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Molecular sieve forming product and preparation method thereof

A technology of molecular sieves and moldings, which is applied in the field of molecular sieves to achieve the effect of improving utilization and reducing water consumption

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for ZSM-5 / AlPO 4 -5 Composite molecular sieves have not yet been reported to prepare their binder-free moldings

Method used

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  • Molecular sieve forming product and preparation method thereof
  • Molecular sieve forming product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix ZSM-5 molecular sieve with a molar ratio of silicon to aluminum of 50 and pseudoboehmite at a weight ratio of 3:1, add 19.2 grams of 85% orthophosphoric acid and 30 mL of distilled water, and stir well; add 6.4 grams of triethylamine, stir uniform. Kneading, extrusion molding. Put into the crystallization kettle. Hydrothermal crystallization at 125°C for 6 hours. Next, hydrothermal crystallization was carried out at 160° C. for 24 hours. Take it out and bake it at 580°C. Sampling, pulverization and characterization. XRD characterization results show that (see figure 1 ), in addition to the ZSM-5 crystal form, there are AlPO 4 -5 crystal form appears; SEM characterization results show that there are small particles attached to the surface of block ZSM-5 (see figure 2 ).

Embodiment 2

[0030] Mix ZSM-5 molecular sieve with a molar ratio of silicon to aluminum of 50 and pseudoboehmite at a weight ratio of 4:1; add 3.6 grams of triethylamine and 30 mL of distilled water, and stir well; add 9.65 grams of 85% orthophosphoric acid, and stir uniform. Kneading, extrusion molding. Put into the crystallization kettle. Hydrothermal crystallization at 150°C for 4 hours. Next, hydrothermal crystallization was carried out at 200° C. for 10 hours. Take it out and bake it at 580°C to obtain a bar-shaped molecular sieve.

Embodiment 3

[0032] Mix ZSM-5 molecular sieve with a silicon-aluminum molar ratio of 50 and pseudoboehmite at a weight ratio of 5:1, add 19.6 grams of 85% orthophosphoric acid, and stir evenly; add 8.1 grams of triethylamine and 10 mL of distilled water, and stir uniform. Kneading, extrusion molding. Put into the crystallization kettle. Hydrothermal crystallization at 100°C for 24 hours. Then, hydrothermal crystallization was carried out at 150° C. for 48 hours. Take it out and bake it at 580°C to obtain a bar-shaped molecular sieve.

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PUM

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Abstract

The invention relates to a molecular sieve forming product and a preparation method thereof, and solves a technical problem, namely the utilization rate reduction of molecular sieve pore channels due to addition of binders in forming processes. A ZSM-5 molecular sieve, solid powder inorganic silica, orthophosphoric acid and a template agent are mixed, extruded into bars and formed or applied to a shaped object, subjected to hydrothermal crystallization at 100-150 DEG C for 4-48 h, and subjected to hydrothermal crystallization at 150-200 DEG C for 10-120 h. The binder-free forming product comprises the ZSM-5 molecular sieve, AlPO4-5 molecular sieve and amorphous alumina having a mass content lower than 10%. The product can be used in catalyzing, absorbing and separating processes.

Description

technical field [0001] The invention relates to the field of molecular sieves, in particular to a molecular sieve molding and a preparation method thereof, more specifically to a ZSM-5 / AlPO 4 -5 A binder-free molding of a molecular sieve with a composite core-shell structure and a preparation method thereof. Background technique [0002] Molecular sieves are widely used in the fields of catalysis and adsorption separation because of their uniform and ordered micropores, large specific surface area and high hydrothermal stability. ZSM-5 molecular sieve is used in many fields because of its unique pores. AlPO 4 -5 molecular sieves have attracted attention due to their large pores and unique catalytic properties. ZSM-5 / AlPO 4 -5 composite core-shell structure molecular sieve with ZSM-5 and AlPO in the inner core and outer layer, respectively 4 The acidity and channel characteristics of -5 molecular sieves. When this material is used as a catalyst, the characteristics of t...

Claims

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Application Information

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IPC IPC(8): C01B39/38C01B39/54
Inventor 吉媛媛
Owner CHINA PETROLEUM & CHEM CORP
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