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Mesopore USSTI zeolite with high silicon content and high hydrothermal stability and preparation method thereof

A technology of hydrothermal stability and thermal stability, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high price of ammonium fluorosilicate solution, environmental pollution of fluoride ions, poor hydrothermal stability, etc., and achieve wide market application Prospects, low cost of industrialization, and the effect of simple preparation methods

Inactive Publication Date: 2012-11-14
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies have used hydrochloric acid dealumination and ammonium fluorosilicate dealumination to supplement silicon to obtain high-silicon STI zeolite [Cheng Xiaowei et al., Acta Chem. Sinica, 2006, 64, 1], but ammonium fluorosilicate solution is expensive and fluoride ion Causes environmental pollution and is not conducive to use in mass production
Although the sample obtained by hydrochloric acid dealumination has high thermal stability, its hydrothermal stability is relatively poor due to many skeleton defects.

Method used

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  • Mesopore USSTI zeolite with high silicon content and high hydrothermal stability and preparation method thereof
  • Mesopore USSTI zeolite with high silicon content and high hydrothermal stability and preparation method thereof
  • Mesopore USSTI zeolite with high silicon content and high hydrothermal stability and preparation method thereof

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Experimental program
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Effect test

Embodiment 1-12

[0034] The original Ca-STI zeolite is prepared according to the method described in the present invention, and the ammonium solution is heat-exchanged according to the different ammonium exchange conditions described in Table 1. After washing and drying, it is compressed into tablets and broken into particles with a particle size of 30-50 meshes. In the tube furnace, 110°C saturated water vapor (according to the different steam treatment conditions described in Table 1) was treated for a certain period of time at a certain flow rate and a certain temperature to obtain high-silicon high-hydrothermal stability with the physical and chemical properties described in Table 1. Mesoporous USSTI zeolite.

[0035] Table 1 shows the different ammonium exchange conditions used in Examples 1-12, different steam treatment conditions and the physicochemical properties of the prepared high-silicon and high-hydrothermal-stability mesoporous USSTI zeolite.

[0036]

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Abstract

The invention belongs to the technical field of natural zeolite material modification, in particular to mesopore USSTI zeolite with high silicon content and high hydrothermal stability and a preparation method thereof. The method comprises the following steps: using the natural STI zeolite as raw materials to obtain NH4-STI zeolite through heat exchange via an ammonium solution; and then, obtaining the USSTI zeolite with high silicon content and high hydrothermal stability through the treatment by saturated water vapor with different temperatures and different flow rates. The natural mineral resources used by the invention have high grade, rich storage amount and low exploitation cost, at the same time, the method for preparing the USSTI zeolite with high silicon content and high hydrothermal stability is simple and convenient and has lower cost, and the USSTI zeolite has very wide application prospects when being used as catalysts, sorbents and functional materials.

Description

technical field [0001] The invention belongs to the technical field of modification of natural zeolite materials, and relates to a mesoporous USSTI zeolite with high silicon and high hydrothermal stability and a preparation method thereof. It specifically relates to a method for treating natural STI zeolite with steam and the prepared USSTI zeolite with high silicon and high hydrothermal stability. Background technique [0002] According to reports, the natural stilbite produced in the Beijing area of ​​my country has high grade, abundant reserves and low mining cost. It is a new natural mineral resource with wide application prospects. The topological structure of the natural stilbite framework is STI (stilbite) type, and the chemical composition of the unit cell is Na 0.2 Mg 0.1 Ca 8.4 [Al 17.2 Si 54.8 o 144 ]·65H 2 O, belongs to Ca type, and the atomic ratio of silicon to aluminum in the skeleton is about 3.2. STI zeolites have elliptical mesoporous ten-membered r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 程晓维何秋平鄢浩龙英才
Owner FUDAN UNIV
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