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Fischer-Tropsch synthesis on the cobalt impregnated catalyst using carbon-coated Ni/SiO2
배종욱,Hyun-Mo Koo,한귀영 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.5
Carbon-coated Ni/SiO2 prepared by dry reforming of CH4 with CO2 was applied for the preparation of the cobalt-based Fischer-Tropsch synthesis (FTS) catalyst with 20 wt%Co to elucidate the metal-support interaction to FTS activity after carbon depositions on the Ni/SiO2. The deposited carbons on the reforming catalyst of Ni/SiO2, which were mainly in the form of filamentous or encapsulated carbons, largely increased CO conversion compared with the fresh Ni/SiO2 without a significant variation of hydrocarbon distributions. The deposited carbons on the Ni/SiO2 play an important role in increasing the reducibility of cobalt oxides due to a mitigated metal-support interaction. The enhanced catalytic activity during FTS reaction is mainly attributed to the proper modification of the Ni/SiO2 surfaces with encapsulated carbons on the exposed nickel surfaces, which largely alters the reducibility of cobalt oxides by reducing the interaction of cobalt particles with the carbon-coated Ni/SiO2 surfaces.
1LG-4 Syngas transformations to clean fuels using mesoporous materials
배종욱,구현모,조재민,함형원 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The syntheses of valued-added chemicals from syngas were investigated using the ordered mesoporous metal oxides such as the cobalt or iron-based catalysts for CO hydrogenation to form paraffinic hydrocarbons (Fischer-Tropsch synthesis, FTS) and Cu supported on the M-modified mesoporous alumina (M = Zn, Ga) for DME synthesis form syngas. A higher catalytic activity and its stability on the mesoporous metal oxides were obtained by modifying them with optimal contents of structural promoters. For the FTS reaction, the mesoporous CoAlOx and FeZrOx catalysts showed a stable catalytic activity with higher C5+ hydrocarbon formation rate due to the preserved mesoporous structures. For the direct DME synthesis from syngas, the ordered mesoporous Cu/Ga-Al2O3 showed a slower deactivation phenomenon due to the phase transformations of the Ga2O3 modifier in the matrix of Al2O3 without any significant aggregations of copper nanoparticles.
Effects of In and Ga-incorporation in FER frameworks for a gas-phase DME carbonylation reaction
배종욱,정동재 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Zeolites are promising materials in the industrial fields as commercial solid-acid catalysts due to their characteristic acidic properties and regular microporous structures. Generally, MOR zeolite has been known to be active for a gas-phase DME carbonylation, however, severe coke depositions on the MOR caused a fast deactivation. In terms of catalyst recycle and stability, FER zeolite has some advantages compared to the MOR due to their planner structures with less coke depositions. In the present study, the effects of metal substitutions such as In and Ga in the zeolite frameworks were investigated to control the strength and distribution of acidic sites. The zeolite synthesis was carried out with structure directing agent (SDA) and metal sources such as In and Ga precursor simultaneously. The catalyst stability and activity on the metal-incorporated FER were in-situ measured and characterized by using various surface characterization tools.