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Preparation method and application method of photo catalyst for high-efficiency photo-catalytic propylene epoxidation material

A photocatalytic propylene and photocatalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor selectivity, low production rate, easy deactivation of catalysts, etc., and achieve good thermal stability , Improve the effect of adsorption and activation, and the preparation process is simple

Inactive Publication Date: 2017-08-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to solve the problems of low PO generation rate, poor selectivity and easy deactivation of the catalyst under photocatalytic conditions, and to provide a catalyst Au-Ag with high catalytic activity for propylene epoxidation under ultraviolet light Preparation and application method of / TS-1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Using tetrabutyl titanate (TBOT) as the source of silicon, tetrabutyl ammonium hydroxide (TPAOH) as the template, and preparing microspherical TS by hydrothermal method with tetraethyl orthosilicate (TEOS) as the silicon source -1 molecular sieve. Take 0.165mL 0.01mol L - 1 HAuCl 4 ·3H 2 O solution was added to 20 mL of deionized water, 0.4 g of TS-1 was added to the above solution, ultrasonicated for 2 h, and aged for 48 h in the absence of light; Calcined for 4h, hydrogen reduction at 400°C for 10h, Au-Ag / TS-1 photocatalyst was obtained. 0.1g catalyst is placed in the fixed-bed reactor, and the volume ratio is 1:1:19 C 3 h 6 , O 2 , Ar mixed gas was passed into the reactor, the reaction temperature was controlled at 170°C, irradiated by a 100W mercury lamp, and the formation rate of PO was measured by gas chromatography to be 64.9μmol·g -1 h -1 .

Embodiment 2

[0025] Example 2: Using tetraethyl orthosilicate (TEOS) as the silicon source, tetrabutyl titanate (TBOT) as the titanium source, and tetrapropylammonium hydroxide (TPAOH) as the template, prepare microspherical TS by hydrothermal method -1 molecular sieve. Take 0.5mL 0.007mol·L -1 AgNO 3 The solution was added to 20mL deionized water, 0.4g of TS-1 was added to the above solution, ultrasonicated for 2h, and aged for 48h in the absence of light; the resulting solution was evaporated to dryness in a water bath at 80°C, and roasted in a muffle furnace at 300°C 4h, hydrogen reduction at 400°C for 10h to obtain Au-Ag / TS-1 photocatalyst. 0.1g catalyst is placed in the fixed-bed reactor, and the volume ratio is 1:1:19 C 3 h 6 , O 2, Ar mixed gas was passed into the reactor, the reaction temperature was controlled at 170°C, irradiated by a 100W mercury lamp, and the formation rate of PO measured by gas chromatography was 56.2 μmol g -1 h -1 .

Embodiment 3

[0026] Example 3: Using tetraethyl orthosilicate (TEOS) as the silicon source, tetrabutyl titanate (TBOT) as the titanium source, and tetrapropylammonium hydroxide (TPAOH) as the template, microspherical TS was prepared by hydrothermal method -1 molecular sieve. The TS-1 catalyst that gets 0.1g is placed in the fixed-bed reactor, and the C that volume ratio is 1:1:19 3 h 6 , O 2 , Ar mixed gas was passed into the reactor, the reaction temperature was controlled at 170°C, irradiated by a 100W mercury lamp, and the formation rate of PO measured by gas chromatography was 52.5μmol·g -1 h -1 .

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Abstract

The invention relates to a preparation method and an application method of a photo catalyst for a high-efficiency photo-catalytic propylene epoxidation material. The preparation method comprises the following processes: preparing a titanium silicon molecular sieve TS-1 carrier by adopting a hydrothermal method and directly supporting Au and Ag bimetals on the carrier by utilizing an impregnation-reduction method to prepare a bimetallic-supported Au-Ag / TS-1 photocatalyst. The prepared photocatalyst is put in a fixed bed reactor; propylene, oxygen and diluent gas are introduced; photo-catalytic reaction is performed by taking a 100W ultraviolet mercury lamp as a light source to prepare propylene epoxide PO. The propylene can be efficiently and highly-selectively converted into the propylene epoxide, and the optimal generation rate and the selectivity of the propylene epoxide are 68.3 mu mol.g<-1>h<-1> and 52.3 percent respectively. The preparation method and the application method provided by the invention have the advantages of being simple in process condition, low in cost, good in repeatability and friendly in environment in the reaction process and can convert the propylene into an industrial product with higher value added.

Description

technical field [0001] The invention relates to the preparation and application of a high-efficiency photocatalytic propylene epoxidation material Au-Ag / TS-1. Under the excitation of ultraviolet light, the photocatalyst can efficiently catalyze the conversion of propylene into propylene oxide, which belongs to the photocatalytic epoxidation technology field. Background technique [0002] Propylene oxide is an important organic chemical product, and it is also the third largest variety of propylene derivatives after polypropylene and acrylonitrile. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products. The main production processes of propy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C07D301/10C07D303/04
CPCC07D301/10C07D303/04B01J29/89B01J35/39Y02P20/52
Inventor 周建成杨斌李乃旭刘明秦一玮郑雨
Owner SOUTHEAST UNIV
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