Catalyst for synergistically controlling nitrogen oxides and particulate matters in diesel engine tail gas as well as preparation method and application thereof

A nitrogen oxide, synergistic control technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor selectivity and high ignition temperature, and achieve High active loading, simple and controllable preparation, and good synergistic removal efficiency

Pending Publication Date: 2022-02-11
华设设计集团环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For PM oxidation, transition metal and perovskite catalysts often face the problems of high light-off temperature and poor selectivity.

Method used

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  • Catalyst for synergistically controlling nitrogen oxides and particulate matters in diesel engine tail gas as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a catalyst for synergistic control of nitrogen oxides and particulate matter in diesel engine exhaust, the specific preparation steps of which are as follows:

[0028] Step S1, use deionized water to wash and dry the honeycomb ceramics with a size of 100mm×100mm×50mm, then immerse them in alumina sol with a mass fraction of 20%, and let them stand for 30 minutes. Take out the alumina sol, use a high-pressure air gun to blow out the residual alumina sol in the pores of the honeycomb ceramics, dry the honeycomb ceramics in an oven at 100°C, transfer them to a muffle furnace, and bake them at 500°C for 4 hours to prepare Obtain catalyst carrier A;

[0029] Step S2, add the accurately weighed precursor salt of the metal active component, including: 316g of copper nitrate, 293g of manganese acetate and 262g of cerium nitrate, into 4L of deionized water, stir until it is uniformly dissolved, measure 4L of alumina sol, Add it into the solution and stir ...

Embodiment 2

[0035] Step S1, use deionized water to wash and dry the honeycomb ceramics with a size of 100mm×100mm×50mm, then immerse them in alumina sol with a mass fraction of 20%, and let them stand for 30 minutes. Take out the alumina sol, use a high-pressure air gun to blow out the residual alumina sol in the pores of the honeycomb ceramics, dry the honeycomb ceramics in an oven at 100°C, transfer them to a muffle furnace, and bake them at 500°C for 4 hours to prepare Obtain catalyst carrier A;

[0036] Step S2, add the precursor salt of the metal active component accurately weighed, including: 316g copper nitrate, 293g manganese acetate and 262g cerium nitrate, 15g palladium chloride, into 4L deionized water, stir until it dissolves evenly, measure 4L of alumina sol was added to the solution and stirred until uniform, and the active component sol B was prepared;

[0037]Step S3, immerse the catalyst carrier A obtained by roasting in step S1 in the active component sol B in the step ...

Embodiment 3

[0041] Step S1, use deionized water to wash and dry the honeycomb ceramics with a size of 100mm×100mm×50mm, then immerse them in a silica sol with a mass fraction of 30%, and let them stand for 30 minutes to remove the honeycomb ceramics from Take out the alumina sol, use a high-pressure air gun to blow out the residual alumina sol in the pores of the honeycomb ceramics, dry the honeycomb ceramics in an oven at 100°C, transfer them to a muffle furnace, and bake them at 500°C for 4 hours to prepare Obtain catalyst carrier A;

[0042] Step S2, add the precursor salt of the metal active component accurately weighed, including: 437g copper nitrate, 406g manganese acetate and 363g cerium nitrate, into 4L deionized water, stir until it dissolves evenly, measure 4L silica sol and 10 mL of nitric acid solution with a concentration of 2 mol / L was added to the solution and stirred until uniform to prepare the active component sol B;

[0043] Step S3, immerse the catalyst carrier A obta...

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PUM

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Abstract

The invention discloses a catalyst for synergistically controlling nitrogen oxides and particulate matters in diesel engine tail gas as well as a preparation method and application thereof. The preparation method comprises the following steps: immersing cleaned and dried honeycomb ceramic into coating sol, standing for 30 minutes, taking out the honeycomb ceramic and blowing away the residual coating sol in honeycomb ceramic holes, and performing drying, and roasting at high temperature by a muffle furnace to obtain a catalyst carrier A loaded with the coating sol; adding metal active component precursor salt into the coating sol and stirring to be uniform to prepare active component sol B, wherein the metal active component precursor salt comprises manganese acetate, cerous nitrate and copper nitrate; and finally, immersing the catalyst carrier A into the active component sol B, standing for 30 minutes, taking out the catalyst carrier A and blowing away the residual active component sol B in pores of the catalyst carrier A, and performing drying, and roasting at high temperature by a muffle furnace to obtain the catalyst. The removal efficiency of the catalyst prepared by the invention on nitrogen oxides in a temperature interval of 220-330 DEG C exceeds 80%, and the removal efficiency on particulate matters is nearly 30%.

Description

technical field [0001] The invention belongs to the technical field of preparation of catalytic materials in the process of environmental protection, and in particular relates to a catalyst for synergistic control of nitrogen oxides and particulate matter in diesel engine exhaust, a preparation method and application thereof. Background technique [0002] Due to low production and operation costs, strong horsepower, and CO 2 With the characteristics of low emission, high energy utilization rate and high power, it has been widely used in medium and large passenger trucks, power machinery, inland waterway transportation, and small power stations. Although diesel engines have many advantages, the exhaust emissions generated during the use of diesel engines also bring a heavy burden to the atmospheric environment. [0003] Compared with gasoline engine, the combustion mode of diesel engine is diffusion combustion, which has the characteristics of sufficient air and large excess...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/89F01N3/10F01N3/28
CPCB01J23/8892B01J23/8986F01N3/105F01N3/2803
Inventor 王霞曹亚丽殷承启侯克锁王玉红徐文文黎鹏
Owner 华设设计集团环境科技有限公司
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