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Nano ZSM-5/gamma-Al2O3 composite catalyst for preparing acraldehyde by glycerol dehydration, and preparation method and application thereof

The technology of ZSM-5 and composite catalyst is applied in the field of catalyst for dehydration of glycerol to acrolein and its preparation field, which can solve the problem that the performance of the catalyst cannot be improved, and achieve the effect of good conversion rate of glycerol.

Inactive Publication Date: 2015-04-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ZSM-5 and γ-Al 2 o 3 After making a mixed catalyst, the performance of the mixed catalyst is the average of the performance of the two catalysts, so simple compounding cannot improve the performance of the catalyst

Method used

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  • Nano ZSM-5/gamma-Al2O3 composite catalyst for preparing acraldehyde by glycerol dehydration, and preparation method and application thereof
  • Nano ZSM-5/gamma-Al2O3 composite catalyst for preparing acraldehyde by glycerol dehydration, and preparation method and application thereof
  • Nano ZSM-5/gamma-Al2O3 composite catalyst for preparing acraldehyde by glycerol dehydration, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The initial gel was prepared in the following molar ratio: 1 (SiO 2 ): 0.004 (Al 2 o 3 ) : 0.3(NaOH): 0.3(KF): 0.1(TPABr ): 30(H 2O), silica sol, aluminum sulfate, and sodium hydroxide were dissolved in deionized water respectively, and potassium fluoride, tetrapropylammonium bromide, and 5wt% MFI seeds with a size of 10-200nm were added under constant stirring. The above mixture was stirred and aged at room temperature for 2 hours, then put into a stainless steel static crystallization kettle with a polytetrafluoroethylene liner, and reacted at 140° C. for 12 hours.

[0033] After crystallization, cool, filter and wash with deionized water for 3-4 times, and then dry the obtained sample at 80-120°C. The product is calcined in a muffle furnace or a tube furnace to remove the template agent, generally in an air atmosphere at 550 ° C for 4 to 6 hours. The roasted sample was ion-exchanged for three consecutive times at 80°C with 5wt% ammonium nitrate solution (solution...

Embodiment 2

[0036] The initial gel was prepared in the following molar ratio: 1 (SiO 2 ): 0.01 (Al 2 o 3 ) : 0.3 (NaOH ): 0.1 (KF ): 0.3 (TPABr ): 60 (H 2 O), silica sol, aluminum sulfate, and sodium hydroxide were dissolved in deionized water respectively, and potassium fluoride, tetrapropylammonium bromide, and 5wt% MFI seeds with a size of 10-200nm were added under constant stirring. The above mixture was stirred and aged at room temperature for 4 hours, then put into a stainless steel static crystallization kettle with a polytetrafluoroethylene liner, and reacted at 200°C for 8 hours.

[0037] After crystallization, cool, filter and wash with deionized water for 3-4 times, and then dry the obtained sample at 80-120°C. The product is calcined in a muffle furnace or a tube furnace to remove the template agent, generally in an air atmosphere at 550 ° C for 4 to 6 hours. The roasted sample was ion-exchanged for three consecutive times at 80°C with 5wt% ammonium nitrate solution (solut...

Embodiment 3-4

[0040] The steps in this embodiment are exactly the same as those in Embodiment 1 above. The difference is that during the preparation of the reaction mixture, the NaOH / Si 2 O changed from 0.3 to 0.1 and 0.8.

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Abstract

The invention belongs to the technical field of chemical industry catalysts, and particularly relates to a nano ZSM-5 / gamma-Al2O3 composite catalyst for preparing acraldehyde by glycerol dehydration, and a preparation method and application thereof. In the presence of nano ZSM-5, nano gamma-Al2O3 is prepared by a precipitation process, and the nano ZSM-5 and nano gamma-Al2O3 are uniformly mixed to obtain the composite catalyst with strong interaction. The nano ZSM-5 / gamma-Al2O3 composite catalyst solves the problems of poor ZSM-5 stability and low gamma-Al2O3 selectivity in the acraldehyde catalytic reaction by glycerol dehydration. The prepared catalyst has excellent catalytic activity, selectivity and stability in the glycerol dehydration reaction.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to a catalyst used in the reaction of glycerol dehydration to acrolein, a preparation method and application thereof. Background technique [0002] The high-value conversion and utilization technology of glycerol is an important part of biodiesel technology. The full utilization of by-product glycerol is one of the urgent problems to be solved to reduce the cost of biodiesel and promote the industrialization of biodiesel technology. It is of great significance to alleviate the energy crisis. [0003] The technology of dehydration of glycerol to produce acrolein is one of the options for high-value conversion of glycerol. The key to this reaction is to improve the stability of the catalyst and the selectivity of the product. During the dehydration process of glycerol, reactions such as cracking, condensation, and oxidation occur simultaneously, and macromolecul...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C45/52C07C47/22
Inventor 沈伟潘文雅黄亮徐华龙秦枫
Owner FUDAN UNIV
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