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Perovskite type lanthanum-manganese-copper catalyst for CO catalytic oxidization and preparation method thereof

A perovskite-type, catalytic oxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor low-temperature catalytic oxidation of CO, etc., Achieve the effect of low cost, excellent medium and low temperature catalytic activity, and less preparation process

Inactive Publication Date: 2016-07-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature catalytic CO oxidation activity of perovskite-type catalysts is poor, and how to improve the catalytic efficiency has become a research hotspot of perovskite-type catalysts.

Method used

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  • Perovskite type lanthanum-manganese-copper catalyst for CO catalytic oxidization and preparation method thereof
  • Perovskite type lanthanum-manganese-copper catalyst for CO catalytic oxidization and preparation method thereof
  • Perovskite type lanthanum-manganese-copper catalyst for CO catalytic oxidization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 3.16g (0.01mol) lanthanum acetate, 2.45g (0.01mol) manganese acetate, and 1.80g (0.02mol) oxalic acid in a mortar and grind for 45 minutes to obtain a lanthanum-manganese composite oxalate precursor; Dry for 1h, then calcinate at 700℃ for 4h, take it out and grind for 15min to obtain catalyst LaMnO 3+δ .

[0034] figure 1 It is the infrared spectrum curve of the precursor of lanthanum manganese composite oxalate; figure 2 LaMnO 3+δ Infrared spectrum curve; image 3 LaMn 1-x Cu x O 3+δ (x=0, 0.1, 0.2, 0.3, 0.4) XRD pattern.

[0035] A fixed-bed reactor evaluation device was used to test the catalytic oxidation performance of the catalyst for CO. For each oxidation performance test, 500 mg of 40-60 mesh catalyst is used. The gas volume fraction for catalyst activity test: 5% CO, 5% O 2 , N 2 Equilibrate, the test temperature is 100~450℃. The performance test results show that the temperature at which the CO catalytic oxidation rate on the prepared catalyst reaches 95%...

Embodiment 2

[0037] Weigh 3.16g (0.01mol) lanthanum acetate, 2.21g (0.009mol) manganese acetate, 0.20g (0.001mol) copper acetate, and 2.70g (0.03mol) oxalic acid in a mortar and grind for 45 minutes to obtain a lanthanum manganese copper composite The oxalate precursor was dried at 80°C for 1 hour, then calcined at 800°C for 5 hours, taken out and ground for 25 minutes to obtain the catalyst LaMn 0.9 Cu 0.1 O 3+δ . The catalyst performance evaluation is the same as in Example 1. The performance test results show that the temperature at which the CO catalytic oxidation rate reaches 95% on the prepared catalyst is 184°C. Figure 5 LaMn 0.9 Cu 0.1 O 3+δ The CO-TPD map.

Embodiment 3

[0039] Weigh 1.63g (0.005mol) lanthanum oxide, 1.96g (0.008mol) manganese acetate, 0.40g (0.002mol) copper acetate, and 3.60g (0.004mol) oxalic acid in a mortar and grind for 45 minutes to obtain a lanthanum manganese copper composite The oxalate precursor was dried at 80°C for 1 hour, then calcined at 850°C for 3 hours, taken out and ground for 20 minutes to obtain the catalyst LaMn 0.8 Cu 0.2 O 3+δ . The catalyst performance evaluation is the same as in Example 1. The performance test results show that the temperature at which the catalytic oxidation rate of CO on the prepared catalyst reaches 95% is 158°C. Image 6 LaMn 0.8 Cu 0.2 O 3+δ The CO-TPD map.

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Abstract

The invention discloses a perovskite type lanthanum-manganese-copper catalyst for CO catalytic oxidization and a preparation method thereof. The catalyst has a molecular formula: LaMn1-xCuxO3+Delta, wherein 0< / =x< / =0.4, and is prepared by: mixing lanthanum source, manganese source and copper source comprising oxygen according to an atomic ratio in the catalyst molecular formula, adding an organic acid, and preparing by solid-phase precursor method. The catalyst uses perovskite composite oxide as an active component, transition metals are used in partial substitution, CO oxidation rate is up to higher than 95%, and the catalyst has good medium- and low-temperature catalytic activity, good selectivity and good high-temperature stability.

Description

Technical field [0001] The invention relates to the field of catalysts, in particular to a perovskite type lanthanum manganese copper catalyst for CO catalytic oxidation and a preparation method thereof. Background technique [0002] Air pollution is currently a prominent environmental problem, and carbon monoxide CO is one of the air pollutants with a wide impact. CO gas is colorless, odorless, flammable and explosive. After entering the human blood through the respiratory system, it will bind to hemoglobin, thereby preventing the combination of hemoglobin and oxygen, leading to hypoxia in the body tissues, and suffocation in severe cases. Therefore, CO gas purification has many applications in human life and industrial production, such as respiratory protection devices and tobacco harm reduction. The most effective way to purify CO is to use catalytic oxidation to convert it into environmentally harmless CO 2 . [0003] CO oxidation catalysts are mainly divided into two categor...

Claims

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Application Information

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IPC IPC(8): B01J23/889
CPCB01J23/002B01J23/8892B01J2523/00
Inventor 李大光田旭胡秋明占峰万柯
Owner GUANGDONG UNIV OF TECH
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