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Ni catalyst wash-coated on metal monolith with enhanced heat-transfer capability for steam reforming

Authors
Ryu, Jae-HongLee, Kwan-YoungLa, HowonKim, Hak-JooYang, Jung-IlJung, Heon
Issue Date
27-Sep-2007
Publisher
ELSEVIER SCIENCE BV
Keywords
nickel catalyst; metal monolith; steam reforming; noble metal doping; heat-transfer enhancement; hydrogen fuel cells
Citation
JOURNAL OF POWER SOURCES, v.171, no.2, pp.499 - 505
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
171
Number
2
Start Page
499
End Page
505
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125704
DOI
10.1016/j.jpowsour.2007.05.107
ISSN
0378-7753
Abstract
A commercial Ni-based catalyst is wash-coated on a monolith made of 50 mu m-thick fecralloy plates. Compared with the same volume of coarsely powdered Ni catalysts, the monolith wash-coated Ni catalysts give higher methane conversion in the steam reforming reaction, especially at gas hourly space velocities (GHSV) higher than 28,000 h(-1), and with no pressure drop. A higher conversion of the monolith catalyst is obtained, even though it contains a lower amount of active catalyst (3 g versus 17 g for a powdered catalyst), which indicates that the heat-transfer capability of the wash-coated Ni catalyst is significantly enhanced by the use of a metal monolith. The efficacy of the monolith catalyst is tested using a shell-and-tube type heat-exchanger reactor with 912 cm(3) of the monolith catalyst charged on to the tube side and hot combusted gas supplied to the shell side in a counter-current direction to the reactant flow. A methane conversion greater than 94% is obtained at a GHSV of 7300 h(-1) and an average temperature of 640 degrees C. Nickel catalysts should first be reduced to become active for steam reforming. Doping a small amount (0.12 wt.%) of noble metal (Ru or Pt) in the commercial Ni catalyst renders the wash-coated catalyst as active as a pre-reduced Ni catalyst. Thus, noble metal-doped Ni appears useful for steam reforming without any pre-reduction procedure. (C) 2007 Elsevier B.V. All rights reserved.
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