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Preparation、Characterization of Supported-type Platinum Catalysts and Study of Its Catalytic Activities

Author: ZhouMingHua
Tutor: ZhanZhengKun
School: Central China Normal University
Course: Physical and chemical
Keywords: Surface Modification Supported catalyst Preparation and Characterization Dehydrogenation epoxidation Hydrogenation reaction Catalytic activity Hydrotalcite Composite oxide
CLC: O643.3
Type: Master's thesis
Year: 2003
Downloads: 500
Quote: 2
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Abstract


Work of this paper is divided into two parts: ① supported platinum catalyst preparation, characterization and catalytic performance tests, ② CoCr, ZnCr series hydrotalcite mixed oxide activity. Pt metal in the catalytic industry has a wide range of uses, particularly in the petrochemical industry is an important reforming catalyst. Therefore, in the first part, we use γ-GOPS carrier γ-Al 2 O 3 the surface is modified, and then the modified γ-Al O 3 for the carrier, the single metal supported catalyst containing Pt and Pt-Re synthesized a series of supported catalysts of the double metal bonded - dipping method. Γ-GOPS 2 O 3 of the surface properties of γ-Al, surface area measurement, infrared spectroscopy, continuous temperature-programmed desorption NH 3 , n-butylamine titration method and pyridine adsorption test. Γ-GOPS with γ-Al 2 O-3 hydroxyl carrier key cooperation with scattered γ-Al 2 O 3 on the upper surface, and the bonding reaction is stoichiometric, can be strictly controlled by calculating and weighing the amount of γ-GOPS graft. By the functionalization of the surface of the γ-GOPS, the bonding of γ-Al 2 O 3 after high temperature calcination may be formed on the surface with a strong acidic Lewis acid centers, and γ -Al 2 O 3 surface to increase the total amount of acid. 2 O 3 and the interaction between the Pt, temperature-programmed reduction, temperature-programmed desorption of hydrogen and hydroxide titration for the bonding of gamma-AL its characterized proved H 2 the PtCl 6 and γ-Al the 2 O 3 -b occurred chemical The role of the site of action is connected to the Al atoms and Si atoms. The bonding - prepared by impregnation of Pt / γ-Al 2 O 3 Pt--Re/γ-Al 2 O 3 catalyst reduction temperature lower than the catalysts prepared by conventional impregnation method and much more apparent degree of dispersion and cryogenic center. Bonded - prepared by impregnation of Pt and Pt-Re catalysts, Pt, Re can be evenly dispersed in the carrier of the outer layer. The hydrogenation reaction on the catalytic performance of the catalyst, we chromatography technique of micro-catalytic dehydrogenation of n-hexane of ethylene and benzene is a probe for the test experiment. The results showed that after bonding to γ-Al 2 O 0 3 as the carrier, with the bond - prepared by impregnation of a single metal catalyst activity than the conventional impregnation method better prepared, after bonding of γ-Al 2 O 3 for the carrier, the obtained Pt, Re double metal supported catalyst activity is superior to single the activity of the metal catalyst. All the catalyst prepared in a high degree of hydrogenation and hydrogenolysis activity. Two parked back within l master's degree thesis W MASTER'S THESIS In the second part, we CoCr, ZnCr hydrotalcite precursor, the activity of the mixed oxide from different processing temperatures tested. By dehydration of ethanol catalytic activity of the dehydrogenation reaction, we have come to the surface of these catalysts have more alkali centers, while the content of the acid centers.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic
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