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Cryptomelane type mixed manganese oxide catalyst for removing soot of diesel vehicle through oxidation

A technology of cryptopotassium manganese ore and manganese oxide, which is applied in the application field of catalytic oxidation to remove soot particles from diesel vehicles, can solve the problems of low melting point of alkali metal catalyst, corrosion of ceramic DPF, poor stability, etc., and achieves mild preparation conditions and simple method Ease of operation, large pore volume effect

Inactive Publication Date: 2020-11-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low melting point and strong alkalinity of alkali metal catalysts also cause defects such as poor stability and corrosion of ceramic DPF.

Method used

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  • Cryptomelane type mixed manganese oxide catalyst for removing soot of diesel vehicle through oxidation
  • Cryptomelane type mixed manganese oxide catalyst for removing soot of diesel vehicle through oxidation
  • Cryptomelane type mixed manganese oxide catalyst for removing soot of diesel vehicle through oxidation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] (1) Weigh 3.25g potassium permanganate (KMnO 4 ) was dissolved in 75 mL of deionized water, recorded as solution Ⅰ; weighed 5.5 g of manganese acetate (MnC 4 h 6 o 4 4H 2 O) Dissolve in 20 mL deionized water, and record it as solution II;

[0023] (2) Stir and mix solution II and 42 mL acetic acid solution (6 wt.%) first, then add solution I dropwise;

[0024] (3) The mixed solution obtained in step (2) was heated to reflux at 50° C. while stirring for 36 h. Wash with absolute ethanol and deionized water successively, dry at 80°C overnight, and finally calcined at 550°C for 5h. After cooling down to room temperature, it was taken out, and the obtained sample was a cryptopotassium manganese-type mixed manganese oxide catalyst, referred to as KMnOx.

example 2

[0026] figure 1 is the XRD spectrum of the prepared sample. XRD analysis found that the as-prepared KMnO x is made of cryptopotassium manganese (K 2-x mn 8 o 16 ) and Mn 2 o 3 Composed of mixed manganese oxides.

example 3

[0028] The specific surface area, pore size distribution and pore volume of the catalyst were carried out on ASAP 2460 automatic specific surface area and porosity analyzer produced by Micromeritics, USA. KMnO x Sample N 2 The adsorption-desorption curve conforms to the type II isotherm in IUPAC, with a hysteresis loop of type H3 in the relatively high pressure range, and in the P / P 0 There is no adsorption limitation when it is close to 1, which indicates that there is a slit-shaped macroporous structure in the sample. The specific surface area of ​​the sample (S BET ), pore volume (V p ) and average pore diameter (D p ) are 42.6 m 2 / g, 0.21 cm 3 / g and 35.6 nm. From the pore size distribution curve ( figure 2 ) shows that the sample is a hierarchical porous structure with micropores, mesopores and macropores, and their proportions are 2%, 55% and 43%, respectively.

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Abstract

The invention relates to a cryptomelane type mixed manganese oxide catalyst for removing soot of a diesel vehicle through oxidation. The chemical structural formula of the catalyst is KMnOx. The catalyst is prepared by taking potassium permanganate, manganese acetate and acetic acid as raw materials through precipitation reaction and calcination. The used raw materials are cheap and easily available, the conditions are mild, the preparation process method is simple, and important scientific significance and good application prospect are achieved. The prepared KMnOx catalyst has large specificsurface area and pore volume, and has hierarchical pore structure characteristics and good oxidation-reduction capability. The catalyst can be used for efficiently catalyzing and oxidizing soot particles of the diesel vehicle.

Description

technical field [0001] The invention relates to the preparation of a cryptopotassium manganese ore-type mixed manganese oxide catalyst for oxidizing and removing soot from diesel vehicles, and its application in catalytic oxidation to remove soot particles from diesel vehicles, belonging to the field of nanomaterial preparation and catalytic application. Background technique [0002] Diesel engines are widely used due to low fuel consumption, high power, high durability and high efficiency. However, particulate matter (PM, mainly soot particles) in diesel vehicle exhaust can enter the human respiratory system, causing lung cancer, bronchitis and other diseases. Great harm to human health. Therefore, an efficient exhaust gas post-treatment process is imperative. Among diesel engine aftertreatment technologies, particulate filter (DPF) is one of the most widely used technologies at present. The particulate filter (DPF) is used to collect soot particles in diesel vehicle exha...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10B01D49/00
CPCB01J23/002B01J23/34B01D49/00B01D2258/012B01J35/613B01J35/633B01J35/647
Inventor 干良然王仲鹏刘文旭高一博刘伟何芳王秀菊王立国
Owner UNIV OF JINAN
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