Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Zirconium-based catalyst for propylene epoxidation reaction and preparation method thereof

An epoxidation reaction and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of complex catalyst preparation methods and no obvious improvement in PO selectivity, etc. problem, to achieve the effect of broad market application prospects, environmental friendliness, and simple process

Pending Publication Date: 2021-03-16
YANTAI UNIV
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current work focuses on the preparation and modification of titanium-based material-supported gold catalysts, and there are only a few reports on non-titanium-supported catalysts for this reaction. For example, Su Weiguang et al. reported that ZnO-CuOx / SiO 2 used for this reaction, but 260 o Under C high temperature, the conversion rate of propylene is lower than 1%, and the target product PO selectivity is lower than 20%, even after using Na modification, although the conversion rate of propylene can be increased to 2%, the PO selectivity still has no obvious improvement, and The catalyst preparation method is complex

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Zirconium-based catalyst for propylene epoxidation reaction and preparation method thereof
  • Zirconium-based catalyst for propylene epoxidation reaction and preparation method thereof
  • Zirconium-based catalyst for propylene epoxidation reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: DP method prepares 1.0%Au / Zr-MFI-35 catalyst, and its preparation steps are as follows:

[0038] Weigh 2 g of Tween 20 (Tween 20, CP) and dissolve it in deionized water, add an appropriate amount of tetrapropylammonium hydroxide (TPAOH, 25%wt%) under stirring conditions, and measure 38.6 mL of ethyl orthosilicate (TEOS, AR) was slowly added to the above solution, stirred vigorously for 1 h, 2.3 g tetrabutyl zirconate was dissolved in 20 mL isopropanol (IPA), added dropwise to the above solution, and stirred vigorously for 1 h. 170 o C crystallized under normal pressure for 18 h, cooled to room temperature, washed several times with deionized water and ethanol, and 60 o C vacuum drying, 550 o C is calcined, and the obtained molecular sieve is recorded as Zr-MFI-35 carrier.

[0039] Take 0.02 gHAuCl 4 . 4H 2 O was added to 5 mL of distilled water, and 1 g of the above-prepared Zr-MFI-35 carrier was added. After stirring for 30 min, the 2 CO 3 Adjust ...

Embodiment 2

[0044] Embodiment 2: IMP method prepares 0.5%Au / Zr-MFI-35 catalyst, and its preparation steps are as follows:

[0045] Weigh 2 g of Tween 20 (Tween 20, CP) and dissolve it in deionized water, add an appropriate amount of tetrapropylammonium hydroxide (TPAOH, 25%wt%) under stirring conditions, and measure 38.6 mL of ethyl orthosilicate (TEOS, AR) was slowly added to the above solution, stirred vigorously for 1 h, 2.3 g tetrabutyl zirconate was dissolved in 20 mL isopropanol (IPA), added dropwise to the above solution, and stirred vigorously for 1 h. 170 o C crystallized under normal pressure for 18 h, cooled to room temperature, washed several times with deionized water and ethanol, and 60 o C vacuum drying, 550 o C is calcined, and the obtained molecular sieve is recorded as Zr-MFI-35 carrier.

[0046] Calculate the amount of gold solution, KOH solution and distilled water required for a theoretical gold loading of 1.0%. Measure a certain amount of HAuCl 4 ·3H 2 O soluti...

Embodiment 3

[0050] Embodiment 3: IMP method prepares 1.0%Au / Zr-MFI-60 catalyst, and its preparation steps are as follows:

[0051] Weigh 1.5 g of Tween 20 (Tween 20, CP) and dissolve it in deionized water, add 42.5 g of tetrapropylammonium hydroxide (TPAOH, 25%wt%) into the flask, and measure 38.6 mL of ethyl orthosilicate ( TEOS, AR) was slowly added to the above solution, stirred vigorously for 1 h, slowly and uniformly added 0.8869 g of zirconium ethylate dropwise to the above solution, and stirred vigorously for 1 h. 170 o C crystallized under normal pressure for 18 h, cooled to room temperature, washed several times with deionized water and ethanol, and 60 o C vacuum drying, 550 o C was calcined for 3 h to obtain a Zr-MFI-60 support with n(Si / Zr)=60.

[0052] Take 0.02 gHAuCl 4 . 4H 2 Add O to 0.12 mL of distilled water, adjust the pH value to 9 with KOH solution, then add the ZS(60) carrier prepared above, oscillate rapidly, and let it stand for 4 h; wash with distilled water ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a zirconium-based catalyst for propylene epoxidation reaction and a preparation method thereof. The catalyst takes a zirconium-based material as a carrier and comprises ZrO2 and a zirconium-silicon molecular sieve. After a zirconium-containing precursor is obtained by a precipitation method, ZrO2 carriers with different crystal phases are obtained by changing the roasting temperature. The zirconium-silicon molecular sieve is prepared by taking Tween as a template agent and utilizing tetrabutyl zirconate and tetraethyl orthosilicate to perform hydrolyzing, crystallizingand roasting. The gold loading mode selects an isopyknic impregnation or deposition precipitation method. When the catalyst is used for propylene epoxidation reaction, high selectivity of propylene oxide can be ensured at low temperature, complete oxidation of propylene is avoided, the conversion rate of propylene is expected to be improved after appropriate addition of auxiliaries, and meanwhile,the high-temperature selectivity of propylene oxide is improved. Therefore, the type of the catalyst carrier for the reaction is expanded, and the catalyst has a wide application prospect.

Description

technical field [0001] The invention relates to a gold catalyst and a preparation method thereof, in particular to a supported nano-gold catalyst used for propylene epoxidation to synthesize propylene oxide and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is the third largest propylene derivative after polypropylene and acrylonitrile, and is mainly used in the production of polyether, propylene glycol, etc. It is the main raw material for fourth-generation detergents, non-ionic surfactants, oil field demulsifiers, pesticide emulsifiers, etc. It is also an important raw material for fine chemical products, and nearly 100 downstream products have been produced. [0003] At present, the production methods of propylene oxide mainly include the chlorohydrin method and the co-oxidation method. The two methods account for 99% of the world's total production capacity. The chlorohydrin process is divided into two steps. In the first step, chlorin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J21/06B01J23/52B01J29/89C07D301/10C07D303/04
CPCB01J29/89B01J23/52B01J21/066C07D301/10C07D303/04B01J2229/18
Inventor 祁彩霞郑玉华苏慧娟孙逊孙立波
Owner YANTAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com