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Catalyst for achieving low NOx emission of diesel vehicle and production method thereof

A production method and catalyst technology, which are used in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., to achieve the effects of high resistance to hydrothermal aging, promotion of dispersion, and improvement of resistance to water aging.

Pending Publication Date: 2021-11-30
TAIZHOU THREE WAY VEHICLE CATALYTIC CONVERTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above technical scheme, there is still room for improvement in the operating temperature window and hydrothermal stability of the catalyst, and it is urgent to develop a wide-temperature molecular sieve catalyst with better activity.

Method used

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  • Catalyst for achieving low NOx emission of diesel vehicle and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for producing a catalyst for low NOx emissions of diesel vehicles, the steps of which are:

[0034] (1) The metal additive is composed of zirconium nitrate in an amount of 1 wt% of the total weight of the catalyst, barium acetate in an amount of 5 wt% in the total weight of the catalyst and calcium carbonate in an amount of 5 wt% in the total weight of the catalyst.

[0035] Choose a silicon-aluminum ratio of 25-30, an average pore diameter of 10-15nm, and a specific surface area of ​​820-1100g / m 2 The SAPO molecular sieve was used as a carrier, and the carrier was added to an aqueous solution with a metal additive, dried in a water bath at 80°C after impregnation, dried at 110°C for 12 hours, and then calcined in a muffle furnace at 550°C for 3 hours to obtain a primary catalyst.

[0036] (2) The active component is composed of copper nitrate added in an amount of 2wt% by weight of the catalyst, iron nitrate added in an amount of 2wt% by weight of the catalyst...

Embodiment 2

[0039] A method for producing a catalyst for low NOx emissions of diesel vehicles, the steps of which are:

[0040] (1) The metal additive is composed of zirconium nitrate in an amount of 1 wt% of the total weight of the catalyst, barium acetate in an amount of 3 wt% in the total weight of the catalyst and calcium carbonate in an amount of 7 wt% in the total weight of the catalyst.

[0041] Choose a silicon-aluminum ratio of 50-100, an average pore diameter of 15-25nm, and a specific surface area of ​​820-1100g / m 2 The SAPO molecular sieve was used as a carrier. The carrier was added to an aqueous solution with metal additives, dried in a water bath at 80°C after impregnation, dried at 120°C for 16 hours, and then calcined in a muffle furnace at 560°C for 4 hours to obtain a primary catalyst.

[0042] (2) The active component is composed of copper sulfate added in an amount of 3wt% of the total weight of the catalyst, iron sulfate added in an amount of 3wt% of the total weight...

Embodiment 3

[0045] A method for producing a catalyst for low NOx emissions of diesel vehicles, the steps of which are:

[0046] (1) The metal additive is composed of zirconium nitrate in an amount of 1 wt% of the total weight of the catalyst, barium acetate in an amount of 3 wt% in the total weight of the catalyst and calcium carbonate in an amount of 7 wt% in the total weight of the catalyst.

[0047] Choose a silicon-aluminum ratio of 20-25, an average pore diameter of 5-10nm, and a specific surface area of ​​820-1100g / m 2 The SAPO molecular sieve was used as a carrier, and the carrier was added to an aqueous solution with metal additives, dried in a water bath at 80°C after impregnation, then dried at 120°C for 12 hours, and then calcined in a muffle furnace at 560°C for 4 hours to obtain a primary catalyst.

[0048] (2) active component is the copper sulfate of catalyzer gross weight 0.5wt% by addition, the addition is the ferric sulfate of catalyzer gross weight 1wt%, the palladium c...

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Abstract

The invention belongs to the field of chemical engineering, and relates to a production method of a catalyst for achieving low NOx emission of a diesel vehicle, which comprises the following steps of: (1) adding a CHA type small-pore molecular sieve as a carrier into an aqueous solution of a metal additive, dipping, drying in a water bath, drying, and roasting to obtain a primary catalyst; and (2) dissolving an active component in a polyol guiding agent, adding the primary catalyst into the polyol guiding agent with the active component, dipping, cleaning, drying and roasting to obtain a finished catalyst. A catalyst for achieving low NOx emission of a diesel vehicle is produced according to the method. According to the catalyst provided by the invention, the polyol guiding agent is added in the loading process, and the dispersity of the active component is improved, so that the activity and the thermal stability of the finished catalyst are improved, and the operation temperature window of the catalyst is widened.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a molecular sieve catalyst, in particular to a catalyst for low NOx emission of diesel vehicles and a production method thereof. Background technique [0002] NOx, that is, nitrogen oxides, includes several forms such as nitrous oxide, nitrogen monoxide, nitrogen dioxide and dinitrogen trioxide. As the main means of transportation and transportation, diesel vehicles have the characteristics of strong power and good fuel economy. The main exhaust pollutants are soot and NOx, which are important components of PM2.5, which combine with moisture in the atmosphere to produce a large amount of acid rain and photochemical smog. [0003] With the increasingly stringent global environmental protection regulations, a single engine internal purification technology and the performance of traditional NOx emission catalysts have been unable to meet emission standards and service life requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/76B01J29/85B01J37/02B01J37/08B01J35/10B01D53/94
CPCB01J29/7415B01J29/743B01J29/7615B01J29/763B01J29/85B01J37/0201B01J37/082B01J37/0018B01D53/9413B01J2229/186B01D2257/404B01D2258/01B01J35/647
Inventor 王六杞
Owner TAIZHOU THREE WAY VEHICLE CATALYTIC CONVERTER CO LTD
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