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

A method for preparing monofluoromethane with PD-M alloy supported catalyst

A supported catalyst, fluoromethane technology, applied in the field of single-atom alloy catalyst preparation, can solve the problems of low conversion rate of gas-phase fluorination synthesis route, by-product methane has no economic value, unsatisfactory catalyst life, etc., to achieve environmental protection of synthesis process route , Moderate hydrogenation capacity, moderate acid-base performance

Active Publication Date: 2022-03-01
ZHEJIANG UNIV OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and convenient, the use of carbon nanotubes as a catalyst carrier has high production costs and unsatisfactory catalyst life, making it difficult to realize industrialization
[0006] The above process route for synthesizing HFC-41 has the following defects. The conversion rate of the gas phase fluorination synthesis route is low, and it is more dangerous to use HF. Once it leaks, it may cause serious consequences, and the heavy metal chromium-based catalyst is used. Eliminated Heavy Metal Catalysts
In the existing hydrodechlorination synthesis route, under the condition of using noble metal catalysts, the selectivity of HFC-41 is below 60%, which increases the cost of separation in the later stage, and the generated by-products such as methane have basically no economic value, resulting in waste of resources

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 39mL of 0.02mol / L Cu(NO 3 ) 2 ·3H 2 O aqueous solution, 50mL of 0.01mol / L PVP aqueous solution and 50mL of 0.1mol / L ascorbic acid aqueous solution were mixed and placed under nitrogen atmosphere and stirred for 0.5h. Then add 10 mL of 0.1 mol / L sodium borohydride aqueous solution dropwise to the mixed solution, and continue stirring for 0.5 h; then add 1 g of AlF to the above solution 3 powder, continue to stir for 0.5~1h, ultrasonic for 5 minutes; filter, dry for 12h, and then place the dried solid in air at 300°C for 4h to obtain Cu / AlF 3 ; The above-baked Cu / AlF 3 After calcination and reduction at 250°C under a hydrogen atmosphere for 2 hours, passivation was calcined at 250°C for 1 hour under a nitrogen atmosphere, cooled to room temperature, and then placed in 9.4mL palladium nitrate aqueous solution (the concentration of palladium element is 0.0001mol / L) under a nitrogen atmosphere Continue to stir for 0.5~1h, the temperature of the mixed solution is 50°C, an...

Embodiment 2

[0029] Mix 18mL of 0.02mol / L ZnCl aqueous solution, 50mL of 0.01mol / L PVP aqueous solution and 50mL of 0.1mol / L sodium citrate aqueous solution and stir for 2h under a nitrogen atmosphere. The flow rate is 10mL / min. Then, 10 mL of 0.1 mol / L sodium borohydride aqueous solution was added dropwise to the mixture, and stirring was continued for 1 h; then 1 g of MgF 2 powder, continue to stir for 0.5~1h, ultrasonic for 5 minutes; filter, dry for 12h, and then place the dried solid in air at 300°C for 4h to obtain Zn / MgF 2 ; The above-mentioned roasted Zn / MgF 2 After calcination and reduction at 250°C under a hydrogen atmosphere for 2 hours, passivation was calcined at 250°C for 1 hour under a nitrogen atmosphere, cooled to room temperature, and then placed in 9.4mL aqueous solution of chloropalladium acid under a nitrogen atmosphere (the concentration of palladium element is 0.0001mol / L) Stirring was continued for 0.5~1h, the temperature of the mixture was 50°C, and the flow rate...

Embodiment 3

[0032] Mix 18mL of 0.02mol / L ZnCl aqueous solution, 50mL of 0.01mol / L PVP aqueous solution and 50mL of 0.1mol / L sodium citrate aqueous solution and stir under a nitrogen atmosphere for 0.5~1h. The temperature of the mixed solution is 50°C. The flow rate of nitrogen is 10mL / min. Then add 10mL of 0.1mol / L sodium borohydride aqueous solution to the mixture dropwise, and continue to stir for 0.5~1h; then add 1g of MgF to the above solution 2 powder, continue to stir for 0.5~1h, ultrasonic for 5 minutes; filter, dry for 12h, and then place the dried solid in air at 300°C for 4h to obtain Zn / MgF 2 ; The above-mentioned roasted Zn / MgF 2 After being reduced for 2 hours under a hydrogen atmosphere at 250°C, passivation was calcined at 250°C for 1 hour under a nitrogen atmosphere, cooled to room temperature, and then placed in 9.4mL palladium nitrate aqueous solution (the concentration of palladium element is 0.0001mol / L) under a nitrogen atmosphere to continue Stir for 0.5~1h, the te...

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 method for preparing monofluoromethane with a Pd-M alloy supported catalyst. The preparation method of the catalyst of the present invention is as follows: first load the metal M nanoparticles on the carrier, then mix and stir the Pd precursor aqueous solution, prepare monodispersed Pd atoms on the M metal through a displacement reaction, and combine the Pd atoms with the M metal by roasting. The metals are combined to form a Pd-M alloy to obtain the monodisperse Pd-M alloy supported catalyst, wherein the metal M can be Cu, Zn, Ni, Ru, Sn or Fe. Compared with single, double and multi-component non-alloy catalysts, when the Pd-M alloy supported catalyst of the present invention is used to catalyze hydrodechlorination of chlorofluoromethane to prepare monofluoromethane, it is more effective for monofluoromethane (HFC-41 ) has a higher selectivity, which can reach about 95%, and the catalyst is not easy to deposit carbon, and has a longer life (within 1000h, the activity decreases within 10%, and the selectivity decreases within 5%). The process route of fluoromethane is simple, environmentally friendly and safe.

Description

technical field [0001] The invention relates to the technical field of preparation of a single-atom alloy catalyst, in particular to a method for preparing monofluoromethane with a Pd-M alloy supported catalyst. Background technique [0002] Monofluoromethane (HFC-41) is a colorless, flammable gas with low greenhouse effect potential and zero ozone depletion potential. It is one of the few saturated hydrofluorocarbons that meets EU standards for use. In addition, it can be used as a selective fluoromethylation reagent for organic molecules in organic synthesis and drug synthesis, and is also used as a raw material for the production of important pesticide intermediates, bromofluoromethane. High-purity HFC-41 gas is a green, high-efficiency new etching gas (ODP value 0, GWP value 97), which can be used for etching semiconductor and electronic products, such as selectively etching silicon compound films. [0003] Patent CN200580031247.9 discloses using monochloromethane as a ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/23C07C19/08B01J27/13B01J23/62B01J23/89B01J23/58
Inventor 唐浩东周楠张庆韩文锋李瑛刘宗健
Owner ZHEJIANG UNIV OF TECH
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