Property of Pd-supported catalysts for catalytic combustion

✍ Scribed by Koshi Sekizawa; Koichi Eguchi; Hardiyanto Widjaja; Masato Machida; Hiromichi Arai

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 571 KB
• Volume: 28
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00241-3

✦ Synopsis

The catalytic properties of Pd/Sr,,,La,,XAl 1 ,0,9 (X = Al and Mn) and Pd/AI,O,-MO, (M = Co, Cr, Cu, Fe, Mn and Ni) catalysts were investigated for use in catalytic combustion. The activity of Pd/Sr,,,La o,2 Al 120,9 initially increased with rise in temperature, but decreased at high temperatures (ca. 700°C). The drop in catalytic activity was steep when the supported Pd particles were sintered after calcination above 1000°C. The activity drop accompanied dissociation of PdO into metallic Pd. Such significant drop in catalytic activity can be avoided by the use of Mn-substituted hexaaluminate (X = Mn) as a catalyst support, due to its activity for combustion. The drop could be also avoided by use of Pd/Al,O,-NiO catalysts calcined at low temperatures. Although the surface area decreased with increasing NiO content, the catalytic activity increased. Pd particle size is an important factor in determining catalytic activity.