Non noble metal based diesel oxidation catalyst
AssigneeCouncil of Scientific and Industrial Research
InventorsShubhangi B. Umbarkar, Mohan K. Dongare, Pavan M. More, Ankush V. Biradar
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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.
Claims7
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 oxide of A in the range of 1-23.314% by weight of the catalyst and oxide of B in the range of 76.686-99% by weight of the catalyst, wherein the catalyst is devoid of noble-metal, and the BET surface area of the catalyst is 150-160 m2/g with a pore volume of about 0.381 cm3/g;
- 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;
- d) 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.
A method for using a diesel oxidation in oxidation of propene and carbon monoxide or mixture thereof from diesel engine exhaust, said method comprising the steps of:
- i) heating said catalyst at 500° C. for 1 hr in flow of 10% O2 in He followed by cooling to a temperature range of 25° C. to 50° C.;
- and
- ii) passing a mixture of carbon monoxide, oxygen and helium gas or a mixture of propene, oxygen and helium gas of said catalyst,
- wherein gas hourly space velocity of the mixture of gases is in the range of 20,000 h−1 to 100,000 h−1;
- wherein the catalyst comprises 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 oxide of A in the range of 1-60% by weight of the catalyst and oxide of B in the range of 40-99% by weight of the catalyst, wherein the catalyst is devoid of noble-metal, and the BET surface area of the catalyst is 150-160 m2/g with a pore volume of about 0.381 cm3/g.
Dependencies are inferred from the claim text.