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Manganese oxide modified vanadium-based catalyst for denitrifying diesel vehicle tail gas as well as preparation method and application thereof

A manganese oxide and catalyst technology, which is applied in the field of manganese oxide modified vanadium-based catalyst and its preparation, can solve problems such as inability to meet national emission requirements, and achieve the effects of easy control, simple process and good repeatability.

Inactive Publication Date: 2018-11-16
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and deficiencies that the traditional vanadium-based catalysts in the prior art cannot meet the national emission requirements in the denitrification of automobile tail gas, and provide a manganese oxide-modified vanadium-based catalyst for denitrification of diesel vehicle tail gas. Preparation

Method used

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  • Manganese oxide modified vanadium-based catalyst for denitrifying diesel vehicle tail gas as well as preparation method and application thereof
  • Manganese oxide modified vanadium-based catalyst for denitrifying diesel vehicle tail gas as well as preparation method and application thereof
  • Manganese oxide modified vanadium-based catalyst for denitrifying diesel vehicle tail gas as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0044] This example provides a manganese oxide modified vanadium-based catalyst V for denitrification of diesel vehicle exhaust 2 o 5 -WO 3 -MnO x / TiO 2 -1, prepared by the following preparation method.

[0045] Preparation V 2 o 5 -WO 3 -MnO x / TiO 2 -1: (1) the carrier TiO 2 Baking in air atmosphere at 300~400°C for 3~5 hours to remove moisture and impurity gases in the catalyst pores. Take a certain amount of ammonium metavanadate and ammonium metatungstate, add oxalic acid solution with a concentration of 0.1~0.5 mol / L, and stir until they are completely dissolved. Using the equal volume impregnation method, the carrier TiO pretreated by step 2Add to the solution prepared in the above steps, stir for 0.5 hours, dry naturally, and then dry at 60-80°C for 8-12 hours. Calcining the dried powder in an air atmosphere at 400-600°C for 2-5 hours to obtain a vanadium-based catalyst. (2) Using the equal-volume impregnation method, add the obtained vanadium-based catal...

Embodiment 2

[0047] This example provides a manganese oxide modified vanadium-based catalyst V for denitrification of diesel vehicle exhaust 2 o 5 -WO 3 -MnO x / TiO 2 , prepared by the following preparation method.

[0048] The vanadium-based catalyst was prepared by step (1) in Example 1, and the obtained vanadium-based catalyst was added to the manganese (III) acetylacetonate solution dissolved in acetone by an equal-volume impregnation method, stirred for 10 minutes, and dried naturally. Dry at 60~80℃ for 8~12 hours. The dried powder was calcined in an air atmosphere at 550° C. for 4 hours to obtain a manganese oxide-modified vanadium-based catalyst. Among them, the active ingredient V 2 o 5 The mass percentage of the catalyst is 3%, and the auxiliary agent WO 3 The mass percentage of the catalyst is 10%, MnO x The mass percentage of the catalyst is 0.03%, and the carrier TiO 2 The mass percentage of the catalyst is about 86.97%.

Embodiment 3

[0050] This example provides a manganese oxide modified vanadium-based catalyst V for denitrification of diesel vehicle exhaust 2 o 5 -WO 3 -MnO x / TiO 2 , prepared by the following preparation method.

[0051] The vanadium-based catalyst was prepared by step (1) in Example 1, and the obtained vanadium-based catalyst was added to the manganese (III) acetylacetonate solution dissolved in acetone by an equal-volume impregnation method, stirred for 10 minutes, and dried naturally. Dry at 60~80℃ for 8~12 hours. The dried powder was calcined in an air atmosphere at 550° C. for 4 hours to obtain a manganese oxide-modified vanadium-based catalyst. Among them, the active ingredient V 2 o 5 The mass percentage of the catalyst is 3%, and the auxiliary agent WO 3 The mass percentage of the catalyst is 10%, MnO x The mass percentage of the catalyst is 0.08%, and the carrier TiO 2 The mass percentage of the catalyst is about 86.92%.

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Abstract

The invention relates to a manganese oxide modified vanadium-based catalyst for denitrifying diesel vehicle tail gas as well as a preparation method and application thereof. The preparation method comprises the following steps: S1: dissolving acetylacetone manganese (III) to obtain a manganese precursor solution; S2: adding a vanadium-based catalyst into the manganese precursor solution; after stirring and drying, roasting in an air atmosphere to obtain the manganese oxide modified vanadium-based catalyst. In the manganese oxide modified vanadium-based catalyst, the mass percent of manganese oxide is 0.03 to 0.08 percent. The preparation method provided by the invention has the advantages of convenience, easiness for controlling operation and good repeatability; the prepared manganese oxide modified vanadium based catalyst has higher denitrification activity and a temperature window is expanded by 40 DEG C; the NOx conversion rate reaches 90 percent or above in a range of 255 to 465 DEG C; the manganese oxide modified vanadium-based catalyst can be widely applied to denitrification treatment of the diesel vehicle tail gas.

Description

technical field [0001] The invention belongs to the field of preparation of catalytic materials, and in particular relates to a manganese oxide-modified vanadium-based catalyst used for denitrification of diesel vehicle exhaust, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of my country's transportation industry, the air pollution caused by motor vehicle exhaust has attracted great attention from the state. [0003] Compared with gasoline vehicles, diesel vehicles use optimized combustion technology to reduce the emissions of carbon monoxide (CO) and hydrocarbons (HCs) in the exhaust, but the emissions of nitrogen oxides (NOx) are much higher than gasoline vehicles. NOx can cause smog and photochemical smog, seriously endangering human health. Selective Catalytic Reduction (SCR) technology has been proven to be one of the most effective denitrification technologies for diesel vehicles. SCR denitrifi...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/02B01D53/94B01D53/56
CPCB01D53/9413B01D2258/012B01J23/002B01J23/34B01J37/0203B01J2523/00B01J2523/47B01J2523/55B01J2523/69B01J2523/72
Inventor 余林杨润农赵向云蓝邦杨晓波萧剑鸣范群孙明穆杨
Owner GUANGDONG UNIV OF TECH
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