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

Hydrogenation catalyst

a hydrogenation catalyst and catalyst technology, applied in the field of hydrogenation catalysts, can solve the problems of catalyst deactivation, change in catalyst structure, limiting useful life, etc., and achieve the effect of reducing the number of catalyst pellets

Inactive Publication Date: 2011-02-03
HONEYWELL INT INC
View PDF15 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the occurrence of hydrogenolytic cleavage of the carbon-fluorine bond, a small amount of HF is generated during hydrogenation of fluoroolefin which can attack the transition alumina catalyst support causing catalyst structure change and catalyst deactivation.
Thus, all known transition alumina supports for metal catalysts are inclined to be attacked by HF in the hydrogenation of fluoroolefins, thereby limiting the useful lifetime.

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
  • Hydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparison of Gamma-Alumina and Alpha-Alumina Supported Pd Catalysts for 1,1,1,2,3,3-hexafluoropropene hydrogenation

[0032]0.5 wt % Pd / gamma-alumina and 0.5 wt % Pd / alpha-alumina, which have a specific surface area of 243 and 33 m2 / g, respectively, were compared for 1,1,1,2,3,3-hexafluoropropene (HFP) hydrogenation. About 2 g of catalyst diluted with 20 ml of Monel packing was charged into a ¾″ Monel tube reactor and was in-situ reduced in 10% H2 / N2 flow for 2 hours at 200° C. HFP was fed into reactor at a rate of 5 g / h, and H2 was co-fed according to a mole ratio of H2 / HFP equal to 1.5. As shown in Table 2, both catalysts initially provided a near complete HFP conversion and a 236ea selectivity of above 99.5%. Nevertheless, as shown in FIG. 1, while no deactivation was noted over the 0.5 wt % Pd / alpha-alumina catalyst even after 1000 h on stream, rapid deactivation was observed over the 0.5 wt % Pd / gamma-alumina beginning around 600 h on stream. This indicates that the alpha-alumina...

example 2

Hydrogenation of 1,1,1,2,3,3-hexafluoropropene Over Alpha-Alumina Supported Pd Catalyst

[0033]0.5 wt % Pd / alpha-alumina catalyst, which has a specific surface area of 33 m2 / g, was used for 1,1,1,2,3,3-hexafluoropropene (HFP) hydrogenation. About 1 g of catalyst diluted with 10 ml of Monel packing was charged into a ¾″ Monel tube reactor and was in-situ reduced in 10% H2 / N2 flow for 2 hours at 200° C. HFP was fed into reactor at a rate of 65 g / h, and H2 was co-fed according to a mole ratio of H2 / HFP equal to 1.5. GC analysis of the product stream showed that the catalyst provided an HFP conversion of around 55% and a 245eb selectivity of about 99.5%. No deactivation was noted during the period of time of the test which lasted for 800 hours, indicating the alpha-alumina supported Pd catalyst can provide stable activity for HFP hydrogenation.

example 3

Hydrogenation of 1,1,1,2,3-pentafluoropropene Over Alpha-Alumina Supported Pd Catalyst

[0034]0.5 wt % Pd / alpha-alumina catalyst, which has a specific surface area of 33 m2 / g, was used for 1,1,1,2,3-pentafluoropropene (1225ye) hydrogenation. About 0.5 g of catalyst diluted with 10 ml of Monel packing was charged into a ¾″ Monel tube reactor and was in-situ reduced in 10% H2 / N2 flow for 2 hours at 200° C. 1225ye was fed into reactor at a rate of 30 g / h, and H2 was co-fed according to a mole ratio of H2 / 1225ye equal to 1.5. GC analysis of the product stream showed that the catalyst provided a 1225ye conversion of around 45% and a 245eb selectivity of about 98.5%. No deactivation was noted during the period of time of the test which lasted for 800 hours, indicating the alpha-alumina supported Pd catalyst can provide stable activity for 1225ye hydrogenation.

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
temperaturesaaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

An alpha-alumina support for a hydrogenation catalyst useful in hydrogenating fluoroolefins is provided.

Description

BACKGROUND[0001]1. Field of Invention[0002]The present invention relates to catalysts for hydrogenating olefins. More particularly, this invention relates to supported catalyst for hydrogenating fluoroolefins.[0003]2. Description of Prior Art[0004]Catalytic hydrogenation of fluoroolefins is frequently used in producing hydrofluorocarbons as useful products and / or intermediates. Various metals, such as Pd, supported on a substrate have long been recognized as highly effective hydrogenation catalysts. These catalysts are particularly effective in gas-phase reactions. Alumina is known as a support for these catalysts. Alumina has several different phases, typically designated by different Greek letters, e.g., alpha (α) (also known as corundum), beta (β), chi (χ), kappa (κ), eta (η), theta (θ), delta (δ), and gamma (λ). Each has a unique crystal structure and properties. For example, alpha alumina is composed of hexagonal crystals, whereas gamma alumina is composed of cubic crystals. (h...

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 Applications(United States)
IPC IPC(8): B01J21/04C07C19/08
CPCB01J21/04B01J23/36B01J23/40B01J23/44B01J23/48B01J32/00B01J35/1014B01J37/18C07C17/354B01J23/70C07C19/08B01J35/613B01J23/38C07C17/25
Inventor WANG, HAIYOUTUNG, HSUEH SUNGMERKEL, DANIEL C.
Owner HONEYWELL INT INC
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