Method for preparing hierarchical porous titanium silicalite TS-1

A technology of titanium silicalite, TS-1, applied in the field of preparation of multi-level porous titanium silicalite TS-1, to achieve the effect of reducing synthesis cost, simplifying the preparation process, and eliminating cumbersome processes

Inactive Publication Date: 2011-02-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method omits the preparation of carbon templates, i

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  • Method for preparing hierarchical porous titanium silicalite TS-1
  • Method for preparing hierarchical porous titanium silicalite TS-1

Examples

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Example Embodiment

[0023] Example 1

[0024] Take 1.5g of tetrapropylammonium bromide, 8ml of deionized water and 3.9ml (weight 30%) of silica sol and add 8.4g (weight 50%) of caramel solution in turn; take 0.16ml of tetrabutyl titanate to dissolve In 1.6ml isopropanol (volume ratio 1:10), mix well and slowly drop into the above solution. The molar ratio of tetrapropylammonium bromide, deionized water, silica sol and tetrabutyl titanate is composed Is 0.24:36.5:1:0.02, caramel and silica sol (with SiO 2 The resulting mixture is heated to 80°C and stirred for 2h; then the mixture is placed at 170°C for 28h to obtain a black solid dry gum. Grind the dry glue into a powder and place it in a container in the middle of the crystallization kettle, add 9ml of ethylenediamine and 12ml of water at the bottom; place the crystallization kettle at 170°C for 7d. After washing, filtering, and drying the obtained solid, it is calcined at 650° C. for 10 hours to obtain multi-stage TS-1. In the XRD pattern of the...

Example Embodiment

[0025] Example 2

[0026] Take 1.5g of tetrapropylammonium bromide, 8ml of deionized water and 3.9ml (weight 30%) of silica sol and add 2.8g (weight 50%) of caramel solution in turn; take 0.16ml of tetrabutyl titanate to dissolve In 1.6ml isopropanol (volume ratio 1:10), mix well and slowly drop into the above solution. The molar ratio of tetrapropylammonium bromide, deionized water, silica sol and tetrabutyl titanate is composed 0.24:30:1:0.02, caramel and silica sol (with SiO 2 The mass ratio is 1:1; the resulting mixture is heated to 80°C and stirred for 2h; then the mixture is placed at 170°C for 24h to obtain a black solid dry gum. Grind the dry glue into a powder and place it in a container in the middle of the crystallization kettle, add 9ml of ethylenediamine and 12ml of water at the bottom; place the crystallization kettle at 170°C for 7d. After washing, filtering, and drying the obtained solid, it is calcined at 650° C. for 10 hours to obtain multi-stage TS-1.

Example Embodiment

[0027] Example 3

[0028] Take 1.5g of tetrapropylammonium bromide, 8ml of deionized water and 3.9ml (weight 30%) of silica sol and add 5.6g (weight 50%) of caramel solution in turn; take 0.16ml of tetrabutyl titanate to dissolve In 1.6ml isopropanol (volume ratio 1:10), mix well and slowly drop into the above solution. The molar ratio of tetrapropylammonium bromide, deionized water, silica sol and tetrabutyl titanate is composed Is 0.24:33.3:1:0.02, caramel and silica sol (with SiO 2 The resulting mixture is heated to 80°C and stirred for 2h; then the mixture is placed at 170°C for 36h to obtain a black solid dry gum. Grind the dry glue into a powder and place it in a container in the middle of the crystallization kettle, add 9ml of ethylenediamine and 12ml of water at the bottom; place the crystallization kettle at 170°C for 7d. After washing, filtering, and drying the obtained solid, it is calcined at 650° C. for 10 hours to obtain multi-stage TS-1.

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Abstract

The invention discloses a method for preparing hierarchical porous titanium silicalite TS-1, which is characterized in that: carbon black is replaced by cheap sugar, and materials such as carbon nanotubes and the like are used as a mesoporous/macroporous template, so the synthesis cost of a molecular sieve is greatly reduced. In the process of preparing dry glue by performing heat treatment on sugar-containing TS-1 molecular sieve synthetic sol, the sugar is heated and part of sugar is carbonized and dehydrated to directly form a hard template, so that high-temperature carbonization under the protection of inert gas is avoided, the complicated process of separately preparing a carbon template and a carbon-silicon complex is saved, and the preparation process of a hierarchical porous zeolite molecular sieve is greatly simplified. The product prepared by the method has the advantages of regular shape and microporous channel of the conventional TS-1, mesopores of 4 to 50nm and macropores of more than 50nm which pass through zeolite, and mutually communicated hierarchical porous channels to overcome the limitation of inherent micropores of the zeolite on catalytic reaction, and can be used for olefin epoxidation, aromatic hydrocarbon hydroxylation, cyclohexanone ammoxidation, oxidation removal of different sizes of sulfides in liquid fuel, and the like.

Description

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Claims

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Application Information

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Owner DALIAN UNIV OF TECH
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