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Synthesis method of nano KFI molecular sieve

A molecular sieve and nanotechnology, applied in the synthesis field of nano KFI molecular sieve, can solve the problems of expensive template agent, difficult control of sub-nanometer size, large environmental pollution, etc., and achieve the effect of delaying crystal growth, low cost and strong catalytic performance.

Inactive Publication Date: 2021-03-12
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems in the existing nano-scale zeolite synthesis technology that the sub-nanometer size is difficult to control, the template agent is expensive, and has great environmental pollution, the present invention discloses a synthesis method of nano-KFI molecular sieve, which has the advantages of simple operation and low price. It can solve the difficulties in the synthesis process of nano KFI zeolite

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  • Synthesis method of nano KFI molecular sieve
  • Synthesis method of nano KFI molecular sieve
  • Synthesis method of nano KFI molecular sieve

Examples

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Embodiment 1

[0033] A method for synthesizing nano KFI molecular sieves, comprising the following steps:

[0034] 1) Preparation of A solution

[0035] Heat and stir the mixture of 0.28g of aluminum hydroxide, 0.36g of potassium hydroxide and 1.3mL of distilled water until clear and transparent, then cool at room temperature to obtain solution A, the heating temperature is 60°C, and the stirring rate is 300 rpm;

[0036]2) Preparation of B solution

[0037] At room temperature, dissolve 0.04g of solid strontium nitrate in 2.0mL of distilled water, then add 0.0002g of β-cyclodextrin and 1.7g of silica sol and stir evenly to obtain solution B;

[0038] 3) Precursor gel preparation

[0039] Take 2.0 mL of solution A and 2.4 mL of solution B and mix thoroughly, and stir to obtain the precursor gel;

[0040] 4) Molecular sieve synthesis

[0041] Transfer the precursor gel prepared in step (3) to a polytetrafluoroethylene-lined stainless steel autoclave, heat it statically in an oven at 150°...

Embodiment 2

[0043] A method for synthesizing nano KFI molecular sieves, comprising the following steps:

[0044] 1) Preparation of A solution

[0045] Heat and stir the mixture of 0.28g of aluminum hydroxide, 0.48g of potassium hydroxide and 2.6mL of distilled water until it becomes clear and transparent, then cool at room temperature to obtain solution A, the heating temperature is 50°C, and the stirring rate is 100 rpm;

[0046] 2) Preparation of B solution

[0047] At room temperature, dissolve 0.04 g of solid strontium nitrate in 3.4 mL of distilled water, then add 0.0006 g of β-cyclodextrin and continue stirring for 25 minutes, and 2.8 g of silica sol and continue stirring for 35 minutes to obtain solution B;

[0048] 3) Precursor gel preparation

[0049] Take 2 mL of solution A and solution B, mix thoroughly, and stir to obtain the precursor gel;

[0050] 4) Molecular sieve synthesis

[0051] The precursor gel prepared in step (3) was transferred to a polytetrafluoroethylene-lin...

Embodiment 3

[0053] A method for synthesizing nano KFI molecular sieves, comprising the following steps:

[0054] 1) Preparation of A solution

[0055] Heat and stir the mixture of 0.28g of aluminum hydroxide, 0.40g of potassium hydroxide and 2mL of distilled water until it becomes clear and transparent, then cool at room temperature to obtain solution A, the heating temperature is 90°C, and the stirring rate is 500 rpm;

[0056] 2) Preparation of B solution

[0057] At room temperature, dissolve 0.04 g of solid strontium nitrate in 3 mL of distilled water, then add 0.001 g of β-cyclodextrin and continue stirring for 30 minutes, then add 2.5 g of silica sol and continue stirring for 25 minutes to obtain solution B;

[0058] 3) Precursor gel preparation

[0059] Take 2 mL of solution A and solution B, mix thoroughly, and stir to obtain the precursor gel;

[0060] 4) Molecular sieve synthesis

[0061] Transfer the precursor gel prepared in step (3) to a polytetrafluoroethylene-lined stai...

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Abstract

The invention belongs to the technical field of molecular sieve synthesis, and discloses a method for synthesizing a nano KFI molecular sieve. The method comprises the following steps: heating and stirring a mixture of aluminum hydroxide, potassium hydroxide and distilled water to be clear and transparent, and performing cooling at room temperature to obtain a solution A; dissolving solid strontium nitrate in distilled water, then adding cyclodextrin and silica sol, and performing uniform stirring to obtain a solution B; performing uniform stirring of the solution A and the solution B to obtain precursor gel; transferring the prepared precursor gel into a high-pressure reaction kettle, performing heating and crystallizing in a drying oven, performing cooling to room temperature, and washing and drying the obtained solid product to obtain the nano KFI molecular sieve. According to the invention, cyclodextrin is used as a template agent to synthesize the nano zeolite molecular sieve, themethod has the advantages of low cost, simple operation, short reaction time and the like, and the synthesized nano KFI molecular sieve contains abundant micropores and also has very obvious mesoporous distribution, thus being an excellent hierarchical pore material. The nano zeolite has very important practical value in the aspects of catalysis, adsorption, separation and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a method for synthesizing molecular sieves, in particular to a method for synthesizing nanometer KFI molecular sieves. Background technique [0002] The framework structure of KFI-type zeolites consists of t-grc and t-pau structural units, containing α and γ cages, each α cage is connected to six γ cages by a flat 8-membered torus, and each γ cage is connected to two alpha cage and four other gamma cages, this zeolite was first synthesized by Kerr in 1966. These two different types of cages in the KFI-type framework may have different adsorption characteristics for different gas molecules; moreover, compared with zeolites such as AFY, BPH, and LTA, KFI-type zeolites have high adsorption capacity and high gas mixture The selectivity has reached the best balance, and it is a molecular sieve adsorbent with excellent performance. However, most of the synthesized zeolites, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B82Y40/00
CPCC01B39/48B82Y40/00C01P2006/12C01P2006/14C01P2006/16
Inventor 杨江峰刘佳奇唐轩李晋平
Owner TAIYUAN UNIV OF TECH
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