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La2O3 cluster modified Ni/SiO2 nano composite catalyst and preparation method thereof

A nanocomposite and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor stability, achieve easy operation, and reduce production costs , Excellent catalytic stability effect

Inactive Publication Date: 2019-05-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose a La 2 o 3 Cluster Modified Ni / SiO 2 Nanocomposite catalysts to solve the problem of poor stability of existing nanocomposite catalysts in methane dry reforming reactions

Method used

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  • La2O3 cluster modified Ni/SiO2 nano composite catalyst and preparation method thereof
  • La2O3 cluster modified Ni/SiO2 nano composite catalyst and preparation method thereof
  • La2O3 cluster modified Ni/SiO2 nano composite catalyst and preparation method thereof

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Embodiment 1

[0042] La in this example 2 o 3 Cluster Modified Ni / SiO 2 The nanocomposite catalyst consists of mesoporous silica with a mesoporous diameter of 9.6nm, nickel nanocrystals with an average particle diameter of 4.5nm and lanthanum oxide (La 2 o 3 ) composition; nickel nanocrystals are supported on mesoporous silica, and the surface of nickel nanocrystals is attached with lanthanum oxide, wherein, the molar number of lanthanum in lanthanum oxide is La 2 o 3 Cluster Modified Ni / SiO 2 2% by mole of nanocomposite catalyst.

[0043] Prepare the La of the present embodiment according to the following method 2 o 3 Cluster Modified Ni / SiO 2 Nanocomposite catalyst, it specifically comprises the following steps:

[0044] 1) Weigh 26.4306g Na 2 SiO 3 9H 2 O in a beaker, then, add 87.2154g deionized water and keep stirring until Na 2 SiO 3 9H 2 O is completely dissolved to give 10% Na by mass fraction 2 SiO 3 solution, subsequently, under continuous magnetic stirring condit...

Embodiment 2

[0062] La in this example 2 o 3 Cluster Modified Ni / SiO 2 The nanocomposite catalyst consists of mesoporous silica with a mesoporous diameter of 7.3nm, nickel nanocrystals with an average particle diameter of 4.2nm and lanthanum oxide (La 2 o 3 ) composition; nickel nanocrystals are supported on mesoporous silica, and the surface of nickel nanocrystals is attached with lanthanum oxide, wherein, the molar number of lanthanum in lanthanum oxide is La 2 o 3 Cluster Modified Ni / SiO 2 0.5% by mole of nanocomposite catalyst.

[0063] Prepare the La of the present embodiment according to the following method 2 o 3 Cluster Modified Ni / SiO 2 Nanocomposite catalyst, it specifically comprises the following steps:

[0064] 1) Weigh 26.8569g Na 2 SiO 3 9H 2 O in a beaker, then, add 88.6221g deionized water and keep stirring until Na 2 SiO 3 9H 2 O is completely dissolved to give 10% Na by mass fraction 2 SiO 3 solution, subsequently, under continuous magnetic stirring cond...

Embodiment 3

[0071] La in this example 2 o 3 Cluster Modified Ni / SiO 2 The nanocomposite catalyst consists of mesoporous silica with a mesoporous diameter of 10.3nm, nickel nanocrystals with an average particle diameter of 4.7nm and lanthanum oxide (La 2 o 3 ) composition; nickel nanocrystals are supported on mesoporous silica, and the surface of nickel nanocrystals is attached with lanthanum oxide, wherein, the molar number of lanthanum in lanthanum oxide is La 2 o 3 Cluster Modified Ni / SiO 2 1% by mole of nanocomposite catalyst.

[0072] Prepare the La of the present embodiment according to the following method 2 o 3 Cluster Modified Ni / SiO 2 Nanocomposite catalyst, it specifically comprises the following steps:

[0073] 1) Weigh 26.7148Na 2 SiO 3 9H 2 O in a beaker, then, add 88.1532g deionized water and keep stirring until Na 2 SiO 3 9H 2 O is completely dissolved to give 10% Na by mass fraction 2 SiO 3 solution, subsequently, under continuous magnetic stirring conditi...

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Abstract

The invention provides a La2O3 cluster modified Ni / SiO2 nano composite catalyst and a preparation method thereof. The La2O3 cluster modified Ni / SiO2 nano composite catalyst is prepared from mesoporoussilica, nickel nanocrystals and lanthanum oxide, wherein the nickel nanocrystals are loaded on the mesoporous silica, and the lanthanum oxide is attached to the surfaces of the nickel nanocrystals. According to the La2O3 cluster-modified Ni / SiO2 nano composite catalyst, the nickel nanocrystals are taken as an active component and are loaded on the mesoporous silica, and the La2O3 is attached to the surfaces of the nickel nanocrystal for carrying out cluster modification on the surfaces of the nickel nano particles, so that the surface electronic state and the geometric structure of the nickelnano particles are changed, and then the elementary reaction of the nickel nano particles related to carbon deposition is inhibited. In addition, local domain limitation is carried out on the nickelnanocrystals by using the mesoporous silica as a carrier, and transferring and crystal grain growth of the nickel nanocrystal at a high temperature are prevented, so that the La2O3 cluster modified Ni / SiO2 nano composite catalyst has good carbon deposition resistance and sintering resistance, and then the catalyst has excellent catalytic stability in a methane dry reforming reaction.

Description

technical field [0001] The invention relates to the technical field of nanocomposite catalysts, in particular to a La 2 o 3 Cluster Modified Ni / SiO 2 Nanocomposite catalyst and its preparation method. Background technique [0002] At present, the consumption of energy by human society is increasing day by day: firstly, the population is constantly growing. In 1995, the world's per capita energy consumption was 1.51 tons of oil equivalent per person, but by 2013 it had increased to 1.80 tons of oil equivalent per person. In sharp contrast to the gradual increase in energy demand, non-renewable energy sources are increasingly depleted. The time available for oil extraction is less than a hundred years; coal will be exhausted in a few hundred years. In addition to energy issues, the greenhouse effect has attracted more and more attention. Methane is an important greenhouse gas second only to CO2, although its concentration in the atmosphere is higher than that of CO2 2 M...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/03C01B3/40
CPCY02P20/52
Inventor 李远志张戈权
Owner WUHAN UNIV OF TECH
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