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Title: The influence of nano-architectured CeOx supports in RhPd/CeO₂ for the catalytic ethanol steam reforming reaction

Abstract

The ethanol steam reforming (ESR) reaction has been tested over RhPd supported on polycrystalline ceria in comparison to structured supports composed of nanoshaped CeO₂ cubes and CeO₂ rods tailored towards the production of hydrogen. At 650-700 K the hydrogen yield follows the trend RhPd/CeO₂-cubes > RhPd/CeO₂ -rods > RhPd/CeO₂- polycrystalline, whereas at temperatures higher than 800 K the catalytic performance of all samples is similar and close to the thermodynamic equilibrium. The improved performance of RhPd/CeO₂-cubes and RhPd/CeO₂ -rods for ESR at low temperature is mainly ascribed to higher water-gas shift activity and a strong interaction between the bimetallic - oxide support interaction. STEM analysis shows the existence of RhPd alloyed nanoparticles in all samples, with no apparent relationship between ESR performance and RhPd particle size. X-ray diffraction under operating conditions shows metal reorganization on {100} and {110} ceria crystallographic planes during catalyst activation and ESR, but not on {111} ceria crystallographic planes. The RhPd reconstructing and tuned activation over ceria nanocubes and nanorods is considered the main reason for better catalytic activity with respect to conventional catalysts based on polycrystalline ceria

Authors:
 [1];  [2];  [1];  [2];  [3];  [1]
  1. Univ. Politècnica de Catalunya, Barcelona (Spain)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. di Udine, Udine (Italy)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1188250
Alternate Identifier(s):
OSTI ID: 1251821
Report Number(s):
BNL-108064-2015-JA
Journal ID: ISSN 0920-5861; R&D Project: Co009; KC0302010
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Catalysis Today
Additional Journal Information:
Journal Volume: 253; Journal Issue: C; Journal ID: ISSN 0920-5861
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Divins, N. J., Senanayake, S. D., Casanovas, A., Xu, W., Trovarelli, A., and Llorca, J. The influence of nano-architectured CeOx supports in RhPd/CeO₂ for the catalytic ethanol steam reforming reaction. United States: N. p., 2015. Web. doi:10.1016/j.cattod.2014.12.042.
Divins, N. J., Senanayake, S. D., Casanovas, A., Xu, W., Trovarelli, A., & Llorca, J. The influence of nano-architectured CeOx supports in RhPd/CeO₂ for the catalytic ethanol steam reforming reaction. United States. doi:10.1016/j.cattod.2014.12.042.
Divins, N. J., Senanayake, S. D., Casanovas, A., Xu, W., Trovarelli, A., and Llorca, J. Mon . "The influence of nano-architectured CeOx supports in RhPd/CeO₂ for the catalytic ethanol steam reforming reaction". United States. doi:10.1016/j.cattod.2014.12.042. https://www.osti.gov/servlets/purl/1188250.
@article{osti_1188250,
title = {The influence of nano-architectured CeOx supports in RhPd/CeO₂ for the catalytic ethanol steam reforming reaction},
author = {Divins, N. J. and Senanayake, S. D. and Casanovas, A. and Xu, W. and Trovarelli, A. and Llorca, J.},
abstractNote = {The ethanol steam reforming (ESR) reaction has been tested over RhPd supported on polycrystalline ceria in comparison to structured supports composed of nanoshaped CeO₂ cubes and CeO₂ rods tailored towards the production of hydrogen. At 650-700 K the hydrogen yield follows the trend RhPd/CeO₂-cubes > RhPd/CeO₂ -rods > RhPd/CeO₂- polycrystalline, whereas at temperatures higher than 800 K the catalytic performance of all samples is similar and close to the thermodynamic equilibrium. The improved performance of RhPd/CeO₂-cubes and RhPd/CeO₂ -rods for ESR at low temperature is mainly ascribed to higher water-gas shift activity and a strong interaction between the bimetallic - oxide support interaction. STEM analysis shows the existence of RhPd alloyed nanoparticles in all samples, with no apparent relationship between ESR performance and RhPd particle size. X-ray diffraction under operating conditions shows metal reorganization on {100} and {110} ceria crystallographic planes during catalyst activation and ESR, but not on {111} ceria crystallographic planes. The RhPd reconstructing and tuned activation over ceria nanocubes and nanorods is considered the main reason for better catalytic activity with respect to conventional catalysts based on polycrystalline ceria},
doi = {10.1016/j.cattod.2014.12.042},
journal = {Catalysis Today},
number = C,
volume = 253,
place = {United States},
year = {2015},
month = {1}
}

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