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A kind of method using modified diatomite as raw material to synthesize cr-al-zsm-22 molecular sieve

A technology of diatomite and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problem of high cost, achieve high raw material utilization rate, reduce production cost, improve catalytic activity and selectivity

Active Publication Date: 2017-05-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the published literature, ZSM-22 is synthesized with tetraethyl orthosilicate as a silicon source, and the cost is too high

Method used

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  • A kind of method using modified diatomite as raw material to synthesize cr-al-zsm-22 molecular sieve
  • A kind of method using modified diatomite as raw material to synthesize cr-al-zsm-22 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: Preparation of Cr-Al-ZSM-22 molecular sieve

[0020] Preparation of modified diatomite: Mix diatomite and 5M hydrochloric acid evenly, add 10mL hydrochloric acid per 100g diatomite, then put the mixture into a reaction kettle, and treat it at 180°C for 10 hours; filter the acid-treated product , washing, and drying at 120°C to obtain modified diatomite.

[0021] Dissolve 0.085g of aluminum sulfate and 0.098g of chromium sulfate mixture (the molar ratio of Cr / (Cr+Al) is 0.5:1) in 17mL of deionized water and stir evenly, add 3g of modified diatomaceous earth under stirring, and then add Add 0.224g KOH therein, and continue stirring to form a gel evenly. The molar ratio of the gel in terms of oxides is: SiO 2 :0.01(Cr 2 o 3 +Al 2 o 3 ):0.08K 2 O:19H 2 O. Then the above reaction materials were added into a polytetrafluoroethylene stainless steel reactor, crystallized at 160°C for 2 days, filtered, washed, and dried at 110°C to obtain 2.3g of Cr-Al-ZSM...

Embodiment 2

[0022] Embodiment 2: replace KOH with NaOH as alkali source

[0023] Same as Example 1, just change KOH into 0.18g of NaOH, that is, the molar ratio is SiO 2 :0.01(Cr 2 o 3 +Al 2 o 3 ):0.09Na 2 O:19H 2 O. After filtering, washing and drying at 130°C, 2.5g of Cr-Al-ZSM-22 molecular sieve can be obtained.

Embodiment 3

[0024] Example 3: Synthesis of Cr-Al-ZSM-22 molecular sieve at relatively low temperature

[0025] Same as Example 2, except crystallization at 130°C for 5 days, filtering, washing, and drying at 120°C to obtain 1.8 g of Cr-Al-ZSM-22 molecular sieve.

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Abstract

The invention relates to a method for synthesis of Cr-Al-ZSM-22 molecular sieve from modified diatomite as the main raw material without organic template agent and crystal seed. The specific steps include: dissolving a soluble aluminum salt and a soluble chromium salt in deionized water under stirring to form a chromium-aluminum solution, adding alkaline under stirring, then adding modified diatomite, further stirring the materials evenly, and finally placing the mixture in a reaction kettle to conduct crystallization; and subjecting product to filtering, washing and drying, thus obtaining the Cr-Al-ZSM-22 molecular sieve raw powder. The method provided by the invention adopts modified diatomite as the main raw material to rapidly synthesize high crystallinity Cr-Al-ZSM-22 molecular sieve under the condition of no organic template agent and crystal seed, not only does not use organic template agent and crystal seed, but also shortens the crystallization time, reduces energy consumption, and lowers the synthesis cost, and the introduction of chromium is conducive to improving the catalytic activity and selectivity. The raw materials adopted by the method are all inorganic matters, are environmentally friendly and have low price, and are suitable for industrial production.

Description

technical field [0001] The invention belongs to a technical method for preparing molecular sieves, and in particular relates to a method for synthesizing Cr-Al-ZSM-22 molecular sieves by using modified diatomite as a raw material under the conditions of no organic template agent and no crystal seeds. Background technique [0002] Zeolite molecular sieve is a kind of microporous crystal material with skeleton structure. Due to its structural and performance characteristics, it has been widely used in various fields such as catalysis, adsorption and ion exchange. In addition to its great role in the traditional chemical industry, zeolite is now gradually showing its development potential in other related material fields. [0003] In the 1980s, Mobil Corporation of the United States developed ZSM-22 zeolite, whose skeleton includes five-membered rings, six-membered rings and ten-membered ring structures, and is a high-silicon molecular sieve material with a TON topology. Beca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 邹永存李国栋冯亮亮
Owner JILIN UNIV
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