Y-zeolite containing structured ultra-large micropores, and preparation method and application thereof

A microporous, ultra-large technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., which can solve the problems of poor matching

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some catalytic reactions dealing with mesoscale molecules, these secondary constructed mesopores are much larger than the raw material molecules, and the matching for improving the diffusion capacity is poor

Method used

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  • Y-zeolite containing structured ultra-large micropores, and preparation method and application thereof
  • Y-zeolite containing structured ultra-large micropores, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Y zeolite powder was purchased from the market. XRD characterization showed that it had typical FAU zeolite structure characteristics, unit cell parameter 2.460nm; total specific surface area obtained from nitrogen adsorption characterization was 644m 2 / g, the total pore volume is 0.35ml / g, and the pore size in the range of 1-2nm has no contribution from pore volume and specific surface area.

[0038] Take 50g Y zeolite powder, add it to 500ml deionized water, add 10g acetic acid, 5g phosphoric acid and 12g ammonium chloride respectively, treat at 60°C for 4h, filter after cooling, wash and dry to obtain 42g zeolite powder. Add this zeolite to 210g of deionized water, add 25ml of concentrated ammonia water, then dissolve 21g of hexadecyltrimethylammonium bromide, stir at room temperature for 2 hours, then transfer to a self-pressure crystallization kettle, and crystallize at 150°C. After cooling for 48 hours, filter, wash, dry, and roast at 550°C, the Y zeolite contain...

Embodiment 2

[0041] Take 50g Y zeolite powder, add it to 500ml deionized water, add 4.5g oxalic acid, 6.5g hydrochloric acid and 15g ammonium nitrate respectively, treat at 95°C for 2h, filter after cooling, wash and dry to obtain 40g zeolite powder. Add this zeolite to 200g of deionized water, add 2.8g of sodium hydroxide, then dissolve 21g of hexadecyltrimethylammonium chloride, stir at room temperature for 2 hours, then transfer to a self-pressurized crystallization kettle. Crystallize for 48 hours, cool, filter, wash, dry, and bake at 580°C to obtain the Y zeolite with regular ultra-large micropores.

[0042] XRD characterization shows that it has typical FAU zeolite structure characteristics, the unit cell parameter is 2.441nm; the total specific surface area obtained by nitrogen adsorption characterization is 780m 2 / g, the total pore volume is 0.52ml / g. The silicon-aluminum molecular ratio is 37.5. Calculated by the BJH method, it contains ultra-large micropores larger than 1 nano...

Embodiment 3

[0044] Take 50g Y zeolite powder, add it to 500ml deionized water, add 6.8g citric acid, 3.5g sulfuric acid and 17g ammonium sulfate respectively, treat at 90°C for 8h, filter after cooling, wash and dry to obtain 42g zeolite powder. Add this zeolite to 210g of deionized water, add 3.5g of potassium hydroxide, then dissolve 18g of n-dodecylamine and 20ml of ethanol, stir at room temperature for 2 hours, then transfer to a self-pressure crystallization kettle, and crystallize at 160°C After cooling for 20 hours, filter, wash, dry, and roast at 550°C, the Y zeolite with regular ultra-large micropores is obtained.

[0045] XRD characterization shows that it has typical FAU zeolite structure characteristics, the unit cell parameter is 2.433nm; the total specific surface area obtained by nitrogen adsorption characterization is 685m 2 / g, the total pore volume is 0.43ml / g. The silicon-aluminum molecular ratio is 6.8. Calculated by the BJH method, it contains ultra-large micropores...

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Abstract

The invention relates to Y-zeolite containing structured ultra-large micropores, and a preparation method and application thereof. The Y-zeolite has both structured ultra-large micropores with sizes of greater than 1 nm and smaller than 2 nm and lattice micropores with sizes of less than 1 nm.

Description

technical field [0001] The invention relates to a Y zeolite containing regular ultra-large micropores, a preparation method and an application thereof. Background technique [0002] Zeolite materials with highly regular microporous structure, good structural stability and adjustable catalytic active sites are indispensable materials in the modern chemical industry, especially in the fields of catalysis and adsorption. Zeolite Y has As the earliest industrialized microporous molecular sieve, Y zeolite is widely used as a solid acid catalyst, especially in catalytic cracking, hydrocracking and reforming aromatics refining reactions. The micropore channel is less than 0.8nm, and the supercage size is less than 1.3nm, which can provide abundant active sites, shape selectivity and molecular sieving performance for catalytic reactions. On the other hand, these smaller pores create diffusion limitations, especially the restriction of macromolecular feedstocks and products into a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2006/12C01P2006/14C01P2006/16
Inventor 郑均林王月梅孔德金
Owner CHINA PETROLEUM & CHEM CORP
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