Catalytic properties of alumina-supported Pt and Mo catalysts prepared by sol-gel method = 졸-겔법으로 제조한 알루미나 담지 백금과 몰리브데늄 촉매의 특성

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Physical and chemical properties of alumina-supported Pt and Mo catalysts prepared by sol-gel method were investigated by using BET, chemisorption, transmission electron microscopy (TEM), solid state $^27Al$ NMR spectroscopy, X-ray powder diffraction (XRD), and X-ray absorption fine structure (XAFS), and compared with impregnated catalysts. A series of $CoO-MoO_3/Al_2O_3$ sol-gel catalysts were also prepared to investigate whether the synergistic promotion effect by Co was observed, or not. Catalytic activities of benzene hydrogenation and ethane hydrogenolysis reaction for Pt/$Al_2O_3$ catalysts were measured. For alumina-supported Mo and Co-Mo catalysts, thiophene hydrodesulfurization (HDS) reaction was carried out. The physical properties such as BET surface area, pore size and pore volume of Pt/$Al_2O_3$ prepared by sol-gel method was not significantly changed, compared with those of impregnated catalysts. Extended X-ray absorption fine structure (EXAFS) results showed that the sizes of platinum particles in the sol-gel catalyst were less than 1 nm and were almost same as that of impregnated catalyst. However, hydrogen uptake of sol-gel catalyst was about 30 % less than that of impregnation catalysts, regardless of metal loading, which indicated that the available metal surface area for chemisorption of hydrogen gas molecules decreased in the sol-gel catalysts than in the impregnated catalysts. No distinct difference in catalytic activity of benzene hydrogenation was observed for both catalysts. However, catalytic activity of the ethane hydrogenolysis for Pt/$Al_2O_3$ sol-gel catalysts was considerably lower than that of impregnated catalyst. This result was from the difference of morphology of platinum particles. In the Pt/$Al_2O_3$ sol-gel catalyst, the platinum particles are strongly anchored into the alumina surface, which was confirmed by the higher thermal resistance against sintering of metal particles than the impregnated catalyst. The Mo/$Al_2O_3...
Park, Seung-Binresearcher박승빈researcher
한국과학기술원 : 화학공학과,
Issue Date
113079/325007 / 000935352

학위논문(박사) - 한국과학기술원 : 화학공학과, 1997.2, [ x, 114 p. ]


Alumina; Mo; Pt; Sol-Gel; Catalyst; 촉매; 알루미나; 몰리브데늄; 백금; 솔-겔

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