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Synthesis method of ultrathin nanosheet molecular sieve with mww structure

A synthesis method and technology of molecular sieves, applied in molecular sieves and base exchange compounds, molecular sieve catalysts, including molecular sieve catalysts, etc., can solve the problems of serious pollution and high cost of ultra-thin nanosheet molecular sieves, and achieve low boiling point, low price and controllability Good results

Active Publication Date: 2021-10-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that conventionally synthesized MWW structure ultra-thin nanosheet molecular sieves have high cost and serious pollution.

Method used

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  • Synthesis method of ultrathin nanosheet molecular sieve with mww structure
  • Synthesis method of ultrathin nanosheet molecular sieve with mww structure
  • Synthesis method of ultrathin nanosheet molecular sieve with mww structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 12.64 grams are dissolved in 362.40 grams of water, then add organic template under the situation of stirring: 32.1 grams of hexamethyleneimine (99.0% by weight), 54 grams of cyclohexane, finally add silica sol (SiO 2 40.0% by weight) 240 grams, the material proportion (mol ratio) of reactant is:

[0030] SiO 2 / Al 2 o 3 =30

[0031] NaOH / SiO 2 =0.09

[0032] Hexamethyleneimine / SiO 2 =0.2

[0033] Cyclohexane / SiO 2 =0.40

[0034] h 2 O / SiO 2 =19.2

[0035] After mixing evenly, put it into a stainless steel reaction kettle, and crystallize at 150° C. for 4 days under the condition of stirring. After the crystallization is completed, filter, wash, and dry to obtain a molecular sieve precursor, and then roast the precursor in air at 550° C. for 5 hours to obtain a silicon-aluminum molecular sieve. The thickness in the c-axis direction of the crystal is about 5 nanometers.

[0036] The XRD spect...

Embodiment 2

[0041] Sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 12.64 grams are dissolved in 362.40 grams of water, then add the organic template under the situation of stirring: 32.1 grams of hexamethyleneimine (99.0% by weight), 81 grams of cyclohexane, finally add silica sol (SiO 2 40.0% by weight) 240 grams, the material proportion (mol ratio) of reactant is:

[0042] SiO 2 / Al 2 o 3 =30

[0043] NaOH / SiO 2 =0.09

[0044] Hexamethyleneimine / SiO 2 =0.2

[0045] Cyclohexane / SiO 2 =0.60

[0046] h 2 O / SiO 2 =19.2

[0047] After mixing evenly, put it into a stainless steel reaction kettle, and crystallize at 150° C. for 4 days under the condition of stirring. After the crystallization is completed, filter, wash, and dry to obtain a molecular sieve precursor, and then roast the precursor in air at 550° C. for 5 hours to obtain a silicon-aluminum molecular sieve.

[0048] The XRD spectrogram data of the product silica-alumina molecular sieve is shown in Tab...

Embodiment 3

[0053] Sodium aluminate (Al 2 o 3 43.0 wt%, Na 2 O 35.0% by weight) 12.64 grams are dissolved in 362.40 grams of water, then add the organic template under the situation of stirring: 32.1 grams of hexamethyleneimine (99.0% by weight), 60 grams of cycloheptane, finally add silica sol (SiO 2 40.0% by weight) 240 grams, the material proportion (mol ratio) of reactant is:

[0054] SiO 2 / Al 2 o 3 =30

[0055] NaOH / SiO 2 =0.09

[0056] Hexamethyleneimine / SiO 2 =0.2

[0057] Cycloheptane / SiO 2 =0.37

[0058] h 2 O / SiO 2 =19.2

[0059] After mixing evenly, put it into a stainless steel reaction kettle, and crystallize at 150° C. for 4 days under the condition of stirring. After the crystallization is completed, filter, wash, and dry to obtain a molecular sieve precursor, and then roast the precursor in air at 550° C. for 5 hours to obtain a silicon-aluminum molecular sieve.

[0060] The XRD spectrogram data of the product silica-alumina molecular sieve is shown in T...

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Abstract

The invention relates to a method for synthesizing molecular sieve nanosheets with MWW structure. The synthesis method includes the step of introducing an organic additive into a synthesis system of a conventional MWW structure molecular sieve, and the organic additive is selected from at least one of alkanes, naphthenes, and aromatic hydrocarbons. The method has low raw material cost, is easy to recycle, does not contain heteroatoms such as N, has the characteristics of economy, environmental protection, and easy industrial application, and solves the problem of high cost in the existing method.

Description

technical field [0001] The invention relates to a method for synthesizing ultra-thin nano sheet molecular sieves with MWW structure. Background technique [0002] In industry, porous inorganic materials are widely used as catalysts and catalyst supports. Porous materials have relatively high specific surface area and smooth pore structure, so they are good catalytic materials or catalyst supports. Porous materials generally include: amorphous porous materials, crystalline molecular sieves, and modified layered materials. Subtle differences in the structure of these materials portend significant differences in their own catalytic and adsorption properties of the materials, as well as differences in the various observable properties used to characterize them, such as their morphology, specific surface area, porosity dimensions and the variability of those dimensions. [0003] The basic framework structure of crystalline microporous zeolites is based on the rigid three-dimen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48C07C2/66C07C15/073B01J29/70
CPCB01J29/7038C01B39/48C01P2002/60C01P2002/72C01P2002/74C07C2/66C07C2529/70C07C15/073
Inventor 王振东杨为民罗翼陶伟川
Owner CHINA PETROLEUM & CHEM CORP