Method for synthetizing EMC-2 zeolite in absence of template agent

Abstract

The invention relates to a method for synthetizing EMC-2 zeolite in absence of a template agent. No organic template agent is added, and the EMC-2 zeolite is prepared by hydro-thermal synthesis. By adopting the method, use of a toxic template agent is avoided, and environmental pollution caused by high-temperature roasting treatment of the template agent at the later stage of the product is avoided. The EMC-2 zeolite has a broad application prospect by the economic and environmental preparation method due to the superiority of the EMC-2 zeolite structure.

Description

technical field

[0001] The invention relates to a synthesis method of EMC-2 zeolite.

[0002] The traditional synthesis method of EMC-2 zeolite is carried out under the condition of 18-crown ether-6 as the organic template agent. The template agent of 18-crown ether-6 is not only expensive, but also highly toxic, which hinders its scale Production; and when the synthetic product removes the template agent in the method of high-temperature roasting, a large amount of harmful gases will be produced, which will pollute the environment and seriously restrict its practical application. The invention discloses a method for preparing EMC-2 zeolite by using a traditional hydrothermal synthesis method and directing seed crystals without adding an organic template. This method is not only of great significance in basic research, but also has broad application prospects as a catalyst in the fields of petroleum and chemical industry because of its economy and environmental protection. ...

Examples

Embodiment 1

[0015] At room temperature, take 0.368 grams of sodium metaaluminate, add 3.1 milliliters of 10 mol / liter sodium hydroxide solution and 6.9 milliliters of distilled water, stir and mix evenly to a clear solution, then add 0.666 grams of white carbon black, stir for half an hour, and finally 0.167 g of seed crystals were added, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reaction kettle containing polytetrafluoroethylene, and crystallize at 50° C. for 9 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

Embodiment 2

[0017] At room temperature, take 0.368 grams of sodium metaaluminate, add 2.8 milliliters of 11 mol / liter sodium hydroxide solution and 7.2 milliliters of distilled water, stir and mix until a clear solution is obtained, then add 2.360 grams of tetraethyl orthosilicate, and stir for half an hour , and finally added 0.133 g of seed crystals, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reactor containing polytetrafluoroethylene, and crystallize at 80° C. for 7 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

Embodiment 3

[0019] At room temperature, take 3.74 grams of aluminum sulfate, add 2.2 milliliters of 10 mol / liter sodium hydroxide solution and 7.8 milliliters of distilled water, stir and mix until a clear solution is obtained, then add 3.334 grams of white carbon black, stir for half an hour, and finally add 0.5 gram of seed crystals, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reactor containing polytetrafluoroethylene, and crystallize at 70° C. for 10 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

technical field

[0001] The invention relates to a synthesis method of EMC-2 zeolite.

[0002] The traditional synthesis method of EMC-2 zeolite is carried out under the condition of 18-crown ether-6 as the organic template agent. The template agent of 18-crown ether-6 is not only expensive, but also highly toxic, which hinders its scale Production; and when the synthetic product removes the template agent in the method of high-temperature roasting, a large amount of harmful gases will be produced, which will pollute the environment and seriously restrict its practical application. The invention discloses a method for preparing EMC-2 zeolite by using a traditional hydrothermal synthesis method and directing seed crystals without adding an organic template. This method is not only of great significance in basic research, but also has broad application prospects as a catalyst in the fields of petroleum and chemical industry because of its economy and environmental protection. ...

Examples

Embodiment 1

[0015] At room temperature, take 0.368 grams of sodium metaaluminate, add 3.1 milliliters of 10 mol / liter sodium hydroxide solution and 6.9 milliliters of distilled water, stir and mix evenly to a clear solution, then add 0.666 grams of white carbon black, stir for half an hour, and finally 0.167 g of seed crystals were added, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reaction kettle containing polytetrafluoroethylene, and crystallize at 50° C. for 9 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

Embodiment 2

[0017] At room temperature, take 0.368 grams of sodium metaaluminate, add 2.8 milliliters of 11 mol / liter sodium hydroxide solution and 7.2 milliliters of distilled water, stir and mix until a clear solution is obtained, then add 2.360 grams of tetraethyl orthosilicate, and stir for half an hour , and finally added 0.133 g of seed crystals, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reactor containing polytetrafluoroethylene, and crystallize at 80° C. for 7 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

Embodiment 3

[0019] At room temperature, take 3.74 grams of aluminum sulfate, add 2.2 milliliters of 10 mol / liter sodium hydroxide solution and 7.8 milliliters of distilled water, stir and mix until a clear solution is obtained, then add 3.334 grams of white carbon black, stir for half an hour, and finally add 0.5 gram of seed crystals, stirred for 2 hours, and aged at room temperature for 1 day. Transfer to a 20 ml stainless steel reactor containing polytetrafluoroethylene, and crystallize at 70° C. for 10 days under autogenous pressure. Quenching, washing, filtering, and natural drying to obtain the molecular sieve powder.

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