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Cu-SSZ-13 molecular sieve based catalyst adopting core-shell structure as well as preparation and application of catalyst

A cu-ssz-13, core-shell structure technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the limitations of the practical application of Cu-SSZ-13 molecular sieve catalysts and low low-temperature catalytic activity. , the reduction of catalytic activity, etc., to achieve the effect of improving hydrothermal stability and anti-hydrocarbon poisoning ability, high activity, and broadening the working temperature window

Inactive Publication Date: 2016-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, Cu-SSZ-13 molecular sieve catalysts still have the following disadvantages: (1) The low-temperature catalytic activity is not high; (2) After high-temperature hydrothermal aging, the catalytic activity decreases significantly; (3) It is prone to hydrocarbon poisoning
However, there is no relevant research to solve the above problems, which limits the better practical application of Cu-SSZ-13 molecular sieve catalysts.

Method used

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  • Cu-SSZ-13 molecular sieve based catalyst adopting core-shell structure as well as preparation and application of catalyst
  • Cu-SSZ-13 molecular sieve based catalyst adopting core-shell structure as well as preparation and application of catalyst
  • Cu-SSZ-13 molecular sieve based catalyst adopting core-shell structure as well as preparation and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 1 g of SSZ-13 molecular sieve into 100 mL of 0.1 mol / L NaOH solution, and treat it at 35°C for 2 hours, at this time, mesoporous SSZ-13 molecular sieve can be obtained.

[0030] (2) Add deionized water and 100mL ethanol solution containing 2g P123 to the above suspension, and adjust its pH value to about 5 with acid solution.

[0031] (3) React the above solution at 35° C. for 48 hours, and then raise it to 70° C. for 24 hours to obtain a molecular sieve carrier with a core-shell structure. figure 1 is its electron micrograph, by figure 1 It can be seen that it is SSZ-13 molecular sieve (Meso-SSZ-13@MAS) with core-shell structure.

[0032] (4) The obtained product was washed alternately with deionized water and ethanol solution respectively, then dried at 100° C. for 12 hours, and then calcined at 550° C. for 6 hours.

[0033](5) The corresponding catalyst is prepared by an aqueous solution ion exchange method. Add 1 g of core-shell structure SSZ-13 molecular...

Embodiment 2

[0036] (1) Add 1 g of SSZ-13 molecular sieve into 50 mL of 0.2 mol / L NaOH solution, and treat it at 35°C for 1 hour, at this time, the mesoporous SSZ-13 molecular sieve can be obtained.

[0037] (2) Add deionized water and 150mL ethanol solution containing 3g P123 to the above suspension, and adjust its pH value to about 5.5 with acid solution.

[0038] (3) React the above solution at 35° C. for 48 hours, and then raise it to 70° C. for 24 hours to obtain a molecular sieve carrier with a core-shell structure.

[0039] (4) The obtained product was washed alternately with deionized water and ethanol solution respectively, then dried at 100° C. for 12 hours, and then calcined at 550° C. for 6 hours.

[0040] (5) The corresponding catalyst is prepared by an aqueous solution ion exchange method. Add 1 g of core-shell structure SSZ-13 molecular sieve to 100 mL of 0.1 mol / L ammonium nitrate solution, stir at 80 ° C for 12 h, then filter and wash with deionized water to obtain ammoni...

Embodiment 3

[0042] (1) Add 1 g of SSZ-13 molecular sieve into 20 mL of 0.3 mol / L NaOH solution, and treat it at 35° C. for 0.5 h, at which point mesoporous SSZ-13 molecular sieve can be obtained.

[0043] (2) Add deionized water and ethanol solution containing CTAB to the above suspension, and adjust its pH value to about 5 with acid solution.

[0044] (3) React the above solution at 35° C. for 48 hours, and then raise it to 70° C. for 24 hours to obtain a molecular sieve carrier with a core-shell structure.

[0045] (4) The obtained product was washed alternately with deionized water and ethanol solution respectively, then dried at 100° C. for 12 hours, and then calcined at 550° C. for 6 hours.

[0046] (5) The corresponding catalyst is prepared by a solid-state ion exchange method. Add the core-shell structure SSZ-13 molecular sieve to the ammonium nitrate solution, use 100mL of 0.01mol / L ammonium nitrate solution for 1g molecular sieve, stir at 80°C for 12h, then filter and wash with ...

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Abstract

The invention relates to a Cu-SSZ-13 molecular sieve based catalyst adopting a core-shell structure as well as preparation and an application of the catalyst and belongs to the technical field of purification treatment of nitric oxide in the technical field of environmental protection. An SSZ-13 molecular sieve is taken as a carrier and subjected to desilicication treatment with NaOH solutions with different concentrations, and a mesoporous structure is introduced to the molecular sieve; then, a mesoporous template agent is added to a turbid liquid containing the mesoporous molecular sieve, and an aluminosilicate shell adopting a mesoporous structure is self-assembled on the surface of the molecular sieve; finally, the corresponding catalyst is prepared with an ion exchange method. The working temperature window of the catalyst is widened, the hydrothermal stability and the hydrocarbon toxicosis resisting capability of the catalyst are improved, and the catalyst has good actual application prospect; in a motor vehicle exhaust component simulation experiment, the removal efficiency of NOx is 90% or higher; the removal efficiency of NOx is 80% or higher after the catalyst is subjected to hydrothermal ageing for 24 h at the temperature of 750 DEG C; ; the removal efficiency of NOx is 80% or higher in the presence of propylene.

Description

technical field [0001] The invention belongs to the purification treatment of nitrogen oxides in the technical field of environmental protection, and relates to the purification of nitrogen oxides in stationary source flue gas and diesel vehicle exhaust, in particular to a Cu-SSZ-13 molecular sieve catalyst with a core-shell structure and its preparation and application. Background technique [0002] At present, the selective catalytic reduction of nitrogen oxides (NH 3 -SCR) is the most promising way to eliminate NO x One of the latest technologies, the core of which is the SCR catalyst. Among them, transition metal (Cu, Fe) exchanged molecular sieve catalysts are the hotspots of research. In recent years, Cu-exchanged small-pore molecular sieve catalysts have attracted more and more attention from researchers, such as Cu-SAPO-34 and Cu-SSZ-13. Compared with Cu-ZSM-5, Cu-Y and Cu-beta molecular sieve catalysts, Cu-SSZ-13 exhibited better catalytic activity, N 2 Selectiv...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/86B01D53/94B01D53/56
CPCB01J29/763B01D53/8628B01D53/9413B01D2255/50B01D2258/012B01D2258/0283B01J2229/186
Inventor 李俊华张涛邱枫
Owner TSINGHUA UNIV
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