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In Kyu Song

Bio: In Kyu Song is an academic researcher from Seoul National University. The author has contributed to research in topics: Catalysis & Catalyst support. The author has an hindex of 43, co-authored 342 publications receiving 7078 citations. Previous affiliations of In Kyu Song include Myongji University & University of Delaware.


Papers
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TL;DR: In this article, the effect of resorcinol to catalyst ratio (R / C ratio) on volume shrinkage, BET surface area, and electrochemical property of carbon aerogels was investigated by cyclic voltammetry measurement.

121 citations

Journal ArticleDOI
TL;DR: In this article, the effect of nickel content on the catalytic performance of XNiAl catalysts was investigated, and the authors concluded that the optimal nickel content of a nickel-alumina xerogel catalyst for methanation reaction was 40 wt% when considering the amount of nickel used for the preparation of catalyst.

101 citations

Journal ArticleDOI
TL;DR: In this paper, a mesoporous carbon nanopipes with various nitrogen states are prepared by controlling the carbonization temperature. But, the optimum carbonisation temperature is 1123 K, while collapse of the carbon structure is observed above 1173 K.

95 citations

Journal ArticleDOI
TL;DR: In this article, a single-step sol-gel method for carbon dioxide and hydrogen methanation was used to determine the catalytic performance of mesoporous nickel-alumina xerogel catalysts.
Abstract: Mesoporous nickel (35 wt%)–M (5 wt%)–alumina xerogel (denoted as 35Ni5MAX) catalysts with different second metal (M = Fe, Zr, Ni, Y, and Mg) were prepared by a single-step sol–gel method for use in the methane production from carbon dioxide and hydrogen. In the carbon dioxide methanation reaction, yield for CH4 decreased in the order of 35Ni5FeAX > 35Ni5ZrAX > 35Ni5NiAX > 35Ni5YAX > 35Ni5MgAX. This indicated that the catalytic performance was greatly influenced by the identity of second metal in the carbon dioxide methanation reaction. Experimental results revealed that CO dissociation energy and metal-support interaction of the catalyst played key roles in determining the catalytic performance of 35Ni5MAX catalysts in the reaction. Among the catalysts tested, 35Ni5FeAX catalyst, which retained the most optimal CO dissociation energy and the weakest metal-support interaction, exhibited the best catalytic performance in terms of conversion of CO2 and yield for CH4. In the carbon dioxide methanation over mesoporous nickel–M–alumina xerogel catalysts with different second metal (M = Fe, Zr, Ni, Y, and Mg), yield for CH4 increased with decreasing TPSR peak temperature and with decreasing metal-support interaction of the catalyst.

95 citations

Journal ArticleDOI
TL;DR: In this article, the role and effect of Mo on the catalytic performance of Ni-Mo/γ-Al2O3 catalysts in the auto-thermal reforming of ethanol was examined.
Abstract: Bimetallic Ni-Mo/γ-Al2O3 catalysts (Ni20MoX, Ni = 20 wt.%, X = 0, 3, 5, 7, and 9 wt.%) with different Mo contents were prepared using a co-impregnation method. The role and effect of Mo on the catalytic performance of the Ni-Mo/γ-Al2O3 catalysts in the auto-thermal reforming of ethanol was examined. It was found that the addition of Mo up to 7 wt.% decreased the interaction between the Ni species and the alumina support, increasing the reducibility of Ni species. On the other hand, the Ni20Mo9 catalyst was less effective in hydrogen production than the Ni20Mo7 catalyst due to the formation of bulky NiMoO4 in the Ni20Mo9 catalyst. It was also revealed that Mo species served as a barrier for preventing the growth of Ni particles, leading to the formation of highly dispersed Ni-Mo/γ-Al2O3 catalysts. In the auto-thermal reforming of ethanol, bimetallic Ni20MoX catalysts (X = 3, 5, and 7 wt.%) catalysts exhibited a higher catalytic performance than the monometallic Ni20 catalyst. Among the catalysts tested, the Ni20Mo5 catalyst showed the best catalytic performance. However, addition of excess Mo (9 wt.%) decreased the catalytic performance of the bimetallic supported catalyst, resulting from both poor reducibility of Ni species and coverage of Ni sites by MoOX species. It was also observed that the Ni20 catalyst experienced a severe catalyst deactivation due to coke deposition on the catalyst surface during the catalytic reaction.

86 citations


Cited by
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Journal ArticleDOI
TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.

3,168 citations

01 Nov 2000
TL;DR: In this paper, the authors compared the power density characteristics of ultracapacitors and batteries with respect to the same charge/discharge efficiency, and showed that the battery can achieve energy densities of 10 Wh/kg or higher with a power density of 1.2 kW/kg.
Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

2,437 citations

Journal ArticleDOI
TL;DR: This critical review provides a survey illustrated by recent references of different strategies to achieve a sustainable conversion of biomass to bioproducts to examine critically the green character of conversion processes.
Abstract: This critical review provides a survey illustrated by recent references of different strategies to achieve a sustainable conversion of biomass to bioproducts. Because of the huge number of chemical products that can be potentially manufactured, a selection of starting materials and targeted chemicals has been done. Also, thermochemical conversion processes such as biomass pyrolysis or gasification as well as the synthesis of biofuels were not considered. The synthesis of chemicals by conversion of platform molecules obtained by depolymerisation and fermentation of biopolymers is presently the most widely envisioned approach. Successful catalytic conversion of these building blocks into intermediates, specialties and fine chemicals will be examined. However, the platform molecule value chain is in competition with well-optimised, cost-effective synthesis routes from fossil resources to produce chemicals that have already a market. The literature covering alternative value chains whereby biopolymers are converted in one or few steps to functional materials will be analysed. This approach which does not require the use of isolated, pure chemicals is well adapted to produce high tonnage products, such as paper additives, paints, resins, foams, surfactants, lubricants, and plasticisers. Another objective of the review was to examine critically the green character of conversion processes because using renewables as raw materials does not exempt from abiding by green chemistry principles (368 references).

2,077 citations

Journal ArticleDOI
TL;DR: In this paper, the potential of lignocellulosic biomass as an alternative platform to fossil resources has been analyzed and a critical review provides insights into the potential for LBS.

1,763 citations