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A kind of purification treatment method of diesel engine exhaust

A diesel engine and exhaust gas treatment technology, which is applied in the purification treatment of nitrogen monoxide and sulfur dioxide, and in the field of particulate matter in exhaust gas, can solve the problems of unsatisfactory effect, high price, and lack of resources, so as to improve the efficiency of catalytic reaction, low cost, and avoid The effect of catalyst poisoning

Active Publication Date: 2021-11-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the four-way catalysts doped with noble metals are expensive, resource-scarce, and unsatisfactory, catalysts doped with non-noble metal active components have become the focus of research.

Method used

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  • A kind of purification treatment method of diesel engine exhaust
  • A kind of purification treatment method of diesel engine exhaust
  • A kind of purification treatment method of diesel engine exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of zinc oxide porous honeycomb ceramic carrier:

[0049] Powder ratio: first use a ball mill to grind the sintering aid sodium silicate for 40 minutes, and then mix it with the four-needle nano-ZnOw powder material at a mass ratio of 1:25 to obtain the powder material;

[0050] Slime preparation: Weigh 35wt% water, 1.5wt% sodium polyacrylate, 2wt% glycerin and 4wt% gum arabic, and mix with the powder raw materials to prepare plastic mass mud;

[0051] Mud blank preparation: put the plastic micellar mud material prepared in step (2) into a vacuum mud refining machine for vacuum mud refining to obtain a mud blank matching the specifications of the molding machine barrel;

[0052] Extrusion molding: put the mud base obtained in step (3) into a vacuum extruder, and extrude a zinc oxide honeycomb ceramic green base with an inner diameter of 45 mm and an aperture of 1 mm through a die;

[0053] Drying and shaping: place the honeycomb ceramics prepared in step (4...

Embodiment 2

[0061] (1) Catalyst sol preparation: according to the molar ratio La:Ce:Ni=8:2:10, weigh 0.016mol lanthanum nitrate, 0.004mol cerium nitrate and 0.02mol nickel nitrate and dissolve them in 100ml water, then add 0.052mol citric acid Prepare a mixed solution, heat it in a water bath to 75°C and keep it warm for 3.5 hours to obtain a sol; (2) Carrier impregnation and drying: take 100ml of sol and impregnate 100g of zinc oxide honeycomb ceramic carrier for 15 minutes, then take out the impregnated carrier and put it in a microwave oven. Raise the temperature to 90°C and dry for 3 hours. After the drying is completed, repeat the above steps, impregnate and dry the carrier twice to obtain the pre-coated carrier; (3) Calcination: place the above-mentioned coated carrier in a microwave sintering furnace In the process, the temperature was raised to 600°C under the action of microwaves and calcined for 2 hours, and finally zinc oxide honeycomb ceramics loaded with lanthanum-cerium-nicke...

Embodiment 3

[0063] (1) Catalyst sol preparation: Weigh 0.014mol lanthanum nitrate, 0.006mol cerium nitrate and 0.02mol nickel nitrate respectively according to the molar ratio La:Ce:Ni=7:3:10 and dissolve them in 100ml water, then add 0.056mol citric acid Prepare a mixed solution, heat it in a water bath to 80°C and keep it warm for 3 hours to obtain a sol; (2) Carrier impregnation and drying: take 100ml of sol and impregnate 100g of zinc oxide honeycomb ceramic carrier for 18 minutes, then take out the impregnated carrier and put it in a microwave oven. Raise the temperature to 100°C and dry for 2.5 hours. After the drying is completed, repeat the above steps, impregnate and dry the carrier twice to obtain the pre-coated carrier; (3) Calcination: place the above-mentioned coated carrier in a microwave sintering furnace In the process, the temperature was raised to 700°C under the action of microwaves and calcined for 2 hours, and finally zinc oxide honeycomb ceramics loaded with lanthanum...

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Abstract

The invention relates to a method for purifying and treating exhaust gas of a diesel engine. Provide exhaust gas treatment catalysts, including zinc oxide honeycomb ceramic carrier and catalyst loaded on the carrier, wherein the zinc oxide honeycomb ceramic carrier is a microwave-absorbing and exothermic zinc oxide honeycomb ceramic material, which can trap and adsorb particulate matter in diesel engine exhaust, and in Under the action of microwave heating, the particles adsorbed on the ceramic surface are further burned and decomposed. At the same time, it can absorb sulfur dioxide in the exhaust gas of diesel engines, so as to achieve the purpose of desulfurization. In addition, the material supports a lanthanum-cerium-nickel composite metal oxide catalyst, which has a good denitrification effect on the exhaust gas of a diesel engine under a microwave field. The purification treatment method provided based on the above-mentioned carrier and catalyst can effectively improve the reaction efficiency of the catalyst, avoid catalyst poisoning and prolong its service life, and has broad application prospects in the field of purification of diesel engine exhaust.

Description

technical field [0001] The invention relates to the field of purification treatment of diesel engine tail gas, in particular to a purification treatment method for particulate matter, nitrogen monoxide and sulfur dioxide in the tail gas. Background technique [0002] Diesel engines have good fuel economy and are widely used in the automotive and marine industries. However, due to the low combustion temperature of the diesel engine, the exhaust gas contains many harmful substances, such as carbon monoxide (CO), nitrogen oxides (NO x ), hydrocarbons (CH), sulfur dioxide (SO 2 ) and particulate matter (PM), etc., will cause problems such as acid rain and smog in the atmospheric environment, seriously affecting people's health. [0003] At present, the commonly used exhaust after-treatment technologies for diesel engines mainly include diesel oxidation catalyst technology (DOC), diesel particulate filter (DPF), selective catalytic reduction technology (SCR) and four-way cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J35/04B01J37/08B01J37/02F01N3/022F01N3/028F01N3/035F01N3/08F01N3/20F01N3/28B01D53/94B01D53/56
CPCB01J23/83B01J23/002B01J37/088B01J37/0201F01N3/0222F01N3/028F01N3/035F01N3/0821F01N3/085F01N3/202F01N3/2828B01D53/9413F01N2250/02F01N2250/12F01N2250/14F01N2330/06F01N2570/14B01J2523/00B01D2258/012B01J35/40B01J35/56B01J2523/27B01J2523/3706B01J2523/3712B01J2523/847Y02A50/20
Inventor 王浩郭欢欢赵子健陶嘉逸
Owner WUHAN UNIV OF TECH
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