Modified Cu-SSZ-13 molecular sieves as well as preparation method and application thereof

A cu-ssz-13, molecular sieve technology, applied in the field of molecular sieves, can solve the problem of low SCR activity, reduce the generation of by-products, avoid secondary pollution, and achieve the effect of high crystallinity

Active Publication Date: 2019-08-02
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at 150°C and below, the SCR activity of Cu-SSZ-13 is still low, the conversion rate of NO can only reach 20~40%, and the selectivity of N2 is generally lower than 80%.

Method used

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  • Modified Cu-SSZ-13 molecular sieves as well as preparation method and application thereof
  • Modified Cu-SSZ-13 molecular sieves as well as preparation method and application thereof
  • Modified Cu-SSZ-13 molecular sieves as well as preparation method and application thereof

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preparation example Construction

[0041] The invention provides a kind of preparation method of modified Cu-SSZ-13 molecular sieve, comprising the following steps:

[0042] 1) Mix aluminum source, alkali metal hydroxide, templating agent, silicon source and water to obtain initial sol;

[0043] 2) Calcining the initial sol after hydrothermal crystallization to obtain M-SSZ-13 molecular sieve, and the M is an alkali metal;

[0044] 3) Carrying out the ion exchange reaction between the M-SSZ-13 molecular sieve and the ammonium salt, and then roasting to obtain the H-SSZ-13 molecular sieve;

[0045] 4) The H-SSZ-13 molecular sieve is subjected to ion exchange reaction with divalent copper salt and then calcined to obtain a modified Cu-SSZ-13 molecular sieve.

[0046] The invention mixes aluminum source, alkali metal hydroxide, template agent, silicon source and water to obtain initial sol. In the present invention, the aluminum source is preferably one or more of aluminum sulfate, aluminum nitrate, aluminum hyd...

Embodiment 1

[0065] 1) Dissolve 0.432g lithium hydroxide in 44ml deionized water, then add 1.998g aluminum sulfate octadecahydrate to the above solution and stir for 3-5 minutes, continue to add 20.256g template agent TMAdaOH (25%) to the solution, stir After the solution was clear and transparent, 14.580g of silica sol JN25 was added as a silicon source, and the initial sol was obtained after stirring for 2 hours. At this time, the molar ratio of aluminum element, alkali metal hydroxide, template agent, silicon element in the silicon source and water is 0.1:0.3:0.4:1:66.

[0066] 2) The obtained initial sol was transferred to a polytetrafluoroethylene-lined stainless steel reactor and crystallized at 150 °C for 6 days. After the reaction is completed, cool to room temperature, filter, fully wash with deionized water and dry, and then bake at 550° C. for 6 hours to remove the template agent to obtain Li-SSZ-13 molecular sieve.

[0067] 3) Take 2g of the above-mentioned Li-SSZ-13 molecular...

Embodiment 2

[0072] 1) Dissolve 0.722g of sodium hydroxide in 44ml of deionized water, then add 0.246g of sodium metaaluminate into the above solution and stir for 3-5 minutes. Continue to add 20.281g template agent TMAdaOH (25%) to the solution, stir until the solution is clear and transparent, add 14.838g silica sol as a silicon source, and continue stirring for 2h to obtain the initial sol. At this time, the molar ratio of aluminum element, alkali metal hydroxide, template agent, silicon element in the silicon source and water is 0.1:0.3:0.4:1:66.

[0073] 2) The obtained initial sol was transferred to a polytetrafluoroethylene-lined stainless steel reactor for crystallization at 150 °C for 6 days. After the reaction is completed, cool to room temperature, filter, fully wash with deionized water and dry, and then bake at 550° C. for 6 hours to remove the template agent to obtain Na-SSZ-13 molecular sieve.

[0074] 3) Take 2g of the above-mentioned Na-SSZ-13 molecular sieve and add it t...

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Abstract

The invention discloses modified Cu-SSZ-13 molecular sieves as well as a preparation method and the application thereof. The preparation method comprises the following steps: mixing an aluminum source, alkali metal hydroxides, a template agent, a silicon source and water to obtain initial sol; performing hydrothermal crystallization on the initial sol and then roasting to obtain M-SSZ-13 molecularsieves; performing ion exchange reaction between the M-SSZ-13 molecular sieves and ammonium salt and then roasting to obtain H-SSZ-13 molecular sieves; and performing ion exchange reaction with divalent copper salt and then roasting to obtain the modified Cu-SSZ-13 molecular sieves. The molecular sieves with different morphologies are synthesized in situ through adding the different alkali metalhydroxides. The modified Cu-SSZ-13 molecular sieves as well as the preparation method and the application thereof disclosed by the invention have the benefits that the different alkali metal hydroxides are directly added in the synthesis process, and the morphologies and the grain sizes of the molecular sieves are changed while alkali metal ions are introduced; each of the obtained modified Cu-SSZ-13 molecular sieves is high in degree of crystallinity and high in pure phase, and shows higher low temperature activity and nitrogen selectivity.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a modified Cu-SSZ-13 molecular sieve and its preparation method and application. Background technique [0002] Automobiles are mainly divided into gasoline vehicles, diesel vehicles and alternative fuel vehicles. Among them, gasoline vehicles are the most widely used. With the increasing shortage of resources such as global fossil fuels and the intensification of environmental pollution, diesel vehicles are due to their good fuel economy, strong power, Low room temperature gas emissions, high safety, and long life have gradually attracted attention in high-power vehicles (such as large passenger cars and large trucks). Diesel vehicles adopt lean combustion technology, although HC, CO, CO 2 Low emissions, but cause nitrogen oxides NO in the exhaust x The emission is relatively high, which will become an important factor seriously restricting the popularization of diesel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01D53/86B01D53/56
CPCC01B39/04B01D53/8628C01P2004/62C01P2004/61C01P2004/03C01P2002/72Y02C20/10Y02A50/20
Inventor 樊卫斌吕文婷王建国董梅秦张峰李俊汾
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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