DEVELOPMENT OF BASE METAL OXIDE CATALYST FOR AUTOMOTIVE EMISSION CONTROL

Gallardo S; Aida T; Niiyama H

Korean Journal of Chemical Engineering, Vol.15, No.5, 480-485, September, 1998

Activity of alumina was tested for CO and hydrocarbon oxidation using the flow reactor system. The mechanism of the CO oxidation was elucidated by isotopic tracer technique using a closed circulation system. CO oxidation was found to proceed via the formation of a carbonate type of intermediate species. Water enhances the CO oxidation and CO₂ retards alumina activity. Carbon deposition was also investigated during CO oxidation on alumina. Carbon formed was found to act as an in-situ active site that promoted CO oxidation. Results obtained showed alumina to be promising for CO oxidation. Pb showed opposite effects on CO and hydrocarbon reactions. Hydrocarbon reactivity test conducted showed that methanol is the most reactive on alumina giving 100% conversion at 500℃. However, carbon deposited affected the formation of several products at this temperature. Further study on methanol oxidation using alkaline treated alumina showed better performance for auto emission control. CeO₂, known to have an oxygen storage capacity, was tested as an additive to alumina for methanol oxidation and propylene oxidation. Results proved that CeO₂-Al₂O₃ gave much higher activity for CO oxidation, methanol oxidation, and propylene oxidation than alumina.

Keywords:CO Oxidation;Hydrocarbon Oxidation;Auto Emission Catalyst;Alumina;Ceria;Carbon Deposition

[References]

Andersen and Boudart, "CATALYSIS, Science & Technology," Springer Verlag, Vol. 5 (1984)
Engineering Science Inc & Basic Technology & Management Corporation, "Final Report for Vehicular Emission Control Planning in Metro Manila," EMB(DENR) Report (1992)
Gallardo S, "Air Pollution Study in Metro Manila," DLSU Engineering Journal, IX, 24 (1993)
Gallardo S, Niiyama H, "Catalysis & Air Pollution in Metro Manila," Proceedings of the Regional Symposium on Chemical Engineering, Manila, ET-10 (1994)
Gallardo S, Aida T, Niiyama H, "Kinetics & Mechanism of CO Oxidation on Alumina: Effect of CO2 and Pore Size," Proceedings of the Regional Symposium on Chem. Engg., Bangkok, 1-28 (1995)
Gallardo S, Aida T, Niiyama H, "Alumina: An Oxidation Catalyst for Auto Emission Control," Proceedings of the 4th ASEAN Science & Technology Week, Bangkok, 136 (1995)
Gallardo S, Aida T, Niiyama H, "A Study on the Carbon Deposition on Alumina During Carbon Monoxide Oxidation with Oxygen," Proceedings of the Regional Symposium on Chem. Engg., Jakarta, 3-9 (1996)
Gallardo S, Niiyama H, "Kinetic Study using Differential Reactor Approximation: CO Oxidation with Oxygen on Alumina," DLSU Engineering Journal, Vol. XI, 57 (1997)
Gallardo S, Aida T, Niiyama H, "Methanol Oxidation on Alumina," Paper Submitted to the Regional Symposium on Chem. Engg., Johor, Malaysia, October (1997)
Hamada, Appl. Catal., 70, L15 (1991)
Williamson WB, Summers JC, Scaparo JA, ACS Symp. Ser., 495, 26 (1992)

[Referenced By]

[1] Andersen and Boudart, "CATALYSIS, Science & Technology," Springer Verlag, Vol. 5 (1984)

[2] Engineering Science Inc & Basic Technology & Management Corporation, "Final Report for Vehicular Emission Control Planning in Metro Manila," EMB(DENR) Report (1992)

[3] Gallardo S, "Air Pollution Study in Metro Manila," DLSU Engineering Journal, IX, 24 (1993)

[4] Gallardo S, Niiyama H, "Catalysis & Air Pollution in Metro Manila," Proceedings of the Regional Symposium on Chemical Engineering, Manila, ET-10 (1994)

[5] Gallardo S, Aida T, Niiyama H, "Kinetics & Mechanism of CO Oxidation on Alumina: Effect of CO2 and Pore Size," Proceedings of the Regional Symposium on Chem. Engg., Bangkok, 1-28 (1995)

[6] Gallardo S, Aida T, Niiyama H, "Alumina: An Oxidation Catalyst for Auto Emission Control," Proceedings of the 4th ASEAN Science & Technology Week, Bangkok, 136 (1995)

[7] Gallardo S, Aida T, Niiyama H, "A Study on the Carbon Deposition on Alumina During Carbon Monoxide Oxidation with Oxygen," Proceedings of the Regional Symposium on Chem. Engg., Jakarta, 3-9 (1996)

[8] Gallardo S, Niiyama H, "Kinetic Study using Differential Reactor Approximation: CO Oxidation with Oxygen on Alumina," DLSU Engineering Journal, Vol. XI, 57 (1997)

[9] Gallardo S, Aida T, Niiyama H, "Methanol Oxidation on Alumina," Paper Submitted to the Regional Symposium on Chem. Engg., Johor, Malaysia, October (1997)

[10] Hamada, Appl. Catal., 70, L15 (1991)

[11] Williamson WB, Summers JC, Scaparo JA, ACS Symp. Ser., 495, 26 (1992)