Temperature Tunable Mesoporous Gold Deposited Co Oxidation Catalyst

Patent metadata

Field	Value
Publication number	US-2016279612-A1
Application number	US-201415033571-A
Country	US
Kind code	A1
Filing date	Nov 3, 2014
Priority date	Nov 1, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

The present invention discloses a novel mesoporous gold deposited oxidation catalyst of formula: XAu-M 0.1 Ce 0.85 Zr 0.05 O 2 wherein X=0.01-10%, M is selected from Cu, Co or Mn and process for the preparation thereof by photodeposition method.

First claim

1 . A mesoporous gold deposited oxidation catalyst of formula Au-M 0.1 Ce 0.85 Zr 0.05 O 2 , characterized in that gold deposited on the catalyst in nano form in the range of 0.01-10 atomic wt % of gold, wherein M is selected from Cu, Co or Mn.

2 . The mesoporous gold deposited oxidation catalyst according to claim 1 , wherein the gold deposited on the catalyst is preferably in the range of 0.1-3 atomic wt % of gold.

3 . A process for the preparation of mesoporous gold deposited oxidation catalyst according to claim 1 , comprising the steps of:
a) adding M(NO 3 ) 2 .3H 2 O, Ce(NO 3 ) 3 .6H 2 O and ZrOCl 2 .8H 2 O into the ethanol solution of triblock co-polymer (P-123) with stirring for period in the range of 30 min to 2 h to obtain transparent coloured sol; b) aging the transparent coloured sol for period in the range of 46 to 48 hr at temperature in the range of 40 to 45° C.; c) drying the aged sol as obtained in step (b) at temperature in the range of 90 to 110° C. for period in the range of 20 to 24 h followed by calcining at temperature in the range of 350 to 400° C. for period in the range of 2 to 4 h with the ramping rate of 1° C./min to get the M 0.1 Ce 0.85 Zr 0.05 O 2 mesoporous mixed oxide; d) adding water containing HAuCl 4 .3H 2 O solution into methanolic solution of M 0.1 Ce 0.85 Zr 0.05 O 2 mesoporous mixed oxide as obtained in step (d); e) irradiating the reaction mixture of step (e) under UV light for period in the range of 30 min. to 2 hrs and the solution is allowed to settle down and then decanted; f) centrifuging the remaining solution of step (f) with water and ethanol at speed in the range of 4000 to 6000 rpm for period in the range of 8 to 10 min followed by drying to obtain mesoporous gold deposited oxidation catalyst.

4 . The process as claimed in claim 3 , wherein drying in step (c) is carried out at temperature in the range of 90 to 110° C. for period in the range of 20 to 24 hr.

5 . The process as claimed in claim 3 , wherein drying in step (f) is carried out at temperature in the range of 40 to 45° C. for period in the range of 8 to 16 h and at temperature in the range of 80 to 100° C. for period in the range of 8 to 12 h.

6 . The mesoporous gold deposited oxidation catalyst according to claim 1 , wherein said catalyst is useful for oxidation of CO.

7 . The mesoporous gold deposited oxidation catalyst according to claim 6 , wherein said catalyst exhibit CO conversion efficiency in the range of 50 to 100% between 35 and 69 deg C.

Assignees

• Council Scient Ind Res

Inventors

• Gopinath Chinnakonda Subramanian
• Gnanakumar Edwin Solomon Raja

Classifications

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title

• B01J23/63

  with rare earths or actinides · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title