Nano metal catalyst and preparation method and application thereof

A nano-metal and catalyst technology, which is applied in the field of nano-metal catalysts and their preparation, can solve problems such as difficult to control hydrogenation, and achieve the effects of stable metal catalysts, high reactivity, and simple preparation process

Inactive Publication Date: 2010-07-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, in order to realize the selective hydrogenation of this type of conjugated diolefins into monoolefins, the inventors designed a special catalyst, that is, coated nano-metal catalysts with a polymer coating, aiming at The steric hindrance effect improves the selective hydrogenation of the double bond of the terminal group of the conjugated diene, while the internal double bond is basically not affected, and it is difficult to control a certain double bond of this kind of reactant by using a general bare metal nanocatalyst hydrogenation
However, there are two problems to be solved. One problem is how to coat the polymer stable coating on the surface of the solid-su...

Method used

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  • Nano metal catalyst and preparation method and application thereof

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Effect test

Embodiment 1

[0016] Embodiment 1, preparation nano metal catalyst

[0017] 1) Preparation of monodisperse submicron SiO 2 particles

[0018] The ethanol solution of ethyl orthosilicate was quickly added to the ethanol solution of ammonia water, and in the final mixed solution, the molar ratio of ammonia:water:ethyl orthosilicate was 1:11:0.22. The resulting mixed solution was reacted under magnetic stirring for 4 hours at a reaction temperature of 30°C. The reacted suspension was centrifuged, washed three times with ethanol and water respectively, and dried at 100°C for 12 hours to obtain 230nm monodisperse submicron SiO 2 particles.

[0019] 2) SiO2 2 Amine functionalization of particles

[0020] 3 g SiO 2 The particles and 3.6 g of aminopropyltriethoxysilane were dispersed in 45 ml of toluene. After ultrasonic dispersion, the resulting suspension was refluxed at 110° C. for 24 hours with magnetic stirring. The refluxed suspension was centrifuged, washed three times with toluene an...

Embodiment 2

[0025] Embodiment 2, preparation nano metal catalyst

[0026] 1) Preparation of monodisperse submicron SiO 2 particles

[0027]The ethanol solution of ethyl orthosilicate was quickly added to the ethanol solution of ammonia water, and in the final mixed solution, the molar ratio of ammonia:water:ethyl orthosilicate was 1:11:0.22. The resulting mixed solution was reacted under magnetic stirring for 4 hours at a reaction temperature of 30°C. The reacted suspension was centrifuged, washed three times with ethanol and water respectively, and dried at 100°C for 12 hours to obtain 230nm monodisperse submicron SiO 2 particles.

[0028] 2) SiO2 2 Amine functionalization of particles

[0029] 3 g SiO 2 The particles and 3.6 g of aminopropyltriethoxysilane were dispersed in 45 ml of toluene. After ultrasonic dispersion, the resulting suspension was refluxed at 110° C. for 24 hours with magnetic stirring. The refluxed suspension was centrifuged, washed three times with toluene and...

Embodiment 3

[0034] Embodiment 3, preparation nano metal catalyst

[0035] 1) Preparation of monodisperse submicron SiO 2 particles

[0036] The ethanol solution of ethyl orthosilicate was quickly added to the ethanol solution of ammonia water, and in the final mixed solution, the molar ratio of ammonia:water:ethyl orthosilicate was 2:11:0.22. The resulting mixed solution was reacted under magnetic stirring for 4 hours at a reaction temperature of 30°C. The reacted suspension was centrifuged, washed three times with ethanol and water respectively, and dried at 100°C for 12 hours to obtain 500 nm monodisperse submicron SiO 2 particles.

[0037] 2) SiO2 2 Amine functionalization of particles

[0038] 3 g SiO 2 The particles and 3.6 g of aminopropyltriethoxysilane were dispersed in 45 ml of toluene. After ultrasonic dispersion, the resulting suspension was refluxed at 110° C. for 24 hours with magnetic stirring. The refluxed suspension was centrifuged, washed three times with toluene a...

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Abstract

The invention discloses a nano metal catalyst and a preparation method and an application thereof. The nano metal catalyst consists of nano Pd catalyst particles, carrier of nano Pd catalyst and a crosslink polymer coat which is wrapped on the surface of the nano Pd catalyst. The preparation method of the nano metal catalyst comprises the following steps: in the inert atmosphere, reaction monomer and comonomer are undertaken the copolymerization with the nano Pd catalyst loaded by the carrier to obtain the product. The reaction of the 2,4-dimethyl-1,3-pentylene and the propenol in the catalyzing supercritical carbon dioxide medium has high selectivity and reaction activity. The method has simple preparation process, and the metal catalyst is stable; and after the reaction is ended, the catalyst can be separated from the product through the centrifugal to be repeatedly used. By adequately integrating the steric effect of the polymer coat and the particular performance of the supercritical carbon dioxide, the nano metal catalyst has promising application prospect in the catalyzing reaction.

Description

technical field [0001] The present invention relates to a nano-metal catalyst and its preparation method and application, in particular to a nano-metal catalyst supported by a cross-linked polymer coating coating carrier and its preparation method and its high-selectivity hydrogenation reaction in supercritical carbon dioxide Applications. Background technique [0002] When hydrocarbons are cracked to produce monoolefins such as ethylene, propylene, and butene, some conjugated dienes are produced. These conjugated diolefins are easy to polymerize under the action of catalysts to form colloids during the post-processing of olefins, especially in the process of olefin polymerization, which blocks the pores of the catalyst and affects the life of the catalyst. And an effective method to remove these conjugated diolefins is exactly the selective hydrogenation of conjugated diolefins to corresponding monoolefins without the generation of alkane (Munro S and ColmanP.Effect of Tol...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J21/08B01J31/06B01J37/02C07C5/05C07C11/02C07C29/17C07C31/10
CPCY02P20/54
Inventor 吴天斌韩布兴姜涛侯民强樊红雷张兆富张建玲杨冠英
Owner INST OF CHEM CHINESE ACAD OF SCI
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