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Post-processing modification method of Ti-Si molecular sieve

A titanium-silicon molecular sieve, molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficulty in significantly improving the catalytic activity of TS-1, inability to modify, etc., and achieve simple and easy operation. It is easy to operate, the process is easy, and the catalytic oxidation activity is improved.

Inactive Publication Date: 2014-06-25
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the skeleton of TS-1 is electrically neutral, it cannot be modified by ion exchange.
[0006] In the existing literature, it is difficult to significantly improve the catalytic activity of TS-1 through simple post-treatment methods

Method used

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  • Post-processing modification method of Ti-Si molecular sieve
  • Post-processing modification method of Ti-Si molecular sieve
  • Post-processing modification method of Ti-Si molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Grind TS-1-20-CAL synthesized in Comparative Example 1 with sodium fluoride evenly, SiO 2 The molar ratio of / NaF was 50. The dry glue obtained is transferred to the lining of a small crystallization kettle.

[0035] (2) First add a certain amount of deionized water and small supports to the bottom of the inner substrate of the large crystallization kettle. The weight ratio of deionized water to dry glue is 1:1, and place the dry glue prepared in step (1) The small liner is placed on the support in the large crystallization tank so that the small liner where the dry glue is placed is not in direct contact with the water phase. Finally, the crystallization tank is closed and allowed to stand at 175°C for 3 days. The sample is routinely filtered, washed, and dried to obtain a modified titanium-silicon molecular sieve NaF-TS-1-20-a.

Embodiment 2

[0037] (1) Grind the TS-1-50-CAL synthesized in Comparative Example 1 with sodium fluoride evenly, SiO 2 The molar ratio of NaF / NaF was 50 and milled for 30 minutes. The prepared dry glue is evenly divided into three parts and transferred to three small crystallization kettle linings respectively.

[0038] (2) Except for the following differences, the operation steps are the same as step (2) of Example 1. The three dry glues were left standing at 175°C for 1, 3, and 7 days respectively. Modified titanium-silicon molecular sieves NaF-TS-1-50-a, NaF-TS-1-50-b, and NaF-TS-1-50-c were obtained respectively.

Embodiment 3

[0045] (1) Grind the TS-1-HMI-CAL synthesized in Comparative Example 3 with sodium fluoride evenly, SiO 2 The molar ratio of / NaF was 25. The dry glue produced is transferred to the lining of a small crystallization kettle.

[0046] (2) The operation steps are the same as step (2) of Example 1. A modified titanium-silicon molecular sieve NaF-TS-1-HMI was obtained.

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Abstract

The invention discloses a post-processing modification method of a Ti-Si molecular sieve, characterized by uniformly mixing a roasted Ti-Si molecular sieve TS-1 with inorganic salt to obtain a physical mixture, processing the physical mixture at a certain temperature by using dry gel conversion, wherein the modified molecular sieve can be directly used as a catalyst for catalytic reaction, or the modified molecular sieve can be obtained by washing, or conducting ion exchange and then recovering and drying. The Ti-Si molecular sieve processed by the invention has greatly improved catalytic oxidation activity.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical synthesis, and relates to a method for post-treatment modification of titanium-silicon molecular sieves, in particular to a preparation method for post-treatment modification of TS-1 molecular sieves. Background technique [0002] In 1983, Taramasso et al first introduced transition metal titanium atoms into the framework of pure silicon molecular sieve silicalite-1 with MFI topology (US Patent 4410501), and named this molecular sieve containing framework titanium atoms TS-1 (Titanium silicalite -1). The discovery of titanium silicate molecular sieve TS-1 is a milestone in the field of zeolite molecular sieve and heterogeneous catalysis research. Due to its good thermal stability and hydrophobicity, and exhibited excellent catalytic activity and selectivity, TS-1 is widely used in olefin epoxidation, partial oxidation of alkanes, alcohol oxidation, oximation of ketones, Catalytic oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89C07D303/04C07D301/12
Inventor 王一萌王博伦
Owner EAST CHINA NORMAL UNIV
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