A metal-doped hydroxyapatite catalyst

Patent metadata

Field	Value
Publication number	US-2016052851-A1
Application number	US-201414780678-A
Country	US
Kind code	A1
Filing date	Mar 28, 2014
Priority date	Mar 28, 2013
Publication date	Feb 25, 2016
Grant date	—

Abstract

The present invention provides the use of a metal-doped hydroxyapatite catalyst for highly selective conversion of an alcohol to an aldehyde at low temperatures. More specifically, the invention provides the use of a silver-doped hydroxyapatite catalyst for the highly selective oxidative dehydrogenation of ethanol to acetaldehyde. The present invention also provides the method for converting ethanol to acetaldehyde using a silver-doped hydroxyapatite catalyst.

First claim

1 . A use of a metal-doped hydroxyapatite as a catalyst for converting an alcohol to an aldehyde.

2 . The use according to claim 1 , wherein the dopant of the metal-doped hydroxyapatite is selected from the group consisting of a metal, a metal oxide and mixtures thereof.

3 . The use according to claim 2 , wherein the metal is a transition metal or a group 3, group 4, group 5, group 6, group 10, group 11 or group 12 transition metal.

4 . (canceled)

5 . The use according to claim 3 , wherein the transition metal is silver, gold, vanadium or chromium.

6 . (canceled)

7 . The use according to claim 2 , wherein the metal oxide is an oxide of a transition metal or an oxide of a group 3, group 4, group 5, group 6, group 10, group 11 or group 12 transition metal.

8 . (canceled)

9 . The use according to claim 7 , wherein the oxide of a transition metal is silver oxide, gold oxide, vanadium oxide or chromium oxide.

10 . (canceled)

11 . The use according to claim 1 , wherein the hydroxyapatite is doped with the metal, metal oxide or mixtures thereof, at an atomic percentage up to 10 at % or up to 6 at %.

12 . (canceled)

13 . The use according to claim 1 , wherein the hydroxyapatite is a stoichiometric hydroxyapatite or a non-stoichiometric hydroxyapatite.

14 . (canceled)

15 . The use according to claim 13 , wherein the non-stoichiometric hydroxyapatite has a Ca/P molar ratio in the range of 1.45 to 1.70 or 1.50 to 1.65.

16 . (canceled)

17 . The use according to claim 1 , wherein the converting step comprises oxidising the alcohol to the aldehyde, wherein the oxidising step comprises an oxidative dehydrogenation reaction of the alcohol to the aldehyde.

18 . (canceled)

19 . The use according to claim 1 , wherein the alcohol is a lower alcohol of 1 to 6 carbon atoms, or ethanol.

20 . (canceled)

21 . The use according to claim 1 , wherein the aldehyde is a lower aldehyde of 1 to 6 carbon atoms, or acetaldehyde.

22 . (canceled)

23 . A method for converting an alcohol to an aldehyde, comprising the step of contacting the alcohol with a metal-doped hydroxyapatite catalyst according to claim 1 , to form the aldehyde.

24 . The method according to claim 23 , wherein the contacting step is performed at a temperature in the range of 150° C. to 350° C. or 200° C. to 275° C.

25 . (canceled)

26 . The method according to claim 23 , wherein the contacting step is performed at a pressure in the range of 1 atm to 20 atm or at 1 atm.

27 . (canceled)

28 . The method according to claim 23 , wherein the contacting step is performed at a weight hourly space velocity (WHSV) in the range of 1 h −1 to 10 h −1 or 4 h −1 to 7 h −1 .

29 . (canceled)

30 . The method according to claim 23 , wherein the contacting step comprises the step of oxidising the alcohol to the aldehyde, wherein the oxidising step comprises an oxidative dehydrogenation reaction of the alcohol to aldehyde.

31 . (canceled)

32 . The method according to claim 23 , wherein the alcohol is a lower alcohol of 1 to 6 carbon atoms or ethanol.

33 . (canceled)

34 . The method according to claim 23 , wherein the aldehyde is a lower aldehyde of 1 to 6 carbon atoms or acetaldehyde.

35 . (canceled)

Assignees

• Agency Science Tech & Res
• Univ Nanyang Tech

Inventors

• Ramesh Kanaparthi
• Borgna Armando
• Goh Yi Ling Eileen
• White Timothy John

Classifications

• B01J27/1817

  with copper, silver or gold · CPC title

• C07C45/38 Primary

  being a primary hydroxyl group · CPC title

• B01J27/198

  Vanadium · CPC title

• B01J23/50

  Silver · CPC title

• B01J27/1806

  with alkaline or alkaline earth metals · CPC title