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Perovskite-structure substance and preparation method and application thereof

A perovskite structure and material technology, applied in separation methods, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of poor selectivity and short service life, achieve high specific surface area, ensure sintering strength, The effect of improving uniformity

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, the heat preservation temperature is 130°C, and finally, the material obtained after heat preservation is pre-calcined in a muffle furnace, under 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, and ...

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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Abstract

The invention discloses a perovskite-structure substance and a preparation method and an application thereof, wherein the perovskite-structure substance is prepared by the following method: 1) adding a titanium salt to deionized water, to prepare a colloid with the weight percentage concentration of 5-35%, adding a pH regulator to adjust the pH value to 7-8, and washing the obtained colloid material with deionized water; 2) adding a molybdenum salt to deionized water, to prepare a colloid with the weight percentage concentration of 1-25%, adding a pH regulator to adjust the pH value to 7-8, and washing the obtained colloid material with deionized water; and 3) mixing the washed material with V2O5, carrying out heat preservation drying, and precalcining. The prepared perovskite-structure substance can be used for preparing an SCR catalyst for treating diesel engine exhaust gas NOx, avoids uneven V2O5 loading and improves the sulfur resistance performance and selectivity of the catalyst.

Description

technical field [0001] The invention relates to the field of diesel engine exhaust treatment, in particular to a perovskite structure material and its preparation method and application. 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, especial...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/30B01D53/94B01D53/56
CPCB01D53/9413B01J23/002B01J23/28B01J23/30B01J37/0219B01J2523/00B01J2523/47B01J2523/55B01J2523/68Y02C20/10Y02T10/12
Inventor 施雅琼
Owner 上海净球环保科技有限公司
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