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Co-Bi-Fe-Mo 다성분 혼합산화물 촉매의 구조특성이 프로필렌의 산화반응에 미치는 영향
황태수(Tae Soo Hwang),박대원(Dae Won Park),최명재(Myoung Jae Choi),정종식(Jong Shik Chung) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.1
Morphological and structural properties of several kinds of multicomponent oxides containing Co, Bi, Fe and Mo were characterized by means of BET, SEM, EPMA, ESCA and XRD, and their results were correlated with the results of catalytic activity tests for the propylene oxidation. CM (coprecipitation of Co and Mo precursor) was composed of pure CoMoO₄ phase. BFM (coprecipitation of Bi, Fe, Mo) was composed of mixtures of a large hexagonal plate-like structure of MoO₃ and small particles of MoO₃ on which α-Bi₂MO₃O_(12)(BM) and Fe₂(MoO₄)₃(FM) phase are dispersed. CM/BFM series catalysts (CM was deposited on BFM particles by precipitation) showed dispersion of CM phase on BFM, whereas BFM/CM (BFM deposited on CM) did not show any dispersion of CM. CBFM catalysts (coprecipitation of Co, Bi, Fe and Mo) which had similar strucrtures as CM/BFM were found to have more finely dispersed particles of CM on which BM phase was present as a coated layer. The catalytic activity increased in the order of mechanical mixture<CM/BFM<BFM/CM<CBFM. The activity became maximum at the CM content of less than 10 wt% for the former three catalysts, whereas the activity of CBFM increased monotonically with the CM content. The activity is governed by intimate contacts among phases and dispersion of main active phases of O₂-oxidizing CM and hydrocarbon-oxidizing BM. The dispersion of the latter is more important because of its slower oxidation rate.
생물화공 , 에너지 / 환경 : 고정층 재순환 반응기에서 이산화탄소의 수소화
김준식(Jun Sik Kim),강용(Yong Kang),이상봉(Sang Bong Lee),최명재(Myoung Jae Choi),이규완(Kyu Wan Lee) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.5
A catalytic fixed-bed recycle reactor was proposed to increase the level of reaction conversion in conducting the hydrogenation of CO_2. The hydrogenation of CO_2 was carried out over Fe-K/Al_2O_3 catalyst. The conversion of carbon dioxide(X_CO_2) increased with increasing reaction temperature and modified residence time(T_mod) in the fixed bed single reactor. In series reactors, the X_CO_2 increased up to the level of 68.5%(T=300℃, P=1.0MPa, H_2/CO_2=3 and SV=1,000㎖/g_cat.hr) in comparison with the level of 40.8% in the fixed bed single reactor at the same conditions. The X_CO_2 increased with increasing recycle ratio(R) and exhibited a maximum value with increasing total space velocity(SV_T). The maximum X_CO_2 was the level of 75.6%(T=300℃, P=1.0 MPa, H_2/CO_2=3, R=6 and SV_T=4,000㎖/g_cat.hr) in the recycle reactor when the SV_T was 5,000㎖/g_cat.hr. From the results of this study, it was found that the recycle ratio of reactant gas, effective separation of water vapor and liquid hydrocarbon, modified residence time and equilibrium conversion level of the reaction were important factors to determine the conversion level of the hydrogenation of carbon dioxide.