The forms of adsorption sites, dynamic behavior of chemisorbed CO and CO disproportionation have been investigated by using CO and NO as double probes and TP-IR dynamic method. The results indicate that there are a large amount of adsorption sites for gem-dicarbonyl CO and a very small amount of adsorption sites for linear CO on Rh, and CO sites for adsorbed NO over Rh+Co/Al2O3. The bands of gem-dicarbonyl CO gradually decreased in intensity and fully desorbed at 300℃ during TPD (in vacuum) dynamic process. The temperature fully desorbed for gem-dicarbonyl CO on Rh+Co/Al2O3 is lower than that for gem-dicarbonyl CO on Rh4/Al2O3 indicating that addition of Co weaken CO adsorption strength on Rh^I sites over Rh+Co/Al2O3. The results obtained from TP (in CO) dynamic process indicate that CO disproportionation take place above 250℃ and the rate of CO disproportionation on Rh^I sites is higher than that on linear sites CO over Rh+Co/Al2O3.

Key words: COBALT, METAL CATALYST, ALUMINIUM OXIDE, CARBON MONOXIDE, ADSORPTION, RHODIUM, NITROGEN MONOXIDE