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Monolithic catalyst for catalytic oxidation of CO at normal temperature and preparation method thereof

A monolithic catalyst, catalytic oxidation technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Insufficient processing capacity, insufficient catalytic activity at room temperature, etc., to achieve good water resistance and sulfur resistance and stability, improve low temperature catalytic activity and stability, and high room temperature activity.

Active Publication Date: 2017-11-24
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, despite years of research, the performance of noble metal-based CO removal catalysts at room temperature has been greatly improved, but there are still the following shortcomings: 1) The catalytic activity at room temperature is insufficient and the stability is poor; 2) The catalyst is resistant to water, Poor sulfur resistance and short life; 3) Insufficient catalyst processing capacity at high space velocity; 4) It is still necessary to find a simpler catalyst preparation method to improve the utilization rate of precious metals and reduce costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a monolithic catalyst for catalytic oxidation of CO at normal temperature, using the following steps:

[0043] (1) Under the condition of 60°C, the cordierite honeycomb ceramic carrier was treated with 10% nitric acid solution with a mass concentration of 8h, then washed with water until neutral, and dried at 80°C for 8h;

[0044] (2) Cobalt nitrate, zinc nitrate, cerium nitrate and zirconium nitrate are dissolved in water to prepare a mixed salt solution with a total concentration of cobalt, zinc, cerium and zirconium metal ions of 0.05mol / L, wherein cobalt, zinc, cerium and zirconium The molar ratio of metal ions is 10:5:5:1;

[0045] Then at 20°C, add the above mixed metal salt solution and sodium carbonate solution with a concentration of 0.05mol / L into the reactor dropwise and stir for 0.5h, wherein the molar ratio of the mixed metal salt to the precipitant is 1:1 , adjust the pH of the co-precipitation slurry at 6.5; after the co-current dr...

Embodiment 2

[0052] A method for preparing a monolithic catalyst for catalytic oxidation of CO at normal temperature, using the following steps:

[0053] (1) Under the condition of 100°C, the cordierite honeycomb ceramic carrier was treated with a hydrochloric acid solution with a mass concentration of 30% for 2 hours, then washed with water until neutral, and dried at 120°C for 2 hours;

[0054] (2) Dissolve cobalt nitrate, zinc nitrate, cerium nitrate and manganese nitrate in water to prepare a mixed salt solution with a total concentration of cobalt, zinc, cerium and manganese metal ions of 3mol / L, wherein cobalt, zinc, cerium and manganese metal The molar ratio of ions is 15:1:1:1;

[0055] Then at 80°C, the mixed metal salt solution and the sodium bicarbonate solution with a concentration of 3 mol / L were added dropwise to the reactor and stirred for 4 hours, wherein the molar ratio of the mixed metal salt to the precipitant was 1:4, Adjust the pH of the co-precipitation slurry to 10;...

Embodiment 3

[0062] A method for preparing a monolithic catalyst for catalytic oxidation of CO at normal temperature, using the following steps:

[0063] (1) Under the condition of 80°C, the cordierite honeycomb ceramic carrier was treated with oxalic acid solution with a mass concentration of 20% for 4 hours, then washed with water until neutral, and dried at 100°C for 6 hours;

[0064] (2) Cobalt acetate, zinc nitrate, cerium nitrate and nickel nitrate are dissolved in water to prepare a mixed salt solution with a total concentration of cobalt, zinc, cerium and nickel metal ions of 0.5mol / L, wherein cobalt, zinc, cerium and nickel The molar ratio of metal ions is 15:1:1:1;

[0065] Then, at 80°C, the above-mentioned mixed metal salt solution and ammonia solution with a concentration of 0.5mol / L were added dropwise into the reactor and stirred for 2 hours, wherein the molar ratio of the mixed metal salt to the precipitant was 1:2, adjusted The pH of the co-precipitation slurry is 8; afte...

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Abstract

The present invention belongs to the technical field of environmental protection, and in particular relates to a monolithic catalyst for catalytic oxidation of CO at normal temperature and a preparation method thereof. The monolithic catalyst comprises precious metal Pt as an active component, a composite metal oxide as an auxiliary agent coating, and honeycomb ceramic as a carrier; the mass ratio of the precious metal Pt, the composite metal oxide coating and the honeycomb ceramic carrier is 0.01-2:5-20:80-90. The composite metal oxide coating is a mixture of a cobalt-based composite metal oxide, pseudoboehmite and gamma-Al2O3 in a mass ratio of 10-15: 1-5: 1-5. The catalyst prepared by the method has high activity at normal temperature, lowers the energy consumption of CO removal process, has good water and sulfur resistance and stability, can achieve CO effective removal under the conditions of high space velocity, CO concentration and air volume change, and is applicable to normal temperature elimination of CO in all types of combustion tail gases and closed and semi-enclosed places.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an integral catalyst for catalytic oxidation of CO at normal temperature and a preparation method thereof. Background technique [0002] Carbon monoxide (CO) is one of the main pollutants in the atmosphere, mainly from exhaust emissions from incomplete combustion of fossil fuels such as coal, oil, and natural gas, and from chemical production processes. CO in the environment can quickly combine with hemoglobin in human blood, reducing the oxygen transport capacity of hemoglobin, leading to human poisoning and even death. Therefore, it is of great significance to protect the environment and human health to study efficient and environmentally friendly CO exhaust gas removal technology to effectively reduce CO emissions. [0003] The CO catalytic oxidation method is to convert CO into non-toxic CO under the action of a catalyst. 2 , this method has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/03B01J37/08B01D53/86B01D53/62
CPCB01D53/864B01D2257/502B01J23/002B01J23/8953B01J23/8986B01J37/03B01J37/088B01J2523/00B01J2523/27B01J2523/3712B01J2523/72B01J2523/845B01J2523/847B01J2523/17B01J2523/48B01J2523/3706Y02A50/20
Inventor 张磊叶丽萍杨维成夏克顾慧劼李帅罗勇
Owner SHANGHAI RES INST OF CHEM IND
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