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Prepn of oxidizing catalyst for controlling exhaust of diesel truck

An oxidation catalyst, emission control technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as poisoning, conversion capacity decline, catalyst deactivation, etc. , to achieve high catalytic oxidation performance, control diesel vehicle emissions, and reduce the increase in total particulate matter emissions

Inactive Publication Date: 2004-11-24
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, these sulfuric acid and sulfates will also deactivate and poison the catalyst, thereby reducing the conversion ability of the catalyst to pollutants such as CO, HC and SOF in the exhaust of diesel vehicles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0006] Example 1: Pt / Al 2 o 3 catalyst

[0007] γ-Al 2 o 3 Alumina slurry (with a solid content of 30%) as the main component is coated on a cordierite honeycomb carrier, dried in the shade at room temperature and then dried at 110°C for 2 hours, and then calcined at 450°C for 2 hours to obtain a catalyst carrier with an alumina coating. The coating rate of the alumina coating material is 5-12wt%. H 2 PtCl 6 The solution was loaded onto the catalyst carrier with a Pt content of 1.4 g / L by an equal-volume impregnation method, dried in the shade overnight at 110°C for 2 hours, then calcined in air at 450°C for 2 hours, and finally heated in H 2 The reduction was carried out at 410°C for 2 hours in the atmosphere.

example 2

[0008] Example 2: Pt / V / Al 2 o 3 catalyst

[0009] γ-Al 2 o 3 Alumina slurry (with a solid content of 30%) as the main component is coated on a cordierite honeycomb carrier, dried in the shade at room temperature and then dried at 110°C for 2 hours, and then calcined at 450°C for 2 hours to obtain a catalyst carrier with an alumina coating. The coating rate of the alumina coating material is 5-12wt%. H 2 PtCl 6 The solution was loaded onto the catalyst carrier with a Pt content of 1.4 g / L by an equal-volume impregnation method, dried in the shade overnight at 110°C for 2 hours, then calcined in air at 450°C for 2 hours, and finally heated in H 2 The reduction was carried out at 410°C for 2 hours in the atmosphere. Finally, the vanadyl solution is loaded on the catalyst by the method of equal volume impregnation, V 2 o 5 The loading capacity of the catalyst was 2 g / L, dried in the shade overnight at 110°C for 2 hours, and then calcined in air at 400°C for 2 hours to obt...

example 3

[0010] Example 3: Pt / V / Al 2 o 3 catalyst

[0011] Preparation conditions and preparation procedure are the same as example 2, just change the load capacity of vanadyl solution, make V on the catalyst 2 o 5 The load is 3g / L.

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PUM

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Abstract

The flowing oxidizing catalyst for controlling exhaust of diesel truck has low CO and HC initiating temperature, high reaction activity and high sulfur poisoning resistance for exhaust of diesel truck. The catalyst of the present invention can inhibit the oxidation of SO2 in tail gas and lower the amount of produced sulfuric acid and sulfate of tail gas to reduce total grain exhaust in tail gas. The oxidizing catalyst of the present invention has carrier coating with the main components of active alumina, titania and composite oxide, loaded noble metal Pt(Pd) as main active component and metal oxide as assistant component in inhibiting the oxidation of SO2. The catalyst has high low temperature CO and HC eliminating capacity and excellent capacity of inhibiting oxidation of SO2 into SO3.

Description

1. Technical field [0001] The invention relates to the composition and preparation method of an oxidation catalyst for purifying exhaust gas from diesel vehicles. The developed catalyst can effectively reduce the emission of CO, HC and total particulate matter in the exhaust gas of diesel vehicles. 2. Background technology [0002] Gaseous CO, HC, SO are contained in the exhaust emitted by diesel vehicles 2 And NOx, also contains solid and liquid particulate matter, these particulate matter is mainly composed of dry carbon (Soot), dissolved organic fraction (SOF) and a small amount of sulfuric acid and sulfate. The main components of SOF are liquid hydrocarbons such as unburned fuel oil and lubricating oil. These liquid hydrocarbons exist in the form of aerosols and / or adsorbed on carbon deposits in the exhaust gas. Due to the differences in the combustion process and combustion temperature of diesel engine fuel , SOF can account for more than 2 / 3 of total particulate matte...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J23/648
Inventor 郝郑平康守方於俊杰胡春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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