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타이타니아계 촉매상에서의 CO 에 의한 SO2 환원 반응
우희철,이진우,이병선,하기성,박대원,정종식 ( Hee Chul Woo,Jin Woo Lee,Byung Sun Lee,Ki Sung Ha,Dae Won Park,Jong Shik Chuhg ) 한국공업화학회 1997 응용화학 Vol.1 No.1
A series of MO_x(transition metal oxides)/TiO₂ powder mixture were studied as catalysts for the reduction of SO₂ by CO to elemental sulfur. Among these catalysts, SnO₂/TiO₂ was found to be the most effective catalyst for the reaction. When the catalyst was a mixture of SnO₂ and TiO₂ the activity increased drastically. Experimental evidence of the formation of a stable COS was obtained from a two-stage reactor system and TPR. XRD data of the used catalyst showed the presence of SnS₂, SnS and TiO_(2-x) phases. In the reaction system, an equilibrium is established between SnS₂ and SnS, which acts as a medium for sulfur supply in the formation of COS. From the above results, a mechanism based on formation of COS intermediate and catalyst bifunctionality is proposed for the SO₂ reduction by CO.
우희철(Hee Chul Woo),이창열(Chang-Lyoul Lee),최진우(Jin Woo Choi) 한국진공학회 2019 진공 이야기 Vol.6 No.1
Perovskite materials have attracted a huge amount of scientific attention as promising semiconducting material for optoelectronic devices due to their outstanding optical-electrical properties and solution processability. In this article, characteristics of multidimensional perovskites enabling high photoluminescence quantum yield and narrow full width half maximum are introduced. Finally, various application of these materials are discussed.
홍성수,우희철,이근대 ( Seong Soo Hong,Hee Chul Woo,Gun Dae Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.5
여러 가지의 고체산 촉매에 의한 1-펜텐의 골격이성화 반응에서 반응활성, 선택도, 반응메카니즘 및 촉매의 산의 세기와 촉매활성과의 관계를 연구하였다. 여러 가지의 고체산 촉매중에서 천연제올라이트가 가장 높은 활성을 보여주었고, 불소나 황산으로 처리된 η-알루미나는 변형되지 않은 경우에 비해 활성이 크게 증가하였다. 한편 반응온도가 증가할 수록 이소펜텐의 수율이 증가하였고, 접촉시간의 증가에 따라 이소펜텐의 수율이 증가하였다. 그러나 높은 반응온도와 아주 긴 접촉시간에서는 크래킹 반응의 생성물이 증가하였다. 금속이온으로 치환된 천연제올라이트에서의 활성은 감소하였고, 이것은 금속이온의 polarizing power와 관계가 있는 것으로 나타났다. 암모니아 승온탈착실험 결과에 의하면 촉매의 활성은 촉매의 산의 세기와 밀접한 관계가 있는 것으로 나타났다. In the skeletal isomerization of 1-pentene over various solid acid catalysts, we have studied catalytic reactivity, selectivity, reaction mechanism and the relation between acid strength of catalysts and catalytic activity. Natural zeolite shows highest activity among the all catalysts and the modified η-alumina with fluorine and sulfuric acid shows higher activity than unmodified η-alumina. The yield of isopentene increases with increasing temperature and increasing contact time. However the cracking products increase at the high temperature and very high contact time. In addition, the activity of natural zeolite exchanged with metal cation decreases and shows good relation with the polarizing power of metal cation. According to the result of ammonia TPD, the acid strength of catalysts has an effect on catalytic activity.
실리카 담지 12-몰리브도인산 촉매상에서의 아산화질소에 의한 메탄의 부분산화반응
홍성수,우희철,주창식,이근대,( Seong Soo Hong,Hee Chul Woo,Chang Sik Ju,Gun Dae Lee,J . B . Moffat ) 한국공업화학회 1994 공업화학 Vol.5 No.1
실리카에 담지된 혜테로폴리산 촉매에서 아산화질소에 의한 메탄의 부분산화반응을 연구하였다. 여러 가지의 반응조건, 즉 반응온도, 반응물의 분압, 접촉시간, 촉매의 담지량 및 전처리온도 등이 전환율이나 생성물의 선택도 및 속도론에 미치는 영향이 연구되었다. 20wt%로 담지된 촉매가 전환율과 포름알데히드의 수율에 있어서 가장 높은 값을 보여 주었다. 메탄의 전환반응에서의 속도식을 구한 결과, 메탄에 대해서는 1차식을 보여 주었고, 아산화질소에 대한 반응차수는 약 0.4였다. 또한 전체반응의 겉보기 활성화에너지는 30.78 ㎉/mole 이었다. 반응물 중에 첨가된 소량의 사염화탄소는 메탄의 산화반응에서 실리카 담지 HPMo촉매의 활성을 증가시키는 반면에, 반응물에 첨가된 물은 오히려 활성을 감소시키는 것을 볼 수 있었다. The partial oxidation of methane with nitrous oxide on silica-supported metal-oxygen cluster compounds, known as heteropoly acids, has been studied. The effects of several variables such as reaction temperature, partial pressure of reactants, residence time, loading of the catalysts, and pretreatment temperature, on the conversion and product distribution were observed. The kinetics also has been studied. The conversion and yield of formaldehyde show maximum values at a loading of 20 wt%. The apparent reaction order of methane conversion is ca. 1.0 with respect to CH_4 and ca. 0.4 with respect to N_2O. In addition, the apparent activation energy is 30.78 ㎉/mole. The addition of small quantities of tetrachloromethane to the reactant stream enhanced the activity of the silica-supported HPMo in the oxidation of methane, whereas water introduced to the reactant decreased the activity of catalyst under present study.
K / MoS2 촉매상에서 일산화탄소와 수소로부터의 혼합알코올제조에 관한 반응속도식의 모델링
박태윤,우희철,남인식,김영걸 ( Tae Yun Park,Hee Chul Woo,In Sik Nam,Young Gul Kim ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
A kinetic model on the synthesis of mixed alcohol from CO and H₂ over K/MoS₂ catalyst has been developed. The formation of linear mixed alcohol can be elucidated by CO insertion mechanism so that a rigorous kinetic network has been developed to derive the kinetic model that well describes the conversion and selectivity of products. Kinetic model derived in this study consists of 40 coupled nonlinear differential equations with the steady state approximation for reaction intermediates. The model well predicted the experimental observations within the experimental condition. The effect of reaction conditions on the catalytic activity was also examined. Optimal temperature of CO conversion for alcohols was ca. 320℃ and the higher the reactor pressure the more alcohols are produced.