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Diesel particulate filter loaded with macroporous perovskite oxide and its application

A technology of perovskite oxides and particle traps, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor high temperature stability, and achieve It is not easy to fall off, the method is practical and effective, and the effect of efficient catalytic oxidation removal

Active Publication Date: 2022-02-08
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no strategy to efficiently load macroporous oxide catalysts on DPFs without a binder coating (such as alumina, and aluminum sols have poor high-temperature stability).

Method used

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  • Diesel particulate filter loaded with macroporous perovskite oxide and its application
  • Diesel particulate filter loaded with macroporous perovskite oxide and its application
  • Diesel particulate filter loaded with macroporous perovskite oxide and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a three-dimensional ordered macroporous perovskite La 0.8 K 0.2 CoO 3 The method for skeleton growth to the surface of a diesel particulate filter (DPF), the specific steps are as follows:

[0054] (1) Cleaning of DPF substrate

[0055] A commercial DPF substrate (channel 1.5mm×1.5mm) was cut into cube samples with a size of 1.5cm×1.5cm×1cm, followed by ultrasonic cleaning with distilled water, hexane, acetone and ethanol. The cleaning time of each solvent is 10 minutes; after cleaning, put the DPF substrate in an oven at 80° C. for 2 hours to dry for use.

[0056] (2) Perovskite La 0.8 K 0.2 CoO 3 Preparation of precursor sol

[0057] Dissolve 1.92mM lanthanum nitrate, 0.48mM potassium nitrate, and 2.4mM cobalt nitrate in a mixed solvent of 15ml ethylene glycol and 10mL methanol, ultrasonically dissolve and disperse it completely, then stir continuously at room temperature for 4h, and finally stand still for 24h to obtain calcium Titani...

Embodiment 2

[0075] In order to further evaluate the catalytic activity of the catalyst of the present invention, the present invention uses soot particulate matter catalytic combustion activity evaluation experiment and soot particulate matter loading experiment for evaluation.

[0076] The catalytic combustion activity evaluation test of soot particles was carried out in a fixed-bed reactor simulated by a quartz tube with a diameter of 23mm. Pack 800 mg of the monolithic catalyst (about 70-80 mg perovskite active component) manufactured in Example 1 of the present invention into a quartz tube, place the quartz tube in a tube furnace, and use a temperature program to raise the temperature from room temperature to To 700°C, the heating rate is 2°C / min. The reaction gas composition (volume fraction) is: 10% O 2 ,90% N 2 , the total flow rate is 100mL / min, and the mass space velocity is 75000mL / (g h). CO in the final reaction tail gas 2 The concentrations of CO and CO were analyzed onlin...

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Abstract

The invention discloses a catalytic diesel particle filter loaded with macroporous perovskite oxide and an application thereof. In the present invention, the catalytic diesel particle filter loaded with macroporous perovskite oxide is directly placed on the surface of the honeycomb channel by using polystyrene microspheres / perovskite oxide nanoparticle coating / diesel particle filter as a template. A perovskite oxide skeleton layer with macropores is formed. The present invention directly forms a perovskite oxide framework layer with large pores on the surface of the honeycomb channel, so that the perovskite oxide framework layer can be fixed in the honeycomb channel without using an adhesive, which is different from the traditional powder type Compared with the coating of monolithic catalysts, the ordered macroporous catalysts loaded on the surface show a certain spatial structure, which can enhance the ability of the diesel particulate filter to capture soot particles to a certain extent, and promote the integration of soot particles and surface macropores. The catalysts are in contact with each other, and can effectively reduce the back pressure, thereby improving the catalytic combustion activity of soot particles and CO 2 selective.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a catalytic diesel particulate filter loaded with macroporous perovskite oxide and its application, in particular to a new type of catalytic diesel fuel supported by in-situ grown macroporous perovskite oxide Particle traps and their applications. Background technique [0002] Due to the advantages of low fuel consumption and high power, diesel engines are widely used in industrial engineering vehicles, and their superior fuel economy makes the dieselization of motor vehicles continue to increase. However, the lower combustion chamber temperature of the diesel engine also increases the incomplete combustion products and soot particles in the exhaust of diesel vehicles, causing serious harm and burden to the environment and human health. In particular, the emission of soot particles in the exhaust of diesel vehicles is about 30 to 80 times that of gasoline vehicles, result...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/035B01J23/83
CPCF01N3/035B01J23/83
Inventor 郭彦炳杨吉
Owner HUAZHONG NORMAL UNIV
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