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Preparation method of molecular sieve catalyst, catalyst and application thereof

A molecular sieve and catalyst technology, applied in the field of preparation of molecular sieve catalysts, can solve the problem of low metal loading efficiency

Pending Publication Date: 2021-11-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a preparation method of a molecular sieve catalyst, a catalyst and its application, so as to solve the problem of low metal loading efficiency in the prior art of using a liquid ion exchange method to load metals on molecular sieves

Method used

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  • Preparation method of molecular sieve catalyst, catalyst and application thereof
  • Preparation method of molecular sieve catalyst, catalyst and application thereof
  • Preparation method of molecular sieve catalyst, catalyst and application thereof

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preparation example Construction

[0023] In a typical implementation of the present application, a method for preparing a molecular sieve catalyst is provided, the preparation method comprising: step S1, mixing the molecular sieve carrier with the precursor of the metal active component to obtain a dry mixture; step S2 , performing high-energy ball milling on the dry mixture and balls in a ball mill to obtain a ball-milled system; and step S3, roasting the ball-milled system to obtain a molecular sieve catalyst, wherein the speed of the high-energy ball mill is 100-2000r / min.

[0024] In this application, firstly, the molecular sieve is directly mixed with the precursor of the metal active component to obtain a dry blend. Then, the high-energy ball milling method is used to refine the crystal grains of the precursor of the metal active component and the molecular sieve, improve the distribution uniformity of the precursor of the metal active component and the molecular sieve, and enhance the bonding strength of...

Embodiment 1

[0041] Place 2 g of SAPO-34 molecular sieve and 0.19 g of cupric chloride dihydrate into an agate mortar and mix thoroughly to obtain a dry mixture; mill the dry mixture in a ball mill for 30 minutes to obtain a milled system, wherein the ball The particle size is 6mm, the weight ratio of the balls in the ball mill to the SAPO-34 molecular sieve carrier is 25, and the speed of the ball mill is 1000r / min; then the ball milled system is put into the muffle furnace, and the air atmosphere is 800°C for 4h Calcined to obtain a copper-based molecular sieve catalyst, denoted as Cu / SAPO-34. The copper-based molecular sieve catalyst includes a SAPO-34 molecular sieve carrier and copper ions, wherein the copper ion is 3.5 wt% of the SAPO-34 molecular sieve carrier. In addition, SAPO-34 molecular sieve was provided by Nanjing Xianfeng Nano Material Technology Co., Ltd. (the same below).

Embodiment 2

[0043] Place 2 g of SAPO-34 molecular sieve, 0.19 g of copper chloride dihydrate, and 0.25 g of ferrous chloride tetrahydrate into an agate mortar and mix thoroughly to obtain a dry mixture; mill the dry mixture in a ball mill for 30 minutes The system after ball milling is obtained, wherein the particle diameter of the ball mill is 6mm, the weight ratio of the ball mill in the ball mill to the SAPO-34 molecular sieve carrier is 25, and the rotating speed of the ball mill is 1000r / min; then the system after ball milling is put into the muffle furnace , Roasted at 800°C in an air atmosphere for 4h to obtain an iron-based molecular sieve catalyst, which is denoted as Cu-Fe / SAPO-34. The molecular sieve catalyst comprises a SAPO-34 molecular sieve carrier, copper ions and iron ions, wherein the copper ion is 3.48wt% of the SAPO-34 molecular sieve carrier, and the iron ion is 3.47wt% of the SAPO-34 molecular sieve carrier.

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Abstract

The invention provides a preparation method of a molecular sieve catalyst, the catalyst and application of the catalyst. The preparation method comprises the following steps of: S1, mixing a molecular sieve carrier with a precursor of a metal active component to obtain a dry mixture; S2, performing high-energy ball milling on the dry mixture and grinding balls in a ball mill to obtain a ball-milled system; and S3, roasting the ball-milled system to obtain the molecular sieve catalyst, the rotating speed of the ball mill for high-energy ball milling being 100-2000 r / min. According to the process, the preparation process of the molecular sieve catalyst loaded with the metal active component is simplified; and the use of substances other than the metal active component and the molecular sieve during metal active component loading modification in the molecular sieve catalyst is reduced. The molecular sieve catalyst prepared through the method has the advantages of being low in cost, simple and convenient in process, high in activity and the like, and the actual requirement for efficient catalytic purification treatment of NOx of a motor vehicle can be fully met.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a molecular sieve catalyst, the catalyst and its application. Background technique [0002] Exhaust gases from motor vehicles contain a large amount of nitrogen oxides (NO x ), bringing great harm to human life and the natural environment. In terms of harm to the human body: for example, long-term contact with nitrogen oxides will damage the human respiratory tract, skin, etc.; in severe cases, it will also damage the central nervous system, and even cause death; impact on the ecological environment: for example, nitrogen oxides are induced photochemical It is an important precursor of smog and acid rain and acid mist; it is closely related to ozone concentration and photochemical pollution: it may also destroy the ozone layer and cause secondary pollution. [0003] After nitrogen oxides were included in the environmental statistics system, the measure...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01J29/46B01D53/94F01N3/28B01D53/56
CPCB01J29/85B01J29/46B01D53/9413F01N3/2803B01J2229/186Y02A50/20
Inventor 王兴华关丹宫兆波赵增义周新艳于文芳依力哈木·尔西丁
Owner PETROCHINA CO LTD
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