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A method for treating molecular sieves with fluorine-containing alkaline medium

An alkaline medium, molecular sieve technology, applied in the direction of mercerized crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc. Problems such as limited tunability of treatment methods, massive dissolution of molecular sieves, and destruction of micropore structure

Active Publication Date: 2017-09-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simply increasing the treatment temperature of pure lye and the concentration of lye will cause the secondary pore diameter to become larger. At the same time, high-concentration alkaline solution will easily lead to a large amount of dissolution of molecular sieves and destruction of micropore structure, which makes the alkaline treatment method possible. Limited tonality, restricted applications

Method used

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  • A method for treating molecular sieves with fluorine-containing alkaline medium
  • A method for treating molecular sieves with fluorine-containing alkaline medium
  • A method for treating molecular sieves with fluorine-containing alkaline medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 10g ZSM-5 molecular sieve (Si / Al=40, Na 2 O content 4 In solution F, magnetically stir at 60°C for 35 minutes, then filter and wash until neutral, dry at 120°C for 12 hours, and then bake in a muffle furnace at 550°C for 3 hours. Add the obtained molecular sieves to 0.8 mol / L ammonium nitrate solution, the solid-to-liquid ratio is 1:20, magnetically stir at 85°C for 2 hours, then filter and wash, dry at 120°C for 12 hours, and then place in a muffle furnace Calcined at 550°C for 6 hours, designated as sample A.

Embodiment 2

[0027] Get 15g ZSM-5 molecular sieve (Si / Al=37, Na 2 O content 0.25wt%) was added to 200ml containing 0.25mol / LKOH-0.05mol / L NH 4 In the mixed solution of F, magnetically stir at 80°C for 60 minutes, then filter and wash until neutral, dry at 110°C for 12 hours, and then bake in a muffle furnace at 540°C for 3 hours. The obtained molecular sieves were added to 0.8 mol / L ammonium nitrate solution, the solid-to-liquid ratio was 1:20, magnetically stirred at 85°C for 2 hours, then filtered and washed, dried at 120°C for 12h, and then placed in a muffle furnace at 550 ℃ for 6 hours, recorded as sample B.

Embodiment 3

[0029] Get 150g ZSM-5 molecular sieve (Si / Al=60, Na 2 O content 0.09wt%) was added to 1800ml of a mixed solution containing 0.15mol / LNaOH-0.02mol / L KF, stirred magnetically at 55°C for 60 minutes, then filtered and washed until neutral, dried at 120°C for 12 hours and placed in a muffle furnace Baking at 530°C for 3 hours. Add the obtained molecular sieves to 0.8 mol / L ammonium nitrate solution, the solid-to-liquid ratio is 1:10, magnetically stir at 80°C for 2 hours, then filter and wash, dry at 120°C for 12 hours, and then place in a muffle furnace Calcined at 530°C for 6 hours, recorded as sample C.

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Abstract

The invention discloses a method for treating molecular sieves with a fluorine-containing alkaline medium, which belongs to the fields of molecular sieve modification, adsorption material preparation and catalyst preparation. The method is to introduce fluorine element into the molecular sieve alkali treatment medium in a certain way, then heat treatment, filter and wash to neutrality, and after drying, ion exchange and roasting are carried out to exchange into hydrogen molecular sieve. This method is simple in operation and low in cost. The micropores of the modified molecular sieve material are maintained well, and a rich secondary pore structure is produced, while the acidity is maintained well.

Description

technical field [0001] The invention belongs to the fields of molecular sieve modification, adsorption material preparation and catalyst preparation, and specifically relates to a method for treating molecular sieves with a fluorine-containing alkaline medium Background technique [0002] Since the advent of molecular sieves, due to their rich microporous structure, good hydrothermal stability and strong acidity, they have been widely used in catalytic fields such as petroleum processing, coal chemical industry, environmental protection and fine chemical industry as catalytic and adsorption separation materials. Especially ZSM-5, mordenite and other molecular sieves have been widely used in cracking, isomerization, alkylation, aromatization and other reactions. Due to the small pore size of microporous molecular sieves, there are problems such as adsorption, diffusion limitation, and easy carbon deposition in the reaction. Improving its pore structure and acid property distr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/36C01B39/38C01B39/26
Inventor 黄声骏徐龙伢于丽丽陈福存刘珍妮谢素娟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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