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A kind of preparation method and application of catalyst

A catalyst and reaction technology, which is applied in the preparation of organic compounds, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unfriendly environment and achieve good catalytic life and low dosage

Active Publication Date: 2020-01-07
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the fermentation method, this method has the characteristics of high occurrence rate, but the environment is not friendly

Method used

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  • A kind of preparation method and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of Fe 3 o 4 : Weigh 4mmol anhydrous ferric chloride (FeCl 3) was dissolved in 40 mL of diethylene glycol (DEG), so that the concentration of anhydrous ferric chloride in diethylene glycol was 0.1 mmol / mL. Then add 1.6mmol of sodium citrate and 12mmol of anhydrous sodium acetate, stir and dissolve in a water bath at 80°C. The solution was then transferred to an autoclave and reacted in an oven at 240 °C for 6 h. Then, it was washed with ethanol using a magnet to obtain a black powder, which was dried in a vacuum oven at 60°C. get Fe 3 o 4 .

[0035] (2) Preparation of HAP@Fe 3 o 4 : Weigh 1 g of Fe prepared in step 1 3 o 4 Dispersed into 35mL aspartic acid solution to obtain a concentration of 1g / 35mL Fe 3 o 4 dispersion of aspartic acid. Then, after stirring in a water bath at 80° C. for 2 h, it was washed with water. The resulting powder was then dispersed into 100 mL ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) solution, while adding...

Embodiment 2

[0040] Same as Example 1, only change the 1,2-propanediol solution in step (5) of Example 1 to 0.4, 0.6 mol / L respectively. The results obtained are shown in Table 1. The results showed that with the increase of 1,2-propanediol concentration, the conversion rate of 1,2-propanediol increased and the selectivity of lactic acid also increased slightly.

[0041] The impact of different 1,2-propanediol concentrations on the conversion rate of the final raw material and the selectivity of the reaction product in table 1

[0042] 1,2-propanediol concentration (mol / L) 1,2-propanediol conversion rate (%) Lactic acid selectivity (%) 0.2 88 62.1 0.4 91 73.5 0.6 95 78.5

Embodiment 3

[0044] Same as in Example 1, only changing the reaction temperature in step (5) of Example 1 to 60 and 80°C respectively, and then performing catalytic 1,2-propanediol reaction, the results obtained are shown in Table 2. The results showed that the conversion of 1,2-propanediol increased and the selectivity of lactic acid decreased with the increase of reaction temperature.

[0045] The influence of table 2 different reaction temperatures on the conversion rate of final raw material and the selectivity of reaction product

[0046] Reaction temperature (°C) 1,2-propanediol conversion rate (%) Lactic acid selectivity (%) 40 88 62.1 60 90 60 80 96 53.2

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Abstract

The invention relates to a preparation method and application of a catalyst and belongs to the field of material preparation. The preparation method mainly comprises the following steps: 1, preparingFe3O4; 2, preparing HAP@Fe3O4; 3, preparing Au@Pt; 4, preparing a catalyst Au@Pt / HAP@Fe3O4; and 5, preparing lactic acid through catalysis of 1,2-propanediol. The HAP@Fe3O4 loaded Au@Pt catalyst is prepared by a sol fixation method, and 1,2-propanediol is catalyzed at normal pressure to prepare lactic acid. The catalyst is low in consumption, can be highly actively and selectively used for preparing lactic acid at normal pressure and has a favorable catalytic life. Meanwhile, owing to existence of Fe3O4, the catalyst can be reclaimed easily by use of the magnetism of Fe3O4 and re-utilized.

Description

technical field [0001] The present invention relates to a catalyst preparation method and its application, in particular to the preparation of gold@platinum / hydroxyapatite@iron tetroxide (Au@Pt / HAP@Fe 3 o 4 ) catalyst, which is applied to catalyze 1,2-propanediol to prepare lactic acid under normal pressure, and belongs to the field of material preparation. Background technique [0002] Lactic acid is commonly used as a fine chemical in the preparation of pharmaceuticals, cosmetics, fibers, leather and baked goods. Lactic acid is usually prepared in industry by reacting acetonitrile and hydrocyanic acid and then hydrolyzing it with sulfuric acid. Compared with the fermentation method, this method has the characteristics of high occurrence rate, but the environment is not friendly. However, chemical methods for preparing lactic acid from biorenewable resources such as glycerol and 1,2-propanediol have attracted intense attention from researchers. Since 1,2-propanediol has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185C07C51/235C07C59/08
CPCY02P20/584
Inventor 冯永海张杰糜建立陈清玉李万里刘磊
Owner JIANGSU UNIV
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