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A kind of bird's nest-shaped soot combustion catalyst and its preparation method and application

A soot combustion and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low activity of fully contacted catalysts and high cost of porous structure preparation , the high cost of precious metals, etc., to achieve large-scale industrial application prospects, easy operation and scaled production, and low cost.

Active Publication Date: 2019-05-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common catalysts for soot particle oxidation, such as: CeO 2 Based compounds, perovskite oxides, noble metal-based catalysts, etc., or because the lack of porous structure is not conducive to sufficient contact between the active sites and carbon particles, resulting in low catalyst activity, or because the preparation cost of the porous structure is too high, Or because of the high cost and easy poisoning of precious metals, which limits its scale application

Method used

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  • A kind of bird's nest-shaped soot combustion catalyst and its preparation method and application
  • A kind of bird's nest-shaped soot combustion catalyst and its preparation method and application
  • A kind of bird's nest-shaped soot combustion catalyst and its preparation method and application

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Effect test

Embodiment 1

[0043] Dissolve a total of 52.35mmol of Cu, Ce, and Zr nitrates in 225mL of water, the molar ratio of Cu / Ce / Zr is 23:54:23, add 451.85mmol of urea after the dissolution is complete, stir and dissolve, and place in a water bath at 80°C Stir and react for 6.5 hours; after sealing, continue to treat in a 95°C drying oven for 11 hours; wash and dry and then calcinate: calcine in static air at 350°C for 2 hours, heat up at 1°C per minute, and cool with the furnace. The specific surface area of ​​the catalyst prepared in this embodiment is 186m 2 / g, the pore diameter is 33nm, and the pore volume is 0.90cm 3 / g.

[0044] figure 1 CuCeZrO obtained for the embodiment of the present invention x The transmission electron microscope photos and element distribution diagrams of the composite oxide show that at the micron scale, the product is formed by random accumulation of nanowires, forming a bird's nest-like morphology structure, wherein the nanowires in the bird's nest-like soot co...

Embodiment 2

[0050] In the fixed-bed reactor, the CuCeZrO of 0.1g prepared by the embodiment 1 method is loaded into x The mixture of composite oxide catalyst and 0.01g of soot particles is passed into the following mixed gas at room temperature: the concentration of NO is 500ppm, O 2 The concentration is 10(V)%, and the total flow rate is 0.2L / min.

[0051] As a comparison, another set of tests was carried out, and the above atmosphere was changed to: NO 500ppm, O 2 10(V)%, SO 2 100ppm, water vapor 10(V)%, the total flow rate is 0.2L / min, and other test parameters remain unchanged.

[0052] Test the conversion effect of the catalyst on soot particles in the temperature range of 100-700°C, the results are listed in Figure 4 . It can be seen that the catalyst can quickly oxidize and eliminate carbon particles at 400-450 ° C, and introduce high concentrations of SO into the reaction atmosphere 2 , H 2 O did not significantly affect the catalytic activity.

Embodiment 3

[0054] In the fixed-bed reactor, the CuCeZrO of 0.1g prepared by the embodiment 1 method is loaded into x Composite oxide catalyst, feed the following mixed gas at room temperature: CO (0.5%), C 3 h 6 (400ppm), C 3 h 8 (200ppm), O 2 (5%), nitrogen is the balance gas, and the total flow rate is 0.2L / min.

[0055] Test the conversion effect of the catalyst on soot particles in the temperature range of 50-430°C, the results are listed in Figure 5 . It can be seen that the catalyst can completely oxidize and eliminate common pollutants in diesel vehicle exhaust such as carbon monoxide, propylene, propane, etc. below 400 ° C, which proves that the catalyst has a certain practical potential.

[0056] In summary, CuCeZrO of the present invention x The composite oxide catalyst can realize rapid catalytic removal of soot particles in diesel vehicle exhaust in a lower temperature range. The catalyst has excellent sulfur resistance and water vapor poisoning resistance, strong ap...

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Abstract

The invention relates to a bird's nest-shaped soot combustion catalyst and its preparation method and application. The bird's nest-shaped soot combustion catalyst is a composite oxide catalyst with a bird's nest-like structure morphology formed by stacking nanowires. The composite oxide catalyst contains transition metal elements Cu+Ce+Zr. The present invention adopts a homogeneous co-precipitation method to prepare a soot combustion catalyst. The calcined product has good crystallization, can make the soot particles reach the maximum combustion rate at about 400°C, and has very good water and sulfur resistance.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a bird's nest-shaped soot combustion catalyst used for purifying soot particles in diesel vehicle exhaust, a preparation method and application thereof. Background technique [0002] Diesel vehicles are widely used in real life due to their advantages of economy, high thermal efficiency and long range. However, particulate matter (PM, mainly carbon black particles) and nitrogen oxides emitted by diesel engines seriously endanger the environment and human beings. Therefore, an efficient post-treatment purification process is imperative. Usually, a particulate filter (DPF) is used to collect carbon black particles in diesel vehicle exhaust, and the collected carbon black particles can be decomposed at a relatively high temperature (>600°C) by O 2 oxidation. However, the exhaust temperature of a diesel engine is generally between 150 and 400°C, and the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J35/04B01J35/10F01N3/023
CPCF01N3/023B01J23/83B01J35/56B01J35/635B01J35/647B01J35/615
Inventor 赵晗周晓霞王敏潘琳钰陈航榕施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI