P2.9.16 Deactivation mechanism of alumina supported Pt and Pd catalysts for gas sensor by hexamethyldisiloxane (HMDSO)

Maiko Nishibori, Kimiko Katoh, Toshio Itoh, Noriya Izu & Woosuck Shin
The deactivation mechanism of Pt/gamma-alumina and Pd/gamma-alumina catalysts for gas sensor by hexamethyldisiloxane (HMDSO) exposure has been investigated. The chemical state and local structure of Pd in the catalysts has been characterized under the reduction and oxidation after HMDSO exposure by in situ X-ray absorption fine structure (XAFS) measurement. The Pd/gamma-alumina catalyst after HMDSO exposure hardly changed the chemical state of Pd even under the O2/N2 atmosphere though it oxidized easily under the O2/N2 atmosphere...