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A kind of non-precious metal oxide catalyst with anti-water protection layer and preparation method

A non-precious metal and catalyst technology, which is applied in the field of non-precious metal oxide catalysts and preparation, can solve the problems of limited application, high price, deactivation, etc., and achieve the effect of simple preparation method, low cost, and activity recovery

Inactive Publication Date: 2019-03-15
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the catalysts for catalytic oxidation of CO mainly include noble metals and non-noble metals. Noble metals have excellent activity in catalytic oxidation of CO, but their application is limited due to their high price, easy sulfur poisoning and high temperature sintering.
[0004] For non-noble metal catalysts such as Co 3 o 4 、CuO / CeO 2 , CuO-MnO 2 etc., where Co 3 o 4 It has attracted much attention due to its excellent catalytic performance for low-temperature CO oxidation reactions, but Co 3 o 4 Extremely sensitive to moisture, even trace amounts of water can cause rapid deactivation

Method used

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  • A kind of non-precious metal oxide catalyst with anti-water protection layer and preparation method
  • A kind of non-precious metal oxide catalyst with anti-water protection layer and preparation method
  • A kind of non-precious metal oxide catalyst with anti-water protection layer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 9.31g of cobalt nitrate, 2.23g of ferric nitrate and 4.00g of oxalic acid in an agate mortar and mix well; add 2mL of ethylene glycol to it, grind for 30min, transfer it into a beaker, and put it into the beaker after ultrasonic treatment for 1h overnight in a drying oven at 110° C.; then put it into a muffle furnace and bake at 250° C. for 3 hours to obtain a catalyst. figure 2 For the Fe prepared in Example 1 a co b o x Transmission electron microscope (TEM) photo of the @MC catalyst.

[0029] The catalytic performance of the catalysts for CO oxidation was tested in a fixed bed reactor system. 200mg of 40-60 mesh catalyst was loaded into the reactor, and the catalyst was pretreated in nitrogen at 200°C for 30min before testing; 2 , the rest is N 2 (Equilibrium gas) reaction gas, the space velocity is 15000mL / (g·h), the reaction temperature is controlled and the conversion rate of CO is measured after the reaction reaches stability. The moisture content is...

Embodiment 2

[0032] Using the catalyst prepared in Example 1, reduce the calcination temperature of the catalyst to 230° C., and the other preparation conditions of the catalyst and the evaluation method of the catalyst are the same as in Example 1.

[0033] Activity evaluation results show that using the prepared Fe 3 co 16 o x @MC Catalyst, under humid conditions (0.6vol.%H 2 O) The complete conversion temperature of CO is 60°C; and in humid conditions (0.6vol.%H 2 (0) and temperature of reaction is that the stability of catalyst is tested under 70 ℃, test result is as follows Figure 4 As shown, the activity of the catalyst did not change after 350 hours of operation. In order to evaluate the catalytic stability at different CO conversion rates, under humid conditions (0.6vol.%H 2 (0) and the stability of the test catalyst under different reaction temperatures, the test results are as follows Figure 5 as shown, Figure 5 Middle: a: catalyst activity measured at 40°C; b: catalyst...

Embodiment 3

[0035] Using the catalyst prepared in Example 1, increase the catalyst calcination temperature to 350° C., and the other preparation conditions of the catalyst and the evaluation method of the catalyst are the same as in Example 1.

[0036] Activity evaluation results show that using the prepared Fe 3 co 16 o x @MC catalyst, under normal conditions (3-10ppm H 2 O) The complete conversion temperature of CO is -96°C under humid conditions (0.6vol.%H 2 O) The complete conversion temperature of CO is 70 °C.

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Abstract

The invention discloses a non-noble metal oxide catalyst with a water-resistant protecting layer and a preparation method. A nanometer transition metal Fe / Co compound oxide is taken as an active component of the catalyst disclosed by the invention; a macromolecule porous film is attached to the surface of the catalyst, so that the catalyst has an excellent water resistance; a solid-phase method is adopted for preparing the catalyst; a compounding process is simple and easy to operate; the demand on the equipment is low; the catalyst cost is low; the catalyst disclosed by the invention has ultrahigh activity and stability in CO oxidizing reaction; and the catalyst also can be used for oxidizing and eliminating other harmful toxic gases, such as, formaldehyde and volatile organic contaminants (VOCs).

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a non-precious metal oxide catalyst with a water-resistant protective layer and a preparation method. Background technique [0002] As we all know, CO is a poisonous, colorless and odorless gas. Due to the rapid development of the chemical industry, fossil fuel combustion, and motor vehicles, a large amount of CO emissions has become a serious environmental problem and has attracted widespread attention. The low-temperature (<100°C) elimination of CO has important application value in many aspects, such as the elimination of CO in the air of road tunnels and underground parking lots, CO gas detector materials, CO 2 There are important application prospects in the purification of gas in lasers, tobacco harm reduction, breathing gas purification devices, and the elimination of trace CO in closed systems (such as aircraft, submarines, spacecraft, etc.). Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01D53/86B01D53/44B01D53/62
CPCB01D53/864B01D53/8668B01D2257/502B01D2257/708B01J23/75Y02A50/20
Inventor 卢冠忠沈亚莉黄厚金俞俊肖秀珍郭晓明毛东森
Owner SHANGHAI INST OF TECH