Preparation method of tricobalt tetroxide monolithic catalyst for carbon monoxide purification

A monolithic catalyst, cobalt tetroxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low carbon monoxide purification efficiency, easy sintering and deactivation of precious metals, Catalyst waste and other issues, to achieve wide practicability, low cost, good water resistance

Active Publication Date: 2020-07-10
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hopcalite catalysts are extremely afraid of water, and need to be used with a large amount of desiccant; platinum and palladium noble metal monolithic catalysts have good water resistance, but the cost is high, and the operating temperature generally needs to be above 300°C, and noble metals are easy to sinter and deactivate
This type of catalyst has excellent catalytic activity and stability, but is expensive; non-precious metal carbon monoxide catalysts are mainly hopcalate catalysts, and a large number of hopcalate catalysts are generally used in mine refuge chambers and other confined spaces. Purify carbon monoxide gas by means of this method, which has extremely low purification efficiency for carbon monoxide and causes waste of catalyst

Method used

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  • Preparation method of tricobalt tetroxide monolithic catalyst for carbon monoxide purification
  • Preparation method of tricobalt tetroxide monolithic catalyst for carbon monoxide purification
  • Preparation method of tricobalt tetroxide monolithic catalyst for carbon monoxide purification

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preparation example Construction

[0027] The preparation method of the tricobalt tetroxide monolithic catalyst for carbon monoxide purification of the present invention adopts iron-chromium-nickel metal honeycomb as the catalyst carrier, and the specific surface area of ​​the iron-chromium-nickel metal honeycomb is 0.8-2m 2 / g, 400 mesh; the specific steps are as follows:

[0028] Step (1) Ultrasonic cleaning is performed on the iron-chromium-nickel metal honeycomb to remove impurities on the surface of the metal honeycomb, and then the ultrasonically cleaned metal honeycomb is placed in an oven to dry, and then treated by a combination of chemical erosion and heat treatment Dried metal honeycomb; the solution used in the ultrasonic cleaning is acetone, the ultrasonic frequency is 50 kHz, and the ultrasonic time is 3 h. The method of combining chemical attack and heat treatment is to immerse the dried metal honeycomb in 1mol / L sulfuric acid solution, heat it to 60°C for 30min, and then place the metal honeycom...

Embodiment 1

[0035] Example 1: Preparation of Cobalt Tetroxide Monolithic Catalyst for Carbon Monoxide Purification

[0036]Dissolve 4.98g of cobalt acetate in 60mL of ethylene glycol solution, heat to 160°C and maintain for one hour; slowly add 200ml of 0.2M sodium carbonate solution to the above solution, and age for 1h; filter the obtained solution, and repeat Cleaning with deionized water and ethanol solution; drying the filtered solid in an oven; then calcining in a muffle furnace, and the final black powdery substance is the nano-catalyst of cobalt trioxide. Grind 3g of cobalt tetroxide nanocatalyst into 150 mesh or more with a mortar, and dry the obtained powder at 50°C for 4h; then add 3g of cobalt tetroxide catalyst powder and 9g of silica sol into 100mL of deionized water, stir for 4h to obtain a suspension solution; put a 400-mesh metal honeycomb carrier with a height of 50mm and a diameter of 17mm in an acetone solution, ultrasonicate at 50kHz for 3h, and dry at 60°C for 2h; im...

Embodiment 2

[0038] Embodiment 2: Oxidation of carbon monoxide with tricobalt tetroxide monolithic catalyst for carbon monoxide purification

[0039] The catalytic activity of cobalt trioxide monolithic catalysts for carbon monoxide purification was evaluated by the efficiency of the digestion of carbon monoxide. Carbon monoxide oxidation is carried out in a fixed-bed catalytic reaction evaluation device. A 400-mesh monolithic catalyst with a height of 50mm and a diameter of 17mm is fixed in a quartz tube, and a mixed gas containing 0.5% carbon monoxide, 15% oxygen and 84.5% nitrogen is passed into the reactor. In the process, the gas velocity is adjusted to achieve different space velocities, and the gas purified by the tricobalt tetroxide monolithic catalyst is detected by a chromatograph for the concentration of carbon monoxide.

[0040] The evaluation results of the catalytic performance of the cobalt tetraoxide monolithic catalyst are attached Figure 4 shown. It can be seen from th...

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Abstract

The invention discloses preparation and application of a tricobalt tetraoxide monolithic catalyst used for purifying carbon monoxide. The catalyst is suitable for rapid digestion of the carbon monoxide in space. The preparation method comprises the following steps: a rod-shaped tricobalt tetraoxide nanocatalyst prepared by a hydrothermal method is used as an active component of oxidation of the carbon monoxide, a heat-treated and chemically-treated iron-chromium-nickel metal honeycomb is used as a carrier, and the catalyst coats the surface of the honeycomb ceramic by a repeated impregnation method. According to the method provided by the invention, a coating layer of the catalyst prepared by the method is uniformly supported on the surface of the carrier, is not easy to fall off, and hasless micro cracks; the metal honeycomb carrier has a high specific surface area and high thermal conductivity, and the prepared monolith catalyst can maintain high catalytic capacity and high stability in high-air-volume low-temperature high-moisture high-carbon-dioxide environments; and the monolithic catalyst has a simple and easy preparation process and a superior carbon monoxide purification effect, and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to the preparation and application of a catalyst, in particular to the preparation and application of a tricobalt tetroxide integral catalyst suitable for the purification of carbon monoxide in industries such as chemical industry and coal. Background technique [0002] The chemical industry, coal and other fuel combustion, and motor vehicle exhaust will emit a large amount of carbon monoxide gas. Carbon monoxide is a colorless, odorless, colorless, highly toxic gas that can easily combine with hemoglobin in human blood to form carboxyhemoglobin, leading to suffocation and death; Threat to the safety of escape personnel and rescue personnel. According to reports, 85% of the deaths were caused by the suffocation of carbon monoxide. Therefore, it is extremely important to efficiently purify carbon monoxide gas in a high-concentration carbon monoxide working environment and in a fire scene. [0003] At present, the main catalysts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86B01J35/04B01J35/10B01D53/86B01D53/62
CPCB01D53/864B01D2257/502B01J23/002B01J23/866B01J35/04B01J35/1009B01J2523/00B01J2523/67B01J2523/842B01J2523/847B01J2523/845Y02A50/20
Inventor 李佳周福宝陈小雨
Owner CHINA UNIV OF MINING & TECH
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