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Modified MCM-41 molecular sieve, and modified method

A MCM-41, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problem of poor hydrothermal stability, and achieve the effect of increasing wall thickness, enhancing hydrothermal stability, and making up for lattice defects

Inactive Publication Date: 2008-11-26
BEIJING INST OF CLOTHING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the result that people such as Corma A show in J.catal.1994 148 period 569 pages shows that the thermostability of this class molecular sieve is fairly ideal, but hydrothermal stability is relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 2g of KH570 and dissolve it in 60ml of ethanol, stir evenly, then add 10g of roasted MCM-41 into it, soak for 1 hour, then wash with ethanol for several times, dry at 120°C for 2 hours, then dry at 540°C The modified MCM-41 molecular sieve was obtained by calcining at lower temperature for 6 hours. The test results show that the specific surface area of ​​the sample is 620m 2 / g, the pore volume is 0.48ml / g, and the average pore diameter is 3.1nm. At the same time, the stability time of the sample under water vapor at 350°C is increased from 6 hours to 48 hours.

Embodiment 2

[0023] Weigh 4g of KH570 and dissolve it in 60ml of ethanol, stir evenly, then add 10g of roasted MCM-41 into it, soak for 1 hour, wash with ethanol several times, dry at 120°C for 2 hours, then dry at 540°C The modified MCM-41 molecular sieve was obtained by calcining at lower temperature for 6 hours. The test results show that the specific surface area of ​​the sample is 642m 2 / g, the pore volume is 0.44ml / g, and the average pore diameter is 2.7nm. At the same time, the stability time of the sample under water vapor at 350°C is increased from 6 hours to 54 hours.

Embodiment 3

[0025] Weigh 10g of KH570 and dissolve it in 60ml of ethanol, stir well, then add 10g of roasted MCM-41 into it, soak for 1 hour, then wash with ethanol for several times, dry at 120°C for 2 hours, then dry at 540°C The modified MCM-41 molecular sieve was obtained by calcining at lower temperature for 6 hours. The test results show that the specific surface area of ​​the sample is 622m 2 / g, the pore volume is 0.40ml / g, and the average pore diameter is 2.5nm. At the same time, the stability time of the sample under water vapor at 350°C is increased from 6 hours to 49 hours.

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Abstract

This invention relates to a method for modifying MCM-41 molecular sieve with a layer of Si atoms on its inner surface. The method comprises: (1) adding Si-containing coupler into an organic solvent, and stirring evenly; (2) adding MCM-41 molecular sieve at a weight ratio of 10 : (2-10) to the coupler, and soaking for 1-20 h; (3) washing with an organic solvent for 2-6 times, drying at 100-150 deg.C for 2-20 h, and baking at 450-560 deg.C for 6-16 h to obtain modified MCM-41 molecular sieve. The stable time of the modified MCM-41 molecular sieve in 350 deg.C water vapor can be increased to 48-54 h compared with previous 4-6 h.

Description

technical field [0001] The invention relates to a modified MCM-41 molecular sieve and a modification method thereof. Background technique [0002] "Nature", page 710, issue 359, 1992, Mobil Corporation of the United States reported for the first time that M41S series mesoporous molecular sieves, because of their adjustable pore size of 2-10nm, orderly channel arrangement and high surface area, are excellent in catalysis and adsorption. , Separation and other fields have good application prospects, causing widespread concern. MCM-41 molecular sieve is a member of the M41S series of molecular sieves (MCM is the abbreviation of Mobil Crystalline Material), which has hexagonally arranged pores and a large specific surface area (≥700m 2 / g) is of great interest. However, the results reported by Corma A et al. in J. catal. 1994, No. 148, page 569, show that the thermal stability of this type of molecular sieve is fairly ideal, but the hydrothermal stability is relatively poor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 傅吉全郑岩
Owner BEIJING INST OF CLOTHING TECH
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