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A kind of naβ type molecular sieve and preparation method thereof

A molecular sieve, relative crystallinity technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of poor thermal stability and hydrothermal stability, low crystallinity, etc., achieve good thermal stability and hydrothermal stability, high Crystallinity, the effect of reducing the amount of use

Active Publication Date: 2018-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method reduces the amount of template agent and increases the yield of β molecular sieve, it needs to add composite template agent and seed crystal, and when the silicon-aluminum ratio exceeds 30, the crystallinity is low, and the thermal stability and hydrothermal stability are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of amorphous silicon-aluminum precursor

[0039] The preparation concentration is 40gAl 2 o 3 / L sodium aluminate working solution, take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 100g SiO 2 / L sodium silicate working solution. Take 150mL of sodium aluminate working solution and place it in a gel-forming tank, then add 45mL of sodium silicate working solution, control the reaction temperature at 20°C, and feed CO with a concentration of 50v%. 2 gas, stop passing CO when the pH reaches 10.0 2 , and then add 95mL of sodium silicate working solution, and then ventilate and stabilize for 20 minutes to obtain an amorphous silicon-aluminum precursor. The amorphous silicon-alumina precursor is based on the total weight of silicon dioxide and aluminum oxide, and the content in terms of silicon dioxide is 70wt%.

[0040] (2) Preparation of gel

[0041] Press Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:60:1.3:200, TEAOH / SiO 2 = 0...

Embodiment 2

[0047] (1) Preparation of amorphous silicon-aluminum precursor

[0048] The preparation concentration is 40gAl 2 o 3 / L sodium aluminate working solution, take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 120g SiO 2 / L sodium silicate working solution. Take 200mL of sodium aluminate working solution and place it in a gel-forming tank, then add 50mL of sodium silicate working solution, control the reaction temperature at 18°C, and feed CO with a concentration of 50v%. 2 gas, stop passing CO when the pH reaches 10.2 2 , then add 50mL of sodium silicate working solution, and then ventilate and stabilize for 20 minutes to obtain an amorphous silicon-aluminum precursor. The amorphous silicon-alumina precursor is based on the total weight of silicon dioxide and aluminum oxide, and the content in terms of silicon dioxide is 60wt%.

[0049] (2) Preparation of gel

[0050] Press Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:80:1.5:240, TEAOH / SiO 2 =0.070 t...

Embodiment 3

[0056] (1) Preparation of amorphous silicon-aluminum precursor

[0057] The preparation concentration is 50gAl 2 o 3 / L sodium aluminate working solution, take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 100g SiO 2 / L sodium silicate working solution. Take 200mL of sodium aluminate working solution and place it in a gel-forming tank, then add 60mL of sodium silicate working solution, control the reaction temperature at 20°C, and feed CO with a concentration of 50v%. 2 gas, stop passing CO when the pH reaches 10.0 2 , then add 40mL of sodium silicate working solution, and ventilate and stabilize for 20 minutes to obtain an amorphous silicon-aluminum precursor. The amorphous silicon-alumina precursor is based on the total weight of silicon dioxide and aluminum oxide, and the content in terms of silicon dioxide is 50wt%.

[0058] (2) Preparation of gel

[0059] Press Al 2 o 3 : SiO 2 : Na 2 O: H 2 O=1:90:1.7:260, TEAOH / SiO 2 = 0.060 total...

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PUM

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Abstract

The invention discloses a Naβ molecular sieve and a preparation method thereof. The properties of the Naβ-type molecular sieve are as follows: the SiO2 / Al2O3 molar ratio is 40-100, the specific surface area is 500-800m2 / g, the pore volume is 0.35-0.60mL / g, and the relative crystallinity is 101%-150%. The relative crystallinity of the molecular sieve after air roasting is above 100%; the relative crystallinity of the Naβ molecular sieve after steam hydrothermal treatment is above 95%. The preparation method of the invention can not only reduce the usage amount of the organic template, but also can synthesize the Naβ molecular sieve with high crystallinity and high silicon-aluminum ratio, and has better thermal stability and hydrothermal stability.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve, in particular, provides a Naβ molecular sieve and a preparation method thereof. Background technique [0002] In 1967, Wadlinger of Mobile Company first synthesized β molecular sieve by mixing and crystallizing sodium aluminate, silica gel, tetraethylammonium hydroxide (TEAOH) and water. β molecular sieve has a 12-membered ring intersecting channel structure, the 12-membered ring of the one-dimensional channel parallel to the (001) crystal plane has a pore size of 0.57-0.75nm, and the other 12-membered ring of the two-dimensional channel parallel to the (100) crystal plane The pore size is 0.56 ~ 0.65nm. Because of its special structure, it has both acid catalytic properties and structural selectivity. The β molecular sieve modified by various methods can be used for hydrocracking, hydrofining, and conversion of light aliphatic hydrocarbons to Aromatics, benzene alkylation, cracking, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
Inventor 孙晓艳樊宏飞王继锋于政敏
Owner CHINA PETROLEUM & CHEM CORP
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