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Method for preparing BaFeO3 perovskite catalyst with excellent sulfur resistance for storing nitrogen oxide

A nitrogen oxide and perovskite technology is applied in the field of preparation of nitrogen oxide storage BaFeO3 perovskite catalysts, which can solve the problems of poor sulfur resistance and decreased storage capacity, achieve good sulfur resistance, reduce preparation costs, The effect of storing high amounts of nitrogen oxides

Inactive Publication Date: 2010-07-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst has good storage and reduction performance, and its storage capacity is 340.1 μmol / g at 400°C; but its sulfur resistance is poor, and the storage capacity after sulfidation is only 50.9 μmol / g, and the storage capacity drops by 85.0%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Prepare Ba(NO 3 ) 2 and Fe(NO 3 ) 3 0.1mol / L solution, according to Ba:Fe molar ratio is that 1:1 ratio gets 100ml and mixes evenly respectively, adds the citric acid solution 40ml of 0.5mol / L dropwise after ultrasonic half an hour (molar ratio is Ba:Fe:CA= 1:1:2), the temperature was maintained at 80°C, and the pH of the solution was controlled to be 9.0 with ammonia solution throughout the process to prevent precipitation in the solution, and the electronic stirrer was used to continuously stir, evaporate, and form a viscous substance; After drying in an oven at 120°C for 13 hours, it was first calcined at 400°C for two hours to completely burn the organic matter, and then calcined in a tube furnace at a heating rate of 4°C / min to 750°C for 6 hours.

[0011] The specific surface area of ​​the prepared sample is 6.5m 2 / g. The NOx storage performance test was carried out on the samples, and the test was carried out in a quartz tubular fixed-bed reactor with an in...

Embodiment 2

[0014] Prepare Ba(NO 3 ) 2 and Fe(NO 3 ) 3 0.1mol / L solution, according to Ba:Fe molar ratio is that 1:1 ratio gets 100ml and mixes evenly respectively, adds the citric acid solution 40ml of 0.5mol / L dropwise after ultrasonic half an hour (molar ratio is Ba:Fe:CA= 1:1:2), the temperature was maintained at 80°C, and the pH of the solution was controlled to be 9.0 with ammonia solution throughout the process to prevent precipitation in the solution, and the electronic stirrer was used to continuously stir, evaporate, and form a viscous substance; After drying in an oven at 120°C for 13 hours, it was first calcined at 400°C for two hours to completely burn the organic matter, and then calcined in a tube furnace at a heating rate of 4°C / min to 850°C for 6 hours.

[0015] The specific surface area of ​​the prepared sample is 5.9m 2 / g. Take 500mg sample at 800ppm NO, 5% O 2 , N 2 For balance gas, the air velocity is 2.52×10 4 h -1 Under the condition of constant temperatu...

Embodiment 3

[0017] Prepare Ba(NO 3 ) 2 and Fe(NO 3 ) 3 0.1mol / L solution, take 100ml each according to the Ba:Fe molar ratio of 1:1 and mix evenly, add 40ml of 0.5mol / L citric acid solution dropwise after ultrasonic half an hour (the molar ratio n / n is Ba:Fe : CA=1: 1: 2), the temperature is maintained at 80°C, the pH of the solution is controlled by ammonia solution to be 9.0 in the whole process to prevent precipitation in the solution, and the electronic stirrer is used to continuously stir, evaporate, and form a viscous substance; After it was dried in an oven at 120°C for 13 hours, it was first calcined at 400°C for two hours to completely burn the organic matter, and then calcined in a tube furnace at a heating rate of 4°C / min to 950°C for 6 hours.

[0018] The specific surface area of ​​the prepared sample is 2.6m 2 / g. Take 500mg sample at 800ppm NO, 5% O 2 , N 2 For balance gas, the air velocity is 2.52×10 4 h -1 Under the condition of constant temperature adsorption of...

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Abstract

The invention relates to a method for preparing a BaFeO3 perovskite catalyst with excellent sulfur resistance for storing nitrogen oxide, and belongs to a catalyst technique for removing NOx in exhaust gas produced by the combustion of automobile fuel. The method comprises the following steps: mixing nitrates of Ba and Fe; using citric acid and EDTA as complex agents; adjusting pH to between 8.0 and 10.0 to obtain a sol; drying and baking the sol to obtain a perovskite sample; and grinding and screening the perovskite sample to obtain the catalyst. The method has the advantages that: a preparation process is simple; a complete perovskite structure can be obtained by accurately controlling a pH value in a sample preparation process; and the perovskite catalyst has excellent sulfur resistance and regeneration performance, and is a non-noble metal NOx storing reducing catalyst with a good development prospect.

Description

technical field [0001] The invention relates to a nitrogen oxide storage BaFeO with good sulfur resistance 3 The invention discloses a preparation method of a perovskite catalyst, which belongs to the catalyst technology for removing NOx in the exhaust gas of automobile fuel combustion. Background technique [0002] 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. The Ba-Fe-O catalyst reported by Li Xingang et al. in 2004 was prepared by a sol-gel method using citric acid as a complexing agent, wherein the ratio of Ba:Fe:citric acid was 1:2:1. The catalyst has good storage and reduction performance, and its storage capacity is 340.1 μmol / g at 400°C; however, its sulfur resistance is poor, and the storage capacity after sulfidation is only 50.9 μmol / g, a decrease of 85.0%. Improving the anti-s...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01D53/94B01D53/56
Inventor 李新刚张兴文孟明贤晖
Owner TIANJIN UNIV