Method for synthetizing ZSM-35 molecular sieve by seed crystal process

A technology of ZSM-35 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite and iron conglomerate crystalline aluminosilicate zeolite, etc., can solve the problems of increased synthesis cost, high reaction temperature, and long time, so as to reduce loss, The effect of large specific surface area and low price

Inactive Publication Date: 2011-02-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the reaction temperature is high, the time is long,

Method used

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  • Method for synthetizing ZSM-35 molecular sieve by seed crystal process
  • Method for synthetizing ZSM-35 molecular sieve by seed crystal process
  • Method for synthetizing ZSM-35 molecular sieve by seed crystal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Synthesis of ZSM-35 molecular sieve with RUB-37 as induced seed crystal

[0016] First, dissolve 0.078g of sodium aluminate in water, then add 0.182g of NaOH to it, after obtaining a clear solution, add 0.72g of white carbon black, continue stirring at room temperature until a uniform silica-alumina gel is formed, and finally add 0.036g of RUB- 37 Stir evenly, transfer the reaction raw materials to a polytetrafluoroethylene stainless steel reactor, and crystallize at 150°C for 3 days. The ratio of the reaction raw materials is as follows; SiO 2 : 0.08NaAlO 2 :0.38NaOH:35H 2 O: 5% RUB-37, the product was suction filtered and dried to obtain ZSM-35 molecular sieve.

[0017] attached figure 1 It is the structural relationship between RUB-37 and ZSM-35. It can be seen from the figure that the two have the same structural unit, but the connection method is different.

[0018] attached figure 2 It is the XRD pattern of the sample. It can be seen from the figu...

Embodiment 2

[0021] Example 2: Synthesis of ZSM-35 molecular sieve at 120°C with RUB-37 as the induced seed crystal

[0022] First, dissolve 0.088g of sodium aluminate in water, then add 0.192g of NaOH to it, after obtaining a clear solution, add 0.72g of white carbon black, continue stirring at room temperature until a uniform silica-alumina gel is formed, and finally add 0.036g of RUB- 37 Stir evenly, transfer the reaction raw materials to a polytetrafluoroethylene stainless steel reactor, and crystallize at 120°C for 10 days. The ratio of the reaction raw materials is as follows; SiO 2 : 0.09NaAlO 2 :0.4NaOH:35H 2 O: 5% RUB-37, the product was suction filtered and dried to obtain ZSM-35 molecular sieve.

Embodiment 3

[0023] Example 3: Synthesis of ZSM-35 molecular sieve with 3% RUB-37 as induced seed crystal

[0024] First, dissolve 0.088g of sodium aluminate in water, then add 0.172g of NaOH to it, add 0.72g of white carbon black after obtaining a clear solution, continue stirring at room temperature until a uniform silica-alumina gel is formed, and finally add 0.022g of RUB- 37 Stir evenly, transfer the reaction raw materials to a polytetrafluoroethylene stainless steel reactor, and crystallize at 150°C for 3 days. The ratio of the reaction raw materials is as follows; SiO 2 : 0.09NaAlO 2 :0.36NaOH:35H 2 O: 3% RUB-37, the product was suction filtered and dried to obtain ZSM-35 molecular sieve.

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Abstract

The invention relates to a molecular sieve preparation method, aiming to provide a method for synthetizing a ZSM-35 molecular sieve by a seed crystal process. After sodium aluminate is dissolved in water, adding NaOH and stirring; after a settled solution is obtained, adding white carbon black, and stirring the mixture at room temperature until forming even sialsphere gel; then adding zeolite seed crystal RUB-37 or ZSM-35 and evenly stirring; transferring the mixture to an agitated reactor and crystallizing at the temperature of 120-150 DEG C for 3-10 days; and filtering and drying to obtain the ZSM-35 molecular sieve. The product of the invention keeps good degree of crystallization and purity and has good catalytic reaction activity. The whole production process does not use organic template agent or potassium ion and can greatly shorten crystallization time by the seed crystal process, thus reducing unnecessary loss in the production process; and meanwhile, the product has larger specific surface area. The adopted inorganic raw materials for production protect environment and have low price.

Description

technical field [0001] The invention belongs to a molecular sieve preparation method, in particular to a method for synthesizing a ZSM-35 molecular sieve by a seed crystal method. Background technique [0002] Microporous molecular sieves are widely used in adsorption, separation, ion exchange, catalysis and other fields due to their regular pore structure and uniform pore size distribution. ZSM-35 molecular sieve is a zeolite with a medium pore size and a FER-type framework structure. It has a vertically intersecting two-dimensional pore system, and the size of the ten-membered ring channel parallel to the [001] plane is 4.2×5.4 ; The size of the eight-membered ring channel parallel to the [010] plane is 3.5×4.8 . ZSM-35 molecular sieve can be widely used in the conversion process of hydrocarbons, such as isomerization, polymerization, aromatization and cracking of linear olefins, etc., and has a good application prospect in industry. Barrer and Marshall first synthesi...

Claims

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Application Information

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IPC IPC(8): C01B39/44
Inventor 肖丰收张海燕谢彬孟祥举
Owner ZHEJIANG UNIV
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