Catalyst for exhaust gas purification and preparation method thereof

A waste gas purification and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as high light-off temperature, low catalytic activity of precious metals, and lower light-off temperature, so as to improve Catalytic activity, improved catalytic activity, and easy operation

Active Publication Date: 2021-05-28
广州尖峰生物制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the composite oxides in the prior art show excellent catalytic activity, the light-off temperature is still relatively high when dealing with VOCs, and the overall catalytic activity is still lower than that of noble metals. Based on the above situation, it is urgent to develop a new catalyst that can significantly Lower light-off temperature and excellent catalytic activity

Method used

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  • Catalyst for exhaust gas purification and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A method for preparing a catalyst for exhaust gas purification, the method comprising the following steps:

[0029] (1) by CuFe 1.94 SM 0.03 Er 0.03 o 4 The stoichiometric ratio of 0.5mol copper nitrate, 0.47mol ferric nitrate, 0.015mol samarium nitrate and 0.015mol erbium nitrate were respectively dissolved in 50mL deionized water to form metal nitrate precursor solution A;

[0030] (2) Dissolve 1 mol of citric acid in 50 mL of deionized water to form citric acid precursor solution B;

[0031] (3) Slowly add solution B to solution A, adjust the pH to neutral with ammonia water, and continue to stir at 75°C until the solution is in a sol state; wherein, the stirring speed is 150rpm, and the stirring time is 6h;

[0032] (4) Add cerium oxide to the above sol, and continue to stir for 3 hours; then the sol is aged for 12 hours to form a gel, and then dried at 140°C for 15 hours to form a xerogel; put it in a muffle furnace at 300°C Calcined for 5 h, then calcined at ...

Embodiment 2

[0035] A method for preparing a catalyst for exhaust gas purification, the method comprising the following steps:

[0036] (1) by CuFe 1.94 SM 0.04 Er 0.02 o 4The stoichiometric ratio of 0.5mol copper nitrate, 0.47mol ferric nitrate, 0.02mol samarium nitrate and 0.01mol erbium nitrate were respectively dissolved in 50mL deionized water to form metal nitrate precursor solution A;

[0037] (2) Dissolve 1 mol of citric acid in 50 mL of deionized water to form citric acid precursor solution B;

[0038] (3) Slowly add solution B to solution A, adjust the pH to neutral with sodium hydroxide solution, and continue stirring at 80°C until the solution is in a sol state; the stirring speed is 200rpm, and the stirring time is 3h;

[0039] (4) Add cerium oxide to the above sol, and continue to stir for 4 hours; then the sol is aged for 10 hours to form a gel, and then dried at 160°C for 14 hours to form a xerogel; put it in a muffle furnace at 320°C Calcined for 4 hours, then calcine...

Embodiment 3

[0042] A method for preparing a catalyst for exhaust gas purification, the method comprising the following steps:

[0043] (1) by CuFe 1.94 SM 0.02 Er 0.04 o 4 The stoichiometric ratio of 0.5mol copper nitrate, 0.47mol ferric nitrate, 0.01mol samarium nitrate and 0.02mol erbium nitrate were respectively dissolved in deionized water to form metal nitrate precursor solution A;

[0044] (2) Dissolve 1 mol of citric acid in 50 mL of deionized water to form citric acid precursor solution B;

[0045] (3) Slowly add solution B to solution A, adjust the pH to neutral with sodium carbonate solution, and continue stirring at 70°C until the solution is in a sol state; the stirring speed is 100rpm, and the stirring time is 9h;

[0046] (4) Add cerium oxide to the above sol, and continue to stir for 2 hours; then the sol is aged for 14 hours to form a gel, and then dried at 120°C for 16 hours to form a xerogel; put it in a muffle furnace at 280°C Calcined for 6 hours, then calcined at...

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Abstract

The invention discloses a catalyst for exhaust gas purification and a preparation method thereof. The catalyst is CuFe co-doped with samarium (Sm) and erbium (Er) as active components 2 o 4 , denoted as CuFe (2‑x‑y) SM x Er y o 4 ; where x is 0.02-0.04; y is 0.02-0.04; the carrier is CeO 2 ; The CuFe (2‑x‑y) SM x Er y o 4 The mass ratio to cerium oxide is 1:4 to 1:9. The ionic radius and redox potential of the active components of the catalyst are improved by Sm and Er co-doping, thereby improving the catalytic activity of the catalyst, while cerium oxide not only acts as a carrier, but also cerium oxide itself has excellent oxygen storage capacity and oxidation-reduction potential. Reduction performance, which promotes each other with the active components. Due to the synergistic effect between the two, the catalytic activity of the catalyst is significantly improved, making it more excellent in the catalytic combustion performance of volatile organic compounds VOCs, and significantly reduced The light-off temperature is an ideal catalyst for treating VOCs.

Description

technical field [0001] The invention relates to the field of exhaust gas purification, in particular to a catalyst for exhaust gas purification and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOCs) are one of the important precursors that cause photochemical smog, smog and ozone, and VOCs mainly include benzene, toluene, ethylbenzene, etc. The VOCs treatment methods mainly include adsorption method, microbial method, photocatalysis method, low temperature plasma method, catalytic combustion method, etc. Among them, the catalytic combustion method has the advantages of high removal rate, low cost of auxiliary equipment, green and pollution-free, and high safety performance. , are widely used in production. [0003] Among them, composite metal catalysts are more widely used in the process of removing volatile organic compounds. prepared by Biemelt et al. 1.5 mn 1.5 o 4 The Hopcalite nanopowder as the main crystal phase has a hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J37/03B01J37/08F23G7/07B01D53/86B01D53/44C01F17/235
CPCB01D53/8687B01D2257/708B01J23/002B01J23/83B01J37/036B01J37/082B01J2523/00C01P2006/12C01P2006/14C01F17/235F23G7/07B01J2523/17B01J2523/3712B01J2523/3737B01J2523/3775B01J2523/842Y02A50/20
Inventor 冯家胜
Owner 广州尖峰生物制品有限公司
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