Conversion of poisonous methanethiol to hydrogen-rich gas by chemisorption/reforming over nano-scale CeO2: The use of CeO2 as catalyst coating material
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Author list: Laosiripojana N., Assabumrungrat S.
Publisher: Elsevier
Publication year: 2011
Journal: Applied Catalysis B: Environment and Energy (0926-3373)
Volume number: 102
Issue number: #
Start page: 267
End page: 275
Number of pages: 9
ISSN: 0926-3373
eISSN: 1873-3883
Languages: English-Great Britain (EN-GB)
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Abstract
Synthesized nano-scale CeO2 enables to convert poisonous methanethiol (CH3SH) to hydrogen-rich gas via the solid-gas reaction between CeO2 and CH3SH under sufficient condition. In the presence of H2O, the phase of Ce(SO4)2 occurs from the reaction and offers high CH3SH reforming activity. In contrast, without H2O adding, Ce2O2S is formed instead and results in low catalyst activity. Further catalyst improvement was performed by coating this synthesized nano-scale CeO2 over cylindrical-shape Rh/Al2O3 pellet (as called CeO2-coated Rh/Al2O3). This developed catalyst was found to enhance good activity, stability, and reusability (over 5 reaction cycles; 72h) for converting CH3SH to hydrogen-rich gas with high hydrogen yield achievement. For more practical application, this catalyst was also tested over olefin offgas containing CH3SH and ethanethiol (CH3SCH3) from an olefin manufacturing; and was found to efficiently convert this offgas to hydrogen-rich gas without sulfur present in the product gas under a proper regeneration time. This result highlights a great benefit of CeO2-coated Rh/Al2O3 for integrating the clean energy generation with toxic-waste treatment, which offers significant energy and environmental benefits. ฉ 2010 Elsevier B.V.
Keywords
Methanethiol
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