Non noble metal based diesel oxidation catalyst

Patent metadata

Field	Value
Publication number	US-2016332118-A1
Application number	US-201515112986-A
Country	US
Kind code	A1
Filing date	Jan 21, 2015
Priority date	Jan 21, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

Disclosed is a cheap and efficient non noble metal based catalyst for the oxidation of diesel or hydrocarbons, its synthesis and its application for diesel oxidation at low temperature. The catalyst comprises a mixed oxide of manganese and cerium, or manganese, cerium and zirconium. The catalyst has improved water and sulphur tolerance.

First claim

We claim:

1 . A diesel oxidation catalyst comprising a mixed oxide of A and B, wherein A is Mn and B is Ce or a mixture of Ce and Zr, said catalyst comprises A in the range of 1-60% by weight of the catalyst and B in the range of 40-99% by weight of the catalyst, wherein the catalyst is devoid of noble-metal and is having Mn particle size of 50-70% particles <1 nm;
said catalyst is prepared by a process comprising: a) mixing salt of A and salt of B in water or a mixture of water and an acid to obtain a solution; b) adjusting pH of the solution obtained in step (a) in the range of 7-12; c) heat treating the solution of (b) to a temperature in the range of 100-200° C. for 15-120 minutes to obtain a reaction mixture; di) cooling and filtering the reaction mixture to obtain a residue; and e) washing and calcinating the residue obtained in step (d) at a temperature in the range of 300-800° C. for 1-5 hours to obtain the diesel oxidation catalyst.

2 . The catalyst according to claim 1 , wherein the BET surface area of the catalysts is 100-160 m 2 /g with a pore volume of 0.200 to 0.381 cm 3 /g.

3 . The catalyst according to claim 1 , wherein the salt of A and B is selected from the group consisting of nitrate, acetate.

4 . The catalyst according to claim 1 , wherein the acid used is nitric acid.

5 . The catalyst according to claim 1 is useful in oxidation of hydrocarbons and carbon monoxide from diesel engine exhaust.

6 . The catalyst according to claim 1 , wherein the catalyst oxidizes carbon monoxide (50% conversion) at a temperature in the range of 30 to 250° C.

7 . The catalyst according to claim 1 , wherein the catalyst exhibits sulphur tolerance with oxidation of carbon monooxide (50% conversion) at a temperature in the range of 200 to 300° C.

8 . The catalyst according to claim 1 , wherein the catalyst exhibits water tolerance with oxidation of carbon monooxide (50% conversion) at a temperature in the range of 220 to 300° C.

Assignees

• Council Scient Ind Res

Inventors

• Umbarkar Shubhangi B
• Dongare Mohan K
• More Pavan M
• Biradar Ankush V

Classifications

• B01D53/944

  Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445) · CPC title

• B01D53/9495

  Controlling the catalytic process · CPC title

• B01D2258/012

  Diesel engines and lean burn gasoline engines · CPC title

• B01D2255/9207

  Specific surface · CPC title

• B01D2255/9205

  Porosity · CPC title