C@TiO2 solid acid catalyst in core-shell structure and preparation method thereof

A technology of solid acid catalyst and core-shell structure, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of harsh preparation conditions, difficult industrial application, and low acid density. Simple, stable performance, the effect of increasing acid strength

Active Publication Date: 2015-03-04
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many researchers have noticed this and vigorously developed solid acid catalysts. Although there are many types of solid acids that have been developed, they also have certain defects. The main problem is that th

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Example 1

[0018] A core-shell structure of CTiO 2 The preparation method of solid acid catalyst, the concrete steps are:

[0019] (1) Dissolve 5 g of starch in 100 mL of water and stir until it is completely dissolved; then add 10 mL of tetrabutyl titanate dropwise to the solution and stir evenly to prepare an emulsion; transfer the emulsion to polytetrafluoroethylene In a stainless steel autoclave lined with ethylene, the reaction was carried out at 100 °C for 24 h, the product was filtered, washed with anhydrous ethanol, and dried at 50 °C to obtain powder; the powder was placed in a dry N 2 Under the atmosphere, pyrolyze at 200 °C for 90 minutes to obtain a catalyst precursor with a core-shell structure;

[0020] (2) Grind the precursor into powder, hydrothermally sulfonated with 1 mol / L sulfuric acid at 200 °C; then washed with deionized water until no sulfate ions were detected; finally dried at 50 °C for 24 hours to obtain the nucleus Shell-structured CTiO ...

Example Embodiment

[0021] Example 2

[0022] A core-shell structure of CTiO 2 The preparation method of solid acid catalyst, the concrete steps are:

[0023] (1) Dissolve 10g of sucrose in 150mL of water, and stir until completely dissolved; then add 15mL of tetrabutyl titanate dropwise to the solution, stir evenly, and prepare an emulsion; transfer the emulsion to polytetrafluoroethylene In a stainless steel autoclave lined with ethylene, the reaction was carried out at 200 °C for 6 h, the product was filtered, washed with absolute ethanol, and dried at 105 °C to obtain powder; the powder was placed in a dry N 2 Under the atmosphere, pyrolyze at 500 °C for 60 minutes to obtain a catalyst precursor with a core-shell structure;

[0024] (2) Grind the precursor into powder, hydrothermally sulfonated with 3 mol / L sulfuric acid at 150 °C; then washed with deionized water until no sulfate ions were detected; finally dried at 105 °C for 5 hours to obtain the nucleus Shell-structured CTiO 2 Solid...

Example Embodiment

[0025] Example 3

[0026] A core-shell structure of CTiO 2 The preparation method of solid acid catalyst, the concrete steps are:

[0027] (1) Dissolve 20 g of cellulose in 200 mL of water and stir until completely dissolved; then add 20 mL of tetrabutyl titanate dropwise to the solution, stir evenly to prepare an emulsion; transfer the emulsion to polytetrafluoroethylene In a stainless steel autoclave lined with vinyl fluoride, the reaction was carried out at 150 °C for 13 h, the product was filtered, washed, and dried at 75 °C to obtain powder; the powder was placed in a dry N 2 Under the atmosphere, pyrolyze at 350 °C for 75 minutes to obtain a catalyst precursor with a core-shell structure;

[0028] (2) Grind the precursor into powder, hydrothermally sulfonated with 5 mol / L sulfuric acid at 100 °C; then washed with deionized water until no sulfate ions were detected; finally dried at 75 °C for 13 hours to obtain the nucleus Shell-structured CTiO 2 Solid acid catalyst...

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Abstract

The invention belongs to the preparation field of catalysts, and in particular relates to a C@TiO2 solid acid catalyst in a core-shell structure and a preparation method of the C@TiO2 solid acid catalyst. The main preparation process is as follows: reacting biomass and tetrabutyl titanate serving as raw materials for 6-24 hours at 100-200 DEG C, drying and pyrolyzing the product to obtain a catalyst precursor in the core-shell structure, sulfonating the catalyst precursor through sulfuric acid, and drying to obtain the C@TiO2 solid acid catalyst in the core-shell structure. The catalyst has good catalysis activity and stability in acid alcohol esterification and transesterification. The raw material for the catalyst disclosed by the invention is cheap and easy to obtain, the performance is stable, and the large-scale production can be realized. Furthermore, the catalyst solves the common fault that the normal metallic oxide solid acid catalyst is easy to inactivate, and meanwhile, the acid density is increased, so that the acid strength is greatly prompted, the catalysis effect is good, and the catalyst is reusable and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of preparation of catalysts, in particular to CTiO with a core-shell structure 2 Solid acid catalyst and its preparation method. Background technique [0002] In the chemical industry, many reactions need to be carried out under acid-catalyzed conditions, such as hydrocarbon cracking, alkyl isomerization, hydrolysis, alkyd esterification and transesterification. Traditional acid catalysts are mainly inorganic liquid acids, mainly HF, HCl, H 2 SO 4 、H 3 PO 4 etc., although the catalytic effect of these liquid acid catalysts is better, there are many weak points. For example, it is extremely easy to corrode equipment, endanger the safety of operators, can only be applied to batch processes, has poor product selectivity, and the separation steps from products are complicated. In addition, it will inevitably cause serious environmental pollution, especially in the environment where the "green chemical industry" is v...

Claims

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Application Information

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IPC IPC(8): B01J27/053C07C69/58C07C67/08
Inventor 牛玉李福颖王仁章杨金杯董国文
Owner SANMING UNIV
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