Modified CeO2 nanorod-doped catalyst and application thereof

A catalyst and modification technology, used in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, and catalytic treatment of combustible gases, etc. , easy sintering and oxidation problems, to achieve the effect of improving thermal stability and inverse water gas shift reaction performance, reducing the activation energy of oxygen ion diffusion, and improving high temperature stability

Active Publication Date: 2017-03-15
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, through the efforts of researchers, a variety of reverse water gas shift reaction catalysts have been developed, but there are defects such as poor stability, easy sintering at high temperature, and easy deactivation. For example, copper-based catalysts are easy to sinter and oxidize under high temperature conditions, resulting in catalyst deactivation. ; Zinc-aluminum catalysts are prone to reduction and deactivation under high temperature conditions; platinum-cerium catalysts are prone to carbon deposition and deactivation during the reaction process
In addition, the conversion rate and selectivity of many catalysts also have many shortcomings, so the research and development of reverse water gas shift reaction catalysts with high activity and high stability is of great significance for the resource utilization of carbon dioxide and the production of organic chemical products.

Method used

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  • Modified CeO2 nanorod-doped catalyst and application thereof
  • Modified CeO2 nanorod-doped catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 0.0172g Zr(NO 3 ) 4 ·5H 2 O and 1.736g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 70ml of distilled water and stirred for 30min to obtain the first solution;

[0032] (2) Accurately weigh 19.200g of NaOH and dissolve it in 10ml of distilled water, stir for 30min to obtain the second solution;

[0033] (3) Add the first solution dropwise to the second solution, and continue to stir for 30 minutes to obtain a suspension;

[0034] (4) Put the suspension into a 100ml PPL liner, put it into a stainless steel hydrothermal synthesis kettle, put the hydrothermal synthesis kettle into a 100°C oven and heat for 24h to obtain Zr-doped modified nano-CeO 2 Great;

[0035] (5) After the temperature of the hydrothermal kettle is naturally cooled, remove the supernatant, add deionized water to wash the precipitate twice, and centrifuge after ultrasonication for 20 minutes, then wash the precipitate with absolute ethanol, and centrifuge after ultrasonication for 20 minutes to...

Embodiment 2

[0040] (1) Weigh 0.0173g La(NO 3 ) 3 ·6H 2 O and 1.736g Ce(NO 3 ) 3 ·6H 2O was dissolved in 70ml of distilled water and stirred for 30min to obtain the first solution;

[0041] (2) Accurately weigh 19.200g of NaOH and dissolve it in 10ml of distilled water, stir for 30min to obtain the second solution;

[0042] (3) Add the first solution dropwise to the second solution, and continue to stir for 30 minutes to obtain a suspension;

[0043] (4) Put the suspension into a 100ml PPL liner, put it into a stainless steel hydrothermal synthesis kettle, put the hydrothermal synthesis kettle into a 100°C oven and heat for 24h to obtain Zr-doped modified nano-CeO 2 Great;

[0044] (5) After the temperature of the hydrothermal kettle is naturally cooled, remove the supernatant, add deionized water to wash the precipitate twice, and centrifuge after ultrasonication for 20 minutes, then wash the precipitate with absolute ethanol, and centrifuge after ultrasonication for 20 minutes to ...

Embodiment 3

[0049] (1) Weigh 1.736g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 70ml of distilled water and stirred for 30min to obtain the first solution;

[0050] (2) Accurately weigh 19.200g of NaOH and dissolve it in 10ml of distilled water, stir for 30min to obtain the second solution;

[0051] (3) Add the first solution dropwise to the second solution, and continue to stir for 30 minutes to obtain a suspension;

[0052] (4) Put the suspension into a 100ml PPL liner, put it into a stainless steel hydrothermal synthesis kettle, put the hydrothermal synthesis kettle into a 100°C oven and heat for 24h to obtain Zr-doped modified nano-CeO 2 Great;

[0053] (5) After the temperature of the hydrothermal kettle is naturally cooled, remove the supernatant, add deionized water to wash the precipitate twice, and centrifuge after ultrasonication for 20 minutes, then wash the precipitate with absolute ethanol, and centrifuge after ultrasonication for 20 minutes to obtain a white precipitate;

[00...

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Abstract

The invention discloses a modified CeO2 nanorod-doped catalyst and application thereof. The catalyst is composed of CeO2 nanorod and modified metallic element which is doped thereon by in-situ hydrothermal synthesis. The CeO2 nanorod is exposed to (110) and (100) crystal faces. The modified metallic element is Zr, La, Y or Sr. As different morphologies of nano-CeO2 are exposed to different crystal faces, different surface characteristics and catalytic characteristics will be shown. Reverse water gas shift reaction of CeO2 nanorod exposed to the (110) and (100) crystal faces is the best. With the rod-like nano-CeO2, catalytic action of the catalyst can be performed to the greatest extent.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a doped modified nano-CeO 2 Rod catalysts and their applications. Background technique [0002] Currently in CO 2 The reverse water gas shift reaction is one of the effective methods to generate carbon monoxide from carbon dioxide, and it is also considered to be one of the most promising reactions. In the practical application of the reverse water gas shift reaction, usually with CO 2 As a carbon source, more valuable CO is generated through the reverse water gas shift reaction, and then CO is used as an intermediate for the next step of synthesis. In the process of directly producing low-carbon olefins from synthesis gas, the reverse water gas shift reaction under high temperature conditions is the key step. [0003] At present, through the efforts of researchers, a variety of reverse water gas shift reaction catalysts have been developed, but there are defects such as po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J23/10C10K3/02
Inventor 刘勇军楚素雅李志峰
Owner HUAQIAO UNIVERSITY
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