SSZ-13 molecular sieve catalyst as well as preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of zeolite molecular sieve synthesis, can solve the problems of reducing the use efficiency of nano-zeolite, easy agglomeration, etc., and achieve the effects of inhibiting hydrogen transfer, low aluminum content, and less surface acid sites

Active Publication Date: 2017-10-24
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, small crystal or nano zeolites still face many problems in the process of synthesis and use, for example, they are easy to agglomerate during synthesis, and the composition and reaction conditions of th

Method used

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  • SSZ-13 molecular sieve catalyst as well as preparation method and application thereof
  • SSZ-13 molecular sieve catalyst as well as preparation method and application thereof
  • SSZ-13 molecular sieve catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of SSZ-molecular sieve catalyst is prepared by following method:

[0028] (1) Preparation of molecular sieve powder:

[0029]Dissolve 72.44g NaOH in 600g deionized water at room temperature, then add 1048.30g of N,N,N-trimethyladamantane ammonium aqueous solution (TMADa+, concentration 25wt%), stir well to form solution A, 3.94g NaAlO 2 Dissolve in 125.78g deionized water to form solution B, slowly add solution B to solution A and stir evenly to form solution C, then add 79.94g boric acid to the above solution, and stir until completely dissolved and continue to stir for half an hour, then in Add 122.62g of white carbon black within 1 hour, and keep stirring vigorously. After adding, continue stirring vigorously for 2 hours to obtain a mixed gel. The molar ratio of raw materials is:

[0030] Na 2 O: SiO 2 :Al 2 o 3 :B 2 o 3 :T:H 2 O=0.46:1:0.0118:0.32:0.62:42.0;

[0031] Then transfer the obtained mixed gel to a stainless steel synthesis kettle for cryst...

Embodiment 2

[0037] A kind of SSZ-molecular sieve catalyst is prepared by following method:

[0038] (1) Preparation of molecular sieve powder:

[0039] Dissolve 103.43g NaOH in 400g deionized water at room temperature, then add 3111.07g of N,N,N-trimethyladamantane ammonium aqueous solution (TMADa+, concentration 25wt%), stir to form solution A, and 2.18g quasi Boehmite was dissolved in 110.70g deionized water to form solution B, solution B was slowly added to solution A and stirred evenly to form solution C, then 61.46g H was added to the above solution 3 BO 3 , and stir until completely dissolved and continue to stir for half an hour, then add 122.62g column chromatography silica gel within 1 hour, and keep stirring vigorously, and continue stirring vigorously for 2 hours after adding to obtain a mixed gel, the molar ratio of raw materials is :

[0040] Na 2 O: SiO 2 :Al 2 o 3 :B 2 o 3 :T:H 2 O=0.64:1:0.008:0.246:1.84:79;

[0041] Then transfer the obtained mixed gel to a sta...

Embodiment 3

[0047] A kind of SSZ-molecular sieve catalyst is prepared by following method:

[0048] (1) Preparation of molecular sieve powder:

[0049] Dissolve 67.99g NaOH in 1000g deionized water at room temperature, then add 422.70g of N,N,N-trimethyladamantane ammonium aqueous solution (TMADa+, concentration 25wt%), stir to form solution A, and dissolve 606.62g of water Glass (SiO2, 27.1wt%) was dissolved in 452.35g deionized water to form solution B, solution B was slowly added to solution A and stirred evenly to form solution C, then 54.46g H3BO3 was added to the above solution, and stirred until completely dissolved and Continue to stir for half an hour, then add 1.77g of SB powder within 1 hour, and keep stirring vigorously. After adding, continue stirring vigorously for 2 hours to obtain a mixed gel. The molar ratio of raw materials is:

[0050] Na 2 O: SiO 2 :Al 2 o 3 :B 2 o 3 :T:H 2 O=0.57:1:0.0061:0.218:0.25:66;

[0051] Then transfer the obtained mixed gel to a stain...

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Abstract

The invention provides an SSZ-13 molecular sieve catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a sodium source, a silicon source, an aluminum source, a boron source, a template agent and deionized water into a synthesis kettle according to a ratio, then dynamically or statically crystallizing in temperature stages, filtering, washing and drying the product to obtain molecular sieve raw powder; roasting the molecular sieve raw powder at high temperature in the air atmosphere for removing the template agent, exchanging the molecular sieve raw powder with ammonium ions, then roasting the molecular sieve raw powder at the high temperature to obtain a hydrogen type SSZ-13 molecular sieve with a high silicon-aluminum ratio (the ratio of nSiO2 to nAl2O3 is greater than 80), wherein the hydrogen type SSZ-13 molecular sieve has appropriate acidic sites, thermal stability and aperture size. According to the SSZ-13 molecular sieve with controllable and high silicon-aluminum ratio, high crystallinity, small crystal grains, the range of the silicon-aluminum ratio of SSZ-13 prepared by the conventional method is broken through; the problem that the crystallinity of the molecular sieve catalyst during regeneration is reduced can be solved; when the SSZ-13 molecular sieve is used as a catalyst and is applied to MTO reaction, the SSZ-13 molecular sieve has extremely high reaction activity and selectivity.

Description

technical field [0001] The invention relates to the synthesis of zeolite molecular sieves, in particular to a method for synthesizing SSZ-13 molecular sieve catalysts with small crystal grains and high silicon-aluminum ratio. Specifically, it is a method for synthesizing the SSZ-13 molecular sieve catalyst with small grain size and high silicon-aluminum ratio without using organic ammonium salt as a structure-directing agent. Background technique [0002] The American chemist Zones synthesized a new molecular sieve SSZ-13 molecular sieve by the hydrothermal method in the 1980s, which is classified according to the size of the zeolite channel and belongs to the small-pore zeolite in the micropore. The structure of molecular sieve SSZ-13 is composed of AlO4 and SiO4 tetrahedrons connected end to end through oxygen atoms, orderly arranged into a crystal structure with an eight-membered ring shape, the pore size is 0.38nm, and the pore area is 0.113nm 2 . This structural featu...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C1/20C07C11/04C07C11/06
CPCB01J29/7038B01J2229/16B01J2229/37C07C1/20C07C2529/70C07C11/04C07C11/06Y02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 李进王志光李永宾
Owner CHINA CATALYST HLDG CO LTD
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