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Supported Rh catalysts for methane partial oxidation prepared by OM-CVD of Rh(acac)(CO)2

Paper ID Volume ID Publish Year Pages File Format Full-Text
42994 45950 2008 8 PDF Available
Title
Supported Rh catalysts for methane partial oxidation prepared by OM-CVD of Rh(acac)(CO)2
Abstract

The organometallics chemical vapour deposition (OM-CVD) technique, using Rh(acac)(CO)2 as a precursor, was employed for the preparation of heterogeneous Rh catalysts supported on low surface area refractory oxides (α-Al2O3, ZrO2, MgO and La2O3). Prepared systems were tested in the methane catalytic partial oxidation (CH4-CPO) reaction in a fixed bed reactor and compared to a reference catalyst prepared from impregnation of Rh4(CO)12.Catalysts supported on Al2O3, ZrO2 and MgO show better or comparable performances with respect to the reference system.Complete decomposition of Rh precursor during formation of the metal phase under reductive conditions was investigated by TPRD and confirmed by infrared and mass spectrometry data.Supported Rh phase was characterized by CO and H2 chemisorption, CO-DRIFT spectroscopy and HRTEM microscopy in fresh and aged selected samples. Rh(I) isolated sites and Rh(0) metal particles were found on fresh catalysts; after ageing an extensive reconstruction occurs mainly consisting in a sintering of Rh isolate sites to metal particles but without large increase in mean particles size.Catalytic performances and Rh species balance were found to be dependent on the support material.

Graphical abstractSupported Rh catalysts, prepared by OM-CVD of Rh(acac)(CO)2, showed good performances in hydrogen/syngas production by the methane catalytic partial oxidation reaction. During ageing an extensive reconstruction occurs consisting in a sintering of Rh isolate sites to metal particles but without large increase in mean particles size. Catalytic performances were found to be dependent on the support material. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
OM-CVD; Rh catalysts; CH4 CPO; Rh(acac)(CO)2; Syngas; Hydrogen production
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Supported Rh catalysts for methane partial oxidation prepared by OM-CVD of Rh(acac)(CO)2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 126–133
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