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Monolithic catalyst having macroporous cerium manganese oxide skeleton and preparation method thereof

A technology of oxides and catalysts, which is applied in the field of directly growing three-dimensional ordered macroporous cerium manganese oxide frameworks on the surface of cordierite DPF, which can solve the problems of increasing back pressure and reducing the ignition temperature of soot particles, which is not easy to achieve Shedding, the method is practical and effective, and the effect of strong controllability

Pending Publication Date: 2020-07-07
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The three-dimensional ordered macroporous catalysts prepared by the prior art are only limited to the theoretical research stage of powders. Therefore, there is a special need for a direct three-dimensional ordered macroporous cerium-manganese oxide catalyst under the condition of no binder. The method of growth on the substrate, in particular, can reduce the ignition temperature of soot particles and avoid the increase of back pressure caused by the blockage of the diesel particulate filter (DPF) pores

Method used

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  • Monolithic catalyst having macroporous cerium manganese oxide skeleton and preparation method thereof
  • Monolithic catalyst having macroporous cerium manganese oxide skeleton and preparation method thereof
  • Monolithic catalyst having macroporous cerium manganese oxide skeleton and preparation method thereof

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Embodiment 1

[0051] This embodiment provides a three-dimensional ordered macroporous cerium manganese oxide Ce 0.6 mn 0.4 o 2 (3DOM CeMnO 2 ) skeleton growth to the method for cordierite DPF surface, concrete steps are as follows:

[0052] 1. Washing of cordierite DPF carrier

[0053] Cut a commercial cordierite DPF (square channel 3mm×3mm) into a cube-shaped sample with a size of 6channel*7channel*1cm, and then ultrasonically clean it with distilled water, n-hexane, acetone, and ethanol in sequence, and the cleaning time of each solvent is 10min ; Then put the cleaned cordierite DPF carrier into an oven at 80°C for 12 hours to dry to obtain a dry and clean cordierite DPF substrate for use;

[0054] 2. Preparation of colloidal solution of cerium manganese oxide precursor

[0055] Dissolve 15mM cerium nitrate, 10mM manganese nitrate, and 25mM citric acid monohydrate in 50mL ethanol solvent, ultrasonically dissolve and disperse it completely, and then stir continuously at room temperatu...

Embodiment 2

[0072] In order to further evaluate the catalytic activity of the catalyst of the present invention, the present invention uses soot particulate matter low-temperature catalytic oxidation activity evaluation experiment for evaluation.

[0073] The catalytic oxidation activity evaluation experiment of soot particles (Soot) was carried out in a fixed-bed reactor simulated by a quartz tube with a diameter of 23mm. 800mg of monolithic catalyst (about 80mg of cerium manganese oxide active component and the quality of soot is 8mg) is loaded in a quartz tube, the quartz tube is placed in a tube furnace, and the temperature is programmed to rise. The temperature rise program is: from room temperature to Heat to 200°C and keep it warm for 30min at a heating rate of 10°C / min, then raise the temperature from 200°C to 700°C at a heating rate of 2°C / min, then keep at 700°C for 30min. The total gas flow rate is 50mL / min, O 2 10% of the total traffic, the rest is N 2 . Finally, the tail g...

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Abstract

The invention discloses a monolithic catalyst having a macroporous cerium-manganese oxide skeleton and a preparation method thereof. According to the catalyst, a diesel engine particle catcher (DPF) with honeycomb ducts is used as a carrier, a macroporous cerium-manganese oxide skeleton layer is directly arranged on a cerium-manganese oxide nanoparticle coating on the surfaces of the honeycomb ducts, and the macroporous cerium-manganese oxide skeleton is provided with hollow holes which are communicated with one another. According to the invention, the macroporous cerium-manganese oxide skeleton layer is directly arranged on the cerium-manganese oxide nanoparticle coating, so that the macroporous cerium-manganese oxide skeleton layer can be fixed in a honeycomb duct without using an adhesive, and the temperature of catalytic oxidation of soot particles can be effectively reduced. The raw materials of the catalyst are cheap and easy to obtain, the preparation scheme is simple and easy to implement, large-scale industrial popularization is facilitated, and the catalyst has great industrial application prospects.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a catalyst with a macroporous cerium manganese oxide framework and a manufacturing method thereof, in particular to a method for directly growing a three-dimensional ordered macroporous cerium manganese oxide framework onto the surface of a cordierite DPF. Background technique [0002] The main component of soot particles (soot) emitted by diesel engines is to remove uncombined H 2 The general term for all solid carbon-based particles, liquid fuel oil, engine oil, and inorganic substances agglomerated on the surface of carbon-based particles other than O. In addition to the soot generated during the combustion process of diesel fuel, the soot generated by engine oil in practical applications also accounts for a considerable part. According to the different solubility, soot can be divided into soluble organic matter (SOF) and insoluble organic matter (IOF). For SOF, it ac...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D49/00
CPCB01J23/34B01D53/86B01D49/00Y02A50/20
Inventor 郭彦炳吴剑何泳霖刘小华温海绸
Owner HUAZHONG NORMAL UNIV
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