CORRELATION BETWEEN ACTIVITY AND OXYGEN STORAGE CAPACITY OF CERIA ON Pd-ONLY THREE-WAY CATALYSTS

Shin BS; Bae JH; Yoo JP; Choung SJ; Song YI; Yeo GK

Korean Journal of Chemical Engineering, Vol.15, No.5, 474-479, September, 1998

Shin BS, Bae JH, Yoo JP, Choung SJ, Song YI, Yeo GK

One way of enhancing the thermal stability and NO_x, THC and CO conversion of a catalyst is to improve the thermal stability and oxygen storage capacity (OSC) of the ceria. The appropriate mixing ratios of bulk and stabilized ceria are especially very important for designing Pd-only three-way catalysts. In this paper, we discuss the surface phenomena of stabilized and unstabilized (bulk) ceria, the OSC of catalysts, and the correlation between activity and OSC of Pd-only catalysts with mixing ratios of bulk ceria and stabilized ceria.

Keywords:Thermal Stability;Oxygen Storage Capacity;Ceria;Stabilized Ceria;Pd-Only Catalyst;Three-Way Performance;Light-Off Performance

[References]

Belton DN, Schmieg SJ, Permana H, Hori CE, Simon KY, Brenmer A, "How and Why Incorporating ZrO2 into Automotive Catalysts Improves Their Catalytic Activity," 15th NAM Poster Abstract, p. 231 (1997)
Brisley RJ, Chandler GR, Jones HR, Ander PJ, Shady PJ, "The Use of Palladium in Advanced Catalysts," SAE950259
Diwell AF, Rajaram RR, Shaw HA, Truex TJ, "The Role of Ceria in Three-Way Catalysts," Catalysis and Automotive Pollution Control II, 139 (1991)
Kubish JE, Rieck JS, Spencer ND, "Cerium Oxide Stabilization: Physical Property and Three-way Activity Considerations," Catalysis and Automotive Pollution Control II, 125 (1991)
Muraki H, "Performance of Palladium Automotive Catalysts," SAE910842
Summers JC, Williamson WB, Henk MG, "Uses of Palladium in Automotive Emission Control Catalysts," SAE880281
Yoon KJ, Kang HK, Yie JE, Korean J. Chem. Eng., 14(5), 399 (1997)

[Referenced By]

[1] Belton DN, Schmieg SJ, Permana H, Hori CE, Simon KY, Brenmer A, "How and Why Incorporating ZrO2 into Automotive Catalysts Improves Their Catalytic Activity," 15th NAM Poster Abstract, p. 231 (1997)

[2] Brisley RJ, Chandler GR, Jones HR, Ander PJ, Shady PJ, "The Use of Palladium in Advanced Catalysts," SAE950259

[3] Diwell AF, Rajaram RR, Shaw HA, Truex TJ, "The Role of Ceria in Three-Way Catalysts," Catalysis and Automotive Pollution Control II, 139 (1991)

[4] Kubish JE, Rieck JS, Spencer ND, "Cerium Oxide Stabilization: Physical Property and Three-way Activity Considerations," Catalysis and Automotive Pollution Control II, 125 (1991)

[5] Muraki H, "Performance of Palladium Automotive Catalysts," SAE910842

[6] Summers JC, Williamson WB, Henk MG, "Uses of Palladium in Automotive Emission Control Catalysts," SAE880281

[7] Yoon KJ, Kang HK, Yie JE, Korean J. Chem. Eng., 14(5), 399 (1997)