(A) study of SMSI in supported Pt catalysts by means of chemical reactions = 반응을 통한 백금담지 촉매의 금속-담체간의 상호 작용

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Catalytic activity of platinum supported on titania, γ-alumina, and silica was tested to study the SMSI in various reactions. In hydrogenation of cyclohexene, the activity of Pt/$TiO_2$ is decreased by reduction at high temperature. But oxidation followed by reduction restores the activity to the original level. This indicates the present of SMSI in Pt/$TiO_2$ . We can also find the same phenomena in silica-supported catalyst. But in dehydrogenation of cyclohexane reaction, these phenomena are found in only titania-supported catalyst and the temperature in which the SMSI can be induced shifts to higher temperature range. From the studies about SMSI and above experimental results, we suggest the mechanism that can be applied to our data. This mechanism involves two controlling steps, one of which is suppression of adsorption and the other is weakening effect of bond strength. This mechanism is based on reduction of supports. With this mechanism we can explain the SMSI as a general phenomenon in such a catalyst that can be reduced. Pt/γ-alumina catalyst was also tested to verify the redispersion phenomena. The hydrogenolysis of n-hexane on Pt/$TiO_2$ was carried out to investigate the effect of SMSI for isomerization and hydrogenolysis reactions. The yield of isomerization products showed the contrary results compared with hydrocracking products that showed the typical SMSI effects. These phenomena were interpreted by reduction of support.
Advisors
Kim, Young-Gul김영걸
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1984
Identifier
64075/325007 / 000821069
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학공학과, 1984.2, [ [ii], 60 p. ]

URI
http://hdl.handle.net/10203/30171
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=64075&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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