Characterization of cobalt-supported catalyst = 코발트담지 촉매에 대한 특성 연구

It was reported that the characteristics of cobalt - supported catalyst present a marked contrast with the methods of preparation, and in the case of Co/$SiO_2$, several kinds of cobalt species are formed after calcination. Catalysts were prepared by an impregnation method using cobalt acetate and cobalt nitrate. Physicochemical characterization of prepared Co/$SiO_2$ catalysts by cobalt acetate and cobalt nitrate were carried out to reveal the interaction between cobalt and $SiO_2$ about using PAS, XRD, TPDe, TPR, IR techniques. Interaction modes between cobalt and silica present a contrast with the nature of anions of cobalt source. It was found that several kinds of cobalt species are formed on Co/$SiO_2$. These species are assigned to $Co_3O_4$, mixed oxide, and $Co^{2+}$ in Td. Their proportions strongly depend on the starting salt, cobalt content, and preparation method. In either case, cobalt has octahedral symmetry before calcination, but in the case of Co/$SiO_2$ (A), it changes tetrahedral symmetry during calcination. These results are interpreted to be related to the interaction modes of cobalt-silica and cobalt-anion.
Advisors
Chon, Hak-Zeresearcher전학제researcher
Publisher
한국과학기술원
Issue Date
1993
Identifier
68368/325007 / 000911431
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 1993.2, [ vi, 71 p. ]

URI
http://hdl.handle.net/10203/32638
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=68368&flag=t
Appears in Collection
CH-Theses_Master(석사논문)
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