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Preparation method of three-way catalyst for single-coated gasoline car

A three-way catalyst, gasoline vehicle technology, applied in chemical instruments and methods, physical/chemical process catalysts, mechanical equipment, etc., can solve problems such as reduction in reduction performance, and achieve the effect of inhibiting growth and good durability.

Inactive Publication Date: 2019-08-23
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing three-way catalysts on the market are based on the stoichiometric ratio or catalysts developed under the condition of partial rich combustion. Under the condition of lean combustion (A / F greater than 14.7), NO X Significant drop in restore performance

Method used

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  • Preparation method of three-way catalyst for single-coated gasoline car

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of a single-coated three-way catalyst for gasoline vehicles, comprising the steps of:

[0044] ZrP 2 o 7 @La-Al 2 o 3 Material preparation:

[0045] (1) Synthesis of ZrP 2 o 7 @La-Al 2 o 3 Weighing of required materials: weigh ZrO(NO 3 ) 2 、H 3 PO 4 、La-Al 2 o 3 materials, among them, ZrO(NO 3 ) 2 and H 3 PO 4 respectively dissolved in a certain amount of deionized water;

[0046] (2), ZrP 2 o 7 Synthesis of materials: ZrO(NO 3 ) 2 The solution was slowly added to H 3 PO 4 solution, stirred for 60 minutes;

[0047] (3), core-shell structure ZrP 2 o 7 @La-Al 2 o 3 The synthesis of: the La-Al in step (1) 2 o 3 Material is added in the step (2);

[0048] (4), hydrothermal treatment: take the material of step (3) and transfer it to the reactor, and heat it in a water bath at 80° C. for 5 hours;

[0049] (5), washing: the material in step (4) is washed 3 times with deionized water;

[0050] (6) Material drying and roastin...

Embodiment 2

[0067] A preparation method of a single-coated three-way catalyst for gasoline vehicles, comprising the steps of:

[0068] ZrP 2 o 7 @La-Al 2 o 3 Material preparation:

[0069] (1) Synthesis of ZrP 2 o 7 @La-Al 2 o 3 Weighing of required materials: weigh ZrO(NO 3 ) 2 、H 3 PO 4 、La-Al 2 o 3 materials, among them, ZrO(NO 3 ) 2 and H 3 PO 4 respectively dissolved in a certain amount of deionized water;

[0070] (2), ZrP 2 o 7 Synthesis of materials: ZrO(NO 3 ) 2 The solution was slowly added to H 3 PO 4 solution, stirred for 120 minutes;

[0071] (3), core-shell structure ZrP 2 o 7 @La-Al 2 o3 The synthesis of: the La-Al in step (1) 2 o 3 Material is added in the step (2);

[0072] (4), hydrothermal treatment: take the material of step (3) and transfer it to the reactor, and heat it in a water bath at 90° C. for 12 hours;

[0073] (5), washing: the material in step (4) is washed 3 times with deionized water;

[0074] (6) Material drying and roastin...

Embodiment 3

[0091] A preparation method of a single-coated three-way catalyst for gasoline vehicles, comprising the steps of:

[0092] ZrP 2 o 7 @La-Al 2 o 3 Material preparation:

[0093] (1) Synthesis of ZrP 2 o 7 @La-Al 2 o 3 Weighing of required materials: Weigh ZrO(NO 3 ) 2 、H 3 PO 4 、La-Al 2 o 3 materials, among them, ZrO(NO 3 ) 2 and H 3 PO 4 respectively dissolved in a certain amount of deionized water;

[0094] (2), ZrP 2 o 7 Synthesis of materials: ZrO(NO 3 ) 2 The solution was slowly added to H 3 PO 4 In the solution, stir strongly for 240 minutes;

[0095] (3), core-shell structure ZrP 2 o 7 @La-Al 2 o 3 The synthesis of: the La-Al in step (1) 2 o 3 Material is added in the step (2);

[0096] (4), hydrothermal treatment: take the material of step (3) and transfer it to the reactor, and heat it in a water bath at 85° C. for 24 hours;

[0097] (5), washing: the material in step (4) is washed 3 times with deionized water;

[0098] (6) Material dry...

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Abstract

The invention relates to a preparation method of a three-way catalyst for a single-coated gasoline car. The preparation method comprises the following steps: preparing a ZrP2O7@La-Al2O3 material; preparing Rh / ZrP2O7@La-Al2O3; preparing a Pd / Ce-Zr solid solution powder; treating the Rh / ZrP2O7@La-Al2O3 powder and the Pd / Ce-Zr solid solution powder; preparing slurry; carrying out ball milling on theslurry; measuring the solid content; coating a slurry coating; drying a catalyst; and roasting the catalyst. By using the preparation method, the low-temperature ignition activity of HC, CO and NOx under the condition of lean burn is improved, and the durability of the catalyst is better. Due to the impregnation of an auxiliary and a precious metal Pd solution on the Ce-Zr solid solution powder, the enlargement of precious metal Pd particles at high temperature can be favorably inhibited, and meanwhile, the oxygen storage and release rates of OSC are accelerated.

Description

technical field [0001] The invention relates to a preparation method of a single-coated gasoline vehicle three-way catalyst, which belongs to the technical field of preparation of gasoline vehicle catalysts. Background technique [0002] Vehicle exhaust pollution has become one of the main sources of air pollution. Most nitrogen oxides (NO X ), CO and hydrocarbons (HC) are all produced by vehicle exhaust. NO X , CO, HC, and PM not only cause damage to the human body but also destroy the living environment of human beings under certain conditions. [0003] Gasoline vehicle three-way catalyst (TWC) is used to oxidize CO, HC and NO in gasoline vehicle exhaust X The reduction of the coating is mainly composed of alumina, Ce-Zr solid solution, additives and active precious metal components. The precious metal is the key component of the three-way catalyst for gasoline vehicles. For gasoline vehicle TWC catalyst, it is to use TWC catalyst to reduce HC, CO and NO in gasoline e...

Claims

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Application Information

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IPC IPC(8): B01J27/185F01N3/10
CPCB01J27/1856F01N3/101F01N2570/10F01N2570/12F01N2570/14B01J35/396Y02A50/20
Inventor 杨金贾莉伟岳军蒋颉孙亮丁薇
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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