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High-thermal-stability aluminum oxide/nickel/aluminum oxide sandwich structure catalyst as well as preparation method and application thereof

A sandwich structure, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor activity and thermal stability, achieve carbon deposition inhibition, broad application prospects, high activity Effect

Inactive Publication Date: 2017-11-24
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above catalysts are not suitable for CH 4 -CO 2 In the reforming reaction, and its activity and thermal stability are poor

Method used

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  • High-thermal-stability aluminum oxide/nickel/aluminum oxide sandwich structure catalyst as well as preparation method and application thereof
  • High-thermal-stability aluminum oxide/nickel/aluminum oxide sandwich structure catalyst as well as preparation method and application thereof
  • High-thermal-stability aluminum oxide/nickel/aluminum oxide sandwich structure catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Will contain 0.169g NiCl 2 ·6H 2 O aqueous solution impregnated in 1.0 g γ-Al 2 o 3 Stand on the carrier overnight, dry in an oven at 100°C, then raise the temperature to 800°C at a rate of 2°C / min, and keep it for 4 hours to prepare Ni / Al 2 o 3 The supported catalyst is named 4NiAl.

Embodiment 2

[0040] With trimethylaluminum (TMA) and water as the reaction source, the deposition temperature was set at 200 °C, and the working pressure of the reaction chamber was maintained at 0.3 The substrate adopts K9 glass and JGSl quartz glass with a diameter of 30mm and a thickness of 2mm. Under this condition, in embodiment 1 gained Ni / Al 2 o 3 Deposition of 40 layers of Al on the surface of the supported catalyst 2 o 3 Thin film, prepared 40-Al 2 o 3 / Ni / Al 2 o 3 Sandwich structure catalyst named as 4NiAl-40ALD catalyst.

Embodiment 3

[0042] With trimethylaluminum (TMA) and water as the reaction source, the deposition temperature was set at 200 °C, and the working pressure of the reaction chamber was maintained at 0.3 The substrate adopts K9 glass and JGSl quartz glass with a diameter of 30mm and a thickness of 2mm. Under this condition, in the Ni / Al obtained in embodiment 1 2 o 3 Deposit 80 layers of Al on the surface of supported catalyst 2 o 3 thin film, prepared 80-Al 2 o 3 / Ni / Al 2 o 3 Sandwich structure catalyst named as 4NiAl-80ALD catalyst.

[0043] Depend on figure 1 , 2 Visible, rod-shaped γ-Al 2 o 3 The surface of the carrier is covered with a layer of Al 2 o 3 Thin film, surface covered Al in 4NiAl-40ALD catalyst 2 o 3 The thickness of the film is about 4nm, and the Al covered on the surface of the 4NiAl-80ALD catalyst 2 o 3 The film thickness is about 8nm.

[0044] Depend on image 3 It can be seen from the TPR spectrum that the reduction peak of NiO in 4NiAl-80ALD moves to ...

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Abstract

The invention relates to a high-thermal-stability aluminum oxide / nickel / aluminum oxide sandwich structure catalyst as well as a preparation method and application thereof. The high-thermal-stability Al2O3 / Ni / Al2O3 sandwich structure catalyst is of a sandwich structure and comprises a gamma-Al2O3 substrate layer, a Ni nano particle layer located on the gamma-Al2O3 substrate layer, and an inertia Al2O3 thin film located on the Ni nano particle layer. The high-thermal-stability Al2O3 / Ni / Al2O3 sandwich structure catalyst is used in CH4-CO2 reforming reaction. Compared with the prior art, the inner-layer Al2O3 carrier and the outer-layer Al2O3 thin film well protect and stabilize Ni nano particles to prevent the particles from being agglomerated and sintered, so that carbon deposition, poisoning and the like in a reaction process can be suppressed, and the catalyst is high in thermal stability; moreover, the catalyst has high activity and has a good application prospect in CH4-CO2 reforming reaction and other high-temperature thermo-catalysis reactions.

Description

technical field [0001] The present invention relates to a kind of catalyst material and preparation method thereof, especially relate to a kind of high thermal stability Al 2 o 3 / Ni / Al 2 o 3 Sandwich structure catalyst and its preparation method and application. Background technique [0002] In recent years, the demand for energy has been large and highly increased, and most of the energy comes from fossil fuels, resulting in a large amount of CO 2 Emissions not only lead to the greenhouse effect, but also cause a great waste of resources. CH 4 -CO 2 The reforming reaction can convert CO 2 with CH 4 converted to H 2 Syngas with a low ratio of / CO (<1) can not only solve environmental problems, but also realize the resource utilization of pollutants. [0003] Metal Ni in CH 4 -CO 2 The catalytic activity in the reforming reaction is close to that of noble metals, and the price is low, which is more suitable for industrial applications. However, Ni catalysts a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C01B3/40
CPCC01B3/40B01J23/755C01B2203/1241C01B2203/1058C01B2203/0238B01J35/394B01J35/393B01J35/50Y02P20/52
Inventor 赵羽康运卿李辉李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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