MTW zeolite and preparation method thereof

A zeolite, ay2o3 technology, applied in the field of MTW zeolite with new structure and its preparation, can solve the problems of large diffusion resistance, carbon deposition catalyst, deactivation and other problems, and achieve the effects of uniform crystal grains, high mechanical strength and regular morphology

Inactive Publication Date: 2014-07-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the MTW zeolite used in the industry is mostly irregular in appearance, and the crystal grains are not uniform, which leads to the one-dimensional ten-membered ring pore structure is often distributed disorderly. When used for catalytic reactions, the reactant or product molecules are in the zeolite crystal. The diffusion resistance is relatively large, which can easily cause carbon deposition in deep reactions and accelerate the deactivation of the catalyst.

Method used

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  • MTW zeolite and preparation method thereof
  • MTW zeolite and preparation method thereof
  • MTW zeolite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Prepare the initial gel in the following molar ratios: SiO 2 / Al 2 o 3 =30,OH - / SiO 2 =0.4, R / SiO 2 =0.2, H 2 O / SiO 2 =30 ratio, sodium aluminate, sodium hydroxide, 1,5-(N-methylpyrrolyl)pentane bromide were dissolved in deionized water, and then white carbon black was added under constant stirring. Afterwards, the above mixture was charged into a 100 ml crystallization kettle and reacted at 160° C. for 168 hours.

[0022] The cooled reaction solution was placed in a water bath for 5 hours, and after obvious layering, the beige solid in the lower layer was MTW zeolite, which was separated, washed, dried, and roasted and then analyzed by XRD to confirm that it was a hexagonal phase MTW zeolite, the molar ratio of silica to aluminum is 10.4; characterized by SEM, the particle size is 10 μm, the thickness is about 2 μm, the number is MTW-1, and the yield of MTW-1 is 90% based on the weight of silicon dioxide fed. %.

Embodiment 2

[0023] Example 2 Prepare the initial gel in the following molar ratios: SiO 2 / Al 2 o 3 =60,OH - / SiO 2 =0.3, R / SiO 2 =0.25, H 2 O / SiO 2 =30 ratio, sodium aluminate, sodium hydroxide, 1,6-(N-methylpyrrolyl)hexane bromide were dissolved in deionized water, and then white carbon black was added under constant stirring. Afterwards, the above mixture was charged into a 100 ml crystallization kettle and reacted at 175° C. for 96 hours.

[0024] The cooled reaction solution was placed in a water bath for 10 hours, and after obvious stratification, the beige solid in the lower layer was MTW zeolite, which was separated, washed, dried, and calcined. After XRD analysis, it was confirmed to be a hexagonal phase MTW zeolite, the molar ratio of silica to aluminum is 22; characterized by SEM, the particle size is 9 μm, the thickness is about 3 μm, the number is MTW-2, and the yield of MTW-2 is 93 %.

Embodiment 3

[0025] Example 3 Prepare the initial gel in the following molar ratios: SiO 2 / Al 2 o 3 =120,OH - / SiO 2 =0.5, R / SiO 2 =0.16, H 2 O / SiO 2 =15 ratio, sodium aluminate, sodium hydroxide, the above organic template were dissolved in deionized water, silicic acid was added without stirring, and then the above mixture was put into a 100 ml crystallization kettle at 160 °C for 120 hours.

[0026] The cooled reaction solution was placed in a water bath for 10 hours, and after obvious stratification, the beige solid in the lower layer was MTW zeolite, which was separated, washed, dried, and calcined. After XRD analysis, it was confirmed to be a hexagonal phase MTW zeolite, the molar ratio of silica to aluminum is 83; characterized by SEM, the particle size is 7.5 μm, the thickness is about 2 μm, the number is MTW-3, and the yield of MTW-3 is 89% based on the weight of silicon dioxide fed. %.

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Abstract

The invention belongs to the technical field of inorganic materials, and in particular discloses MTW zeolite with a novel structure and a preparation method thereof. The method adopts a hydro-thermal synthesis method and comprises the following steps: mixing a silicon source, an aluminum source, an alkali source, an organic template and a water phase, and stirring to be a gel mixture as a raw material for synthesizing the MTW zeolite. The MTW zeolite with the novel structure has the chemical composition of TO2:aY2O3:bM2 / nO, wherein T represents at least one quadrivalent element, Y represents at least one trivalent element, M represents at least one alkali metal (or) alkaline-earth metal element and has the valence state of n, a and b respectively represent the mole numbers of T2O3 and M2 / nO, a ranges from 0 to 1, and b ranges from 0 to 0.8. The MTE zeolite prepared by using the method is tidy in morphology and uniform in crystal granule; compared with the conventional disordered MTW zeolite, the MTE zeolite has the advantages of fixed mass transfer orientation, high activity, high mechanical strength and the like, and can be widely applied to the chemical industry.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a MTW zeolite with a new structure and a preparation method thereof. Background technique [0002] MTW zeolite is a microporous crystalline zeolite with a one-dimensional ten-membered ring channel structure. At the same time, MTW zeolite also has high thermal stability, hydrothermal stability and adjustable acidity. Therefore, MTW zeolite shows high practical value in alkylation, toluene disproportionation and long chain alkane isomerization. [0003] At present, the MTW zeolite used in the industry is mostly irregular in appearance, and the crystal grains are not uniform, which leads to the one-dimensional ten-membered ring pore structure is often distributed disorderly. When used for catalytic reactions, the reactant or product molecules are in the zeolite crystal. The diffusion resistance of the catalyst is relatively large, which can easily cause dee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 唐颐王磊张宏斌吕新春
Owner FUDAN UNIV
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