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Oxide-supported gold catalysts in the liquid phase oxidation of alcohols and hydrogen transfer reaction of

Author: SuFangZheng
Tutor: CaoYong
School: Fudan University
Course: Physical and chemical
Keywords: Gold catalyst Oxide Oxidation of alcohols Oxidative esterification Ester Hydrogen transfer reaction
CLC: O643.32
Type: Master's thesis
Year: 2009
Downloads: 245
Quote: 0
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Abstract


Since the discovery of gold catalysts at low temperatures Catalyst for CO Oxidation Catalyzed by Gold will carry out a wide range. In the gold catalytic applications in the field, under relatively mild reaction conditions, through efficient oxidation and reduction reaction of chemical synthesis and related organic reaction is more challenging and compelling topics. In this paper, oxide-supported gold particles as a catalyst, used in liquid-phase organic reactions, including alcohol oxidation, esterification and hydrogen transfer reactions. We found that due to the carrier - metal interaction, the carrier can affect the nature of the gold particles, and thus plays an important role in the reaction; gold particle has a certain characteristic vector is capable of stably and to promote certain steps in the reaction, Thus, these vectors can also be used as a cocatalyst for the reaction to achieve the gold catalyst versatility purpose. In the first part of the oxidation of alcohols, gold nanoparticles supported on different crystal gallium oxide and solvent-free oxidation of benzyl alcohol reaction. The results prove that the gold catalyst in this reaction, the load of the gallium oxide is higher catalytic activity and better selectivity of the catalyst. Moreover, the performance of different crystal gallium oxide gold catalyst load a different catalytic properties, which γ-Ga 2 O 3 as the carrier of the gold catalyst activity and The highest selectivity. In the second part of the work, we selected a different molar ratio of gallium - aluminum composite oxide as a gold catalyst carrier, and used in the alcohol oxidation reaction with oxygen as the oxidant. Found in the alcohol oxidation reaction rate of each catalyst under the action of a linear relationship with each catalyst having an alcohol dehydrogenation ability, which shows the dehydrogenation ability of the gold catalyst is in the oxidation of alcohols to obtain the high activity of one of the key factors. In addition, Au / Ga 3 Al 3 O 9 catalyst in solvent-free 1 - phenylethanol oxidation can get 25,000 h - 1 TOF values, oxidation and catalytic benzyl alcohol and phenethyl alcohol in the case of it at room temperature and without additives. In reaction step preparation of carboxylic acid esters, we found that nano-the Jing beta-Ga 2 O 3 load nano-gold catalyst can be used as an efficient bifunctional catalyst, it can oxidative esterification reaction of the catalytic alcohols, aldehydes and acetals in the relatively mild reaction conditions. Compared to the traditional carrier (TiO 2 , Fe 2 O 3 and activated carbon), the Beta-Ga 2 O 3 with the Lewis acid characteristics can be designed with a dual-function gold catalyst, and the catalyst to promote the preparation of carboxylic acid esters are two completely different reaction mechanism, a series of reactions in order to achieve the purpose. Successful example of revelation in the hydrogen transfer reaction by other noble metal catalysts (Pd, Pt and Ru), we also tried the feasibility of the gold catalyst in the reaction. Hydrogen transfer reactions found in the additive base assist, TiO the 2 gold catalyst can efficiently load and high selectivity in catalytic hydrogenation reaction of the carbonyl compound. In addition, the size of the ZnO load of about 1 nm gold nanoparticles quantum dots catalyst alkali catalytic system the reduction of the nitro-compound in the same catalytic system, and other noble metal catalysts (Pd, Pt and Ru) no catalytic activity.

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