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Nano-aggregated sheet-shaped mordenite

A technology of mordenite and mordenite, which is applied in the field of nano-aggregated sheet-shaped mordenite, can solve the problems of reducing the mass transfer rate of catalytic reactions, unfavorable catalytic activity, and agglomeration of nano-zeolite crystals into spherical shapes, achieving crystallinity and stability. Improve the effect of mass transfer and diffusion performance, regularity and patency improvement

Active Publication Date: 2020-09-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention relates to the synthesis of a nano-aggregated sheet-shaped mordenite, mainly to overcome the phenomenon that conventional nano-zeolite crystals are easily agglomerated into spherical shapes due to high surface energy, which seriously reduces the mass transfer rate in the catalytic reaction process, which is not conducive to catalysis more active

Method used

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  • Nano-aggregated sheet-shaped mordenite
  • Nano-aggregated sheet-shaped mordenite
  • Nano-aggregated sheet-shaped mordenite

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 360 ​​grams of silica sol (Ludox-40) in 500 grams of water to form solution A; dissolve 60 grams of aluminum sulfate in 250 grams of water to form solution B; dissolve 125 grams of tetraethylammonium bromide in 150 grams of In water, configure solution C. Solution B is slowly added dropwise in solution A, fully stirs, then adds solution C, then adds 30 milliliters of methyl alcohol (AR), adjusts the pH value that becomes glue to be 13 by adding 20wt% sodium hydroxide aqueous solution, in Stir well and evenly at room temperature, and crystallize the formed gel at 195° C. for 30 hours, filter and dry to obtain a molecular sieve sample.

[0031] The SEM morphology of the synthesized samples is as follows figure 1 As shown, it is a disk-shaped molecular sieve formed by connecting uniform columnar mordenite nanocrystals with a three-dimensional size of about 100 nm, with a thickness of about 100 nm and a diameter of about 800-1000 nm.

Embodiment 2

[0033] Dissolve 175 grams of activated clay in 350 grams of water to make solution A; dissolve 20 grams of alumina in 300 grams of water to make solution B; slowly add solution B to solution A, stir well, and add 180 grams Tetraethylammonium hydroxide (40%) solution, then add 26 milliliters of 1,2-propanediol and 4 milliliters of methyl ethers, adjust the pH value of the gel solution by adding 50wt% sodium hydroxide aqueous solution to be 11, at room temperature Stir well and evenly at 180°C for 60 hours to form a gel, filter and dry to obtain a molecular sieve sample.

Embodiment 3

[0035] Dissolve 600 grams of ethyl orthosilicate in 350 grams of water to form solution A; dissolve 65 grams of aluminum chloride in 300 grams of water to form solution B; dissolve 136 grams of tetraethylammonium bromide in 150 grams of water , configured as solution C. Slowly add solution B dropwise to solution A, stir well, then add solution C, then add 32 milliliters of ethanol, adjust the pH value of the gel solution by adding 10wt% sodium hydroxide aqueous solution to 14, at room temperature Stir well and evenly, the formed gel is at 180 o ℃ for 18 hours, filtered and dried to obtain a molecular sieve sample.

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Abstract

The invention relates to synthesis of nanometer agglomerated sheet-shaped mordenite. In the prior art, during the synthesis of the conventional nanometer molecular sieve, a plurality of nanometer crystals are easily agglomerated to form spheres and other block-like aggregates due to the high surface energy, such that the diffusion speed is slow and the diffusion channel is not smooth in the actualapplication so as to seriously affect the reaction performance of the nanometer molecular sieve and affect the stability of the nanometer molecular sieve. A purpose of the present invention is to mainly overcome the problem in the prior art. According to the present invention, the nanometer agglomerated sheet-shaped mordenite can be efficiently synthesized by adding a small amount of the oxygen-containing organic solvent through the structure-directing action of the organic templating agent tetraethylammonium cation, wherein the composition and the dissociation equilibrium of the silicon-aluminum gel are controlled through the concentration of the tetraethylammonium radical in the synthesis system; and the nanometer agglomerated sheet-shaped mordenite synthesized through the technical scheme can be used for adsorption separation, catalytic conversion in petrochemical industry, and other fields.

Description

technical field [0001] The invention relates to a nano-aggregated sheet-shaped mordenite. Background technique [0002] As one of the earliest zeolites recognized by humans, mordenite is a crystalline aluminosilicate with special acid distribution and regular mass transfer channels. And other petrochemical fields have important industrial application value. Mordenite crystals have a strong c-axis growth potential, which causes their channels to be too long along the 12MR direction, seriously affecting their mass transfer and diffusion efficiency. Reducing the size of molecular sieves to the nanoscale is an effective method to increase the external specific surface area of ​​molecular sieves and increase the mass transfer rate. Compared with micron-sized molecular sieves, the advantages of nano-sized molecular sieves are: (1) Larger specific surface area, more active centers, High surface energy, active unsaturated bonds on the outer surface, easy to adsorb molecules, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/26B82Y30/00
CPCC01B39/265C01P2004/03C01P2004/45C01P2004/62C01P2004/64C01P2006/12
Inventor 童伟益孔德金李经球李华英祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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