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Low-temperature combustion catalyst for eliminating diesel engine carbon black

A low-temperature combustion and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. problem, to achieve the effect of simple preparation method, easy industrialization and strong adaptability

Inactive Publication Date: 2010-07-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, precious metal resources are scarce, expensive, easy to poison and inactivate, difficult to restore, and pollute the environment
Perovskite oxides have been reported as soot combustion catalysts, but their activity cannot meet the actual requirements
Alkali metal oxides are often used as additives to improve catalyst performance due to their low melting point, but the high vapor pressure of alkali metals is easy to lose, which is not conducive to the stability of the catalyst

Method used

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  • Low-temperature combustion catalyst for eliminating diesel engine carbon black
  • Low-temperature combustion catalyst for eliminating diesel engine carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the molar ratio is that Ce, Fe nitrate of 5: 5 are formulated into the solution that total concentration is 0.2mol / L, then add appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 5mol / L ammonia water at a speed of 3ml / min to obtain a precipitate. Continue to stir for 30 min after the precipitation is complete. After aging for 60 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 65%), and kept at 200° C. for 48 hours. The obtained product is washed with water, washed with alcohol and dried to obtain a cerium-iron composite oxide catalyst. The light-off temperature (T i ) is 257℃, the peak temperature (T p ) is 324°C, and the average selectivity of carbon dioxide is 98.6%. After calcination at 600℃ and 800℃ for 10h, i and T p They are 293°C and 380°C respectively, and the average selectivity of carbon dioxide is 97.8%.

Embodiment 2

[0021] Example 2: The nitrates of Ce and Fe are respectively prepared into a salt solution with a concentration of 0.25mol / L, and then an appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 6M ammonia water at a speed of 5 ml / min to obtain a precipitate. Continue stirring for 60 min after the precipitation is complete. After aging for 60 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 65%), and kept at 220° C. for 48 hours. The resulting product was washed with water, washed with alcohol, and dried to obtain pure CeO 2 and Fe 2 o 3 powder. According to the molar ratio of Ce and Fe is 5:5, the CeO 2 and Fe 2 o 3 Mix evenly, and after high-speed ball milling for 30 minutes, a cerium-iron composite oxide catalyst is obtained. The light-off temperature (T i ) is 273℃, the peak temperature (T p ) is 323°C, and the average selectivity of carbon dioxide is 98.9%. After calcination at 800℃ for 20h, T i and...

Embodiment 3

[0022] Embodiment 3: the mol ratio is that Ce, Fe, Zr nitrate of 0.5: 0.35: 0.15 are mixed with the solution that total concentration is 0.25mol / L, then add appropriate amount of H 2 o 2 , mix evenly. The mixed solution was dropped into 5M ammonia water at a speed of 5 ml / min to obtain a precipitate. Continue stirring for 60 min after the precipitation is complete. After aging for 90 minutes, the resulting slurry was moved into a high-pressure reactor (filling degree: 60%), and kept at 220° C. for 48 hours. The obtained product is washed with water, washed with alcohol and dried to obtain a cerium-iron-zirconium composite oxide catalyst. The light-off temperature (T i ) is 257℃, the peak temperature (T p ) is 318°C, and the average selectivity of carbon dioxide is 99.8%. After calcination at 800℃ for 20h, the activity of the catalyst is still high, T i and T p They are 276°C and 373°C respectively, and the average selectivity of carbon dioxide is 99.1%.

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Abstract

The invention discloses a low-temperature combustion catalyst for eliminating diesel engine carbon black, the low-temperature combustion catalyst does not contain alkali metal and precious metal and is ferro-cerium-zirconium composite oxide; wherein the mole percentage composition of CeO2 is 50 percent, the mole percentage composition of Fe2O3 is 5-50 percent, and the mole percentage composition of ZrO2 is 45-0 percent; two preparation methods are included, the method I is coprecipitation hydrothermal synthesis method, the method II is mechanical mixing method; the method I comprises the following steps: Ce, Fe and Zr nitrates are prepared into saline solution with 0.1-0.5mol / L of total concentration according to stoichiometric ratio, and then H2O2 with proper amount is added, the mixture is fully stirred and mixed uniformly; under the strong stirring condition, the mixing solution is dropped in 3-8mol / L of ammonia water at 2-10mL / mim speed, so as to obtain precipitate; after the precipitating is completely carried out, the solution is continuously stirred for 30-120min. after aging is carried out for 30-180min, partial supernatant liquid is removed, the precipitate is transferred to a high pressure reactor (50-70 percent of filling degree) with 160-240 DEG C for 24-72 hours. The obtained product is washed respectively by deionized water and ethanol, and is dried 6-24h at 80-120 DEG C, so as to obtain the target catalyst. The material has high catalytic activity and heat stability, and has no pollution to environment.

Description

technical field [0001] The invention relates to a catalytic material for eliminating soot of diesel engines, which belongs to the field of environmental catalysis. Background technique [0002] Compared with gasoline vehicles, diesel vehicles have the advantages of good power, economy, durability and low carbon dioxide emissions, making them develop rapidly and be widely used in recent years. However, a large amount of soot contained in diesel engine exhaust is extremely harmful to the environment and human body, and is one of the main pollutants that cause environmental pollution and endanger human health. Therefore, in today's increasingly stringent environmental protection regulations, effective control of the emission of soot particles is a key issue that needs to be solved urgently in the development of diesel engines. Under the premise of not changing the existing engine system and fuel structure, the combination of filter and soot low-temperature combustion catalyst ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/94B01D53/62
Inventor 李孔斋晏冬霞王华魏永刚胡建杭祝星
Owner KUNMING UNIV OF SCI & TECH
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