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

A nickel phosphide catalyst for the preparation of 2,3,3,3-tetrafluoropropene by gas phase selective hydrodechlorination

A technology of selective hydrogenation and tetrafluoropropene, applied in physical/chemical process catalysts, dehydrohalogenation preparation, organic chemistry, etc., can solve the problems of increased reaction process costs, reduced selectivity of target products, etc., and achieve high temperature anti-sintering ability Good, low raw material cost effect

Active Publication Date: 2021-10-01
XIAN MODERN CHEM RES INST
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation methods disclosed in these several patents, although 1,1-dichloro-2,3,3,3-tetrafluoropropene or 1-chloro-2,3,3,3-tetrafluoropropene can be directly mixed with hydrogen One-step reaction to prepare 2,3,3,3-tetrafluoropropene, but in the actual reaction process, the double bond in the raw material compound will preferentially react with hydrogen to form saturated chlorofluoroalkanes, resulting in a decrease in the selectivity of the target product
At the same time, the active components of the catalyst used are all noble metals, and the reaction raw materials also need to be prepared through complicated steps, resulting in an increase in the cost of the entire reaction process

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
  • A nickel phosphide catalyst for the preparation of 2,3,3,3-tetrafluoropropene by gas phase selective hydrodechlorination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: prepare Ni 2 P / oxide (fluoride, molecular sieve) catalyst

[0023] 9.48g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 3.45g diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) was added to 20 mL of deionized aqueous solution, and then the pH of the solution was adjusted to 2-3 with concentrated nitric acid to obtain a clear green solution. According to the loading of 0.5%, 5%, 10%, 20%, and 30%, the above solutions are impregnated onto a certain mass of oxides, fluorides, or molecular sieves, and then aged at room temperature for 12 hours, dried at 120 ° C for 12 hours to dry the water, and Calcined at 500°C for 3h to obtain the precursor of phosphate. The phosphide catalyst was prepared by in-situ temperature-programmed reduction method. The temperature programming step mainly includes two steps: (1) in H 2 Under the atmosphere (flow rate 150mL / min), the temperature was raised from room temperature to 120°C at 5°C / min, and kept at 120°C for 1h to remove...

Embodiment 2

[0024] Embodiment 2: prepare Ni 12 P 5 / activated carbon catalyst

[0025] 9.48g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.79g diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) was added to 20 mL of deionized aqueous solution, and then the pH of the solution was adjusted to 2-3 with concentrated nitric acid to obtain a clear green solution. According to the loads of 5%, 10%, 20%, and 30%, the above solutions were impregnated on a certain mass of activated carbon, and then aged at room temperature for 12 hours, dried at 120 ° C for 12 h, and roasted at 500 ° C for 3 h in a nitrogen atmosphere to obtain Phosphate precursor. The phosphide catalyst was prepared by in-situ temperature-programmed reduction method. The temperature programming step mainly includes two steps: (1) in H 2 Under the atmosphere (flow rate 150mL / min), the temperature was raised from room temperature to 120°C at 5°C / min, and kept at 120°C for 1h to remove the water adsorbed by the catalyst; (2) fro...

Embodiment 3

[0026] Example 3: Using the catalyst prepared by the method in Example 1 and 2, apply it to the gas phase selective hydrodechlorination of 2-chloro-1,1,1,2-tetrafluoropropane to prepare 2,3,3,3- In the reaction of tetrafluoropropene, after running for 8 hours, the reaction results are as follows:

[0027] Table 1 Conversion rate and product selectivity of HCFC-244bb on nickel phosphide catalysts with different loadings on different carriers for selective hydrodechlorination reaction.

[0028] serial number catalyst HCFC-244bb conversion rate / % HFO-1234yf selectivity / % 1 0.5wt.%Ni 2 P / SiO 2

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

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a nickel phosphide catalyst for preparing 2,3,3,3-tetrafluoropropene through selective hydrodechlorination. The method is to solve the problem that the reaction temperature of 2-chloro-1,1,1,2-tetrafluoropropane is directly removed from hydrogen chloride to prepare 2,3,3,3-tetrafluoropropene, and the catalyst is easily deactivated. The catalyst disclosed by the invention consists of Ni x P y / carrier, where Ni x P y It is a nickel phosphide covalent compound with a crystal structure formed by the combination of metallic nickel and non-metallic element phosphorus. The catalyst in the invention has excellent performance, high activity, good stability, low reaction temperature, effectively reduces reaction energy consumption, and has industrial application value.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for preparing 2,3,3,3-tetrafluoropropene by gas-phase selective hydrogenation dechlorination. It belongs to multiple catalytic technical fields. Background technique [0002] 2,3,3,3-tetrafluoropropene, referred to as HFO-1234yf, the molecular formula is CF 3 CF=CH 2 , non-toxic, non-flammable, ODP is zero, and GWP is about 4. It is considered to be an ideal substitute for HFC-134a and one of the most promising fourth-generation low-carbon refrigerants. [0003] So far, among the many known synthetic methods of HFO-1234yf, 1,1,2,3-tetrachloropropene and anhydrous hydrogen fluoride are mainly used as raw materials to synthesize the target product through a three-step reaction (Chinese patent CN102603465.A), The final step of the reaction is dehydrochlorination by 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) in the presence of a catalyst. Literature (ChemCatChem 2017, 9,824–832) and...

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): B01J27/185C07C17/25C07C21/18
CPCB01J27/1853C07C17/25C07C21/18
Inventor 田松吕剑白彦波贾兆华秦越马辉李晨王博毛伟
Owner XIAN MODERN CHEM RES INST
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