Ag-doped modified manganese-based mullite oxidation catalyst and preparation and application thereof

An oxidation catalyst, silver doping technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, heterogeneous catalyst chemical element, etc. Due to the large particle size and size of the nano-Ag particles, the effects of fast SCR reaction, high NO conversion rate, and simple preparation method are achieved.

Active Publication Date: 2019-07-16
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

Method used

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  • Ag-doped modified manganese-based mullite oxidation catalyst and preparation and application thereof
  • Ag-doped modified manganese-based mullite oxidation catalyst and preparation and application thereof
  • Ag-doped modified manganese-based mullite oxidation catalyst and preparation and application thereof

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 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.

[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 for an Ag-doped modified manganese-based mullite catalyst and an application of the Ag-doped modified manganese-based mullite catalyst in a motor vehicle exhaust gas purification aftertreatment system. The catalyst is prepared through an in-situ complexing combustion method; and the method achieves uniform mixing of Ag and mullite, Ag modification of manganese-based mullite is achieved through high-temperature roasting, and the Ag-doped modified manganese-based mullite catalyst with high oxidation activity is obtained. The process has the following advantages: (1) by adopting the in-situ complexing combustion method, the dispersity of Ag nanoparticles in a mullite matrix can be improved; (2) the generation and transfer of an active oxygen speciescan be accelerated by Ag doped modification, and thus, the catalytic oxidation of NO and soot activity of the manganese-based mullite are further improved; and (3) the catalyst has excellent hydrothermal stability and sulfur oxide poisoning resistance. The catalyst is simple in preparation method, short in preparation cycle and low in cost, is applicable to oxidation of soot particles and nitrogen oxides in motor vehicle exhaust gases and has a good application prospect.

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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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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