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High metal content molecular sieves and their manufacture

A molecular sieve and metal technology, applied in the field of high metal content molecular sieves

Inactive Publication Date: 2011-01-19
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve a low SiO of 20 or less 2 / Al 2 o 3 ratio, that is, aluminosilicates with higher levels of aluminum

Method used

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  • High metal content molecular sieves and their manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1 uses n-propylamine and seed synthesis ZSM-5

[0070] Prepared by 250g deionized water, 10g 50% NaOH aqueous solution, 16g sodium aluminate (25.5% alumina and 19.5% Na 2 O), 8g n-propylamine, 3g ZSM-5 seeds and 75g Reaction (synthesis) mixture of 90 amorphous silica-alumina (15:1 molar silica / alumina) (supplied by Sasol / Condea). H of the reaction mixture 2 The O / NaOH molar ratio was 125.6. The reaction mixture was injected into a Parr autoclave and crystallized at 155°C (310°F) and a stirring rate of 200 RPM for 27 hours.

[0071] The solid product was isolated from the resulting product mixture by filtration, washed with deionized water and dried at 110°C. The product mixture contained 78.7% solids. The solid product was analyzed by X-ray diffraction and scanning electron microscopy (SEM), and it was found to be highly crystalline small crystal ZSM-5 (MFI structure type at this time), whose SiO 2 / Al 2 o 3 The molar ratio is 9:1.

[0072]The ZSM-5...

Embodiment 2

[0073] Embodiment 2 uses n-propylamine and seed synthesis ZSM-5

[0074] Prepared by 250g deionized water, 14.5g 50% NaOH aqueous solution, 6g sodium aluminate (25.5% alumina and 19.5% Na 2 O), 8g n-propylamine, 3g ZSM-5 seeds and 75g Reaction (synthesis) mixture of 90 amorphous silica-alumina (15:1 molar silica / alumina) (supplied by Sasol / Condea). H of the reaction mixture 2 The O / NaOH molar ratio was 91.5. The reaction mixture was injected into a Parr autoclave and crystallized at 155°C (310°F) and a stirring rate of 200 RPM for 24 hours.

[0075] The solid product was isolated from the resulting product mixture by filtration, washed with deionized water and dried at 110°C. The product mixture contained 86.9% solids. The solid product was analyzed by X-ray diffraction and scanning electron microscopy (SEM), and it was found to be highly crystalline small crystal ZSM-5 (MFI structure type at this time), whose SiO 2 / Al 2 o 3 The molar ratio is 11:1.

[0076] The ZSM...

Embodiment 3

[0077] Example 3 Synthesis of ZSM-5 using n-Propylamine and Seeds

[0078] Prepared by 125g deionized water, 10g 50% NaOH aqueous solution, 3g sodium aluminate (25.5% alumina and 19.5% Na 2 (0), 8g n-propylamine, 2g ZSM-5 seeds and 37.5g Reaction (synthesis) mixture of 90 amorphous silica-alumina (15:1 molar silica / alumina) (supplied by Sasol / Condea). H of the reaction mixture 2 The O / NaOH molar ratio was 71.0. The reaction mixture was injected into a Parr autoclave and crystallized at 155°C (310°F) and a stirring rate of 200 RPM for 22 hours.

[0079] The solid product was isolated from the resulting product mixture by filtration, washed with deionized water and dried at 110°C. The solid product was analyzed by X-ray diffraction and scanning electron microscopy (SEM), and it was found to be highly crystalline small crystal ZSM-5 (MFI structure type at this time), whose SiO 2 / Al 2 o 3 The molar ratio is 12:1.

[0080] The ZSM-5 material was converted to its acid form...

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Abstract

A process for manufacturing a synthetic porous crystalline molecular sieve requires an aqueous reaction mixture comprising a source of X2O3 (X is a trivalent element), a source of YO2 (Y is a tetravalent element) and a source of MOH (M is an alkali metal). The H2O / MOH molar ratio is within the range of 70 to 126 and the source Of X2O3 and YO2 is an amorphous material containing both X2O3 and YO2 and having YO2 / X2O3 molar ratio of 15 or less. The molecular sieve products are useful as catalysts and / or absorbents. Such molecular sieves having MFI structure type, TON structure type or the structure type of zeolite beta and a composition involving the molar relationship (n) YO2:X2O3 wherein n is from 2 to less than 15 are novel compositions of matter.

Description

[0001] Invention introduction [0002] This invention relates to the preparation of high metal content molecular sieves, especially but not exclusively high aluminum content molecular sieves such as aluminosilicates and the like, to certain new high metal content molecular sieves themselves, and to the use of these new materials and Methods of Preparation Processes in which materials are prepared as catalysts and / or absorbers. Background of the invention [0003] Aluminosilicates are a well known class of molecular sieve materials that have been used extensively as catalysts and absorbents. The basic structure of these crystalline materials includes SiO 4 Tetrahedron (which has four oxygen atoms at the vertices with a silicon atom at the center) and AlO 4 A tetrahedron (which has four oxygen atoms at the vertices with an aluminum atom at the center). These tetrahedra are connected to each other regularly and three-dimensionally throughout the structure through the sharing o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40C01B39/38C01B39/46C01B39/48B01J29/06C07C6/08
CPCC01B39/46C01B39/48C01B39/40B01J29/40C01B39/38B01J29/06
Inventor W·J·鲁斯M·K·鲁宾
Owner EXXONMOBIL CHEM PAT INC
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