SCR catalyst used for processing diesel-engine tail gas NOx and preparation method thereof

A technology of SCR catalyst and diesel engine, which is applied in the field of diesel engine exhaust gas treatment, can solve the problems of short service life and weak selectivity, and achieve the effects of long service life, increased selectivity and prolonging sulfur resistance performance

Inactive Publication Date: 2015-03-18
SHANGHAI LANGT AUTOCATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of traditional catalysts, it is found that the s

Method used

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  • SCR catalyst used for processing diesel-engine tail gas NOx and preparation method thereof
  • SCR catalyst used for processing diesel-engine tail gas NOx and preparation method thereof

Examples

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Example Embodiment

[0064] The invention also provides a method for treating diesel engine exhaust NO X The preparation method of SCR catalyst is characterized in that method comprises the steps:

[0065] (1) Preparation of coating colloid

[0066] Mix the perovskite structure material, titanium tungsten powder and aluminum glue, add polyvinyl alcohol and deionized water for stirring, and prepare coating colloid under high-speed shear emulsification conditions;

[0067] The weight ratio of the perovskite structure substance, titanium-tungsten powder, aluminum glue, polyvinyl alcohol, and deionized water is 10-30:60-80:1-5:0.1-2:100-150;

[0068] (2) Slurry Aging

[0069] Add the above-mentioned coating colloid to potassium humate for aging, and the amount of potassium humate added is 0.1 to 1.5% of the weight of the coating colloid;

[0070] (3) Carrier sizing:

[0071] The ultrasonically cleaned ceramic honeycomb is placed in the aged coating colloid for soaking, loading and sizing, and the ...

Example Embodiment

[0088] Example 1:

[0089] The synthesis and preparation of vanadium-containing perovskite-type structure materials include the following sequential steps:

[0090] Titanium tetrachloride is used as a precursor to synthesize vanadium-containing perovskite structure substances, and titanium tetrachloride with a concentration of 20% by weight is added dropwise to deionized water, ammonia water is added to adjust the pH value to 8, and the obtained colloidal material The chloride ions were washed with deionized water, and the above washed material was mixed with V 2 o 5 Mixing, wherein the ratio of the amount of vanadium and titanium is 1:1, the grinding temperature is 450° C., and the grinding time is 12 hours. After grinding, a perovskite structure material is obtained.

[0091] The synthesis and preparation of titanium tungsten powder include the following sequential steps:

[0092] Ammonium metatungstate with a concentration of 7% by weight is modified to titanium dioxide ...

Example Embodiment

[0106] Example 2:

[0107] The synthesis and preparation of vanadium-containing perovskite-type structure materials include the following sequential steps:

[0108] Titanium tetrachloride is used as a precursor to synthesize vanadium-containing perovskite structure substances, and titanium tetrachloride is added dropwise to deionized water to form a colloid with a concentration of 25% by weight, and ammonia water is added to adjust the pH value to 8. Gained colloidal material washes chloride ion with deionized water, and the above-mentioned washed material is mixed with V 2 o 5 Mixing, wherein the ratio of the amount of vanadium and titanium is 1:1.2, the grinding temperature is 460° C., and the grinding time is 14 hours. After grinding, the perovskite structure material is obtained.

[0109] The synthesis and preparation of titanium tungsten powder include the following sequential steps:

[0110] Ammonium metatungstate with a weight ratio of 8% is used to modify titanium d...

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Abstract

The invention discloses a SCR catalyst used for processing diesel-engine tail gas NOx and a preparation method thereof. The SCR catalyst is prepared according to the following method: (1) preparing a coating colloid; (2) ageing the slurry; (3) sizing a carrier; and (4) drying and roasting. The active compositions of the SCR catalyst are dispersed in respective matrix materials, the catalytic reaction selectivity and the sulfur-resistant performance of the catalyst are enhanced, the service life of the catalyst is prolonged, and the SCR catalyst has the advantages of wide adaptable condition scope, long service life and the like.

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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IPC IPC(8): B01J23/30
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT AUTOCATALYST
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