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SSZ-13@Silicalite-1 molecular sieve of composite structure, and preparation method and application of SSZ-13@Silicalite-1 molecular sieve of composite structure

A composite structure and molecular sieve technology, which is applied in separation methods, molecular sieve catalysts, including molecular sieve catalysts, etc., can solve the problems of increasing the production cost of Cu-SSZ-13 molecular sieves, unfavorable large-scale industrial application, complicated operation steps, etc., and achieve excellent catalytic performance Performance, good thermodynamic stability, effect of good catalytic performance

Active Publication Date: 2019-03-01
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the above method, although the hydrothermal stability of the SSZ-13 molecular sieve can be improved within a certain range, the improvement range is not large, and the operation steps involved are complicated, and the production cost of the Cu-SSZ-13 molecular sieve is increased, which is not conducive to Large-scale industrial application

Method used

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  • SSZ-13@Silicalite-1 molecular sieve of composite structure, and preparation method and application of SSZ-13@Silicalite-1 molecular sieve of composite structure
  • SSZ-13@Silicalite-1 molecular sieve of composite structure, and preparation method and application of SSZ-13@Silicalite-1 molecular sieve of composite structure
  • SSZ-13@Silicalite-1 molecular sieve of composite structure, and preparation method and application of SSZ-13@Silicalite-1 molecular sieve of composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 SSZ-13@Silicalite-1 molecular sieve

[0045] The preparation steps are as follows:

[0046] (1) Add 22.5 grams of 25% N,N,N-trimethylamantadine hydroxide into 23.5 grams of deionized water, mix well, then add 0.75 grams of sodium hydroxide, stir until fully dissolved, and then 0.80 grams of aluminum hydroxide, fully mixed, 10 grams of solid silica gel was added thereto, and fully stirred. The above mixture was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a 160 °C oven for crystallization for 72 hours, taken out, quenched, and the crystallized product was subjected to solid-liquid separation, washing and drying to obtain SSZ- 13 molecular sieve raw powder.

[0047] (2) Add 13.5 grams of 25% tetrapropylammonium hydroxide to 45.4 grams of deionized water, mix well, then add 2.0 grams of solid silica gel to it, then add 10 grams of SSZ-13 molecular sieve former powder synthesized as above Among them, stir well. ...

Embodiment 2

[0049] Example 2 SSZ-13@Silicalite-1 molecular sieve

[0050] The preparation steps are as follows:

[0051] (1) Add 26.0 grams of 25% N,N,N-trimethylamantadine hydroxide into 20.0 grams of deionized water, mix well, then add 0.60 grams of sodium hydroxide, stir until fully dissolved, and then 1.05 grams of aluminum hydroxide, fully mixed, 10 grams of solid silica gel was added thereto, and fully stirred. The above mixture was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a 160 °C oven for crystallization for 72 hours, taken out, quenched, and the crystallized product was subjected to solid-liquid separation, washing and drying to obtain SSZ- 13 molecular sieve raw powder.

[0052] (2) Add 13.5 grams of 25% tetrapropylammonium hydroxide to 45.4 grams of deionized water, mix well, then add 2.0 grams of precipitated white carbon black, and then 10 grams of SSZ-13 molecular sieves synthesized as above Add the original powder to ...

Embodiment 3

[0053] Example 3 SSZ-13@Silicalite-1 molecular sieve

[0054] The preparation steps are as follows:

[0055] (1) Add 26.0 grams of 25% N,N,N-trimethylamantadine hydroxide into 20.5 grams of deionized water, mix well, then add 0.60 grams of sodium hydroxide, stir until fully dissolved, and then 1.30 grams of aluminum hydroxide, mixed thoroughly, 10 grams of solid silica gel was added thereto, and fully stirred. The above mixture was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, placed in a 160 °C oven for crystallization for 72 hours, taken out, quenched, and the crystallized product was subjected to solid-liquid separation, washing and drying to obtain SSZ- 13 molecular sieve raw powder.

[0056] (2) Add 5.2 grams of tetrapropylammonium bromide into 25.6 grams of deionized water, mix well, then add 2.0 grams of solid silica gel to it, then add 0.23 grams of sodium hydroxide to it, then add 10 grams of the above-mentioned synthesized Ad...

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Abstract

The invention relates to an SSZ-13@Silicalite-1 molecular sieve of a composite structure and a preparation method and application of the SSZ-13@Silicalite-1 molecular sieve of the composite structure.The SSZ-13@Silicalite-1 molecular sieve comprises a periphery area and a center area, wherein silicon species and aluminium species of the center area are distributed evenly, and the periphery area is only provided with silicon species without aluminium species; preferably, calculated in terms of XRD characteristic peak area, the ratio of the center area to the periphery area is (4-9) to 1. The obtained SSZ-13@Silicalite-1 molecular sieve of the composite structure has wide crystallization phase area, the hydrothermal stability is fundamentally improved, Cu species are introduced into the areas, the obtained Cu- SSZ-13@Silicalite-1 molecular sieve has excellent catalytic performance in a NH2-SCR reaction, and particularly after hydro-thermal treatment, good catalytic performance is stillkept. The synthesis method provided by the invention has the advantages of being simple and reliable, and easy to implement.

Description

technical field [0001] The invention relates to a composite structure SSZ-13@Silicalite-1 molecular sieve and its preparation method and application, belonging to the technical field of molecular sieve preparation. Background technique [0002] SSZ-13 molecular sieve was first reported in the patent US4544538 of Chevron Corporation of the United States in 1985. Its skeleton structure code is CHA, and it has a three-dimensional eight-membered ring topology. Introducing Cu into SSZ-13 Molecular Sieve 2+ The formed Cu-SSZ-13 is a kind of NH with excellent performance 3 -SCR reaction catalyst, which has been commercially applied in diesel vehicle exhaust gas treatment system. [0003] However, in practical application scenarios, the NH of diesel vehicles 3 -The SCR module is located downstream of the particulate filter module (Diesel Particulate Filter, DPF). Frequent regeneration of the DPF and unsteady engine conditions often produce instantaneous high temperatures >800°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J29/70B01J29/76B01J37/30C07C11/04C07C11/06C07C1/20B01D53/86B01D53/56B01J20/16B01J20/30B01D53/02
CPCB01D53/02B01D53/8628B01J20/16C01B39/48C07C1/20B01J29/7015B01J29/763B01J37/30C01P2002/72C01P2004/03C01P2004/80C07C2529/70B01D2257/504C07C11/04C07C11/06Y02P20/52Y02C20/40Y02P20/151Y02P20/50Y02P30/20Y02P30/40
Inventor 宋锡滨艾辽东焦英训潘光军
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD