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Modification method of Au/TS-1 catalyst

A TS-1, catalyst technology, applied in the field of modification of selective oxidation catalysts, can solve the problems of poor repeatability and poor performance of the preparation method

Pending Publication Date: 2020-10-27
CHENGDU ZHONGKE CATALYSIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present disclosure provides a method for modifying Au / TS-1 catalyst, which solves the problems of poor performance of the catalyst prepared in the prior art for converting propylene into propylene oxide and poor repeatability of the preparation method

Method used

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  • Modification method of Au/TS-1 catalyst
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  • Modification method of Au/TS-1 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Step 1) Preparation of Au / TS-1

[0074] At 40°C, add 8 mL of 20 mg / mL HAuCl to 22 g of deionized water 4 solution and 1 g of commercially available TS-1 powder to obtain a mixture. The mixture was stirred for 30 minutes to obtain a homogeneous mixture. The Cs of 10wt% (mass percentage concentration) is then added dropwise in the mixture 2 CO 3 solution, make the pH of the mixed solution reach 7-8, and continue to stir for 1.5 hours; then again with 10wt% Cs 2 CO 3 The solution adjusted the pH=8 of the mixed solution, and continued to stir for 3.5 hours to make the HAuCl 4 The Au ions in the mixture of solution and TS-1 powder were fully precipitated on the carrier TS-1. Then the liquid was poured by centrifugation, the solid was collected, and washed three times with 100 g of deionized water in total, and then the washed solid was dried under vacuum at 30° C. until the sample had constant weight to obtain Au / TS-1 sample 1.

[0075] Step 2) Prepare X 2 CO 3 -Au / ...

Embodiment 2

[0093] Step 1) Preparation of Au / TS-1

[0094] At 40°C, add 8 mL of 20 mg / mL HAuCl to 22 g of deionized water 4 solution, stirred for 30 minutes; then 10wt% Cs was added dropwise 2 CO 3 solution, so that the pH of the mixed solution reaches 7-8. Then, 1.000 g of TS-1 powder was added and stirred for 1.5 hours. Then again with 10wt%Cs 2 CO 3 The solution was adjusted to pH=8 of the mixed solution, and stirring was continued for 3.5 hours. The liquid was poured by centrifugation, the solid was collected, and washed three times with a total of 100 g of deionized water. The washed solid was dried under vacuum at 30° C. until the sample had constant weight, and Au / TS-1 sample 2 was obtained.

[0095] Step 2) Prepare X 2 CO 3 -Au / TS-1

[0096] Take Au / TS-1 sample 2, prepare according to the same process as step 2) in Example 1, and obtain the target product——X2 CO 3 - Au / TS-1 sample B series.

[0097] Step 3) X 2 CO 3 -Activation treatment of Au / TS-1

[0098] Follow th...

Embodiment 3

[0106] Step 1) Preparation of Au / TS-1

[0107] At 40°C, add 8 mL of 20 mg / mL HAuCl to 22 g of deionized water 4 Solution and TS-1 powder 1.000g, stirred for 30 minutes. Then add 10wt% NaOH solution dropwise to make the pH of the mixed solution reach 7-8, and stir for 1.5 hours; then adjust the pH of the mixed solution to 8 with 10wt% NaOH solution again, and continue stirring for 3.5 hours. The liquid was poured by centrifugation, the solid was collected, and washed three times with 100 g of deionized water in total, and then the washed solid was dried under vacuum at 30° C. until the sample had constant weight, and Au / TS-1 sample 3 was obtained.

[0108] Step 2) Prepare X 2 CO 3 -Au / TS-1

[0109] Take Au / TS-1 sample 3, prepare according to the same process as step 2) in Example 1, and obtain the target product——X 2 CO 3 -Au / TS-1 sample C series.

[0110] Step 3) X 2 CO 3 -Activation treatment of Au / TS-1

[0111] Follow the same process as step 3) in Example 1.

[0...

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Abstract

The invention relates to the field of chemical catalysis, in particular to a modification method of a selective oxidation catalyst. The modification method comprises the following steps: (1) loading an active component Au on a carrier TS-1 to prepare an Au / TS-1 catalyst; (2) impregnating the Au / TS-1 catalyst with a solution of alkali metal carbonate X2CO3, and then drying to obtain a modified catalyst X2CO3-Au / TS-1, wherein the molar ratio of the X2CO3 to the active component Au loaded on the Au / TS-1 catalyst ranges from 20: 1 to 1: 5; and (3) carrying out activation treatment on the modifiedcatalyst X2CO3-Au / TS-1 before the reaction. According to the present invention, the method for modifying Au / TS-1 through alkali carbonate impregnation is adopted, and the prepared X2CO3-Au / TS-1 catalyst has characteristics of high catalytic performance and long service life; and the preparation method has good repeatability.

Description

technical field [0001] The disclosure relates to the field of chemical catalysis, in particular to a method for modifying a selective oxidation catalyst. Background technique [0002] Propylene oxide (PO) is the third largest propylene derivative after polypropylene and acrylocyanide, and is mainly used in the synthesis of polyurethane and propylene glycol. Compared with the traditional chlorohydrin method, co-oxidation method and hydrogen peroxide direct oxidation method, the direct use of H 2 , O 2 And propylene, the gas-phase epoxidation of propylene under Au / TS-1 catalysis has the advantages of cheap and easy-to-obtain raw materials, simple operation, and environmental friendliness, and is favored by people. In 1998, Japanese scholar Harut (Journal of Catalysis: 1998, 178 (2): 566-575) in anatase TiO 2 The gold nanoparticles on it can catalyze the H 2 and O 2 Gas-phase epoxidation of propylene under co-existing conditions to obtain propylene oxide with a selectivity...

Claims

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Application Information

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IPC IPC(8): B01J29/89B01J37/02C07D301/10C07D303/04
CPCB01J29/89B01J37/0201C07D301/10C07D303/04B01J2229/186B01J2229/20
Inventor 陈洪林伏劲松张小明雷骞
Owner CHENGDU ZHONGKE CATALYSIS TECH CO LTD
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