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Sulfur-resistant BaFe1-xTixO3 perovskite catalyst, preparation and application

A technology of bafe1-xtixo3 and catalyst, applied in the field of BaFe1-xTixO3 perovskite catalyst, can solve the problem of expensive use of precious metal Pt, and achieve the effects of simple preparation process, reduced preparation cost and good sulfur resistance

Inactive Publication Date: 2011-08-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used Pt / Ba-Al-O catalyst, due to the use of noble metal Pt is more expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 12.2 g of EDTA and add it to 300 ml of deionized water, sonicate for 5-8 minutes, then add ammonia water to dissolve it to form EDTA ammonia solution A. Weigh 5.4g Ba(NO 3 ) 2 Add solution A to ultrasonic for 5-8min, then add 7.6g Fe(NO 3 ) 3 9H 2 O After ultrasonication for 5-8 minutes, 13.1 g of citric acid was added, and then the pH value of the solution was adjusted to 6 with ammonia water to form a uniform solution B. The solution B was stirred and evaporated to dryness in a water bath at 70-90°C to a grass-green gel state, and dried in an oven at 120°C. The dried sample is heated up to 300°C at 4-6°C / min and roasted for 2-4 hours to decompose EDTA and citric acid and then grind it into powder C. Weigh 0.708g of butyl titanate and dissolve it in 30ml of absolute ethanol, then immerse powder C in it, and evaporate the absolute ethanol to dryness with a rotary evaporator after 24 hours to obtain powder D. Heat powder D at 4-6°C / min to 750°C for 6 hours, t...

Embodiment 2

[0017] Prepare BaFe with embodiment 1 method 0.8 Ti 0.2 o 3 Sample, where x is 0.2, the amount of each raw material used is respectively: 5.5g Ba(NO 3 ) 2 , 6.8g Fe(NO 3 ) 3 9H 2 O, 12.2g EDTA, 13.2g CA, 1.4g butyl titanate. The prepared sample has a specific surface area of ​​8.7m 2 / g. NO x Storage performance test, the method is: the gas volume composition is 800ppm NO, 5% O 2 , N 2 As balance gas, air speed is 8×10 5 h -1 Under the condition of 500mg sample isothermally adsorbed NO at 400℃ x . Continuous monitoring of NO in exhaust gas x concentration as a function of reaction time. Adsorb NO x The concentration was detected by Model 42i-HL nitrogen oxide analyzer (Thermo Scientific, chemiluminescence detector). The test result is: NO x The storage capacity is 1000 μmol / g, and the conversion rate of NO is 21.3%.

[0018] Test the anti-sulfur performance of the sample, the method is: the gas flow rate is 100ml / min, the space velocity is 2×10 5 h -1 , w...

Embodiment 3

[0020] Prepare BaFe with embodiment 1 method 0.7 Ti 0.3 o 3 Sample, where x is 0.3, and the quality of each raw material used is respectively: 5.5g Ba(NO 3 ) 2 , 5.9g Fe(NO 3 ) 3 9H 2 O, 12.2g EDTA, 13.2g CA, 2.1g butyl titanate. The specific surface area of ​​the prepared sample is 5.6m 2 / g. NO x Storage performance test, the method is: the gas volume composition is 800ppmNO, 5%O 2 , N 2 As balance gas, air speed is 8×10 5 h -1 Under the condition of 500mg sample isothermally adsorbed NO at 400℃ x . Continuous monitoring of NO in exhaust gas x The concentration of the adsorbed NO varies with the reaction time x The concentration was detected by Model 42i-HL nitrogen oxide analyzer (Thermo Scientific, chemiluminescence detector). The test result is: NO x The storage capacity is 1555 μmol / g, and the conversion rate of NO is 21.4%.

[0021] Test the anti-sulfur performance of the sample, the method is: the gas flow rate is 100ml / min, the space velocity is 2×1...

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Abstract

The invention discloses a sulfur-resistant BaFe1-xTixO3 perovskite catalyst, preparation and application, preparation and application, and belongs to a NOx eliminating catalyst technology. The structural formula of the catalyst is BaFe1-xTixO3, wherein X is 0.1-0.3; a preparation method of the catalyst comprises the following steps of: after mixing nitrates of Ba and Fe, using citric acid and EDTA (ethylene diamine tetraacetic acid) as complexing agents to regulate the pH (potential of hydrogen) to be 6, drying the sol after the mixture forms the sol, and dipping the sol in Ti after roasting the gel at a low temperature; roasting the gel at a high temperature to prepare a perovskite sample; performing NOx storage on the sample; and testing the sulfur-resistance and regeneration performance of the sample. The catalyst has the following advantage: a NOx storage catalyst with high sulfur-resistance is prepared through a dipping method. The perovskite catalyst has an excellent sulfur-resistant characteristic and regeneration performance, and is a non-noble metal NOx storage reduction catalyst which has a good development prospect.

Description

technical field [0001] The invention relates to a sulfur-resistant BaFe 1-x Ti x o 3 Perovskite catalyst and its preparation and application, belonging to BaFe 1-x Ti x o 3 Perovskite catalyst technology. Background technique [0002] In recent years, it has been used to purify automobile exhaust pollutants nitrogen oxides (NO x ) catalyst research is very active. With the increasingly stringent environmental emission regulations, in order to improve fuel economy and reduce CO 2 emissions, lean burn technology has been extensively developed. NO x Storage reduction (NSR) technology has been practically used in lean-burn engine vehicles with low-sulfur content fuels. Commonly used Pt / Ba-Al-O catalysts are expensive due to the use of noble metal Pt. BaTiO 3 Perovskite has good electrical conductivity and is a good electrode material, while BaFeO 3-x Perovskite is a key component of catalyst storage and sulfur resistance performance, and Ti doping is beneficial to B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01D53/94B01D53/56
Inventor 李新刚李凌云孟明贤晖李锋丽邱敏
Owner TIANJIN UNIV
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