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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 20, Number 12
BKCSDE 20(12)
December 20, 1999

Title	Chemical Poisoning of Ni/MgO Catalyst by Alkali Carbonate Vapor in the Steam Reforming Reaction of DIR-MCFC
Author	Hyeung-Dae Moon, Tae-Hoon Lim, Ho-In Lee
Keywords
Abstract	Chemical poisoning of Ni/MgO catalyst was induced by hot alkali carbonate vapor in molten carbonate fuel cell (MCFC), and the poisoned (or contaminated) catalyst was characterized by TPR/TPO, FTIR, and XRD analysis. Carbonate electrolytes such as K and Li were transferred to the catalyst during DIR-MCFC operation at 650 ℃. The deposition of alkali species on the catalyst consequently led to physical blocking on catalytic active sites and structural deformation by chemical poisoning. TPR/TPO analysis indicated that K species enhanced the reducibility of NiO thin film over Ni as co-catalyst, and Li species lessened the reducibility of metallic Ni by chemical reaction with MgO. FTIR analysis of the poisoned catalyst did not exhibit the characteristic υ1(D3h) peaks (1055 cm -1 , 1085 cm -1 ) for pure crystalline carbonates, instead a new peak (1120 cm -1 ) was observed proportionally with deformed alkali carbonates. From XRD analysis, the oxidation of metallic Ni into NixMg1-xO was confirmed by the peak shift of MgO with shrinking of Ni particles. Conclusively, hot alkali species induced both chemical poisoning and physical deposition on Ni/MgO catalyst in DIR-MCFC at 650℃.
Page	1413 - 1417
Full Text	PDF

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