A kind of hierarchical porous ZSM-5 molecular sieve and its preparation method and the method for preparing MTA catalyst

A ZSM-5, molecular sieve technology, applied in the field of catalyst synthesis, can solve the problem that the self-assembly and dispersion of cationic surfactants and non-ionic surfactants cannot be effectively coordinated and controlled, ZSM-5 molecular sieves are heavily stacked, and are unfavorable for application in the field of catalysis. and other problems, to achieve the effect of easy subsequent separation, obvious synergy, and strong mechanical properties

Active Publication Date: 2019-10-11
REZEL CATALYSTS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ZSM-5 molecular sieve synthesized by this method has serious accumulation and low dispersion
In addition, the particle size of its ZSM-5 molecular sieve is only 500nm, and its hydrothermal stability is poor, which is not conducive to the application in the field of catalysis.
[0008] During the synthesis of hierarchically porous ZSM-5 molecular sieves, the self-assembly and dispersion of cationic surfactants and nonionic surfactants cannot be effectively coordinated and regulated

Method used

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  • A kind of hierarchical porous ZSM-5 molecular sieve and its preparation method and the method for preparing MTA catalyst
  • A kind of hierarchical porous ZSM-5 molecular sieve and its preparation method and the method for preparing MTA catalyst
  • A kind of hierarchical porous ZSM-5 molecular sieve and its preparation method and the method for preparing MTA catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0079] 97.9g of sodium hydroxide, 100.4g of sodium metaaluminate and 1698.0g of deionized water were stirred in a 10L polytetrafluoroethylene bucket to form a mixed solution A. Add 209g of sodium dodecylbenzenesulfonate and 95.5g of ethylene glycol into 1000g of deionized water, and stir to form solution B. Drop the B solution into the mixed solution A at a speed of 110r / min, and stir to form the mixed solution C. Add 2253.0 g of silica sol (40%) and 15 g of nano ZSM-5 seed crystals into C, and continue stirring for 2 h to obtain mixed liquid D. The mixed liquid D was transferred into a 10L stainless steel reaction kettle and sealed, and it took 30min to rise from room temperature to 180°C, and then reacted at 180°C for 8h. The product was centrifuged, washed and dried at 100 °C for 2 h. The product was treated with 1mol / L NH 4 The aqueous Cl solution was exchanged three times at 80 °C, and then dried at 120 °C for 4 h. Finally, the hierarchical porous ZSM-5 molecular siev...

Embodiment 2

[0084] 146.9g of sodium hydroxide, 95.5g of aluminum hydroxide and 1698.0g of deionized water were stirred in a 10L polytetrafluoroethylene bucket to form a mixed solution A. Add 317.2 g of sodium fatty alcohol polyoxyethylene ether sulfate and 91.9 g of isopropanol alcohol into 1000 g of deionized water, and stir to form solution B. Drop solution B into mixed solution A at a speed of 80 r / min, and stir to form mixed solution C. Add 901.2g of white carbon black and 15g of nano ZSM-5 seed crystals into C, and continue to stir for 2h to obtain mixed liquid D. The mixed liquid D was transferred into a 10L stainless steel reaction kettle and sealed, and it took 30min to rise from room temperature to 140°C, and then reacted at 140°C for 16h. The product was centrifuged, washed and dried at 110 °C for 2 h. The product was treated with 1mol / L NH 4 The aqueous Cl solution was exchanged twice at 90°C and then dried at 120°C for 4h. Finally, the hierarchical porous ZSM-5 molecular s...

Embodiment 3

[0089] 49.0 g of sodium hydroxide, 250.1 g of aluminum isopropoxide and 1698.0 g of deionized water were stirred in a 10 L polytetrafluoroethylene barrel to form a mixed liquid A. Add 110.0 g of sodium cetyl sulfonate and 140.9 g of glycerol into 1000 g of deionized water, and stir to form solution B. Drop the B solution into the mixed solution A at a speed of 50r / min, and stir to form the mixed solution C. 3663.4g of water glass (24.6%) and 10g of nano ZSM-5 seed crystals were added to C, and the stirring was continued for 2h to obtain mixed liquid D. The mixed liquid D was transferred into a 10L stainless steel reaction kettle and sealed, and it took 30min to rise from room temperature to 180°C, and then reacted at 180°C for 12h. The product was centrifuged, washed and dried at 110 °C for 2.5 h. The product was treated with 1mol / L NH 4 The aqueous Cl solution was exchanged three times at 80 °C, and then dried at 120 °C for 5 h. Finally, the hierarchical porous ZSM-5 mole...

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Abstract

The invention belongs to the field of catalyst synthesis and in particular relates to a preparation method of a hierarchical porous ZSM-5 molecular sieve. The preparation method comprises the following steps: 1) mixing an alkali source, an aluminum source and water to obtain mixed liquor A; 2) stirring and mixing an anionic surfactant, a dispersing agent and water to obtain mixed liquor B; 3) mixing the mixed liquor A and the mixed liquor B to obtain mixed liquor C; 4) mixing the mixed liquor C, a silicon source and ZSM-5 crystal seeds to obtain mixed liquor D; 5) crystallizing the mixed liquor D at the temperature of 140-180 DEG C, drying, and then washing; and 6) roasting a product obtained after washing in the step 5) at the temperature of 500-600 DEG C, so that the hierarchical porous ZSM-5 molecular sieve is obtained. The preparation method provided by the invention has the advantages that the hierarchical porous ZSM-5 molecular sieve with a hierarchical porous structure and high dispersibility can be simply and successfully synthesized, and life of the hierarchical porous ZSM-5 molecular sieve in MTA reaction is prolonged.

Description

technical field [0001] The invention belongs to the field of catalyst synthesis, and relates to a preparation method of a catalyst applied to MTA reaction, in particular to a ZSM-5 molecular sieve with a hierarchical pore structure and a preparation method thereof. Background technique [0002] The catalysts used in the MTA (methanol to aromatics) reaction mainly have low SiO 2 / Al 2 o 3 ratio of ZSM-5 molecular sieves. Low SiO 2 / Al 2 o 3 Compared with ZSM-5 molecular sieve, due to its strong proton acidity and suitable pore structure, it has excellent catalytic activity and product selectivity for MTA reaction. The ZSM-5 molecular sieve synthesized by the traditional method has a short reaction life due to the existence of carbon deposition in the MTA reaction. The multi-level pore structure (ACS.Catal.2014, 4, 2409-2417) has a multi-channel transmission mode, which improves the anti-coking deactivation and anti-sulfur poisoning ability of the molecular sieve, and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38B01J29/40C07C1/20C07C15/02
Inventor 卓润生翟芳静宋迪燊徐成
Owner REZEL CATALYSTS CORP
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