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Nano-composite catalyst and preparation method thereof

A nanocomposite and catalyst technology, applied in the field of catalysis, can solve the problems of poor catalytic performance and low degree of nanocomposite, and achieve the effects of high degree of recombination, improved atom utilization rate, and high-efficiency catalytic performance

Active Publication Date: 2012-08-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of low nanocomposite degree and poor catalytic performance of the existing supported nanocomposite oxide catalyst, the present invention provides a nanocomposite catalyst and a preparation method thereof

Method used

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  • Nano-composite catalyst and preparation method thereof

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preparation example Construction

[0024] The preparation method of nanocomposite catalyst provided by the invention, its concrete steps are as follows:

[0025] Step 1: preparing non-stoichiometric or stoichiometric composite oxides by sol-gel method, impregnation method, Penichi method, co-precipitation method, deposition precipitation method, etc.;

[0026] Step 2: Put the composite oxide prepared in step 1 into a U-shaped tube, add a reducing agent, and reduce the composite oxide lattice or the first type of metal ion doped in the lattice at 500°C-1000°C in an inert reducing atmosphere , the reduction time is 0.5h-1h, and the nano-metal particles containing the first type of metal are obtained;

[0027] Step 3: Soak the reduced nanometer metal particles in the nitrate solution containing the second type of metal ions, filter after 0.5h-24h, wash with water, dry, and roast to obtain a nanocomposite catalyst;

[0028] The first type of metal is one or more of Co, Ni, Cu, Bi, and the second type of metal is o...

Embodiment 1

[0034] Weigh 0.01mol of aluminum isopropoxide (2.04g) and dissolve it in 180ml of water, stir to dissolve at 80°C, then add 1.5ml of concentrated nitric acid, heat to 90°C and keep for 3h to obtain a clear aluminum sol. Add 0.001mol nickel nitrate (0.291g) to the above aluminum sol, stir for 2h, then evaporate to the gel point at 100°C. The resulting gel was dried under vacuum at 100°C overnight, and then calcined at 700°C for 4 hours to obtain non-stoichiometric NiAl 2 o 4 spinel carrier. Weigh 2.5g of the carrier and put it into a U-shaped tube, 5%H 2 / Ar atmosphere at 750°C-1000°C for 1h, cooled to room temperature under the protection of reducing atmosphere, and immersed the reduced sample in 10ml 0.43mol / L Pd(NO 3 ) 2 solution, filtered after 0.5h, washed with water, dried and calcined to obtain Catalyst 1. Finally, the catalyst is pressed into tablets, ground, and sieved to obtain 40-80 mesh particles for later use. The obtained sample NiAl 2 o 4 , Pd / Ni-Al 2 o ...

Embodiment 2

[0036]0.01 mol of aluminum nitrate (3.75 g) and 0.01 mol of nickel nitrate (2.91 g) were weighed and dissolved in 250 ml of water. Then add 3.00 g of urea to the above solution. After the urea is completely dissolved, start heating to 95°C-100°C, and heat and stir at this temperature until evaporated to dryness. The obtained samples were dried overnight at 110°C and calcined in air at 800°C for 4 hours to obtain a stoichiometric ratio of NiAl 2 o 4 spinel carrier. Weigh 2.5g NiAl 2 o 4 Put into U-shaped tube, 5%H 2 / Ar atmosphere at 750°C-1000°C for 1h, cooled to room temperature under the protection of reducing atmosphere, and immersed the reduced sample in 10ml 0.43mol / L Pd(NO 3 ) 2 solution, filtered after 1h, washed with water, dried and calcined to obtain Catalyst 2. Finally, the catalyst is pressed into tablets, ground, and sieved to obtain 40-80 mesh particles for later use.

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Abstract

The invention provides a nano-composite catalyst and a preparation method thereof, belongs to the technical field of catalyzing, and solves the problem that the conventional load nano-composite oxide catalyst is low in nano-composite degree, and poor in catalyzing performance. The nano-composite catalyst is obtained by the flowing steps based on the condition that a surface-active agent is not used: firstly, reducing composite oxide crystal lattices or first metal ions mixed in the crystal lattices so as to obtain nano-metal granules containing first metal; and then introducing second metal into the surface of the first metal by Galvanic substitution reaction so as to obtain the nano-composite catalyst. Compared with the conventional catalyst, the nano-composite catalyst has more efficient catalyzing performance when being used for catalytic reaction of VOC (volatile organic compound) removal, automobile tail gas purification, formaldehyde removal, methane combustion, hydrogenation, hydrogenolysis, ammonia synthesis, ammonia decomposition, hydrocarbon synthesis, hydroformylation and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a nanocomposite catalyst and a preparation method thereof. Background technique [0002] Catalysts are widely used in chemical production processes, such as: fuels, high-temperature lubricants, polymers, rubber and pharmaceuticals in the synthesis of catalysts are essential. Catalysts also play a huge role in environmental protection fields such as the elimination of pollutants such as automobile exhaust. Nano-catalysis is a branch that has developed rapidly in the field of catalysis in recent years. Compared with traditional catalysis, nano-catalysis can greatly improve the composition of active components and supports, especially the size and shape of the catalyst. activity and selectivity. The existing nanocatalyst preparation method generally includes two parts, firstly, the synthesis of nanoparticles, that is, the active components, and then loading the nanop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 杨向光潘喜强张一波张彬苗珍珍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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