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Bimetal modified catalyst as well as preparation method and application thereof

A bimetallic and catalyst technology, applied in the field of catalysis, can solve the problems of reduced catalyst activity, reduced catalyst high-temperature hydrothermal stability, and low activity, and achieve the effects of improving low-temperature water resistance, increasing post-treatment difficulty, and high N2 selectivity

Pending Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have shown that the Cu 2+ The introduction of SAPO-34 molecular sieve can improve the stability of SAPO-34 framework (including structural stability and acidity); Cu 2+ The stability of itself is closely related to the stability of the SAPO-34 framework, but there are differences; when the degree of ion exchange is low, Cu 2+ The stability of itself and the stability of the skeleton are positively correlated; when the degree of ion exchange is high (such as 3.67wt% copper content), in the process of low temperature water treatment, Cu 2+ will migrate, become unstable, and tend to coalesce, resulting in isolated Cu 2+ content reduction
Moreover, if the content of Cu in the catalyst is too high, the high-temperature hydrothermal stability of the catalyst will be reduced. If the amount of Cu is too high, Cu will 2+ Ions are more likely to migrate and agglomerate to form less active Cu x o y , which greatly reduces the activity of the catalyst
Chinese patent CN107661776A discloses a method for preparing SAPO molecular sieves containing copper and silver bimetal and its application, CuAg with medium Ag content 2.25 -SAPO-34 in NH 3 -The low-temperature hydrothermal stability is better than that of Cu-SAPO-34 in the SCR reaction, but the price of silver is relatively expensive, which limits its practical application

Method used

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  • Bimetal modified catalyst as well as preparation method and application thereof
  • Bimetal modified catalyst as well as preparation method and application thereof
  • Bimetal modified catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 1.01gCu(NO 3 ) 2 ·3H 2 O and 1.34gZn(NO 3 ) 2 ·6H 2 O is placed in a beaker, 15ml of deionized water is added to dissolve it, and 2.4g of tetraethylenepentamine (TEPA) is added under stirring to obtain a dark blue Cu-Zn-TEPA mixed solution A1, wherein the mol ratio of copper to zinc is 1:1.

[0045] Weigh 8.3g (the mass fraction of phosphoric acid is 85%) of phosphoric acid and place it in a beaker, add 35mL of water and stir, add 6.18g of pseudo-boehmite under heating at 80°C and continue stirring for 2 hours, then add 4.545g of triethyl Amine, 18.9g tetraethylammonium hydroxide aqueous solution (the mass fraction of tetraethylammonium hydroxide is 35%), 1.64g fumed silica obtain initial sol B1, and the silicon-aluminum atomic ratio in the initial gel wherein is 0.3;

[0046] Add the Cu-Zn-TEPA solution A1 into the initial sol B1, continue heating and stirring at 80°C for 2 hours, then cool down to room temperature and stir for 15 hours to obtain the initia...

Embodiment 2

[0049] Weigh 1.01gCu(NO 3 ) 2 ·3H 2 O and 1.34gZn(NO 3 ) 2 ·6H 2 O is placed in a beaker, 15ml of deionized water is added to dissolve it, and 1.7g of tetraethylenepentamine (TEPA) is added under stirring conditions to obtain a dark blue Cu-Zn-TEPA mixed solution A2, wherein the molar ratio of copper to zinc is 1:1.

[0050] The initial sol used in this example is B1;

[0051] Add the Cu-Zn-TEPA solution A2 to the initial sol B1, continue heating and stirring at 80° C. for 2 hours, then cool down to room temperature and stir for 15 hours to obtain the initial mixed gel C2.

[0052] The gel C2 was transferred to a reaction kettle with a polytetrafluoroethylene liner, and the temperature of the reaction kettle was raised to 200° C. for 24 hours for crystallization. After the crystallization was completed, cool to room temperature, and then filter and wash the sample. Dry the washed molecular sieve filter cake in a blast drying oven at 80°C for 12 hours, then put the drie...

Embodiment 3

[0054] Weigh 1.01gCu(NO 3 ) 2 ·3H 2 O and 0.67gZn(NO 3 ) 2 ·6H 2 O is placed in a beaker, 15ml of deionized water is added to dissolve it, and 1.7g of tetraethylenepentamine (TEPA) is added under stirring conditions to obtain a dark blue Cu-Zn-TEPA mixed solution A3, wherein the molar ratio of copper to zinc is It is 2:1.

[0055] The initial sol used in this example is B1;

[0056] Add the Cu-Zn-TEPA solution A3 to the initial sol B1, continue heating and stirring at 80°C for 2 hours, then cool down to room temperature and stir for 15 hours to obtain the initial mixed gel C3.

[0057] The gel C3 was transferred to a reaction kettle with a polytetrafluoroethylene liner, and the temperature of the reaction kettle was raised to 210° C. for 24 hours for crystallization after filling the kettle. After the crystallization was completed, cool to room temperature, and then filter and wash the sample. Dry the washed molecular sieve filter cake in a blast drying oven at 80°C fo...

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Abstract

The invention discloses a bimetallic modified catalyst as well as a preparation method and application thereof. The bimetallic modified catalyst comprises a bimetallically modified molecular sieve, wherein the bimetallically modified molecular sieve comprises a zeolite molecular sieve and metal elements, and the metal elements are loaded on the zeolite molecular sieve; the metal elements comprise a copper element and a zinc element; and the zeolite molecular sieve is an SAPO-34 molecular sieve. The catalyst provided by the invention has good denitration activity, high N2 selectivity and improved low-temperature and high-temperature hydrothermal stability in a wide temperature window between 200 DEG C and 550 DEG C, and is very suitable for treating nitric oxide in tail gas of a mobile source diesel engine.

Description

technical field [0001] The application relates to a bimetallic modified catalyst and its preparation method and application, belonging to the field of catalysis. Background technique [0002] In recent years, Cu-CHA molecular sieve catalytic materials have been used in the NH denitrification of diesel vehicle exhaust. 3 -The application of SCR catalytic reaction has been paid more and more attention. Compared with mesoporous molecular sieve ZSM-5 or macroporous molecular sieve Beta, small-pore CHA-type molecular sieve catalysts containing transition metal Cu showed better SCR activity, wider temperature window, higher nitrogen selectivity, excellent Anti-high temperature hydrothermal aging performance and anti-hydrocarbon poisoning performance. The currently studied Cu-CHA molecular sieves mainly include Cu-SSZ-13 and Cu-SAPO-34 molecular sieve catalytic systems. Cu-SSZ-13 has been commercially applied. Compared with Cu-SSZ-13, Cu-SAPO-34 has better high temperature hydro...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01D53/94F01N3/10
CPCB01J29/85F01N3/10B01D53/9413B01J2229/186F01N2570/14F01N2570/18B01D2251/2062
Inventor 程昊王树东张学彬倪长军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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