Conversion of biomass tar containing sulphur to syngas by GdCeO2 coated NiFe bimetallic-based catalysts
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Author list: Laosiripojana N., Sutthisripok W., Charojrochkul S., Assabumrungrat S.
Publisher: Elsevier
Publication year: 2014
Journal: Applied Catalysis A: General (0926-860X)
Volume number: 478
Start page: 9
End page: 14
Number of pages: 6
ISSN: 0926-860X
eISSN: 1873-3875
Languages: English-Great Britain (EN-GB)
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Abstract
Catalytic activities of pellet-shape NiFe/MgOAl2O3 with and without GdCeO2 (CGO) coating toward steam reforming of naphthalene (as tar model compound) and biomass tar from pyrolysis of eucalyptus in the presence of H2S was studied under various conditions including different temperatures (between 700 and 900 ฐC), inlet H 2S (from 100 to 1000 ppm) and inlet H2O concentrations. It was found that under sufficient conditions CGO coating can efficiently promote sulfur tolerant and resistance toward carbon deposition of NiFe/MgOAl 2O3, from which less deactivation occurs after prolong testing (18 h) compared to the catalyst without CGO coating. In addition, the catalyst activity can be completely regenerated by purging air at 800 ฐC, from which almost the same level of H2 yield can be enhanced after regeneration. It was revealed from the study that in the presence of sufficient H2O concentration, the phase of CeO2 potentially transforms to Ce(SO4)2, which helps NiFe/MgOAl 2O3 promote high tar reforming activity. In contrast, with less H2O presenting, Ce2O2S is formed and consequently results in low sulfur tolerant activity. Nevertheless, by purging Ce2O2S with air, the phases of CeO2 and Ce(SO4)2 can be effectively recovered. This study therefore highlights the great benefit of CGO coating over NiFe/MgOAl2O 3 for tar reforming in terms of sulphur tolerant promotion and achievable catalyst regeneration. ฉ 2014 Elsevier B.V.
Keywords
Catalyst deactivation, Keywords, Tar conversion
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