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Efficient oxidation catalyst for diesel vehicle tail gas purification and preparation method and application thereof

An oxidation catalyst and tail gas purification technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high-cost promotion of noble metal-based catalysts and easy generation of catalytic activity Sulfate, low catalyst activity and other problems, to achieve the effect of excellent reusability, excellent resistance to water vapor poisoning, and simple preparation process

Active Publication Date: 2015-10-14
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-noble metal DOC catalysts, such as: Cu-based compounds, Ce-based compounds, perovskite oxides, etc., generally have the problem of low catalyst activity; while noble metal catalysts are still the main active components of DOC, such as: Pt, Pd, etc., they It has excellent catalytic oxidation performance for CO and CH compounds in diesel vehicle exhaust, but its high catalytic activity is also prone to produce sulfate, causing sulfur poisoning and deactivation of the catalyst
In addition, the high cost of noble metal-based catalysts also limits its promotion to a certain extent.

Method used

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  • Efficient oxidation catalyst for diesel vehicle tail gas purification and preparation method and application thereof
  • Efficient oxidation catalyst for diesel vehicle tail gas purification and preparation method and application thereof
  • Efficient oxidation catalyst for diesel vehicle tail gas purification and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Weigh 0.007mol potassium permanganate and 0.003mol cerium nitrate hexahydrate, and dissolve them in 40mL deionized water under stirring in a water bath at 80°C to form a uniform solution; measure 10mL hydrogen peroxide and add dropwise to the above homogeneous solution After 12 hours of oxidation-reduction reaction, vacuum filtration, washing with a large amount of water, drying in an oven at 80°C to obtain a precursor, calcining in a muffle furnace at 550°C for 4 hours to obtain a non-precious metal mesoporous composite oxide catalyst, Recorded as: Ce-Mn.

[0056] Figure 1a and Figure 1b For the prepared CeMnO of this embodiment x TEM and EDS photos of the catalyst. Depend on Figure 1a and Figure 1b It can be seen that the material has a good pore structure, and the prepared material contains elements Mn, Ce and O.

Embodiment 2

[0058] Weigh 0.005mol of copper acetate, 0.01mol of manganese acetate and 0.005mol of cerium nitrate, and dissolve them in 50mL of deionized water while stirring in a water bath at 40°C to form a uniform solution; measure 20mL of hydrogen peroxide and add it dropwise to the above homogeneous solution And keep stirring, after reacting for 12 hours, vacuum filtration, washing with a large amount of water, drying in an oven at 60°C to obtain a precursor, and calcining in a muffle furnace at 550°C for 4 hours to obtain a non-precious metal mesoporous composite oxide catalyst, which is recorded as: Cu-Mn-Ce.

[0059] figure 2 It is the SEM and elemental distribution diagram of the Cu-Mn-Ce catalyst prepared in this example. Depend on figure 2 It can be seen that the material has a good pore structure, and the elements Mn, Cu, Ce and O are uniformly distributed throughout the material.

Embodiment 3

[0061] A synthesis process similar to that of Example 2 was adopted, except that 0.0015 mol of zirconium nitrate was added to the precursor solution to prepare a Cu-Mn-Ce-Zr mesoporous composite oxide catalyst.

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Abstract

The invention relates to an efficient oxidation catalyst for diesel vehicle tail gas purification and a preparation method and application thereof. The active component of the catalyst is a Cu-Mn-Ce-Zr composite oxide, the catalyst is of a mesoporous structure, and the loading capacity of Ce is 30% to 40%, the loading capacity of Mn is 60%-70%, the loading capacity of Cu is 0 to 10%, and the loading capacity of Zr is 0 to 3% in percentages by weight.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, in particular to a high-efficiency catalytic oxidation of CO and C used for the purification of diesel vehicle exhaust 3 h 6 , C 3 h 8 Non-noble metal mesoporous composite oxide catalyst and preparation method thereof. Background technique [0002] As a highly efficient and energy-saving power machine, diesel vehicles are widely used in real life. However, toxic gases such as CO, CH compounds, NOx and soot particles in the exhaust gas of diesel engines also seriously endanger the environment and human health. Therefore, with the continuous increase in the number of diesel vehicles and strict regulations on diesel vehicle exhaust emissions, the post-treatment technology for diesel vehicle exhaust has also developed rapidly. [0003] The diesel oxidation catalyst (DOC) oxidizes CO, CH and SOF to CO through the oxidation of the catalyst 2 and H 2 O, so as to achieve the purpose of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/64B01D53/94B01D53/62B01D53/72
CPCY02A50/20
Inventor 谢治国周晓霞陈英陈航榕施剑林
Owner 江苏先进无机材料研究院
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