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Synthesis of ZSM-3 zeolite

A ZSM-3 and zeolite technology, applied in the field of synthesizing ZSM-3 zeolite, can solve problems such as easy occurrence of miscellaneous crystals, achieve the effects of improving crystallinity, simplifying reaction conditions and steps, and improving reaction speed

Inactive Publication Date: 2002-12-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

M.A.Shubaeva et al. (Kinet.Catal., 1992, 191) mixed various ingredients pre-cooled to 5-10°C and directly crystallized at 65-100°C to obtain ZSM-3 zeolite, but it is more prone to miscellaneous crystals

Method used

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  • Synthesis of ZSM-3 zeolite
  • Synthesis of ZSM-3 zeolite

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Firstly, 1.30 g of sodium aluminate and 0.34 g of sodium hydroxide were dissolved in 30 g of water to obtain solution 1, then 1.59 g of lithium hydroxide was dissolved in 12 g of water to obtain solution 2, and then mixed evenly. In 4.78 grams of water glass, add 10 grams of water and dilute to obtain solution 3, and add the mixed solution in front, stir at room temperature, then add 0.12 grams (4%) X zeolite (SiO 2 / Al 2 o 3 =2.70), sealed in the reactor and crystallized at 70°C for 23 hours, washed and filtered the precipitate, and dried at 100°C to obtain ZSM-3 zeolite.

[0019] The molar ratio of raw materials in the reaction system (calculated as oxides) is: SiO 2 / Al 2 o 3 = 4, (Na 2 O+Li 2 O) / SiO 2 =1.75, Li 2 O / (Na 2 O+Li 2 O) = 0.5, H 2 O / (Na 2 O+Li 2 (0)=86.

Embodiment 2

[0021] Dissolve 3.12 grams of sodium aluminate and 0.36 grams of sodium hydroxide in 120 grams of water to obtain solution 1, dissolve 6.72 grams of lithium hydroxide in 41.28 grams of water to obtain solution 2, add 40 grams of water to dilute to obtain solution 3 in 28.56 grams of water glass . After mixing solutions 1 and 2 uniformly, add solution 3, stir evenly at room temperature, then add 0.05 g (0.5%) Y zeolite (SiO 2 / Al 2 o 3 =3.32), sealed in the reactor and crystallized at 50°C for 38 hours, washed and filtered the precipitate and dried at 100°C to obtain ZSM-3 zeolite.

[0022] The molar ratio of raw materials in the reaction system (calculated as oxides) is: SiO 2 / Al 2 o 3 =10, (Na 2 O+Li 2 O) / SiO 2 =1.09, Li 2 O / (Na 2 O+Li 2 O) = 0.57, H 2 O / (Na 2 O+Li 2 (0)=92.

Embodiment 3

[0024] First dissolve 2.62 grams of sodium aluminate in 60 grams of water, then dissolve 4.46 grams of lithium hydroxide in 25.08 grams of water, and then mix the two solutions evenly. After adding 20 grams of water to 9.86 grams of silica sol for dilution, add the previous mixed solution, stir evenly at room temperature, then add 0.25 grams (5%) X zeolite (SiO 2 / Al 2 o 3 =2.45), sealed in the reactor and crystallized at 90°C for 35 hours, filtered and washed the precipitate, and dried at 100°C to obtain ZSM-3 zeolite.

[0025] The molar ratio of raw materials in the reaction system (calculated as oxides) is: SiO 2 / Al 2 o 3 = 4, (Na 2 O+Li 2 O) / SiO 2 =1.75, Li 2 O / (Na2 O+Li 2 O) = 0.7, H 2 O / (Na 2 O+Li 2 (0)=86.

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Abstract

The present invention relates to a process of synthesizing ZSM-3 zeolite of chemical formula (0.1-0.9) Li2O (0.9-0.1)Na2O.Al2O3(2-6)SiO2.xH2O. Into conventional synthesis system, certain amount of faujasite as crystal seed is added so that ZSM-3 zeolite is synthesized in a one-step process. The said process has the features of less operation steps and short crystallizing period.

Description

Technical field: [0001] The invention relates to a new method for synthesizing ZSM-3 zeolite by adding faujasite (X or Y zeolite) as crystal seed. Background technique: [0002] Faujasite usually refers to FAU zeolite (including X-type and Y-type and natural faujasite). In addition, there is a zeolite called EMT, which is the same as FAU zeolite. It is also a sodalite cage (β cage) connected by double six-membered rings in a certain order. But a new structure is formed due to the different connection order. FAU zeolite belongs to the cubic crystal system and contains only one hypercage commonly called faujasite cage (1.3×1.3×1.4nm), while EMT belongs to the hexagonal crystal system and contains two hypercages called Hypercage (1.3×1.3×1.4nm). 1.4nm) and Hypocage (0.69×1.3×1.3nm) supercages, and has a two-dimensional intersecting 12-member ring straight channel system, and the structure is more smooth. [0003] ZSM-3 zeolite has very similar physical and chemical propertie...

Claims

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Application Information

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IPC IPC(8): C01B39/46
Inventor 易洪江孙尧俊吴泰琉王力平
Owner FUDAN UNIV
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