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A kind of preparation method of boron-containing nu-87 molecular sieve

A NU-87, molecular sieve technology, applied in molecular sieve catalysts, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problem of high preparation cost, and achieve the effect of reducing preparation cost, simple process and high crystallinity

Active Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, at present, in the preparation of boron-containing NU-87 molecular sieves, relatively expensive brominated polymethylene bis-ammonium is used as a template, and the preparation cost is relatively high.

Method used

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  • A kind of preparation method of boron-containing nu-87 molecular sieve
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  • A kind of preparation method of boron-containing nu-87 molecular sieve

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preparation example Construction

[0030] The present invention provides a kind of preparation method of boron-containing NU-87 molecular sieve, wherein, the method comprises:

[0031] (1) provide a kind of mother liquor, described mother liquor contains silicon source, aluminum source, boron source, sodium hydroxide and water,

[0032] And provide a kind of templating agent solution, described templating agent solution contains first templating agent R1, second templating agent R2 and water; Described first templating agent R1 is brominated decacene quaternary ammonium, and described second templating agent R2 At least one of tri-n-propylamine, 1,3-propanediamine, 1,4-butanediamine, 1,6-hexanediamine and 1,8-octanediamine, preferably 1,3-propanediamine Amines and 1,4-butanediamine;

[0033] (2) under stirring, the template solution is added to the mother liquor, and a seed crystal is added to obtain a synthetic sol;

[0034] (3) hydrothermal crystallization of the synthetic sol;

[0035] (4) The mixture obt...

Embodiment 1

[0072] This example is used to illustrate the preparation of the boron-containing NU-87 molecular sieve of the present invention.

[0073] The process for preparing boron-containing NU-87 molecular sieves is as follows figure 1 shown.

[0074] At room temperature and under stirring, sodium hydroxide, sodium metaaluminate, boric acid, silica sol and deionized water are mixed and dissolved to form a molecular sieve synthesis mother liquor.

[0075] Mixing and dissolving bromodecadecane quaternary amine (R1) and 1,3-propanediamine (R2) in deionized water at room temperature to prepare an aqueous solution of an organic template.

[0076] At room temperature and under stirring, an aqueous solution of an organic template is added to the mother liquor for synthesizing molecular sieves, and SiO 2 SiO 2 -Al 2 o 3 -B 2 o 3 -Na 2 O-R1-R2-H 2 O stable sol, the molar ratio of each component in the sol system is: 55SiO 2 :0.5Al 2 o 3 :0.5B 2 o 3 :3R1:3R2:11Na 2 O:2600H 2 O. ...

Embodiment 2

[0080] This example is used to illustrate the preparation of the boron-containing NU-87 molecular sieve of the present invention.

[0081] The boron-containing NU-87 molecular sieve was prepared according to the synthesis process of Example 1, except that the molar ratio of R1:R2=5:2.5. After the crystallization reaction product was filtered, washed and dried at 80°C for 12 hours, it was placed in a muffle furnace and raised to 550°C at a heating rate of 2°C / min and kept for 6 hours to remove the template agent to obtain boron-containing NU- 87 molecular sieves.

[0082] The sample was characterized as boron-containing NU-87 molecular sieve by XRD and IR.

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Abstract

The invention relates to the field of molecular sieve material preparation, and discloses a method for preparing a boron-containing NU-87 molecular sieve. The method comprises the following steps (1)providing a mother solution containing a silicon source, an aluminum source, a boron source, sodium hydroxide and water, and providing a template agent solution which contains a first template agent R1, a second template agent R2 and water; (2) adding the template agent solution into the mother solution under a stirring state, and adding seed crystal to prepare synthesized sol; (3) performing hydrothermal crystallizing on the synthesized sol; and (4) performing solid-liquid separation on the mixture obtained in the hydrothermal crystallization, drying and optionally roasting the solid phase. According to the preparation method, the time for hydrothermal crystallization can be shortened, the usage of the first template agent decamethonium bromide can be reduced to a great extent; and furthermore, the boron-containing NU-87 molecular sieve prepared by the method has a relatively high crystallizing degree.

Description

technical field [0001] The invention relates to the preparation technology of molecular sieves, in particular to a preparation method of boron-containing NU-87 molecular sieves. Background technique [0002] NU-87 molecular sieve is a high-silicon silicon-alumina molecular sieve with NES topology. It has ten-membered ring parallel channels with a diameter of 0.47nm×0.60nm and twelve-membered ring channels with a diameter of 0.53nm×0.68nm. The formed two-dimensional microporous system communicates with the outside world only through the ten-membered ring window of the ten-membered ring channel. This special pore structure and chemical composition make NU-87 and heteroatom NU-87 molecular sieves suitable for catalytic reactions in which the product molecules are slender but the reaction intermediates or transition states are "huge", such as the alkylation and isomerization of aromatic hydrocarbons. Disproportionation and disproportionation reactions, showing unique catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04C01B39/48C01B39/12
CPCC01B39/12C01B39/48C01P2002/72C01P2002/82C01P2004/03
Inventor 武光军李兰冬关乃佳王永睿
Owner CHINA PETROLEUM & CHEM CORP
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