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Tunability of propane conversion over alumina supported Pt and Rh catalysts

Chueh, William C. and Shao, Zongping and Haile, Sossina M. (2007) Tunability of propane conversion over alumina supported Pt and Rh catalysts. Topics in Catalysis, 46 (3-4). pp. 402-413. ISSN 1022-5528.

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Propane conversion over alumina supported Pt and Rh (1 wt% metals loading) was examined under fuel rich conditions (C_3H_8:O_2:He = 1:2.25:9) over the temperature range 450–650 °C. Morphological characteristics of the catalyst materials were varied by calcining at selected temperatures between 500 and 1,200 °C. X-ray diffraction and BET analysis showed the treatment generated catalyts metals with particle sizes in the range of <10 to >500 nm, and support surface areas in the range of 20–240 m^2/g. Remarkably, both Rh and Pt yielded product compositions close to equilibrium values (with high H_2 and CO selectivity, complete oxygen conversion and almost complete propane conversion) so long as the metal particle size was sufficiently low, ≲10–15 nm. In cases where the particle size was large, primarily complete oxidation rather than partial oxidation products were observed, along with unreacted C_3H_8, indicative of a direct oxidation pathway in which gas-phase CO and H_2 are not present as intermediate species. It is proposed that the high resistance of Rh to coarsening is largely responsible for the observation of a higher selectivity of this material for syngas products when prepared by procedures similar to those for Pt. Overall, the tunability of the product composition obtained over Rh and Pt via processing steps has direct significance for the incorporation of such catalyts into the anodes of solid oxide fuel cells.

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Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2007 Springer. Published online: 27 November 2007. The authors gratefully acknowledge the assistance of Carol Garland (Caltech) in obtaining the TEM images and Dr. David G. Goodwin (Caltech) for insightful discussions. This study was funded by DARPA, Microsystems Technology Office and by ONR, Office of Electrochemical Power Science and Technology. Additional support was provided by the National Science Foundation (DMR-0080065) via Caltech’s Center for the Science and Engineering of Materials, an NSF Materials Research Science and Engineering Center (MRSEC).
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:Pt/Al2O3 Rh/Al2O3 Propane partial oxidation Mental particle coarsening SOFC anode catalyst
Issue or Number:3-4
Record Number:CaltechAUTHORS:20131114-152819115
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42476
Deposited By: Jonathan Gross
Deposited On:15 Nov 2013 00:34
Last Modified:03 Oct 2019 05:58

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