Novel catalytic phenomena and mechanisms for formic acid decomposition on TiO2(110) and NO reduction on Co2/Al2O3(110)

COLL 452

Yasuhiro Iwasawa,, Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
The paper presents new phenomenon and understanding of acid-base catalysis, unlike the conventional acid-base concept, for catalytic formic acid decomposition on TiO2(110) and a novel mechanism, different from the Langmuir-Hinshelwood and Eley-Rideal mechanisms, for catalytic NO-CO reaction on Co2/Al2O3(110). A key issue of developing catalytic technologies is to understand site-specific surface dynamic processes of adsorbed molecules and reaction intermediates in an atomic scale to find atom-resolved structure-activity relationship. The decisive role of oxygen defects in formic acid dehydration and the mechanism of switchover of the reaction paths from the dehydration to the dehydrogenation on a TiO2(110) surface are elucidated by STM observations and DFT calculations. A new reaction mechanism different from the LH and ER mechanisms for NO reduction on a Co2/Al2O3(110) surface with gas phase CO molecules is presented on the basis of FT-IR and DFT.