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Application of ZSM-5 molecular sieve loaded cobalt catalyst in preparation of cinnamyl alcohol

A technology of ZSM-5, 1. ZSM-5 is applied in the application field of preparing cinnamyl alcohol, and achieves the effects of strong selectivity, easy control of reaction conditions and improved conversion rate

Inactive Publication Date: 2013-04-17
ZHEJIANG PHARMA COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no application of molecular sieve ZSM-5 supported Co catalysts in the selective hydrogenation of cinnamaldehyde

Method used

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  • Application of ZSM-5 molecular sieve loaded cobalt catalyst in preparation of cinnamyl alcohol
  • Application of ZSM-5 molecular sieve loaded cobalt catalyst in preparation of cinnamyl alcohol
  • Application of ZSM-5 molecular sieve loaded cobalt catalyst in preparation of cinnamyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using cinnamaldehyde 5ml as raw material, ZSM-5 molecular sieve loaded cobalt catalyst, hydrogenation conditions were carried out continuously for more than 6 hours, wherein the reaction pressure was 2Mpa, the reaction temperature was controlled at 100°C, and the reaction solvent was 130ml ethanol. Among them, the silicon in the catalyst The aluminum ratio is 25, and the mass content of the cobalt catalyst supported by the ZSM-5 molecular sieve is 16.7%. The calcination temperature of the cobalt catalyst supported by the ZSM-5 molecular sieve in this example is 600° C. during the preparation process. The result is as figure 1 shown.

[0023] From figure 1 It can be seen that the reactants and products change with time during the hydrogenation reaction of cinnamaldehyde. It can be seen from the figure that in the initial stage of the reaction, the content of cinnamyl alcohol rises rapidly, while the contents of hydrogenated cinnamaldehyde and hydrogenated cinnamyl alco...

Embodiment 2

[0025] With the same reaction situation of embodiment 1, compare the relation between the selectivity of each product and conversion rate, obtain the result as follows figure 2 As can be seen from the figure, the content of hydrogenated cinnamaldehyde and acetal by-products is relatively low. When the conversion rate of cinnamaldehyde is less than 80%, the selectivity of cinnamyl alcohol is maintained at about 78%. After further reaction, the selectivity of cinnamyl alcohol decreases rapidly, and cinnamyl alcohol further generates hydrogenated cinnamyl alcohol.

Embodiment 3

[0027] With different catalysts as contrast test, compare in the cinnamyl alcohol preparation process, use parameters such as the efficiency of different catalysts, reaction condition is identical with embodiment 1, concrete result is as follows:

[0028]

[0029] As can be seen from the above table, in the selective hydrogenation reaction of cinnamaldehyde, the carrier has a greater impact on the selectivity of hydrogenation performance and product. We prepared cobalt catalysts supported on alumina, zirconia, magnesia, oxidation states and ZSM-5 molecular sieves, and investigated their reactivity in the selective hydrogenation of cinnamaldehyde. The carrier has a great influence on the activity of the catalyst and the hydrogenation performance of the product. After 6 hours of reaction, the catalysts supported by alumina, magnesia and titania have a hydrogenation conversion of 4.7%, 1.4% and 3.6%, respectively, and their reactivity is very high. Low. The catalyst supported...

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PUM

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Abstract

The invention discloses a method for producing cinnamyl alcohol and specifically relates to application of a ZSM-5 molecular sieve loaded cobalt catalyst in preparation of cinnamyl alcohol. Cinnamyl aldehyde is taken as a raw material, and reacts continuously for 6 hours in the presence of the ZSM-5 molecular sieve loaded cobalt catalyst under the hydrogenation condition, thereby generating the cinnamyl alcohol, and ethanol is used as a solvent, and the dosage volume ratio of the cinnamyl aldehyde to the solvent is 1: (10-50); and the reaction conditions are as follows: temperature 100 DEG C and pressure 2 Mpa. According to the invention, the conversion ratio of the cinnamyl alcohol can be effectively improved, the selectivity is high, the reaction conditions are easy to control, and the like.

Description

technical field [0001] The invention relates to a production method of cinnamyl alcohol, in particular to the application of ZSM-5 molecular sieve-supported cobalt catalyst in the preparation of cinnamyl alcohol. Background technique [0002] Selective hydrogenation of unsaturated aldehydes to unsaturated alcohols is an important chemical reaction, and cinnamaldehyde is a typical representative of α-β unsaturated aldehydes, and its selective hydrogenation to cinnamyl alcohols has been extensively studied by researchers. At present, noble metal catalysts such as Pt, Ru, Pd, and Au and non-noble metal catalysts Co have been studied in the selective hydrogenation of cinnamaldehyde. Due to the high selectivity and low price of non-precious metal catalysts, the disadvantage is that the activity is not high. Therefore, how to improve its activity is a direction of research. [0003] In the selective hydrogenation process, the carrier has an important influence on the activity and...

Claims

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Application Information

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IPC IPC(8): C07C33/32C07C29/141C07C29/17C07C33/20C07C45/62C07C47/228
Inventor 许莉勇张新波张斌秦永华张雅娟
Owner ZHEJIANG PHARMA COLLEGE
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