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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.37, No.1, 27-33, 1999
Co-Bi-Fe-Mo 다성분 혼합산화물 촉매의 구조특성이 프로필렌의 산화반응에 미치는 영향
Effect of the Structure and Morphology of Multicomponent Co-Bi-Fe-Mo Oxide Catalysts on the Propylene Oxidation
황태수, 박대원, 최명재, 정종식
Co, Bi, Fe, Mo를 포함한 다성분 촉매가 프로필렌 산화반응에 미치는 영향을 알아보기 위하여 여러 종류의 촉매를 제조, 그 구조 특성을 BET, SEM, EPMA, ESCA 및 XRD로 살펴보고 반응특성과 연관지어 연구하였다. CM(Co, Mo 함유염의 공침)의 경우 CoMoO4 단일상으로 구성되어 있으며 BFM(Co, Bi, Mo의 공침)의 경우 육각판상 형태의 MoO3 입자와 이 입자위에 α-Bi2MO3O12(BM), Fe2(MoO4)3(FM) 상이 작은입자로 분산된 혼합입자로 구성되어 있었다. CM/BFM(CM상을 전기 BFM 입자위에 공침법으로 담지시킴)은 MoO3입자위에 CM, BM, FM이 작은 입자로 분산되었으나 BFM/CM(BFM을 CM입자위에 공침 담지시킴)은 분산되지 못하고 CM과 BFM의 기계적 혼합물로 존재했다. CBFM 4성분 (Co, Bi, Fe, Mo)공침촉매들은 성상이 CM/BFM촉매와 비슷하였으나 CM상이 더 잘게 분산되어 있고 이 작은 CM 입자위에 BM이 추가로 피복되어 있었다. 촉매활성은 물리적 혼합물
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-Bi2Mo3O12 (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 mixture2-oxidizing CM and hydrocarbon-oxidizing BM. The dispersion of the latter is more important because of its slower oxidation rate.
Keywords: Mo-Bi Multimetallic Oxides; Catalyst Preparation; Phase Identification; Phase Cooperation; Propylene Oxidation
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