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Metal honeycomb catalyst for purifying diesel motor exhaust gas and preparation method thereof

A diesel engine, metal honeycomb technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Problems such as poor thermal conductivity of bluestone, to achieve the effect of widening the working temperature range, improving catalytic activity, and small air resistance

Active Publication Date: 2009-07-08
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, this kind of catalyst uses honeycomb cordierite or metal material as the carrier, and then supports one or more oxides such as V, Ti, W, etc., but the air flow of honeycomb cordierite or metal material carrier is mainly direct current At the same time, due to the poor thermal conductivity of honeycomb cordierite, it is difficult for the catalyst to exert its catalytic performance better at high space velocity and low temperature.
This will lead to more use of increasing the volume of the catalyst to solve the problem of low temperature and high space velocity activity of the catalyst, which will bring more cost pressure to the enterprise

Method used

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  • Metal honeycomb catalyst for purifying diesel motor exhaust gas and preparation method thereof
  • Metal honeycomb catalyst for purifying diesel motor exhaust gas and preparation method thereof
  • Metal honeycomb catalyst for purifying diesel motor exhaust gas and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Preparation of metal honeycomb catalyst E1 for purifying diesel engine exhaust gas: select a metal honeycomb carrier with a main material of 0Cr25Al5, a mesh density of 300 mesh, and an overall size of 50mm×50mm×50mm, and pretreat it in an air atmosphere at 600°C for 3 hours; 16g of 98% copper nitrate and 585g of 98% manganese nitrate are mixed according to different proportions, ammonium bicarbonate solution is continuously added dropwise to the mixed solution until Ph=8, and the precipitation is about one hour. Drying at 623K for 12h, and roasting at 623K to obtain Cu0.01Mn0.5 (623k); 1500g of titanium dioxide, 60g of ammonium metavanate, 30g of cerium nitrate and 300g of copper-manganese composite Cu0.01Mn0.5 (350°C ) to mix, then add 3300g deionized water, stir to obtain slurry, and control the slurry ball mill particle size to D 90 = 30 microns; dip the pretreated metal honeycomb carrier in the slurry, stay for 2 seconds, and lift it out at a speed of 30mm per seco...

Embodiment 2

[0028]Preparation of honeycomb catalyst E2 for purifying nitrogen oxides in diesel engine exhaust gas: the specific preparation method is basically the same as that of E1 in this part, the difference is that the copper-manganese composite Cu0.5Mn0.01 (723k) in the raw material contained in the coating is 75g , ammonium metavanadate is 120g, catalyst activity test results see image 3 .

Embodiment 3

[0030] Preparation of metal honeycomb catalyst E3 for purifying diesel engine exhaust gas: the specific preparation method is basically the same as that of E1 in this part, the difference is that the copper-manganese composite Cu0.005Mn0.5 (723k) in the raw materials contained in the coating is 75g, Ammonium is 7.5g, the catalyst activity test result sees image 3 .

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Abstract

The invention discloses a metallic honeycomb catalyst for diesel engine exhaust purification and a preparation method thereof. The technique contains the following features: using the metallic honeycomb as the carrier, mixing titanium dioxide with ammonium metavanadate, cerium nitrate and Cu-Mn complex and the like, adding de-ionized water and stirring uniformly to obtain a suspension, and ball milling the suspension to obtain the slurry, finally soaking the high-temperature pre-treated metallic honeycomb carrier in the slurry, taking-out, drying and baking to obtain the metallic honeycomb catalyst for diesel engine exhaust purification. The invention has the advantages of better heat transfer and lower catalyst bed temperature by employing the lower air-resistance of the metallic honeycomb carrier. The catalytic activity of the catalyst at low temperature is improved while the higher catalytic activity at high temperature thereof is ensured due to adding a certain amount of Cu / Mn complex to the coat, thus greatly widens the working temperature range of the catalyst. Therefore, the catalyst can effectively lower the catalyst cost and improve the catalyst activity.

Description

technical field [0001] The invention relates to a metal honeycomb catalyst for purifying diesel engine exhaust gas and a preparation method thereof, belonging to the technical field of catalytic combustion method for purifying motor vehicle exhaust emissions. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants and the main precursors of photochemical smog. Controlling and treating the pollution of nitrogen oxides has always been a research hotspot in the field of international environmental protection. NOx in motor vehicle exhaust has become the main source of urban air pollution today. In recent years, due to the increasing share of diesel vehicles in automobiles, the control of pollutants emitted by diesel vehicles in various countries has become increasingly strict. It is difficult to meet the requirements of future emission regulations only by internal measures, and corresponding after-treatment technologies must be adopted. The remova...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/02B01D53/94
Inventor 刘洋褚霞王家明邓海滨徐岘
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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