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A silver-doped modified manganese-based mullite oxidation catalyst and its preparation and application

An oxidation catalyst, mullite technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, heterogeneous catalyst chemical element, etc., can solve the problem of large particle size of nano Ag particles, Inability to give full play to the role of nano-Ag and other problems to achieve high NO conversion rate, favorable fast SCR reaction, and strong water and sulfur resistance

Active Publication Date: 2021-05-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the nano-Ag particles obtained in this report is relatively large (51-64nm), and the effect of nano-Ag cannot be fully exerted.

Method used

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  • A silver-doped modified manganese-based mullite oxidation catalyst and its preparation and application
  • A silver-doped modified manganese-based mullite oxidation catalyst and its preparation and application
  • A silver-doped modified manganese-based mullite oxidation catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the in-situ complexation combustion method is used to prepare Ag-doped modified manganese-based mullite Ag 0.05 -Sm 0.95 mn 2 o 5 Catalyst, the complexing agent used is citric acid, the solvent is water, the molar ratio of citric acid to metal mixed salt (Ag source, Sm source and Mn source) is 1.1:1, and the roasting condition is 800 ℃ roasting in muffle furnace 5 hours.

[0025] The specific process is as follows: Weigh 0.7493g samarium nitrate, 0.01507g silver nitrate, 1.2703g manganese nitrate, dissolve in 100mL distilled water, 1.1252g citric acid, after stirring and dissolving, heat up to 80°C until the reaction is complete, collect the obtained powder, place Dry it in an oven at 110°C, bake it in a muffle furnace at 300°C for 1 hour, then raise the temperature to 800°C and continue roasting for 5 hours. The obtained catalyst is named Ag 0.05 -Sm 0.95 mn 2 o 5 , to test the catalytic NO and soot oxidation activity of the catalyst.

Embodiment 2

[0027] In this example, the in-situ complexation combustion method is used to prepare Ag-doped modified manganese-based mullite Ag 0.1 -Sm 0.9 mn 2o 5 Catalyst, the complexing agent used is citric acid, the solvent is water, the molar ratio of citric acid and metal mixed salt (Ag source, Sm source and Mn source) is 1.1:1, and the roasting condition is 800 ℃ roasting in muffle furnace 5 hours.

[0028] The specific process is as follows: Weigh 0.7144g samarium nitrate, 0.03034g silver nitrate, 1.2783g manganese nitrate, dissolve in 100mL distilled water, 1.1323g citric acid, after stirring and dissolving, heat up to 80°C until the reaction is complete, collect the obtained powder, place Dry it in an oven at 110°C, bake it in a muffle furnace at 300°C for 1 hour, then raise the temperature to 800°C and continue roasting for 5 hours. The obtained catalyst is named Ag 0.1 -Sm 0.9 mn 2 o 5 , to test the catalytic NO and soot oxidation activity of the catalyst.

Embodiment 3

[0030] In this example, the in-situ complexation combustion method is used to prepare Ag-doped modified manganese-based mullite Ag 0.2 -Sm 0.8 mn 2 o 5 Catalyst, the complexing agent used is citric acid, the solvent is water, the molar ratio of citric acid and metal mixed salt (Ag source, Sm source and Mn source) is 1.1:1, and the roasting condition is 800 ℃ roasting in muffle furnace 5 hours.

[0031] The specific process is as follows: Weigh 0.6431g samarium nitrate, 0.0615g silver nitrate, 1.2947g manganese nitrate, dissolve in 100mL distilled water, 1.1468g citric acid, after stirring and dissolving, heat up to 80°C until the reaction is complete, collect the obtained powder, place Dry it in an oven at 110°C, bake it in a muffle furnace at 300°C for 1 hour, then raise the temperature to 800°C and continue roasting for 5 hours. The obtained catalyst is named Ag 0.2 -Sm 0.8 mn 2 o 5 , to test the catalytic NO and soot oxidation activity of the catalyst.

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Abstract

The invention provides a preparation method of a silver-doped modified manganese-based mullite catalyst and its application in a motor vehicle tail gas purification post-treatment system. The catalyst is prepared by an in-situ complexation combustion method, which realizes the uniform mixing of silver species and mullite, and then undergoes high-temperature roasting to realize silver modification of manganese-based mullite, and obtains a highly oxidatively active Silver-doped modified manganese-based mullite catalyst. This process has the following advantages: (1) The dispersion of silver nanoparticles in the mullite matrix can be improved by using the in-situ complexation combustion method; (2) The silver doping modification can accelerate the generation and transfer of "active oxygen" species , to further improve the catalytic oxidation NO and soot activity of manganese-based mullite; (3) The catalyst has excellent hydrothermal stability and anti-sulfur oxide poisoning performance. The preparation method of this type of catalyst is simple, the preparation period is short, and the cost is low, and it is suitable for the oxidation of soot particles and nitrogen oxides in motor vehicle exhaust, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials for purifying motor vehicle exhaust gas and the preparation thereof, in particular to an Ag-silver doped modified manganese-based mullite oxidation catalyst and its preparation and application. Background technique [0002] With the increase of the number of motor vehicles in our country, motor vehicle exhaust has become an important source of air pollution. In order to reduce the soot particles and NO in the exhaust gas x For emissions, particulate filter (DPF) and selective catalytic reduction (SCR) technologies are often used in industry. DPF captures soot particles through porous ceramics, and uses high temperature to oxidize soot to CO 2 , to realize the regeneration of the filter, coating the DPF with a highly active catalyst, the so-called catalytic particulate filter (CDPF), can reduce the temperature and regeneration frequency required for regeneration, thereby reducing fuel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68B01D53/94B01D53/56B01D49/00
CPCB01D49/00B01D53/9418B01D2257/404B01D2258/012B01J23/002B01J23/688B01J2523/00B01J2523/18B01J2523/3737B01J2523/72
Inventor 吴晓东靳保芳赵保槐冉锐司知蠢翁端
Owner TSINGHUA UNIV
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