Catalyst-containing urea for automobiles and preparation method of urea

A technology of urea and catalyst for vehicles, which is applied in the directions of heterogeneous catalyst chemical elements, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low conversion efficiency and poor urea dispersibility.

Inactive Publication Date: 2018-09-07
长沙小新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vehicle urea solution has a lower freezing point than ordinary vehicle urea, but has poor urea dispersibility, NO X The problem of low conversion efficiency

Method used

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  • Catalyst-containing urea for automobiles and preparation method of urea
  • Catalyst-containing urea for automobiles and preparation method of urea

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preparation example Construction

[0027] The preparation method of the described catalyzer-containing urea for vehicles comprises the following steps:

[0028] S1: Take ammonium metavanadate by weight ratio and add deionized water to make a solution, then add nano-WO 3 / MoO 3 -TiO 2 Stir at 60-80°C for 2-3h, put it in an electric furnace and bake at a high temperature of 500-550°C for 0.5-1.5h, then cool naturally to room temperature, put it in an electric furnace again and bake at a high temperature of 550-600°C for 1-1.5 hours h, naturally cool to room temperature to obtain catalyst; the consumption ratio of described ammonium metavanadate and deionized water is 1:20-40;

[0029] S2: Add urea to high-purity water at 25-30°C, stir to dissolve it fully, filter to make a solution with a concentration of 32% and less than 1% insoluble matter, and then add ethanolamine, ethanol, and ethylene glycol in sequence Alcohol, ammonium bicarbonate and secondary alcohol polyoxyethylene ether are fully stirred, and filt...

Embodiment 1

[0032] A catalyst-containing urea for vehicles, comprising the following raw materials: 32 parts of urea, 60 parts of high-purity water, 8 parts of ethanolamine, 8 parts of ethanol, 5 parts of ethylene glycol, 4 parts of ammonium bicarbonate, 2.8 parts of secondary alcohol polyoxyethylene ether, 3.2 parts of ammonium metavanadate, nano WO 3 / MoO 3 -TiO 2 2.3 servings.

[0033] The preparation method of the described catalyzer-containing urea for vehicles comprises the following steps:

[0034] S1: Take ammonium metavanadate by weight ratio and add deionized water to make a solution, then add nano-WO 3 / MoO 3 -TiO 2 Stir at 70°C for 3h, put it into an electric furnace and roast at a high temperature of 500°C for 0.5h, then naturally cool to room temperature, put it into an electric furnace again and roast at a high temperature of 580°C for 1.2h, and naturally cool to room temperature to obtain a catalyst; The dosage ratio of ammonium vanadate to deionized water is 1:20; ...

Embodiment 2

[0038] A catalyst-containing urea for vehicles, comprising the following raw materials: 36 parts of urea, 68 parts of high-purity water, 10 parts of ethanolamine, 2 parts of ethanol, 6 parts of ethylene glycol, 8 parts of ammonium bicarbonate, 3.1 parts of secondary alcohol polyoxyethylene ether, 1.5 parts of ammonium metavanadate, nano WO 3 / MoO 3 -TiO 2 2.6 servings.

[0039] The preparation method of the described catalyzer-containing urea for vehicles comprises the following steps:

[0040] S1: Take ammonium metavanadate by weight ratio and add deionized water to make a solution, then add nano-WO 3 / MoO 3 -TiO 2 Stir at 80°C for 2h, put it into an electric furnace and roast at a high temperature of 530°C for 1.2h, then cool naturally to room temperature, put it into an electric furnace again and roast at a high temperature of 600°C for 1.5h, and naturally cool to room temperature to obtain a catalyst; The dosage ratio of ammonium vanadate to deionized water is 1:30; ...

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Abstract

The invention discloses catalyst-containing urea for automobiles and a preparation method of the urea and belongs to the technical field of automobile exhaust treatment. The catalyst-containing urea for automobiles is prepared from raw materials as follows: urea, high-purity water, ethanolamine, ethanol, ethylene glycol, ammonium bicarbonate, secondary alcohol ethoxylate, ammonium metavanadate, nano WO3 / MoO3-TiO2 through preparation of a catalyst, preparation of a urea solution, mixing, stirring and other steps. A reinforcing system formed by secondary alcohol ethoxylate, ammonium metavanadateand nano WO3 / MoO3-TiO2 is applied to the urea for the automobiles, and the NOx conversion rate is increased.

Description

technical field [0001] The invention belongs to the technical field of automobile tail gas treatment, and in particular relates to catalyst-containing urea for automobiles and a preparation method thereof. Background technique [0002] SCR technology is to reduce the generation of particulate matter (PM) by strengthening the internal combustion of the engine, and then use urea solution to reduce NO X Catalytic reduction on the SCR catalyst. The SCR selective catalytic reduction system includes three parts: urea solution supply system, urea solution injection and control system, and SCR selective catalytic reduction system. The urea solution is stored in a special storage tank on the vehicle, and the urea solution is sprayed to the hot engine exhaust with a pump (about 300-500°C, meeting the reduction reaction conditions). At high temperature, the urea solution gasifies and decomposes to produce NH 3 , under the action of catalyst, NH 3 with NO in the exhaust X reaction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56B01J23/30
CPCB01D53/9418B01D2251/2067B01D2255/20707B01D2255/20723B01D2255/20769B01D2255/20776B01D2257/404B01D2258/01B01J23/002B01J23/30B01J2523/00B01J2531/46B01J2531/56B01J2531/64B01J2531/66
Inventor 不公告发明人
Owner 长沙小新新能源科技有限公司
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