Nanometer agglomerated disc-like mordenite with different densities

A technology of mordenite and compactness, which is applied in the field of nano-aggregated discoid mordenite, can solve problems such as differences in the density of nano-aggregate discoid mordenite aggregated morphology, and achieves the orderly and regular structure of microporous and mesoporous composite pore structure, and the operation Purposeful, technical and cost controllable effects

Active Publication Date: 2018-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The second technical problem to be solved by the present invention is to overcome the compactness difference of nano-aggregated disc-shaped mordenite in aggregation morphology, and control the synthesis of nano-mordenites with different densities through the optimization of colloidal composition and crystallization conditions discoid aggregates

Method used

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  • Nanometer agglomerated disc-like mordenite with different densities
  • Nanometer agglomerated disc-like mordenite with different densities
  • Nanometer agglomerated disc-like mordenite with different densities

Examples

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Embodiment 1

[0028]Dissolve 180 grams of silica sol in 350 grams of water to form solution A; dissolve 60 grams of aluminum chloride in 300 grams of water to form solution B; dissolve 125 grams of tetraethylammonium bromide in 150 grams of water to form solution A Solution C. Slowly add solution B dropwise to solution A, stir well, then add solution C, and then add a mixture of glycerol, polyethylene glycol PEG-200 and ether with a molar composition of 1:1:1 so that O / SiO 2 = 0.15, by adding 25wt% sodium hydroxide aqueous solution to adjust the pH value of the gel solution to 12, fully stir evenly at room temperature, the formed gel is statically crystallized at 195°C for 30 hours, filtered and dried to obtain molecular sieves sample.

[0029] The SEM morphology of the synthesized samples is as follows figure 1 As shown, it is a disk-shaped sheet-shaped molecular sieve formed by connecting uniform short columnar mordenite nanocrystals with a three-dimensional size of about 250nm, with ...

Embodiment 2

[0031] Dissolve 600 grams of water glass in 350 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 chloride in 150 grams of water to form solution c. Slowly add solution B to solution A, stir well, then add solution C, and then add ethylene glycol to make O / SiO 2 =0.25, by adding 30wt% sodium hydroxide aqueous solution to adjust the pH value of the gel to 11, fully stir evenly at room temperature, the stirring speed of the crystallization process is 80rpm, and the gel is crystallized at 195°C for 24 hours, Filter and dry to obtain a molecular sieve sample.

[0032] The SEM morphology of the synthesized samples is as follows figure 2 As shown, it is a disk-shaped sheet-shaped molecular sieve formed by connecting uniform columnar mordenite nanocrystals with a three-dimensional size of about 100nm, with a thickness of about 100nm and a diameter of about 800-1000nm. image ...

Embodiment 3

[0035] Dissolve 380 grams of silica sol in 350 grams of water to form solution A; dissolve 60 grams of aluminum nitrate in 250 grams of water to form solution B; dissolve 125 grams of tetraethylammonium iodide in 150 grams of water to form solution c. Slowly add solution B to solution A, stir well, then add solution C, and then add PEG-1000 to make O / SiO 2 =0.05, by adding 35wt% sodium hydroxide aqueous solution to adjust the pH value of the gel to 14, fully stir evenly at room temperature, the stirring speed of the crystallization process is 20rpm, and the gel is crystallized at 150°C for 60 hours, Filter and dry to obtain a molecular sieve sample.

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Abstract

The invention relates to nanometer agglomerated disc-like mordenite with different densities. In the prior art, the aggregation density between the nanometer crystals is different when nanometer agglomerated disc-like mordenite spontaneously aggregates to form the special morphology during hydrothermal crystallization. A purpose of the present invention is to mainly overcome the problem in the prior art. The technical scheme comprises that mordenite with a MOR configuration crystallized product is used, the single nanometer mordenite is a short columnar crystal, the three-dimensional size is between 50-600 nm, and the components for glue forming and the hydrothermal crystallization conditions are controlled. With the technical scheme, the problem in the prior art is well solved. Accordingto the present invention, the nanometer agglomerated disc-like mordenite with different densities can be efficiently synthesized.

Description

technical field [0001] The invention relates to a nano-aggregated disc-shaped mordenite with different densities. Background technique [0002] As an efficient solid acid catalyst, mordenite has important industrial application value in petrochemical fields such as adsorption separation, catalytic cracking, disproportionation, transalkylation and isomerization. Synthesis and research on the nanonization of mordenite will help to improve the comprehensive performance of molecular sieve catalysts. In the study of three-dimensional high-crystallinity nano-mordenite crystals, the growth of the ab direction can be relatively easily controlled. Sharma et al. found that spherical mordenite nanocrystals can be effectively synthesized by accelerating nucleation (J Colloid Interface Sci, 2008, 325:547-557). The highly negatively charged polygel in the gelling solution is depolymerized into low negatively charged silicate and aluminate anions under the action of cations, forming crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26B82Y40/00
CPCC01B39/265C01P2004/03C01P2004/61C01P2004/62C01P2004/64C01P2006/14C01P2006/17
Inventor 童伟益孔德金杨德琴祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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