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A kind of preparation method of single PD three-way catalyst and product therefrom

A three-way catalyst and the resulting technology are applied in chemical instruments and methods, chemical elements of heterogeneous catalysts, catalysts for physical/chemical processes, etc., which can solve the problems of scarcity of resources and high prices, achieve uniform size distribution, prevent agglomeration, The effect of good resistance to hydrothermal aging

Active Publication Date: 2018-06-26
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the main problem of the three-way catalyst is that the active species noble metals (Pt, Pd, Rh) in the catalyst are scarce and expensive
In addition, many patents have also reported single Pd or double noble metal three-way catalysts supported by CeZr (patent: CN 1778455 A; CN 101433846A; CN 102886261 A; CN 103433057 A; CN 104307517 A), but these reports are all supported by noble metals to prepare catalysts on metal oxides, but there is no report on the preparation of three-way catalysts by loading noble metals on metal hydroxides

Method used

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  • A kind of preparation method of single PD three-way catalyst and product therefrom
  • A kind of preparation method of single PD three-way catalyst and product therefrom
  • A kind of preparation method of single PD three-way catalyst and product therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of 0.5Pd / CZ Catalyst

[0057] 1. Preparation of Ce-Zr hydroxide solid solution

[0058] (1) Weigh 3.7324g Ce(NO 3 ) 3 ·6H 2 O and 4.4802g Zr(NO 3 ) 4 ·3H 2 O, add 40 mL of ultrapure water to form a solution, and stir;

[0059] (2) After stirring evenly, add 1.2 mL of hydrogen peroxide dropwise to the above solution, in which H 2 o 2 The molar ratio to Ce is 1.2:1, and the hydrogen peroxide content is 30 wt.%;

[0060] (3) After adding hydrogen peroxide for 10 min, measure 13.5 mL of ammonia water, and add the above cerium-zirconium salt solution into the ammonia water dropwise, in which NH 3 ·H 2 The molar ratio of O to CeZr is 4.8:1, and the ammonia content is 25 wt.%.

[0061] (4) Continue to stir at room temperature for 22 hours after the above salt solution is precipitated, then age the precipitate suspension in a water bath at 70°C for 3 hours, filter and wash with water until neutral, put the precipitate into a beaker with ethanol and stir i...

Embodiment 2

[0075] The preparation of embodiment 2 0.4Pd / CZ catalyst

[0076] 1. Preparation of Ce-Zr hydroxide solid solution

[0077] Consistent with the steps of Example 1, an ethanol-protected Ce—Zr hydroxide solid solution was obtained.

[0078] 2. Preparation of Pd Colloidal Nanoparticles

[0079] (1) Measure 4.352 mL of Pd(NO 3 ) 2 aqueous solution, then add 0.604 mL of PVP / EG solution, and then add 4 mL of ethanol, and stir well. The molar ratio of Pd to PVP is 1:1, Pd(NO 3 ) 2 The concentration of the aqueous solution is 0.025 mol / L, the concentration of the PVP / EG solution is 0.18 mol / L, and the K value of PVP is 30.

[0080] (2) Measure 15 mL of NaOH / EG solution in a four-neck flask and stir well. Among them, the concentration of NaOH / EG solution is 0.33 mol / L;

[0081] (3) Add the above Pd / PVP / EG solution dropwise to the above NaOH / EG solution, stir, pass N 2 Protect, heat up to 90°C, keep warm and condense and reflux for 1 h. After cooling down, the colloidal nanopa...

Embodiment 3

[0091] Preparation of 0.6 Pd / CZ catalyst

[0092] 1. Preparation of Ce-Zr hydroxide solid solution The steps in Example 1 were consistent to obtain Ce-Zr hydroxide solid solution protected by ethanol.

[0093] 2. Preparation of Pd Colloidal Nanoparticles

[0094] (1) Measure 6.528 mL of Pd(NO 3 ) 2 aqueous solution, then add 0.906 mL of PVP / EG solution, and then add 2 mL of ethanol and stir well. The molar ratio of Pd to PVP is 1:1, Pd(NO 3 ) 2 The concentration of the aqueous solution is 0.025 mol / L, the concentration of the PVP / EG solution is 0.18 mol / L, and the K value of PVP is 30.

[0095] (2) Measure 15 mL of NaOH / EG solution in a four-neck flask and stir well. Among them, the concentration of NaOH / EG solution is 0.33 mol / L;

[0096] (3) Add the above Pd / PVP / EG solution dropwise to the above NaOH / EG solution, stir, pass N 2 Protect, heat up to 90°C, keep warm and condense and reflux for 1 h. After cooling down, the colloidal nanoparticles of Pd preserved in the ...

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Abstract

The invention relates to a Pd-only three-way catalyst preparation method and a product obtained through the method. The method comprises the following steps: preparing a rare earth doped zirconium hydroxide solid solution by adopting a coprecipitation technology, and carrying out sealing stirring preservation on the above obtained product in ethanol; carrying out a colloidal precipitation technology to obtain a solution containing Pd colloid nanoparticles; and adding the solution containing Pd colloid nanoparticles to the ethanol protected rare earth doped zirconium hydroxide solid solution in a dropwise manner, heating the obtained solution to 80-90 DEG C while stirring under the protection of a gas, refluxing the obtained material for 3-4 h, carrying out vacuum drying, roasting the dried material, washing the roasted material with water, and drying the washed material to obtain the catalyst. The catalyst has good hydrothermal ageing resistance, the ignition activity of the catalyst undergoing hydrothermal ageing in air / 10% water vapor at 1000 DEG C for 24 h slightly decreases, and hydrothermal ageing has unobvious influences on the air-fuel ratio work window (narrowing by about 10%); and the catalyst has good hydrothermal stability, and is of great realistic significance to the automobile exhaust three-way catalyst industry.

Description

technical field [0001] The invention relates to a preparation method of a single Pd three-way catalyst and the obtained catalyst, and also relates to the application of the catalyst as a gasoline vehicle exhaust three-way catalyst, belonging to the technical field of gasoline vehicle tail gas catalytic purification. Background technique [0002] With the development of the automobile industry, the environmental pollution caused by automobile exhaust has attracted more and more attention. Gasoline vehicle exhaust mainly contains carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ), etc., the three-way catalyst can convert nitrogen oxides, carbon monoxide and hydrocarbons simultaneously, and is the mainstream technology for controlling automobile exhaust pollution. [0003] In the three-way catalytic technology, the catalyst is the core, mainly composed of three parts: carrier, auxiliary agent and active material. Among them, the active substances used for aut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63
CPCB01J23/002B01J23/63B01J2523/00B01J2523/3712B01J2523/3718B01J2523/3725B01J2523/48B01J2523/824
Inventor 张昭良张志亮李瑞睿辛颖李倩张娜娜
Owner UNIV OF JINAN
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