ZSM-35 molecular sieve and preparation method thereof

A technology of ZSM-35 and molecular sieves, which is applied in the field of preparation of molecular sieve catalysts, can solve problems such as ZSM-35 molecular sieves that have not been seen and have not yet been synthesized, so as to facilitate diffusion and mass transfer, improve conversion efficiency and isomerization selectivity, The effect of green environmental protection in the preparation process

Active Publication Date: 2018-11-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, in the existing technology of ZSM-35 molecular sieve, there is no relevant report about aggregated ZSM-35 molecular sieve with large-meso-micro m...

Method used

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  • ZSM-35 molecular sieve and preparation method thereof
  • ZSM-35 molecular sieve and preparation method thereof
  • ZSM-35 molecular sieve and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0084] Dissolve 1.415g of potassium hydroxide with a purity of 95wt.% in 20g of deionized water, stir evenly, add 1.23g of sodium metaaluminate with a purity of 80wt.%, stir until clear and transparent, and at the same time, dissolve with 10g of deionized water 2.088g of dipotassium hydrogen phosphate with a purity of 95wt.% was added dropwise to the above-mentioned clear and transparent solution, continued to stir for 15min, and then 24g of 30wt.% (as SiO 2 Calculate, the same below) silica sol, add a small amount of deionized water after the silica sol is added dropwise, and stir vigorously for 30 minutes to obtain the reactant gel. The molar ratio of each component in the reactant gel is about: 1.5Na 2 O: 4K 2 O: 20SiO 2 : 1Al 2 o 3 : 2HPO 4 2- : 600H 2 O.

[0085] Under the condition of stirring, the reactant gel is aged at about 25° C. for about 4 hours to prepare the reactant gel precursor.

[0086] The reactant gel precursor was transferred to a 100mL reaction ...

Embodiment 2

[0093] Dissolve 1.415g of potassium hydroxide with a purity of 95wt.% in 20g of deionized water, stir evenly, add 1.23g of sodium metaaluminate with a purity of 80wt.%, stir until clear and transparent, and at the same time, dissolve 1.044 g of dipotassium hydrogen phosphate with a purity of 95wt.% and 0.894g of potassium chloride with a purity of 98wt.% were added dropwise to the above-mentioned clear and transparent solution, stirred for 15 min, and then 24 g of a concentration of 30wt.% was added dropwise to the solution After the silica sol was added dropwise, a small amount of deionized water was added, and vigorously stirred for 30 minutes to obtain a reactant gel. The molar ratio of each component in the reactant gel is about: 1.5Na 2 O: 4K 2 O: 20SiO 2 : 1Al 2 o 3 : 1HPO 4 2- : 600H 2 O.

[0094] Under the condition of stirring, the reactant gel is aged at about 40° C. for about 2 hours to prepare the reactant gel precursor.

[0095] The reactant gel precursor...

Embodiment 3

[0100] Dissolve 0.825g of potassium hydroxide with a purity of 95wt.% in 20g of deionized water, stir evenly, add 0.718g of sodium metaaluminate with a purity of 80wt.%, stir until clear and transparent, at the same time, dissolve 1.218 g of dipotassium hydrogen phosphate with a purity of 95wt.%, was added dropwise to the above-mentioned clear and transparent solution, stirred for 15 min, and then 14 g of silica sol with a concentration of 30wt.% was added dropwise in the solution, and after the addition of the silica sol was completed, the A small amount of deionized water was added and vigorously stirred for 30 min to obtain a reactant gel. The molar ratio of each component in the reactant gel is about: 1.5Na 2 O: 4K 2 O: 20SiO 2 : 1Al 2 o 3 : 2HPO 4 2- : 1200H 2 O.

[0101]Under the condition of stirring, the reactant gel is aged at about 31-32° C. for about 3 hours to prepare the reactant gel precursor.

[0102] The reactant gel precursor was transferred to a 100m...

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Abstract

The invention provides a ZSM-35 molecular sieve and a preparation method thereof. The ZSM-35 molecular sieve is an aggregation-state ZSM-35 molecular sieve with a macroporous-mesoporous-microporous composite hierarchical pore structure. The raw materials of the preparation method do not contain organic template agents and seed crystals, the preparation method comprises the following steps: preparing a reactant gel, wherein the molar ratio of SiO2, Al2O3, Na2O, K2O, oxygen-containing acid group and H2O is (20-40):1.0:(1.5-2.0):(4.0-6.5):(1.0-4.0):(600-1200); performing aging treatment and crystallization treatment on the reactant gel in sequence, and washing and drying the obtained synthetic product. The ZSM-35 molecular sieve provided by the invention can be synthesized on the premise of not using the organic template agent and the seed crystal, in addition, due to the hierarchical pore structure, diffusion and mass transfer of materials are facilitated.

Description

technical field [0001] The present invention relates to the preparation technology of molecular sieve catalysts, in particular to a ZSM-35 molecular sieve and its preparation method, especially to an aggregated state ZSM-35 molecular sieve with macropore-mesopore-micropore composite multi-stage channel structure and its Green preparation process. Background technique [0002] Zeolite molecular sieves, especially silica-alumina zeolite molecular sieve materials, are widely used in petroleum refining and synthesis of fine chemicals due to their special pore structure. ZSM-35 molecular sieve is a mesoporous molecular sieve material with the characteristic topological structure of FER. The channels in the [001] direction are 10-membered rings with a size of 0.42×0.54nm; the channels in the [010] direction are 8-membered rings with a size of 0.35×0.48nm, a two-dimensional intersecting channel system with vertically divided six-membered rings, in which the FER cage is a 0.6-0.7nm...

Claims

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Application Information

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IPC IPC(8): C01B39/44
CPCC01B39/44C01P2002/72C01P2004/03C01P2004/61C01P2006/12C01P2006/14C01P2006/17B01J29/65B01J35/002B01J35/1019B01J35/1061B01J35/006B01J2229/16B01J2229/60
Inventor 刘海燕郑涛刘植昌孟祥海张睿徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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