Nanometer molecular sieve, synthetic method and applications thereof

A technology of nano-molecular sieve and synthesis method, which is applied in the field of nano-molecular sieve and its synthesis, which can solve the problems of small specific surface area, large particle size, and unfriendly environment, and achieve the effect of large specific surface area, small particle size, and environmental friendliness

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the problems existing in the prior art such as high synthesis cost of molecular sieves, unfriendly to the environment, large particle size, small specific surface area, poor adsorption performance in the presence of water vapor, etc.

Method used

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  • Nanometer molecular sieve, synthetic method and applications thereof
  • Nanometer molecular sieve, synthetic method and applications thereof
  • Nanometer molecular sieve, synthetic method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 40 grams of silica sol (40%), 5 milliliters of ammonia, 2 grams of sodium hydroxide and 50 milliliters of deionized water were mixed and stirred at room temperature for 1 hour to form solution A, 0.5 grams of aluminum nitrate and 30 milliliters of water were stirred and dissolved to form solution B. Solution A was slowly added to solution B and stirred vigorously for 2 hours to obtain mixture C.

[0051] Take out 10% of mixture C, age at 100°C for 5 hours, add the remaining mixture C and 65 ml of ammonia water, stir vigorously for 2 hours, transfer this mixed system into a stainless steel crystallization kettle, and crystallize at 190°C for 12 hours , obtained crystallized powder D after rapid cooling, filtration, washing and drying.

[0052] The obtained D powder was calcined at 500°C in a 100% water vapor atmosphere for 5. The XRD pattern of the obtained sample had the characteristic diffraction peak of ZSM-5 zeolite molecular sieve. The particle size of the molecular...

Embodiment 2

[0054] 4 grams of white carbon black, 2.5 milliliters of ammonia water, 1 gram of sodium hydroxide and 50 milliliters of deionized water were mixed, stirred at room temperature for 1 hour, and aged at 60° C. for 24 hours to obtain a mixture A.

[0055] 25 grams of tetraethyl orthosilicate, 20 milliliters of ammonia water, 1.5 grams of sodium hydroxide, 1.5 grams of aluminum sol (30%) and 20 grams of deionized water were mixed, stirred at room temperature for 24 hours to obtain mixture B,

[0056] Mix A and B, add 25 ml of ammonia water, stir vigorously for 2 hours, transfer the mixed system into a stainless steel crystallization kettle, crystallize at 190°C for 12 hours, and obtain crystallized powder C by quenching, filtering, washing, and drying.

[0057] The obtained C powder was calcined at 650°C for 10 hours in an air atmosphere containing 10% water vapor. The XRD pattern of the obtained sample had the characteristic diffraction peak of ZSM-5 zeolite molecular sieve, the p...

Embodiment 3

[0059] Stir 25 grams of deionized water, 5.2 grams of ammonia water, and 2.3 grams of aluminum isopropoxide until the solution becomes clear, add 1.5 grams of white carbon black, heat to 40° C. for 15 hours, and add 0.03 grams of sodium hydroxide. Crystallize at 120°C under autogenous pressure for 15 hours, cool, centrifuge, wash and dry to obtain a white powder, first calcined at 600°C for 15 hours in a nitrogen atmosphere, and then calcined at 700°C for 5 hours in a 100% water vapor atmosphere. The obtained XRD pattern has the characteristic diffraction peak of Y zeolite molecular sieve, the particle size is about 60nm, and the BET specific surface area is 800m 2 / g, the ratio of silicon to aluminum is 10.8.

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Abstract

The invention provides a high-specific-surface-area nano zeolite molecular sieve capable of being directly synthesized without using organic amine or a seed crystal or a guiding agent, and a synthesismethod thereof. A purpose of the invention is to mainly solve the problems of small specific surface area, high cost and unfriendliness to the environment due to the fact that most of nano zeolite molecular sieves are synthesized by using organic amines in the prior art. According to the invention, inorganic ammonium or inorganic alkali is used for replacing organic amine, and the parameters in the synthesis process of the molecular sieve are optimized, so that the nano molecular sieve with the grain size of less than 200 nm is obtained, the specific surface area is 300-800 m<2>/g, and the synthesis method is good in repeatability, low in synthesis cost, simple to operate and environment-friendly, and can be applied to the industrial fields of catalysis, adsorption separation, drying purification and the like.

Description

technical field [0001] The invention relates to a nano molecular sieve and its synthesis method and application, in particular to a nano molecular sieve with high specific surface area and high hydrophobicity which can be directly prepared without using organic amine or seed crystal or directing agent. Background technique [0002] At present, the grain size of zeolite molecular sieves commonly used in industry is mostly 1-5 μm. When the grain size of molecular sieves is reduced from micron to nanometer, certain physical and chemical properties of molecular sieves, such as catalytic performance, thermal stability and adsorption performance, will be affected. Both will have obvious and beneficial effects, and have shown excellent performance in the fields of catalysis, adsorption separation, purification and drying, etc. in-depth research. [0003] Generally speaking, nano-molecular sieves are synthesized by hydrothermally treating silica-alumina gel at a certain time and te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B37/00B82Y40/00B01J20/18B01J20/30B01D53/02C07C15/06C07C2/86B01J29/40B01J29/08B01J29/18
CPCC01B39/02C01B37/00B82Y40/00B01J20/18B01D53/02C07C2/864B01J29/40B01J29/084B01J29/18B01D2258/06B01D2257/70B01D2257/7027B01D2257/708C07C2529/40C07C2529/08C07C2529/18C01P2006/12C01P2004/64C01P2004/62C01P2004/04C07C15/06Y02P20/50
Inventor 邹薇任淑滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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