Abstract
The reactivities of chemisorbed CO with gaseous O 2, NO, and H 2 over 1 wt% Rh SiO 2 have been investigated using infrared spectroscopy and temperature-programmed desorption methods. Three types of CO chemisorbed species Rh(CO) 2 ( I), Rh(CO) ( II), and Rh 2(CO) ( III), were found on the silica-supported rhodium catalyst at room temperature. The reactivity of these species with O 2 or H 2 is in the order of I > II ⪢ III. Chemisorbed CO cannot react with gaseous NO, but species II and III can exchange with NO forming chemisorbed species Rh(NO) and RhO 2(NO) at the cluster Rh x sites.
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