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Nanocrystalline accumulation meso-microporous ZSM-5 catalyst and preparation and application

A ZSM-5 catalyst technology, applied in the field of nanocrystalline stacked mesoporous ZSM-5 catalyst and its preparation and application, can solve the problems of cumbersome overall steps and achieve good filtration effect, large specific surface area and pore volume, The effect of uniform size

Active Publication Date: 2015-04-22
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the previous method, the process has been improved and improved, but the overall steps are still a bit cumbersome

Method used

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  • Nanocrystalline accumulation meso-microporous ZSM-5 catalyst and preparation and application
  • Nanocrystalline accumulation meso-microporous ZSM-5 catalyst and preparation and application
  • Nanocrystalline accumulation meso-microporous ZSM-5 catalyst and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Add solid sodium silicate and sodium hydroxide to a part of deionized water in sequence, the molar ratio of sodium hydroxide to water is 0.025, mix and stir at 20°C for 2 hours to prepare liquid A. Afterwards, tetraethylammonium bromide, aluminum hydroxide, sodium chloride and the remaining deionized water were thoroughly mixed at 20°C for 2 hours to prepare liquid B. Slowly add liquid B to liquid A, mix well and stir at 20°C for 24h. Among them, based on molar ratio, in the synthesis initial gel system, OH - :Al 2 o 3 : SiO 2 :H 2 O: Na + :TPA + =0.1:0.005:1:5:0.05:0.1. The mixed gel was crystallized in an oven. The crystallization condition of the first stage was crystallization at 100°C for 1 day, and the crystallization condition of the second stage was crystallization at 170°C for 1 day. After the product is filtered, washed and dried, the ZSM-5 molecular sieve raw powder with high crystallinity and mesoporous composite state with a silicon-aluminum ratio o...

Embodiment 2

[0118] Add white carbon black and sodium hydroxide to a part of deionized water in turn, the molar ratio of sodium hydroxide to water is 0.016, mix and stir at 10°C for 4 hours to prepare liquid A. Afterwards, tetraethylammonium bromide, aluminum hydroxide, sodium bromide and the remaining deionized water were thoroughly mixed at 10°C for 2 hours to prepare liquid B. Slowly add liquid B to liquid A and mix evenly at 10°C for 12 hours. Among them, based on molar ratio, in the synthesis initial gel system, OH - :Al 2 o 3 : SiO 2 :H 2 O: Na + :TPA + =0.2:0.002:1:15:0.1:0.3. The mixed gel was crystallized in an oven. The crystallization condition of the first stage was crystallization at 100°C for 1 day, and the crystallization condition of the second stage was crystallization at 170°C for 2 days. After the product is filtered, washed and dried, the ZSM-5 molecular sieve raw powder with high crystallinity and mesoporous composite in a nanocrystalline stacked state with a s...

Embodiment 3

[0120] Add coarse-porous silica gel and sodium hydroxide to a part of deionized water in sequence, the molar ratio of potassium hydroxide to water is 0.015, mix and stir at 12°C for 6 hours to prepare liquid A. Afterwards, tetraethylammonium bromide, aluminum hydroxide, sodium sulfate and the remaining deionized water were thoroughly mixed at 12°C for 2 hours to prepare liquid B. Slowly add liquid B to liquid A and mix evenly at 12°C for 16 hours. Among them, based on molar ratio, in the synthesis initial gel system, OH - :Al 2 o 3 : SiO 2 :H 2 O: Na + :TPA + =0.3:0.00125:1:25:0.15:0.5. The mixed gel was crystallized in an oven. The crystallization condition of the first stage was crystallization at 100°C for 3 days, and the crystallization condition of the second stage was crystallization at 170°C for 3 days. After the product is filtered, washed and dried, the ZSM-5 molecular sieve raw powder with high crystallinity and mesoporous composite in a nanocrystalline stack...

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Abstract

The invention provides a nanocrystalline accumulation meso-microporous ZSM-5 catalyst and preparation and application thereof. The catalyst is aggregated by small grains with particle sizes of 20-100 nm to an aggregation state with a particle size of 200-2000 nm, the aggregation state forms the catalyst, the specific surface area of the catalyst is 350-420 m<2> / g, and the pore volume of the catalyst is 0.25-0.35 cm<3> / g. According to the invention, a mesoporous-microporous composite nanocrystalline accumulation state ZSM-5 molecular sieve is directly synthesized; under the condition of adding no second template, a solid silicon source is pretreated to generate different degrees of depolymerization, the material ratio of the synthesis system is further adjusted, a sodium salt is added to adjust the growth speed in a crystallization process of the molecular sieve, and meanwhile, a two-stage crystallization method is adopted to promote the generation of a crystal nucleus at a low temperature and promote the growth of a crystal at a high temperature, so as to synthesize a serial grain aggregation state ZSM-5 molecular sieve.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a catalyst, and more specifically to a nanocrystalline stacked mesoporous ZSM-5 catalyst and its preparation and application. Background technique [0002] Propylene is an important basic chemical raw material, its traditional production depends on petroleum processing, and the shortage of petroleum resources promotes the development of non-petroleum route propylene production process. In recent years, coal-based methanol conversion to propylene (MTP) process has received increasing attention. As a new process for propylene production, MTP has the advantages of wide sources of raw materials, high propylene yield, and easy realization of co-production of polypropylene or other propylene derivatives. It is especially suitable for my country's carbon resource structure with more coal, less gas, and less oil. It has important The application value is an important supplement to my co...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J35/10C01B39/40B82Y30/00B82Y40/00C07C11/06C07C1/20
CPCY02P20/52
Inventor 巩雁军宋宇张兰兰李国栋马通
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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