Mesoporous molecular sieve catalyst for catalytic cracking of waste plastics as well as preparation method and application thereof

A technology of mesoporous molecular sieves and waste plastics, which is applied in the field of catalysts for catalytic cracking of waste plastics. It can solve the problems of low yield, low quality of oil products, and difficulty in regulating the surface acidity of mesoporous molecular sieves. active effect

Inactive Publication Date: 2012-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the pyrolysis process, waste plastics first depolymerize into larger polymers, and the small pore size of microporous molecular sieves limits their adsorption and catalytic effects on large-volume polymers, resulting in poor quality oil products. High, low yield
Patent CN200410022996.2 discloses a method for preparing mesoporous molecular sieves from sepiolite, but this method needs to treat sepiolite with acid until the Mg content is less than 3%, and it is difficult to control the surface acidity of mesoporous molecular sieves

Method used

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  • Mesoporous molecular sieve catalyst for catalytic cracking of waste plastics as well as preparation method and application thereof
  • Mesoporous molecular sieve catalyst for catalytic cracking of waste plastics as well as preparation method and application thereof
  • Mesoporous molecular sieve catalyst for catalytic cracking of waste plastics as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of mesoporous molecular sieve catalyst: After natural sepiolite is treated with 1M sulfuric acid for 5h, the sepiolite with Mg content of 10.3% is obtained, activated in alkaline sodium hydroxide solution, and the activated alkalinity is 10g / L ; When synthesized, the molar ratio is n(CTAB):n(SiO 2 ):n(H 2 O)=1.0:2.5:500 take CTAB and sepiolite. Dissolve CTAB in deionized water, slowly add alkali to activate sepiolite, adjust the pH to 11 with hydrochloric acid (1mol / L), and stir magnetically for 5h. Then the mixture was poured into a polytetrafluoroethylene reactor and crystallized at 100°C for 24h. The crystallized mixed solution was washed, dried and placed in a muffle furnace. First, the temperature was slowly raised to 250°C, kept for 2 hours, then slowly raised to 550°C, kept for 4 hours, and then lowered to room temperature to obtain the carrier Mg-MCM-41 , specific surface area 928m 2 / g, pore diameter 2.94nm, pore volume 1.04cm 3 / g. Weigh ...

Embodiment 2

[0032] (1) The magnesium mesoporous molecular sieve type catalyst carrier is prepared according to the process of Example 1, and the Mg content is adjusted to 18%, to obtain a Mg-MCM-41 specific surface area of ​​908m 2 / g, pore diameter 2.84nm, pore volume 1.01cm 3 / g. Weigh a certain amount of Mg-MCM-41 and activate it at 200°C for 1 hour, then use it. Measure TiCl4 2ml (according to 10% of the amount of Mg-MCM-41), dispersed in 50ml of ethanol, added Mg-MCM-41, stirred for 3h. Then it was dried at 80°C for 8h to obtain a white powder. After the white powder is granulated, it is calcined at 500°C for 4 hours in a muffle furnace to obtain a mesoporous molecular sieve catalyst TiO for catalytic cracking of waste plastics. 2 / Mg-MCM-41, specific surface area 778m 2 / g, pore diameter 2.68nm, pore volume 0.80cm 3 / g

[0033] (2) Catalytic cracking process of waste plastics: wash waste plastics, crush them, pass through a 5mm mesh screen, and add mesoporous molecular sieve c...

Embodiment 3

[0035] (1) The magnesium mesoporous molecular sieve type catalyst support is prepared according to the process of Example 1, and the Mg content is adjusted to 0.5%, to obtain Mg-MCM-41 with a specific surface area of ​​1013m 2 / g, pore diameter 3.01nm, pore volume 1.13cm 3 / g. A certain amount of Mg-MCM-41 was weighed and activated at 100°C for 3 hours, and then used. Weigh ammonium molybdate (according to 15% of the amount of MCM-41), disperse in 70ml of toluene, add Mg-MCM-41, and stir at 60°C for 2h. Then dry at 90° C. for 0.5 h to obtain a light yellow powder, and soak the powder in 15 g / L nickel nitrate solution for 30 minutes to obtain a gray powder. After the gray powder is granulated, it is calcined at 550°C for 2 hours in a muffle furnace to obtain a mesoporous molecular sieve catalyst (MoO 3 , NiO) / Mg-MCM-41, specific surface area 813m 2 / g, pore diameter 2.81nm, pore volume 0.91cm 3 / g

[0036] (2) Catalytic cracking process of waste plastics: wash waste plast...

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Abstract

The invention discloses a mesoporous molecular sieve catalyst for the catalytic cracking of waste plastics and a preparation method thereof. The preparation method comprises the following steps of: carrying out direct alkaline transformation on a natural sepiolite to prepare a Mg-MCM-41 mesoporous molecular sieve with Mg content not larger than 24%, and mixing the obtained Mg-MCM-41 mesoporous molecular sieve with raw materials of catalyst active components dispersed in an organic solvent; stirring to obtain gelatinous substances; drying, grinding and sieving to obtain powder; and granulating, placing into a muffle furnace and roasting to obtain the mesoporous molecular sieve catalyst for the catalytic cracking of the waste plastics. The mesoporous molecular sieve catalyst prepared by theinvention has the advantages of larger pore diameter, uniform pore diameter distribution, high specific surface area, strong adsorption capacity and high catalytic activity, can effectively reduce the cracking temperature, shorten the reaction time and improve the transformation rate and the monomer yield in the catalytic cracking of waste styrene plastics.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for catalytically cracking waste plastics and its synthesis and application. Background technique [0002] With the advancement of polymer synthesis technology, the development of the plastics industry has provided humans with a variety of plastic products. With its advantages of light weight, corrosion resistance, easy processing and molding, low cost, and convenient use, plastics are widely used in many industries of the national economy. From industrial and agricultural production to basic necessities of life, plastic products have penetrated into every corner of society. It has entered into all fields of people's production and life. The widespread use of plastic products has brought revolutionary changes to people's production and life, and has produced huge economic and social benefits. However, at the same time, the aging, discarding, and discardi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01J29/70B01J29/76B01J35/10C07C15/46C07C4/22C01B39/02
Inventor 金胜明关豪元庄永卿刘莉蒋静
Owner CENT SOUTH UNIV
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