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Process for preparing Na-RHO zeolite with silicon aluminium skeleton

A framework and zeolite technology, which is applied in the field of hydrothermal synthesis of Na-RHO zeolite of silica-alumina framework, can solve the problems of high price and limited application of RHO zeolite, and achieve the effect of reducing production cost.

Inactive Publication Date: 2008-03-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although RHO zeolite has high selective catalytic performance in the reaction of preparing dimethylamine from methanol and ammonia, the application of RHO zeolite in industrial production is greatly limited due to the need to use expensive cesium ions in the synthesis

Method used

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  • Process for preparing Na-RHO zeolite with silicon aluminium skeleton
  • Process for preparing Na-RHO zeolite with silicon aluminium skeleton
  • Process for preparing Na-RHO zeolite with silicon aluminium skeleton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Preparation of directing agent

[0022] Weigh 0.283g of sodium aluminate and 1.006g of sodium hydroxide, add 2.7mL of deionized water, heat to dissolve, slowly add to 4.3mL of water glass after cooling to obtain a clear solution, stir for 15 minutes, and place at room temperature for 24 hours to obtain Highly active structure-directing agent.

[0023] The molar ratio of each component of the directing agent is: 16Na 2 O: 1.0Al 2 o 3 : 15SiO 2 : 320H 2 O.

Embodiment 2

[0024] The preparation of the Na-RHO zeolite of embodiment 2 silica-alumina framework (1)

[0025] Use a pipette to measure 10.0mL of water glass, add it to 0.50g of polyquaternium-6, add 1.14mL of deionized water, stir evenly, add 1.38mL of the guide agent prepared according to Example 1, and stir evenly Add 2.94mL0.88molL -1 Al 2 (SO 4 ) 3 solution and 1.8mL NaAlO 2 Solution (2.18molL -1 Na 2 O, 1.02molL -1 al 2 o 3 ), so that the molar ratio of each component in the silica-alumina gel is 2.6Na 2 O: 1.0Al 2 o 3 : 10.0 SiO 2 : 200H 2 O, SiO in feed 2 The mass ratio m to polyquaternium-6 was 13.8. Stir the gel for more than 0.5 hours (can be within 3 hours), put it into the reaction kettle, crystallize at 110°C for 46 days, take out the reaction kettle, filter and wash with suction, dry the sample at room temperature, and calcinate at 500-600°C for 3-6 hours to remove Product 1 was obtained after organic template.

[0026] The XRD pattern of product 1 is shown...

Embodiment 3

[0027] The preparation (2) of the Na-RHO zeolite of embodiment 3 silica-alumina skeletons

[0028] Weigh 0.214g NaAlO 2 and 0.101 g of NaOH were dissolved in 6.6 mL of deionized water to obtain solution 1. Use a pipette to measure 7.4 mL of water glass, add it to 0.12 g of polyquaternium-6 and stir evenly, then add 0.3 mL of the directing agent prepared according to Example 1, and stir evenly to obtain solution 2. Slowly add solution 1 to solution 2 under stirring conditions, so that the molar ratio of each component in the silica-alumina gel is 12.0Na 2 O: 1.0Al 2 o 3 : 32.0 SiO 2 : 768H 2 O, SiO in feed 2 The mass ratio m to polyquaternium-6 is 40. Stir the gel for more than 0.5 hours (do not need to exceed 3 hours), put it into the reaction kettle, crystallize at 110°C for 14 days, take out the reaction kettle, filter and wash with suction, dry the sample at room temperature, and calcinate at 500-600°C for 3-6 hours to remove organic matter. The product 2 was obtain...

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Abstract

A process for preparing Na-RHO zeolite with Si-Al skeleton from water glass as Si source, aluminum sulfate and / or sodium aluminate as Al source and poly-quaternary ammonium salt-6 as template agent includes such steps as preparing pilot agent, preparing Si-Al gel, hydrothermal crystallizing at 95-125 deg.C for 8-60 days, and calcining.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry and catalytic chemistry, and in particular relates to a method for hydrothermally synthesizing Na-RHO zeolite with a silicon-aluminum framework by using polyquaternium-6 as a template in a sodium ion system. Background technique [0002] Zeolites are hydrated aluminosilicate crystals made of TO 4 (T atoms refer to Si, Al) tetrahedrons are three-dimensional four-connected frameworks formed by oxygen atoms sharing vertices. Due to the high hydrothermal stability, large specific surface area, pores and cages of different sizes, zeolites have a wide range of applications in the fields of ion exchange, diffusion and adsorption, shape selectivity and catalytic chemistry, and host-guest assembly chemistry. application. The framework structure of RHO zeolite is composed of truncated octahedrons (α-cages) connected by double eight-membered rings (D8R) in a body-centered cubic arrangement. Ze...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
CPCC01B39/48
Inventor 肖丰收刘淑真李连生
Owner JILIN UNIV