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Titanium tungsten powder and preparation method thereof

A technology of titanium tungsten powder and ammonium metatungstate, applied in the direction of separation methods, chemical instruments and methods, mechanical equipment, etc., can solve the problems of short service life and weak selectivity, achieve long service life, increase selectivity, The effect of prolonging the sulfur resistance performance

Inactive Publication Date: 2015-03-18
SHANGHAI LANGT AUTOCATALYST
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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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preparation example Construction

[0077] 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:

[0078] (1) Preparation of coating colloid

[0079] 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;

[0080] 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;

[0081] (2) Slurry Aging

[0082] 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;

[0083] (3) Carrier sizing:

[0084] The ultrasonically cleaned ceramic honeycomb is placed in the aged coating colloid for soaking, loading and sizing, and the ...

Embodiment 1

[0088] The synthesis and preparation of vanadium-containing perovskite-type structure materials include the following sequential steps:

[0089] 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.

[0090] The synthesis and preparation of titanium tungsten powder include the following sequential steps:

[0091] Ammonium metatungstate with a concentration of 7% by weight is modified to titanium dioxide powder with anatase s...

Embodiment 2

[0106] The synthesis and preparation of vanadium-containing perovskite-type structure materials include the following sequential steps:

[0107] 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.

[0108] The synthesis and preparation of titanium tungsten powder include the following sequential steps:

[0109] Ammonium metatungstate with a weight ratio of 8% is used to modify titanium dioxide powder with an...

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Abstract

The present invention provides titanium tungsten powder and a preparation method thereof, wherein titanium dioxide powder with an anatase structure is modified with ammonium metatungstate to obtain the titanium tungsten powder. The titanium tungsten powder of the present invention can be used for preparation of the SCR catalyst for treating diesel engine waste gas NOx, wherein the anti-sulfur performance and the service life of the catalyst can be improved.

Description

technical field [0001] The invention relates to the field of diesel engine tail gas treatment, in particular to a titanium-tungsten powder and a 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 increasingly strict, especially nitrogen ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCY02T10/12
Inventor 张现龙姜瑞霞焦雪静张蓓周坚刚
Owner SHANGHAI LANGT AUTOCATALYST
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