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Method for preparing hierarchical pore ZSM-5 molecular sieve by using fly ash

A technology of ZSM-5 and fly ash, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., which can solve the problems of high impurities, restricted diffusion speed, low yield and crystallinity, etc. problems, to achieve the effect of accelerating the mass transfer rate, reducing economic costs, and improving the actual performance

Active Publication Date: 2020-04-21
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the current problems of using fly ash to synthesize molecular sieves with many impurities, low yield and crystallinity, and limiting diffusion speed, and to provide a method for preparing multi-stage porous ZSM-5 molecular sieves using fly ash Methods

Method used

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  • Method for preparing hierarchical pore ZSM-5 molecular sieve by using fly ash
  • Method for preparing hierarchical pore ZSM-5 molecular sieve by using fly ash
  • Method for preparing hierarchical pore ZSM-5 molecular sieve by using fly ash

Examples

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Embodiment 1

[0039] Take 200g of fly ash and calcinate at 800°C for 2h, after cooling, add 2000mL of distilled water, stir and wash with water for 12h, filter, dry, add 160g of sodium carbonate to mix, fully grind through a 200-mesh sieve, and then put it into a muffle furnace for calcination at 900°C for 4h , after cooling, the calcined ash was obtained, which was laurel green. After the calcined ash was ground through a 200-mesh sieve, 1600mL of 15wt% hydrochloric acid was added, stirred at 80°C for 2h, cooled, filtered, and the filtrate and filter residue were collected respectively. The filter residue was washed repeatedly until neutral, and after drying, it was calcined at 650°C for 2 hours to obtain SiO 2 Standby, weighing 92.08g. The filtrate is added in the separatory funnel, then the extractant is added in the separatory funnel, the volume ratio of the filtrate to the extractant is 0.8:1, the extractant is a mixture of tributyl phosphate and benzene, and the tributyl phosphate Th...

Embodiment 2

[0047] SiO 2 and Al(OH) 3 The extraction method is the same as in Example 1.

[0048] Using SiO extracted from fly ash 2 and Al(OH) 3 Synthesize multi-stage porous ZSM-5 molecular sieve, the molar ratio of each raw material used is: SiO 2 : Al(OH) 3 :NaOH:TPABr:CTAB:H 2 O=1:0.017:0.35:0.17:0.05:50, according to the above ratio, first add microporous template agent TPABr into the single-necked flask, then add deionized water to dissolve, then add sodium hydroxide to provide a certain alkaline environment , dissolved and then added SiO extracted from fly ash 2 and Al(OH) 3 , after stirring for 30 minutes, add the mesoporous template agent CTAB, heat the mixture in a constant temperature water bath at 60°C, and stir for 24 hours to obtain a gel-like substance. Move the gel-like substance into a reaction kettle with a polytetrafluoroethylene liner and place it in an oven for 140 Crystallize at ℃ for 24 hours, cool, filter, wash with water, dry, and calcine in a muffle furn...

Embodiment 3

[0051] SiO 2 and Al(OH) 3 The extraction method is the same as in Example 1.

[0052] Using SiO extracted from fly ash 2 and Al(OH) 3 Synthesize multi-stage porous ZSM-5 molecular sieve, the molar ratio of each raw material used is: SiO 2 : Al(OH) 3 :NaOH:TPABr:CTAB:H 2 O=1:0.0125:0.25:0.17:0.05:50, according to the above ratio, first add microporous template agent TPABr into the single-necked flask, then add deionized water to dissolve, then add sodium hydroxide to provide a certain alkaline environment , dissolved and then added SiO extracted from fly ash 2 and Al(OH) 3 , after stirring for 30 minutes, add the mesoporous template agent CTAB, heat the mixture in a constant temperature water bath at 60°C, and stir for 24 hours to obtain a gel-like substance. Move the gel-like substance into a reaction kettle with a polytetrafluoroethylene liner and place it in an oven for 180 Crystallize at ℃ for 48 hours, cool, filter, wash with water, dry, and calcine in a muffle fur...

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Abstract

The invention discloses a method for preparing a hierarchical pore ZSM-5 molecular sieve from fly ash. The method comprises the following steps: a, mixing fly ash and sodium carbonate, and calcining to obtain calcined ash; b, adding hydrochloric acid into the calcined ash, heating and stirring, cooling and filtering, and collecting filtrate and filter residues; c, adding an extraction agent into the filtrate, and extracting Al(OH)3; d, repeatedly cleaning the filter residues to be neutral, drying, and calcining to obtain SiO2; and e, weighing TPABr, dissolving TPABr in deionized water, addingNaOH, dissolving, adding the prepared Al(OH)3 and SiO2, stirring, adding CTAB, continuously stirring under a water bath condition to obtain a gelatinous substance, crystallizing, cooling, filtering, washing with water, drying, and calcining to obtain the Na-ZSM-5 molecular sieve. According to the hierarchical pore ZSM-5 molecular sieve synthesized by the method, pore channels with various pore diameters are introduced into the molecular sieve at the same time, so that the mass transfer rate is increased, and the actual use performance is improved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of fly ash, in particular to a method for preparing multi-stage ZSM-5 molecular sieves by using fly ash. Background technique [0002] Fly ash is a solid residue produced by coal combustion. Its mineral composition is very complex. Its main mineral phases include mullite, quartz, illite and siderite. There are approximately 500 million tons of fly ash worldwide each year, and improper disposal of fly ash can lead to serious impacts, including soil degradation, hazards to human health, and environmental pollution. Fly ash particles are easily suspended in the air due to their small size and have become a major source of gas pollution. Continuous exposure to fly ash can cause irritation of human organs such as the eyes, skin, nose, throat and respiratory tract, and may even lead to arsenic poisoning. Dumped fly ash can reach subsoil and eventually lead to siltation, clogging natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
CPCC01B39/38C01P2002/72C01P2004/03C01P2002/85C01P2006/17
Inventor 钱翌张海明李龙
Owner QINGDAO UNIV OF SCI & TECH
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