Method for modifying titanium silicate molecular sieve material

A titanium-silicon molecular sieve and modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, non-metallic elements, etc., can solve the problems of poor catalyst stability and low catalyst activity, and achieve the goal of improving catalytic oxidation activity and catalytic oxidation performance Effect

Active Publication Date: 2010-03-03
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 o 2 Intermediates in adjacent Ti 4+ Epoxidized propylene on the position to generate propylene oxide. Although the reaction conditions are mild and the selectivity is good, there are defects such as low catalyst activity and poor catalyst stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 20 grams of titanium-silicon molecular sieve TS-1, hydrazine hydrate, ammonium nitrate palladium complex and cetyl trimethyl ammonium bromide and add to the water, stir and mix, wherein titanium-silicon molecular sieve (gram): cetyl trimethyl bromide. Methylammonium bromide (mol): hydrazine hydrate (mol): ammonia palladium nitrate complex (g, calculated as palladium): water (g) = 100:0.05:0.5:2.0:600. Then, after stirring evenly at 50°C, properly sealed and placed for 5 hours, the resultant was filtered, washed with water, dried naturally, and calcined at 300°C for 5 hours in a mixed atmosphere of hydrogen and nitrogen to obtain a modified titanium-silicon molecular sieve. Material A.

Embodiment 2

[0031] Add 20 grams of titanium-silicon molecular sieve TS-1, sodium citrate, palladium chloride and polyacrylpyrrolidone into the water and stir and mix evenly, wherein titanium-silicon molecular sieve (gram): polyacrylpyrrolidone (mol): sodium citrate (mol): Palladium chloride (g, calculated as palladium): water (g) = 100: 0.9: 0.1: 5.0: 1800. Then, after stirring evenly at 30°C, properly sealed and placed for 1 hour, the resultant was filtered, washed with water, dried naturally, and calcined at 150°C in a mixed atmosphere of hydrogen and nitrogen for 10 hours to obtain a modified titanium-silicon molecular sieve. Material B.

Embodiment 3

[0033] Get 20 grams of titanium-silicon molecular sieve TS-1, sodium borohydride, palladium acetate and Tween 80 and add to water and stir and mix evenly, wherein titanium-silicon molecular sieve (gram): protective agent (mol): reducing agent (mol): palladium source ( grams, calculated as palladium): water (grams)=100: 0.5: 0.8: 0.02: 1500, then after stirring evenly at 70°C, after being properly sealed and placed for 10 hours, the resultant was filtered, washed with water, and after natural drying, And calcined at 550° C. for 1 hour in a hydrogen-nitrogen mixed atmosphere to obtain the modified titanium-silicon molecular sieve material C.

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PUM

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Abstract

The invention discloses a method for modifying a titanium silicate molecular sieve material. In the method, titanium silicate molecular sieves, a reducer, a precious metal source and a protective agent are added into water, the mixture is mixed and stirred at 0 to 100 DEG C, and the product is recovered. The method is improved on the basis of the conventional loading process and is simple and easily implementable in operation, and the product obtained by the method is high in activity and stability.

Description

technical field [0001] The present invention relates to a method for modifying a titanium-silicon molecular sieve material, in particular to a method for modifying a titanium-silicon molecular sieve material with a compound containing a precious metal. Background technique [0002] Titanium silica 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 Italian Enichem Company 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 ZSM-5 structure. TS-1 not only has the catalytic oxidation effect of titanium, but also has the shape-selective effect and excellent stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C01B15/022
Inventor 林民史春风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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