SCR catalyst for treating diesel tail gas NOx and preparation method of SCR catalyst

A technology of SCR catalyst and diesel engine, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and chemical elements of heterogeneous catalysts. High surface area, effect of increasing selectivity

Inactive Publication Date: 2016-11-16
上海净球环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of traditional catalysts, it is found that the selectivity of the reaction is not strong, and the service life is short.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Preparation of perovskite structure materials

[0055] a) adding titanium tetrachloride to deionized water to form a colloid with a concentration of 20% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0056] b) adding molybdenum oxalate to deionized water to form a colloid with a concentration of 25% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0057] c) Combine the above washed material with V 2 o 5 Mixing, the ratio of the amount of titanium, molybdenum and vanadium is 1:0.5:1, heat preservation and drying for 25 hours, and the heat preservation temperature is 130°C. Finally, the material obtained after heat preservation is pre-calcined in a muffle furnace, and the air atmosphere , the temperature was raised to 400°C at a heating rate of 10°C / min, the temperature was kept constant for 4 hours, an...

Embodiment 2

[0070] (1) Preparation of perovskite structure materials

[0071] a) adding titanium tetrachloride to deionized water to form a colloid with a concentration of 30% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0072] b) adding molybdenum oxalate to deionized water to form a colloid with a concentration of 25% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0073] c) Combine the above washed material with V 2 o 5 Mixing, the ratio of the amount of titanium, molybdenum and vanadium is 1.5:0.8:1.5, heat preservation and drying for 25 hours, and the heat preservation temperature is 140°C. Finally, the material obtained after heat preservation is pre-calcined in a muffle furnace, and the heat preservation is carried out under air atmosphere. , the temperature was raised to 450°C at a heating rate of 15°C / min, the t...

Embodiment 3

[0086] (1) Preparation of perovskite structure materials

[0087] a) adding titanium tetrachloride to deionized water to form a colloid with a concentration of 35% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0088] b) adding molybdenum oxalate to deionized water to form a colloid with a concentration of 25% by weight, adding ammonia water to adjust the pH value to 7-8, and washing the obtained colloidal material with deionized water;

[0089] c) Combine the above washed material with V 2 o 5 Mixing, the ratio of the amount of titanium, molybdenum and vanadium is 2.5:1:2.5, heat preservation and drying for 25 hours, the heat preservation temperature is 150 ℃, and finally, the material obtained after heat preservation is pre-calcined in a muffle furnace, under the air atmosphere , the temperature was raised to 450°C at a heating rate of 15°C / min, the temperature was kept constant for 4 hours...

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PUM

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Abstract

The invention discloses an SCR catalyst prepared for treating diesel tail gas NOx and a preparation method of the SCR catalyst. The method for preparing the SCR catalyst comprises the following steps of: (1) mixing perovskite structure substances with titanium-tungsten powder and aluminum glue, adding polyvinyl alcohol and deionized water, performing stirring, and preparing coating colloid under the condition of high-speed shearing and emulsifying; (2) adding ammonium humate to the coating colloid for ageing, wherein the addition quantity of the ammonium humate is 0.05-2% of the weight of colloid materials; (3) placing honeycomb ceramics after ultrasonic cleaning is completed into the aged coating colloid, and performing impregnation, loading and sizing; and (4) performing drying and calcination on the sized ceramic honeycomb carriers so as to obtain the SCR catalyst. The catalyst prepared through drying and calcination is treated, then the treated catalyst is applied to an 8L common-rail diesel rack for purification experiments, and the experiments indicate that when gas reaction temperature is 180-420 DEG C, the conversion efficiency of nitrogen oxide is still maintained to be 97%, and after products are quickly aged through the rack, the conversion efficiency of the nitrogen oxide is still maintained to be 89% when the gas reaction temperature is 180-420 DEG C.

Description

technical field [0001] The invention relates to the field of diesel engine tail gas treatment, in particular to a method for treating diesel engine tail gas NO X SCR catalyst and preparation method thereof. Background technique [0002] In the past 20 years, in the face of the pressure brought by the depletion of the world's oil resources to social development and the impact of the rapid increase in car ownership on the environment, the world's automobiles have been constantly looking for solutions to achieve sustainable development of the automobile industry. In the development of advanced technology, people have a newer and deeper understanding of diesel engines and diesel vehicles. Compared with gasoline engines, diesel engines are economical and powerful, but they have brought certain negative effects on environmental pollution. With the deterioration of environmental quality, the limit value of exhaust pollution from mobile sources such as vehicles is becoming increasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCB01J23/30B01D53/9413B01D2255/40B01D2258/01B01J23/002B01J2523/00B01J2523/31B01J2523/47B01J2523/55B01J2523/68B01J2523/69
Inventor 施雅琼
Owner 上海净球环保科技有限公司
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