
Pd–In2O3 interaction due to reduction in hydrogen: Consequences for methanol steam reforming
Abstract

Two different Pd/In2O3 samples including a thin film model catalyst with well-defined Pd particles grown on NaCl(0 0 1) supports and a powder catalyst prepared by an impregnation technique are examined by electron microscopy, X-ray diffraction and catalytic measurements in methanol steam reforming in order to correlate the formation of different oxide-supported bimetallic Pd–In phases with catalytic activity and selectivity.A PdIn shell around the Pd particles is observed on the thin film catalyst after embedding the Pd particles in In2O3 at 300 K, likely because alloying to PdIn and oxidation to In2O3 are competing processes. Increased PdIn bimetallic formation is observed up to 573 K reduction temperature until at 623 K the film stability limit in hydrogen is reached. Oxidative treatments at 573 K lead to decomposition of PdIn and to the formation of an In2O3 shell covering the Pd particles, which irreversibly changes the activity and selectivity pattern to clean In2O3.PdIn and Pd2In3 phases are obtained on the powder catalyst after reduction at 573 K and 673 K, respectively. Only CO2-selective methanol steam reforming is observed in the reduction temperature range between 473 K and 573 K. After reduction at 673 K encapsulation of the bimetallic particles by crystalline In2O3 suppresses CO2 formation and only activity and selectivity of clean In2O3 are measured.

Graphical abstractDespite the striking similarities of Pd supported on ZnO, Ga2O3 and In2O3 regarding bimetallic formation and catalytic selectivity in methanol steam reforming, In2O3 shows pronounced additional strong metal–support interaction effects at very low temperatures seriously affecting the catalytic properties of Pd/In2O3 catalysts.Figure optionsDownload full-size imageDownload high-quality image (100 K)Download as PowerPoint slide

Keywords
Electron microscopy; Pd–In intermetallics; PdIn; Pd2In3; Methanol steam reforming
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Pd–In2O3 interaction due to reduction in hydrogen: Consequences for methanol steam reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 180–188
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