Choi, JS Yun, JS Kwon, HH Lim, TH Hong, SA Lee, HI 2024-01-21T04:34:24Z 2024-01-21T04:34:24Z 2021-09-03 2005-08-18 0378-7753 https://pubs.kist.re.kr/handle/201004/136212 Despite many advantages of the direct internal reforming molten carbonate fuel cell (DIR-MCFC) in producing electricity, there are many problems to solve before practical use. The deactivation of reforming catalyst by alkali like lithium is one of the major obstacles to overcome. A promising method is addition of TiO2 into the Ni/MgO reforming catalyst, which resulted in the increased resistance to lithium poisoning as we previously reported. To understand how added titania worked, it is necessary to elucidate the deactivation mechanism of the catalysts supported on metal oxides such as MgO and MgO-TiO2 composite oxide. Several supported nickel catalysts deactivated by lithium carbonate were prepared, characterized and evaluated. The Ni/MgO catalyst turned out to be most vulnerable to lithium deactivation among the employed catalysts. The activity of the Ni/MgO gradually decreased to zero with increasing amount of lithium addition. Deactivation by lithium addition resulted from the decrease of active site due to sintering of nickel particles as well as the formation of the LiyNixMg1-x-yO ternary solid solution. These were evidenced by H-2 chemisorption, temperature programmed reduction, and XRD analyses. As an effort to minimize Li-poisoning, titanium was introduced to MgO support. This resulted in the formation of Ni/Mg2TiO4, which seemed to increase resistance against Li-poisoning. (c) 2005 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV DOPED NI/MGO CATALYSTS MECHANISM METHANE SYSTEM VAPOR PHASE OXIDE SIZE Effect of lithium carbonate on nickel catalysts for direct internal reforming MCFC Article 10.1016/j.jpowsour.2004.12.066 1 JOURNAL OF POWER SOURCES, v.145, no.2, pp.652 - 658 JOURNAL OF POWER SOURCES 145 2 652 658 scie scopus 000231893300070 2-s2.0-23844506189 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article; Proceedings Paper DOPED NI/MGO CATALYSTS MECHANISM METHANE SYSTEM VAPOR PHASE OXIDE SIZE deactivation by lithium Ni/MgO Ni/MgO-TiO2 DIR-MCFC