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Synthesis method of discoid mordenite with different thickness

A technology of mordenite and synthesis method, which is applied in the direction of mercerized crystalline aluminosilicate zeolite, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problem of unfavorable catalytic activity, agglomeration of nano-zeolite crystals into spherical shapes, and reduction of catalytic reaction transmission. Mass rate and other issues, to achieve the effect of improving mass transfer and diffusion performance, improving regularity and smoothness, crystallinity and stability

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The invention relates to the synthesis of a nano-aggregated disc-shaped mordenite, mainly to overcome the phenomenon that conventional nano-zeolite crystals are easily agglomerated into a spherical shape 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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  • Synthesis method of discoid mordenite with different thickness
  • Synthesis method of discoid mordenite with different thickness
  • Synthesis method of discoid mordenite with different thickness

Examples

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Embodiment 1

[0031] Dissolve 600 grams of water glass in 350 grams of water to form solution A; dissolve 65 grams of aluminum nitrate in 300 grams of water to form solution B; dissolve 125 grams of tetraethylammonium bromide in 150 grams of water to form solution c. Slowly add solution B to solution A dropwise, stir well and pour into solution C. Subsequently, AEO and dimethyl sulfone mixed oxygen-containing organic compounds with a molar ratio of 1:1 were added, so that the O / SiO 2 = 0.15, adjust the pH value of the gel solution with 95%wt concentrated sulfuric acid to 13, stir well at room temperature, and crystallize the formed gel at 180°C for 18 hours, filter and dry to obtain a molecular sieve sample, and synthesize the sample The SEM morphology of figure 1 shown.

Embodiment 2

[0033] Dissolve 600 grams of water glass in 350 grams of water to form solution A; dissolve 65 grams of aluminum nitrate in 300 grams of water to form solution B; dissolve 125 grams of tetraethylammonium bromide in 150 grams of water to form solution c. Slowly add solution B to solution A dropwise, stir well and pour into solution C. Subsequently, AEO and dimethyl sulfone mixed oxygen-containing organic compounds with a molar ratio of 1:1 were added, so that the O / SiO 2 =0.005, adjust the pH value of the gel solution with 95%wt concentrated sulfuric acid to 13, stir well at room temperature, and crystallize the formed gel at 180°C for 18 hours, filter and dry to obtain a molecular sieve sample, and synthesize the sample The SEM morphology of image 3 shown.

Embodiment 3

[0035] Dissolve 600 grams of water glass in 350 grams of water to form solution A; dissolve 65 grams of aluminum nitrate in 300 grams of water to form solution B; dissolve 125 grams of tetraethylammonium bromide in 150 grams of water to form solution c. Slowly add solution B to solution A dropwise, stir well and pour into solution C. Subsequently, AEO and dimethyl sulfone mixed oxygen-containing organic compounds with a molar ratio of 1:1 were added, so that the O / SiO 2 = 0.3, adjust the pH value of the gel solution with 95%wt concentrated sulfuric acid to 13, stir well at room temperature, and crystallize the formed gel at 180°C for 18 hours, filter and dry to obtain a molecular sieve sample, and synthesize the sample The SEM morphology of Figure 4 shown.

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Abstract

The invention relates to synthesis of disc-like mordenite with different thickness. In the prior art, in the conventional nanometer molecular sieve synthesis process, a plurality of nanometer crystalsare 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 actual application 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 mainlyovercome the problem in the prior art. According to the present invention, the nanometer agglomerated disc-like mordenite can be efficiently synthesized by adding the oxygen-containing organic solventthrough the structure-directing action of the organic templating agent tetraethylammonium cation, and the disc-like mordenite with different thickness can be obtained by adding the oxygen-containingorganic substances with different volumes; and the obtained disc-like mordenite can be used for catalysis and adsorption separation in industrial production.

Description

technical field [0001] The invention relates to the synthesis of a disc-shaped mordenite with different thicknesses. Background technique [0002] Mordenite has a strong growth potential along the 12MR (twelve-membered ring channel) direction of the c-axis, so it is usually easy to obtain two-dimensional mordenite nanorod crystals, that is, orthorhombic biconical crystals, D2h-mmm (3L23PC ), the crystals are needle-shaped or fibrous along the extension of the c-axis, and the aggregates are radial, fascicular, fibrous, etc. For example, Zhang et al. found that a series of fibrous, rod-shaped, prismatic and needle-shaped two-dimensional mordenite nanocrystals were obtained by adjusting the synthesis ratio under the condition of no organic template (Materials Research Bulletin, 2011, 46: 894-900); Ren et al. found that due to the anisotropy of mordenite crystals with this type of morphology, oriented growth tends to lead to the formation of oriented disc-like aggregates (J Mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/26
CPCC01B39/265C01P2004/03C01P2004/24C01P2006/12
Inventor 孔德金童伟益祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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