Carbon-based palladium catalyst obtained by using ionic liquid, method for preparing the same and hydrogenation of hydrofluorocarbon using the same

Patent metadata

Field	Value
Publication number	US-9238216-B2
Application number	US-201314059007-A
Country	US
Kind code	B2
Filing date	Oct 21, 2013
Priority date	Aug 7, 2013
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

Provided is a palladium on carbon (Pd/C) catalyst obtained by using an ionic liquid, a method for preparing the same, and a method for hydrogenation of hydrofluorocarbon using the same. More particularly, palladium particles are supported on carbon particles by using an ionic liquid, and the resultant Pd/C catalyst is used for hydrogenation of hydrofluorocarbon. The catalyst includes palladium particles having a smaller particle size and a more uniform shape as compared to the existing Pd/C catalysts, and thus shows high catalytic activity.

First claim

What is claimed is:

1. A method for preparing a carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon, the method comprising the steps of:
(a) adding a palladium precursor to distilled water to provide an aqueous solution;
(b) adding an ionic liquid to the aqueous solution of (a), wherein the ionic liquid is 1 hexyl-3-methylimidazolium hexafluorophosphate;
(c) adding carbon particles to the mixed solution of (b);
(d) adding an aqueous solution of a reducing agent dropwise to the mixed solution of (c);
(e) heating the mixed solution of (d) at 80-120° C. for 1-3 hours to obtain powder of the Pd/C catalyst; and
(f) washing the Pd/C catalyst with an organic solvent, followed by drying at 50-100° C. and sintering at 200-600° C. for 1-3 hours.

2. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the Pd/C catalyst has a small and uniformly controlled particle size by adding an ionic liquid when the carbon particles are impregnated with palladium particles.

3. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 2 , wherein the palladium particles have an average particle diameter of 1-100 nm.

4. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the palladium precursor and the ionic liquid are respectively used in a molar ratio of 0.1-3.

5. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the ionic liquid further comprises at least one selected from the group consisting of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-octyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-octyl-1-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate and 1-hexyl-3-methylimidazolium trifluoromethanesulfonate.

6. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the content of palladium is 0.9-5 wt % of the carbon particles.

7. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the hydrogenation is carried out at a temperature of 80-200° C. under a pressure of 0.1-2 atm.

8. The method for preparing the carbon-based palladium (Pd/C) catalyst for hydrogenation of hydrofluorocarbon according to claim 1 , wherein the hydrofluorocarbon is hexafluoropropylene (HFP) and 1,2,3,3,3-pentafluoropropene.

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Chang Soo
• Yoo Kyesang
• Ahn Byoung Sung
• Lee Hyun Joo
• Ha Jeong Myeong
• Kim Hong Gon

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/393

  Metal or metal oxide crystallite size · CPC title

• B01J23/44 Primary

  Palladium · CPC title