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Synthesis, Characterization of the Supported Heteropolyacid Catalysts and Their Catalytic Activity in the Formation Reaction of Acetals and/or Ketals

Author: WeiYunXia
Tutor: GaoJinZhang；YangWu
School: Northwest Normal University
Course: Analytical Chemistry
Keywords: Heteropoly acid ( phosphotungstic acid ) Carrier Supported catalyst Ketal ( aldehyde)
CLC: O643.36
Type: Master's thesis
Year: 2006
Downloads: 673
Quote: 0
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Abstract


Heteropoly acid is by the central atom (e.g., P, Si, Ce, Fe, etc.) and the ligand atoms (such as Mo, W, V, Nb, Ta, etc.) a certain structure of the ligand through an oxygen atom, bridging from oxygenated polyacid general term. Since heteropoly acids than the small surface area (for 1 ~ 10m 2 / g), therefore, in the practical application, the need to heteropoly acid supported on a suitable carrier in order to improve its specific surface area. Supported heteropoly acid catalyst and heteropoly acid salt to overcome the group B the heteropolyacids than the surface area is small, easy recycling of shortcomings, heterogeneous catalysis, greatly improving the catalytic performance. This paper is divided into two parts, mainly including the following: The first part of the heteropoly acid catalyzed chemical Overview 1. Heteropoly acid structure, as well as the specific nature of these structures determines. It is these special properties, before heteropolyacids acclaimed in the field of catalysis. 2. Early heteropolyacids novel heteropoly acid catalysts - Supported heteropoly acid and heteropoly salt preparation and characterization methods. 3. Heteropoly acid catalyst in alkylation, esterification, condensation, nitration, oxidation is briefly introduced. 4. Brief supported heteropoly acid catalyst research progress in the second part of the experimental study 1. \sub> / Al 2 O 3 , the method characterized by FT-IR, XRD, TG-DTA. (2) The balance impregnated Preparation the load supported heteropoly acid catalyst H 3 PW 12 O 40 / C, and be characterized. (3) Preparation and characterization of phosphotungstic acid series silver salt (Ag x H 3-x PW 12 O 40 ). 2. Catalytic synthesis of the six critical ketal (aldehyde) investigated the catalytic synthesis of some catalytic activity (aldehyde) ketal. Discussed the optimum reaction conditions. The results indicate that under optimum reaction conditions, the catalytic activity of the supported catalyst and the silver salt of phosphotungstic series were higher than those of pure phosphotungstic acid. Although the high activity phosphotungstic acid silver salt (Ag 2 PW 12 O 40 ) catalyst in the reaction, but life is short, not conducive to the continuous use ; while the load is 30% of the catalyst (H 3 PW 12 O 40 / Al 2 O 3 ) after calcination at 500 ℃, not only high catalytic activity, and longer life expectancy in the condensation reaction will be a good prospect.

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