In this study, deactivation of supported Ni, Co and Pd catalysts in CO hydrogenation by carbon formation was investigated. Coke weight was measured continuously by gravimetric balance and the reaction products were analyzed by Gas Chromatograph.
From the experiments, we concluded as follows; Carbon deposition increases and the conversion slowly deactivates with higher metal loading of the catalysts. Carbon deposition on Pd catalyst is lower than that on Ni and Co. Deactivation by carbidic carbon is more rapid than by graphtic carbon. Removal of graphitic by $H_2$ regeneration is more difficult than that of carbidic carbon.
The amounts of carbon deposition decrease in the following sequence according to the supports; $Ni/TiO_2＞Ni/SiO_2-Al_2O_3＞Ni/SiO_2$ and $Co/SiO_2＞Co/TiO_2＞Co/SiO_2$.
