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TON/MRE double-topological-structure composite molecular sieve and preparation thereof

A composite molecular sieve and topological structure technology, applied in the field of molecular sieves, can solve problems such as poor product reproducibility, difficult control of process conditions, and long process, and achieve the effects of less miscellaneous crystal content, easy control of operating conditions, and simple synthesis methods

Active Publication Date: 2022-06-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the existing methods for preparing composite molecular sieves are difficult to control the process conditions, the process is long and the product reproducibility is poor, the present invention provides a method for preparing a TON / *MRE dual topology composite molecular sieve

Method used

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  • TON/MRE double-topological-structure composite molecular sieve and preparation thereof
  • TON/MRE double-topological-structure composite molecular sieve and preparation thereof
  • TON/MRE double-topological-structure composite molecular sieve and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 3.29g of 1,6-hexanediamine in 16ml of distilled water, stir until it becomes clear, then add 1.08g of ammonium fluoride, 0.045g of aluminum sulfate octadecahydrate, 0.13g of potassium hydroxide, stir until it is completely dissolved, then add 0.0053 gZSM-22 seed crystals and 0.0053g ZSM-48 mixed seed crystals were added dropwise with 8 g of silica sol (30%), and after stirring for 0.5 h, a gel mixture with the following molar ratio was formed (silica sol was SiO 2 In terms of Al source, Al 2 O 3 Calculated, the alkali source is OH - meter): silicon source: aluminum source: alkali source: template agent: water: ammonium fluoride = 1: 0.0038: 0.058: 0.7: 30: 0.7.

[0025] The gelatinous mixture was put into a stainless steel reaction kettle with a polytetrafluoroethylene lining, placed in an oven at 160°C, and crystallized under autogenous pressure for 2 days. The filtrate of the solid product obtained by washing was neutral, and dried at 70°C for 20h to obtai...

Embodiment 2

[0028] Dissolve 1.65g of 1,6-hexanediamine in 30ml of distilled water, stir until it becomes clear, then add 1.08g of ammonium fluoride, 0.065g of aluminum sulfate octadecahydrate, 0.23g of potassium hydroxide, stir until it is completely dissolved, then add 0.0045 g gZSM-22 seed crystal and 0.0045g ZSM-48 mixed seed crystal, 8g silica sol (40%) was added dropwise, and after stirring for 1 hour, a gel mixture with the following molar ratio was formed (silica sol was SiO 2 The aluminum source is calculated as Al, and the alkali source is calculated as OH - meter): silicon source: aluminum source: alkali source: template agent: water: ammonium fluoride = 1: 0.0045: 0.03: 0.3: 36: 0.5.

[0029] The gelatinous mixture was put into a stainless steel reaction kettle with a Teflon lining, placed in an oven at 180°C, and crystallized for 8 hours under autogenous pressure. After the crystallization was completed, centrifuged and washed with deionized water. The obtained solid product ...

Embodiment 3

[0035] Dissolve 0.35g of 1,6-hexanediamine in 20ml of distilled water, stir until it becomes clear, then add 0.81g of ammonium fluoride, 0.11g of aluminum sulfate octadecahydrate, 0.16g of potassium hydroxide, stir until completely dissolved, then add 0.0040 gZSM-22 seed crystal and 0.0040g ZSM-48 mixed seed crystal, 7g of silica sol (30%) was added dropwise, and after stirring for 1.5h, a gel mixture with the following molar ratio was formed (silica sol is SiO 2 In terms of Al source, Al 2 O 3 Calculated, the alkali source is OH - Calculation): silicon source: aluminum source: alkali source: template agent: water: ammonium fluoride = 1: 0.0047: 0.08: 0.17: 40: 0.62.

[0036] The above gelatinous mixture was put into a stainless steel reaction kettle with a polytetrafluoroethylene lining, placed in an oven at 160 °C, and crystallized under autogenous pressure for 72 hours. The filtrate of the solid product obtained by washing was neutral, and dried at 70°C for 24h to obtain...

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Abstract

The invention relates to a composite molecular sieve with a TON / * MRE topological structure and a preparation method thereof, the composite molecular sieve is a zeolite molecular sieve containing a TON / * MRE skeleton topological structure, the Si: Al ratio of the composite molecular sieve is greater than 100, and the molar ratio of TON to * MRE is (90-5): (10-95). A one-step synthesis method is adopted for preparation, the relative content of TON and * MRE in the preparation process is controllable, the preparation method is simple, the required time is short, and the product reproducibility is good.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, in particular to a composite molecular sieve with TON and *MRE topological structures and a preparation method thereof. Background technique [0002] Molecular sieves are natural or artificially synthesized hydrated aluminosilicates (zeolites) or natural zeolites that have the function of screening molecules. They have many channels with uniform pore size and neatly arranged holes in their structure. Due to its high adsorption capacity, strong selectivity and high temperature resistance, molecular sieves were first widely used as adsorbents for adsorption dehydration and gas purification in the fields of organic chemicals and petrochemicals. Since the 1960s, molecular sieves have been used as catalysts for catalytic cracking. Due to their good thermal stability, high catalytic activity and high selectivity, they have been widely used in catalytic cracking reactions. According to the cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/80
CPCC01B39/04B01J29/80B01J29/7042B01J29/703C01P2002/72C01P2004/03C01P2006/12C01P2002/60Y02P20/52
Inventor 王琰李赛李耀婕盖立敏张巍孙景辉张海鹏李瑞丰郑家军范彬彬
Owner TAIYUAN UNIV OF TECH
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