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Preparation method and application of Cu-based metal catalyst

A metal catalyst, a certain amount of technology, applied in the direction of catalyst activation/preparation, preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low accessibility of active metal sites, and achieve The effect of short preparation time, simple preparation method and high catalytic activity

Active Publication Date: 2017-12-29
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of heterogeneous Fe catalysts is the low accessibility of active metal sites compared to homogeneous Fe catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Cu-Fe 3 o 4 Preparation of the metal catalyst: Weigh 0.706g iron acetylacetonate and 0.26g copper acetylacetonate into a three-necked flask, then measure 10mL of dibenzyl ether, 15mL oleylamine, and 50mL of ethanol into the three-necked flask together, then Heat while stirring. Firstly, it is heated to 110°C and kept for 1 hour for dehydration, and then the temperature is raised to 300°C and kept for 2 hours for high-temperature reduction and decomposition reaction. Then cool naturally to room temperature, collect the product by centrifugation, and wash three times with hexane, ethanol, and deionized water successively. Finally, oven dry at 40°C.

[0030] (2) Catalysis of 1,2-propanediol: First, 1,2-propanediol with a concentration of 0.5mol / L, sodium hydroxide with a concentration of 0.2mol / L, water, and a catalyst with a concentration of 0.06g / L are added to the high pressure in sequence A mixed solution is formed in the reactor, and the volume ratio of the re...

Embodiment 2

[0032] Same as Example 1, only change the quality of the copper acetylacetonate weighed in the step (1) of Example 1 to 0.065, 0.13g, 0.52g, that is, the final molar ratio of Fe / Cu is 8, 4 and 1. The results obtained are shown in Table 1. The results showed that the conversion rate of 1,2-propanediol was obviously improved with the increase of Cu content, but the selectivity of lactic acid was not changed much.

[0033] The influence of different molar ratios of Fe / Cu on the conversion rate of final raw material and the selectivity of reaction product of table 1

[0034] Molar ratio of Fe / Cu

Embodiment 3

[0036] Same as Example 1, only change the concentration of 1,2-propanediol used in step (2) of Example 1 to 0.25, 1 mol / L. The results obtained are shown in Table 2. 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.

[0037] 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 2

[0038] 1,2-propanediol concentration (mol / L)

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Abstract

The invention discloses a preparation method and application of a Cu-based metal catalyst and belongs to the field of material preparation. Particularly, a Cu-Fe3O4 metal nano-catalyst is prepared in one step through a high-temperature reduction decomposition method and is used for catalyzing 1,2-propylene glycol to prepare lactic acid; the preparation method mainly comprises the following steps: 1, preparing the Cu-Fe3O4 metal catalyst; 2, catalyzing the 1,2-propylene glycol to prepare the lactic acid. According to the preparation method disclosed by the invention, the Cu-Fe3O4 metal catalyst is prepared in one step through the high-temperature reduction decomposition method and the Cu-based metal catalysts with different catalytic properties are prepared through changing a molar quantity specific value of Fe / Cu. The preparation method is simple, the needed preparation time is short and the cost is relatively low. The obtained double-metal catalyst is uniformly dispersed and has high catalytic activity and a good catalytic life.

Description

technical field [0001] The invention relates to a preparation method and application of a Cu-based metal catalyst, in particular to one-step preparation of Cu-Fe by high temperature reduction decomposition method 3 o 4 The metal nanometer catalyst is applied to catalyze 1,2-propanediol to prepare lactic acid, and belongs to the field of material preparation. Background technique [0002] Lactic acid is an important chemical, which is widely used in food additives, preservatives, carriers, co-solvents, pharmaceutical preparations, pH regulators, etc. Currently, the traditional production methods of lactic acid are fermentation and enzymatic methods. The cost of this method is high, the product is complicated, and separation and purification are difficult. Therefore, the catalytic oxidation of 1,2-propanediol as a raw material to prepare lactic acid is a new raw material route and synthetic method with important application prospects, high efficiency and environmental protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C07C51/235C07C59/08B01J37/08B01J37/16
CPCB01J23/745B01J37/086B01J37/16C07C51/235C07C59/08
Inventor 张杰冯永海陈清玉李万里刘磊
Owner JIANGSU UNIV
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