Post-treatment method of titanium-silicon molecular sieve material

A titanium-silicon molecular sieve and said technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low catalyst activity, poor catalyst stability, etc., achieve good dispersibility, increase the amount of framework titanium, The effect of reducing the amount of extra-framework titanium

Active Publication Date: 2010-02-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Appl.Catal.A: Gen., 2001, 213: 163-171 reported the research of epoxidized propylene to generate propylene oxide (PO), H 2 and O 2 React in situ to generate H on the active sites of noble metals such as Pd 2 o 2 intermediate, then generated H 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] Add 20 grams of titanium silicon molecular sieve TS-1 to the aqueous solution of tetrapropyl ammonium hydroxide containing ammonium nitrate palladium complex, hydrazine hydrate and cetyltrimethylammonium bromide, stir and mix evenly. The titanium silicon molecular sieve ( Gram): Cetyltrimethylammonium bromide (mole): Tetrapropylammonium hydroxide (mole): Hydrazine hydrate (mole): Ammonium nitrate palladium complex (g, calculated as palladium): Water (mole) )=100:0.005:0.5:3.0:0.5:1000. Then it was put into a stainless steel sealed reactor and hydrothermally treated at a temperature of 150°C and autogenous pressure for 48 hours. The resultant was filtered, washed with water, dried naturally, and dried at 180°C for 3 hours. The sample number obtained was A.

Example Embodiment

[0031] Example 2

[0032] Add 20 grams of titanium silicon molecular sieve TS-1 and hydrazine hydrochloride to the sodium hydroxide aqueous solution containing palladium carbonate and polypropylene and stir and mix uniformly, wherein titanium silicon molecular sieve (g): polypropylene (mole): sodium hydroxide (mole) : Hydrazine hydrochloride (mole): Palladium carbonate (g, in terms of palladium): Water (mole)=100:0.01:1.2:0.05:1.0:3500. Then it was put into a stainless steel sealed reactor and hydrothermally treated at a temperature of 180°C and autogenous pressure for 12 hours. The resultant was filtered, washed with water, dried naturally, and dried at 110°C for 3 hours. The sample number obtained was B.

Example Embodiment

[0033] Example 3

[0034] Add 20 grams of titanium silicon molecular sieve TS-1 to the aqueous solution of tetrapropyl ammonium hydroxide containing ammonium chloride palladium complex, hydrazine hydrate and tetradecyl trimethyl ammonium bromide, stir and mix evenly, in which titanium silicon molecular sieve (G): tetradecyl trimethyl ammonium bromide (mol): tetrapropyl ammonium hydroxide (mol): hydrazine hydrate (mol): ammonium chloride palladium complex (g, based on palladium): water (Mole)=100:0.01:0.4:2.0:2.0:2000. Then it was put into a stainless steel sealed reactor and hydrothermally treated at a temperature of 150°C and autogenous pressure for 48 hours. The resultant was filtered, washed with water, dried naturally, and dried at 180°C for 3 hours. The sample number obtained was C.

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PUM

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Abstract

The invention provides a post-treatment method of a titanium-silicon molecular sieve material. The method comprises the following steps of: adding titanium-silicon molecular sieves into an alkali aqueous solution containing a protectant, a noble metal source and a reducer, or adding titanium-silicon molecular sieves and a reducer to an alkali aqueous solution containing a protectant and a noble metal source; putting the mixture in a reaction kettle for reaction under a condition of hydrothermal treatment; and recovering the products. Compared with the prior art, when the titanium-silicon molecular sieve material treated by the method is used in the oxidizing reaction, such as the epoxidation of propylene, the conversion rate of the propylene, the selectivity of propylene oxide and the catalytic stability are obviously improved.

Description

technical field [0001] The invention relates to a post-treatment method of titanium-silicon molecular sieves, and more particularly relates to a method for treating titanium-silicon molecular sieves with compounds containing noble metals. Background technique [0002] Titanium-silicon molecular sieve is a new type of heteroatom molecular sieve developed in the early 1980s. At present, TS-1 with MFI structure, TS-2 with MEL structure, MCM-22 with MWW structure and TS-48 with larger pore structure have been synthesized. Among them, the titanium-silicon molecular sieve TS-1 developed and synthesized by the Italian company Enichem is a new type of titanium-silicon molecular sieve with excellent catalytic selective oxidation performance formed by introducing the transition metal element titanium into the molecular sieve framework with a ZSM-5 structure. TS-1 not only has the catalytic oxidation effect of titanium, but also has the shape-selective effect and excellent stability o...

Claims

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Application Information

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IPC IPC(8): B01J29/89C07D301/08
Inventor 史春风林民朱斌舒兴田慕旭宏罗一斌汪燮卿汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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