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Abstract-Ceria is the active catalyst for various chemical processes. The reactions of hydrogenation of carbon monoxide and dehydration of bioethanol using the cerium oxide as catalyst are considered. The role of cerium oxide in the investigated processes, which have a positive influence on the selectivity, the process conditions, the dispersion of catalysts are shown. Cerium oxide improves the dispersion of active component and has the own catalytic activity.Index Terms-Ceria, catalyst, dehydration of ethanol, conversion of bio-ethanol.