A kind of composite oxide and its preparation and application as carbon particle combustion catalyst

A technology of composite oxides and co-solvents, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of poor catalytic activity and low catalyst cost problem, achieve the effect of low cost, low catalytic temperature and simple preparation method

Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention solves the technical problem of poor catalytic activity of carbon particle combustion catalysts in the prior art, and provides a spinel-modified mullite composite oxide catalyst for carbon particle combustion, which can be used in a wide temperature range Efficiently deep oxidation of carbon particles into carbon dioxide, the catalyst is low in cost, has good thermal stability, can maintain high catalytic activity for a long time, and significantly improves the removal efficiency of carbon particles in automobile exhaust, and the preparation method of the catalyst Simple, easy to operate, suitable for large-scale industrial applications

Method used

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  • A kind of composite oxide and its preparation and application as carbon particle combustion catalyst
  • A kind of composite oxide and its preparation and application as carbon particle combustion catalyst
  • A kind of composite oxide and its preparation and application as carbon particle combustion catalyst

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation formula is 0.1KMn 2 o 4 -0.9SmMn 2 o 5 Spinel-modified mullite-type composite oxide catalysts for carbon particle combustion. Weigh samarium nitrate [Sm(NO 3 ) 3 ·6H 2 O] 2.0007g (0.0045mol), manganese nitrate [Mn(NO 3 ) 3 4H 2 O] 2.5100g (0.01mol), potassium nitrate (KNO 3 ) 0.05055g (0.005mol), was added to the mixture of 6.5ml ethylene glycol and 3.5ml methanol, followed by citric acid [C 6 h 8 o 7 ·H 2 O] 3.4673g (0.015mol) and stirred for 4h to fully dissolve to obtain a catalyst precursor. Then, the temperature was raised to 400°C at a heating rate of 1°C / min and kept for 4 hours, and continued to be heated at the same heating rate to 700°C, kept for 4 hours, and then naturally cooled to room temperature to obtain a tan powder sample.

[0032] Through the analysis and identification of powder X-ray diffraction pattern, the results are as follows: figure 2 From the second line, it can be seen that the powder is mainly spinel-modified...

Embodiment 2

[0034] The preparation formula is 0.2KMn 2 o 4 -0.8SmMn 2 o 5 Spinel-modified mullite-type composite oxide catalysts for carbon particle combustion. Weigh samarium nitrate [Sm(NO 3 ) 3 ·6H 2 O] 1.7784g (0.004mol), manganese nitrate [Mn(NO 3 ) 3 4H 2 O] 2.5100g (0.01mol), potassium nitrate (KNO 3 ) 0.1011g (0.001mol), was added to the mixture of 6.5ml ethylene glycol and 3.5ml methanol, followed by citric acid [C 6 h 8 o 7 ·H 2 O] 3.4673g (0.015mol) and stirred for 4h to fully dissolve to obtain a catalyst precursor. Then, the temperature was raised to 400°C at a heating rate of 1°C / min and kept for 4 hours, and continued to be heated at the same heating rate to 700°C, kept for 4 hours, and then naturally cooled to room temperature to obtain a tan powder sample.

[0035] Through the analysis and identification of powder X-ray diffraction pattern, the results are as follows: figure 2 From the first line, it can be seen that the powder is mainly spinel-modified mu...

Embodiment 3

[0037] The preparation formula is 0.3KMn 2 o 4 -0.7SmMn 2 o 5 Spinel-modified mullite-type composite oxide catalysts for carbon particle combustion. Weigh samarium nitrate [Sm(NO 3 ) 3 ·6H 2 O] 1.5561g (0.0035mol), manganese nitrate [Mn(NO 3 ) 3 4H 2 O] 2.5100g (0.01mol), potassium nitrate (KNO 3 ) 0.1517g (0.0015mol), was added to the mixture of 6.5ml ethylene glycol and 3.5ml methanol, followed by citric acid [C 6 h 8 o 7 ·H 2 O] 3.4673g (0.015mol) and stirred for 4h to fully dissolve to obtain a catalyst precursor. Then, the temperature was raised to 400°C at a heating rate of 1°C / min and kept for 4 hours, and continued to be heated at the same heating rate to 700°C, kept for 4 hours, and then naturally cooled to room temperature to obtain a tan powder sample.

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Abstract

The invention relates to a composite oxide and a preparation thereof and an application thereof as a carbon particle combustion catalyst, and belongs to the technical field of catalysts for carbon particle combustion. A chemical general formula of the composite oxide is xAB2O4.(1-x)A'B2O5, wherein A is an alkali metal element or an alkaline earth metal element, A' is a rare earth metal element, Bis a first transition metal element, and a value range of x is 0<x<1. The preparation method is as follows: dissolving an alkali metal salt, a rare earth metal salt and a first transition metal salt in a mixed solution of an organic solvent and a co-solvent, or dissolving an alkaline earth metal salt, a rare earth metal salt and a first transition metal salt in a mixed solution of an organic solvent and a co-solvent, then adding an organic complexing agent to form a precursor, and then performing roasting to obtain the composite oxide catalyst. The catalyst can efficiently and deeply oxidize carbon particles into carbon dioxide at a relatively low temperature and in a relatively wide temperature range, has low cost, has good thermal stability, and can maintain relatively high catalytic activity for a long time.

Description

technical field [0001] The invention belongs to the technical field of catalysts for carbon particle combustion, and more specifically relates to a spinel-modified mullite-type composite oxide and its preparation and application as a carbon particle combustion catalyst. Background technique [0002] The use of micro-particle traps is the most important exhaust post-treatment method to reduce carbon particles emitted by diesel locomotives. It mainly collects carbon particles to prevent them from entering the atmosphere and regularly removes the captured carbon particles to achieve trap regeneration. The removal efficiency of particulate matter can reach 90% %above. The particulate filter itself only has the function of filtering and trapping. With the deposition of particulate matter during use, the back pressure of the engine increases and the performance of the engine decreases. Therefore, it is necessary to remove carbon particles regularly to restore the filter performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34F01N3/025F01N3/035
CPCB01J23/002B01J23/005B01J23/34B01J2523/00F01N3/025F01N3/035B01J2523/13B01J2523/3737B01J2523/72
Inventor 单斌陈永杰贾莉伟陈蓉岳军杜纯
Owner HUAZHONG UNIV OF SCI & TECH
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