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Synthesis of aluminium riched AFI zeolite

A zeolite, sodium chabazite technology, applied in the direction of crystalline aluminosilicate zeolite, molecular sieves and alkali exchange compounds, other chemical processes, etc., can solve the problems of low silica, no teaching, no teaching high purity, etc.

Inactive Publication Date: 2002-08-14
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, the prior art does not teach how to prepare high purity low silica AFI type zeolites with potential use in adsorption and catalytic applications
Moreover, the prior art does not teach how to remove templates from high purity (dislocation-free, no intergrowth) low-silica gmelinite without altering its GME structure

Method used

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  • Synthesis of aluminium riched AFI zeolite
  • Synthesis of aluminium riched AFI zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 synthesizes high-quality Na-type gmelinite

[0051] 5.42 Dab-4Br: 1 Al 2 o 3 : 16.7 Na 2 O: 30 SiO 2 : 570H 2 The gel composition of O was prepared as follows: First, by dissolving aluminum hydroxide hydrate (54% Al 2 o 3 , Aldrich), to prepare sodium aluminate solution (0.4mol / kg Al 2 o 3 and 4mol / kg of NaOH), then 25.0g of sodium aluminate solution was mixed with 54.2g of template Dab-4Br solution (16.4% by weight), and then 66.6g of sodium silicate solution (27% SiO 2 , 14% NaOH, Aldrich). The reaction mixture was stirred for 5 minutes at room temperature, the mixture was transferred to a Teflon bottle and heated in a convection oven at 80°C for 12 days. The product was filtered, washed with water, and then dried in an oven at 100°C. XRD analysis showed high quality Na-type gmelinite ( figure 1 A). Elemental analysis showed that SiO 2 / AlO 3 The ratio of = 4.6. The final product also contains organic species derived from organic templates....

Embodiment 2

[0052] Embodiment 2 prepares Li-GME

[0053] The Na-type gmelinite sample prepared as in Example 1 was contacted with an aqueous solution containing 2 mol / kg KOH and 1 mol / kg KCl at 90° C. for 1 day. It is expected that the molar concentration of the mixture of inorganic cations to be exchanged must be at least 10%. In this particular case, the molar concentration of potassium ions must be at least 10%. Repeat this ion exchange process 3 times in succession. The use of KOH is optional but desirable because KOH dissolves amorphous and other impurities. The product was filtered, washed with water, and then dried in an oven at 100°C. Based on K ion-exchanged gmelinite characteristic peaks, no impurity peaks, and low baseline, XRD analysis shows high-quality K ion-exchanged gmelinite (refer to figure 1 B).

[0054] The K ion-exchanged gmelinite was calcined at 500° C. in air for 5 hours to remove the organic template. XRD analysis confirms that product is gmelinite (with ref...

Embodiment 3

[0056] Embodiment 3 synthetic AFI

[0057] A sample of gmelinite prepared as described in Example 1 was calcined at 500°C in air for 5 hours. XRD analysis shows that product has AFI structure ( figure 1 E). The rate of heating had no significant effect.

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PUM

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Abstract

A low silica and a high purity gmelinite zeolite that have a SiO2 / Al2O3 ratio of about 10 or less are provided.

Description

field of invention [0001] This invention relates to aluminosilicate type zeolites, and more particularly to the synthesis and use of aluminum-rich (low silica) AFI and GME type zeolites. Background of the invention [0002] Zeolites are a class of molecular sieves with a silicate lattice. In general, they are microporous crystalline materials of variable composition and are characterized by a three-dimensional structure with many channels and / or cages. Silicon-oxygen tetrahedron (SiO 4 ) or aluminum oxide tetrahedron (AlO 4 ) constitute the framework of the zeolite. [0003] Zeolites differ from each other in their composition and structure, which determine their physical and chemical properties, as well as their useful applications. Most zeolites are assigned three-letter structural codes. For example, FAU is the structure code for X-type zeolite, GME is the structure code for gmelinite, and AFI is AlPO 4 -Structure code of type 5 molecular sieve. [0004] Many zeoli...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01D15/00B01D53/02B01J20/18C01B39/02C01B39/48C01B39/54
CPCB01D53/02B01J20/186C01B39/48C01B39/02B01D15/00B01D2253/108B01J20/18
Inventor Q·霍
Owner PRAXAIR TECH INC
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