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A core-shell platinum-based catalyst with controllable acidity and its preparation and application

A core-shell catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, climate sustainability, etc., can solve problems affecting catalytic performance and achieve controllable acidity, The effect of high hydrothermal stability and excellent oxidation ability

Active Publication Date: 2019-08-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, long-term exposure to the temperature of motor vehicle exhaust will also cause irreversible agglomeration and growth of Pt particles, thereby affecting its catalytic performance.

Method used

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  • A core-shell platinum-based catalyst with controllable acidity and its preparation and application
  • A core-shell platinum-based catalyst with controllable acidity and its preparation and application
  • A core-shell platinum-based catalyst with controllable acidity and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]1) Weigh 0.325g of platinum nitrate solution containing 18% platinum nitrate, and 0.7g of polyvinylpyrrolidone (PVP, M=58000), add 60mL of ethylene glycol together, stir vigorously to make it fully dissolve, and let it stand for 1 minute, A clear solution is obtained;

[0035] 2) The clarified liquid obtained in step 1) is heated to 180° C. under the protection of an inert atmosphere (such as nitrogen, helium), continued to stir for 20 minutes, and then cooled to room temperature under the inert atmosphere;

[0036] 3) Add about 200 mL of acetone to the solution obtained in step 2), stir for 5 minutes, and centrifuge at a centrifugal speed of 8000 r / min for 10 minutes to separate the platinum particles from the ethylene glycol. Pour off the supernatant, leaving a brown-black precipitate;

[0037] 4) Add 50 mL of absolute ethanol to the precipitate obtained in step 3), stir for 5 minutes, then add 200 mL of n-hexane, then centrifuge at a centrifugal speed of 8000 r / min f...

Embodiment 2

[0041] 1) Weigh 0.325g of platinum nitrate solution containing 18% platinum nitrate, and 0.7g of polyvinylpyrrolidone (PVP, M=58000), add 60mL of ethylene glycol together, stir vigorously to make it fully dissolve, and let it stand for 1 minute, to obtain a clear solution;

[0042] 2) The clarified liquid obtained in step 1) is heated to 180° C. under the protection of an inert atmosphere (such as nitrogen, helium), continued to stir for 20 minutes, and then cooled to room temperature under the inert atmosphere;

[0043] 3) Add about 200 mL of acetone to the solution obtained in step 2), stir for 5 minutes, and centrifuge at a centrifugal speed of 8000 r / min for 10 minutes to separate the platinum particles from the ethylene glycol. Pour off the supernatant, leaving a brown-black precipitate;

[0044] 4) Add 50 mL of absolute ethanol to the precipitate obtained in step 3), stir for 5 minutes, then add 200 mL of n-hexane, then centrifuge at a centrifugal speed of 8000 r / min fo...

Embodiment 3

[0048] 1) Weigh 0.325g of platinum nitrate solution containing 18% platinum nitrate, and 1.4g of polyvinylpyrrolidone (PVP, M=58000), add 60mL of ethylene glycol together, stir vigorously to make it fully dissolve, and let it stand for 1 minute, A clear solution is obtained;

[0049] 2) The clarified liquid obtained in step 1) is heated to 180° C. under the protection of an inert atmosphere (such as nitrogen, helium), continued to stir for 20 minutes, and then cooled to room temperature under the inert atmosphere;

[0050] 3) Add about 200 mL of acetone to the solution obtained in step 2), stir for 5 minutes, and centrifuge at a centrifugal speed of 8000 r / min for 10 minutes to separate the platinum particles from the ethylene glycol. Pour off the supernatant, leaving a brown-black precipitate;

[0051] 4) Add 50 mL of absolute ethanol to the precipitate obtained in step 3), stir for 5 minutes, then add 200 mL of n-hexane, then centrifuge at a centrifugal speed of 8000 r / min ...

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Abstract

The invention discloses the technical field of tail gas catalyst, and particularly relates to an acidity-controllable core-shell type platinum based catalyst for tail gas catalytic DOC (diesel oxidation catalyst) of a diesel vehicle and a preparation method thereof. The acidity-controllable core-shell type platinum based catalyst has the advantages that the nanometer platinum particles are used as an inner core, and the acid composite oxides, such as SiO2 (silicon dioxide)-Al2O3 (aluminum oxide), SiO2-TiO2 (titanium dioxide) and SiO2-ZrO2 (zirconium dioxide), are used as shells; under the existence of the catalyst, the diesel vehicle tail gas atmosphere is simulated, the temperature (T50) for converting 50% of propane (HC) is reduced to be lower than 250 DEG C, and more than 85% of NO is oxidized into NO2 (nitrogen dioxide) at the temperature below 200 DEG C; even after long-time high-temperature hydrothermal aging treatment at temperature of 800 DEG C, the original structure of the material can be still maintained, the excellent oxidizing activity is realized, and the use requirements of the DOC of the advanced diesel vehicle are met.

Description

technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalysts, in particular to a core-shell platinum-based catalyst with controllable acidity and its preparation and application. Background technique [0002] Diesel vehicles are widely promoted around the world due to their good fuel economy, excellent power and low carbon dioxide emissions. However, since diesel engines operate under lean conditions, the O 2 The concentration is relatively high, so the three-way catalytic technology cannot effectively purify CO, HC, SO emitted by diesel vehicles 2 and NO x and other pollutants. Generally speaking, diesel engine post-treatment systems adopt a variety of purification technology integration systems, among which diesel oxidation catalyst (DOC) technology is an important component. [0003] DOC is the first diesel engine exhaust post-treatment technology to be applied. This technology is mainly used to treat HC, CO and soluble organ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01D53/94
CPCY02C20/10
Inventor 刘爽吴晓东翁端冉锐
Owner TSINGHUA UNIV
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