Production of hydrogen from dimethyl ether over supported rhodium catalysts

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Abstract

Infrared (IR) spectroscopy revealed that dimethyl ether (DME) undergoes partial dissociation on pure and rhodium-containing CeO2 at 300 K to yield methoxy and methyl species. This process is promoted by the presence of rhodium. By means of thermal desorption measurements (TPD), the adsorption of DME on Rh/CeO2 at 300 K and subsequent decomposition of DME (T p≈370 K), releasing H2, CO, CO2, and CH 4, with Tp between 420 and 673 K, were ascertained. Rh/CeO2 is an effective catalyst for the decomposition of DME to give H2 (29-35 %), CO (27-30%) and CH4 (32-38%) as major products with complete conversion at 673-723 K. Adding water to DME changed the product distribution and increased the selectivity of H2 formation from 30-35% to 58% at 723 K. In situ IR spectroscopy showed absorption bands of CO at 2034 and 1893 cm-1 during the reaction at 673-773 K. Deactivation of the catalyst did not occur at 773 K during the time measured (approximately 10 h). Rh deposited on carbon Norit also exhibited a high activity towards the decomposition of DME, but the selectivity towards hydrogen was lower.

Original languageEnglish
Pages (from-to)311-317
Number of pages7
JournalChemCatChem
Volume1
Issue number2
DOIs
Publication statusPublished - Oct 5 2009

Keywords

  • Cerium
  • Heterogeneous catalysis
  • Hydrogen
  • IR spectroscopy
  • Rhodium

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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