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Nano zsm-5 molecular sieve and preparation method thereof

A ZSM-5, molecular sieve technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large amount of template agent, high economic cost, high environmental protection cost, and reduce production. Cost, wide application range, high crystallinity effect

Active Publication Date: 2019-01-11
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of nanometer ZSM-5 molecular sieve, to overcome the problems of large template agent usage, high environmental protection cost and high economic cost in the existing nanometer ZSM-5 molecular sieve preparation technology. Defects, while broadening the application field of ZSM-5 molecular sieve, has obvious economic and social benefits

Method used

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  • Nano zsm-5 molecular sieve and preparation method thereof
  • Nano zsm-5 molecular sieve and preparation method thereof
  • Nano zsm-5 molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-4

[0045] Dissolve 3g CTAB in 414g water and 1000ml EtOH, stir to form a clear night, then add 72ml ammonia water to the above liquid, stir to obtain liquid A; add 10ml TEOS to 440ml EtOH, stir to obtain liquid B; slowly add B dropwise into A, stirred for a certain period of time to obtain a precipitate, centrifuged, dried, and roasted to obtain a precursor, the precursor SEM see figure 1 ; Take 0.5g precursor and put it into the crucible, add 0.36g Al(NO 3 ) 3 9H 2 O(SiO 2 / Al 2 o 3The ratio is 100) and 0.5g of TPAOH, let it stand overnight, put it into an autoclave (25ml of water is stored in advance), and crystallize at 110°C for 24h (Example 1), 96h (Example 2), 144h (Example 3 ) and 192h (Example 4), the resulting product was dried at 120°C and calcined at 550°C to obtain a nanometer ZSM-5 molecular sieve, whose XRD spectrum is shown in figure 2 , the product SEM picture that embodiment 1 is worth sees image 3 . Wherein, the diameters of nano ZSM-5 molecular sieves...

Embodiment 5

[0047] The amount of ethanol is reduced to 144ml, while the amount of CTAB is changed to 6g, others are the same as in Example 2, and the resulting product is dried and roasted to obtain nanometer ZSM-5 molecular sieves, and its XRD spectrum is shown in Figure 4 . The diameter of nano ZSM-5 molecular sieve is 250nm.

Embodiment 6

[0049] The amount of ethanol is reduced to 72ml, and the amount of ammonia water is adjusted to 36ml, and others are the same as in Example 3, and the resulting product is dried and roasted to obtain nanometer ZSM-5 molecular sieves, and its XRD spectrum is shown in Figure 4 . The diameter of nano ZSM-5 molecular sieve is 300nm.

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Abstract

The invention provides a nano ZSM-5 (Zeolite Socony Mobil-5) molecular sieve and a preparation method thereof. The nano ZSM-5 molecular sieve is at least prepared from the following components in a mole ratio: 0.2 to 0.3 of silicon source, 0.038 to 0.08 of cationic surfactant, 1.55 to 11.5 of alcohol, 0.06 to 4.5 of ammonia water, 0.00014 to 0.00084 of aluminum source, 0.034 to 0.14 of TPAOH (Tetrapropylammonium Hydroxide) and 83 to 95 of water. According to the method, a crystal seed is not needed in the method; used dispersing agent, surfactant and water are all reduced greatly; therefore, the method is more economical.

Description

technical field [0001] The invention relates to a nanometer ZSM-5 molecular sieve and a preparation method thereof, belonging to the field of chemical industry. Background technique [0002] Nano ZSM-5 molecular sieve (<500nm) not only has the pore structure of conventional ZSM-5 molecular sieve, but also has the volume effect, surface effect and quantum size effect of nanoparticles. In particular, its pores are short, and the acid sites on the outer surface account for a large proportion of the total acid content. The acid content on the outer surface of nanometer HZSM-5 [(50-500)nm] accounts for more than 30% of the total acid quantity, while that of micron HZSM-5 -5 The acid content on the outer surface is only about 3% of the total acid content. Nano ZSM-5 molecular sieve has a large number of intercrystalline pores, has strong anti-coking deactivation and anti-sulfur poisoning ability, and is a catalytic material with wide application prospects. [0003] Common met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B39/40C01P2002/72C01P2004/03C01P2004/62C01P2004/64
Inventor 胡胜伟刘子玉杨承广丘明煌陈新庆曾高峰孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI