Removal of oxygenates in aqueous phase product of Fischer-Tropsch (F-T) process was studied by the catalytic hydrogenation over supported Ru catalysts. The catalytic performance of several Ru catalysts supported on different metal oxides such as ZrO2

TiO2

SiO2 and γ-Al2O3 was investigated. In the catalytic hydrogenation processes

aldehydes

ketones and esters are more readily to be transformed than carboxylic acid and alcohol. The Ru/ZrO2 and Ru/TiO2 catalysts exhibited excellent hydrogenation activity

and under the conditions of 200℃

9.8 MPa pressure and 3.0 h-1 WHSV

the carboxylic acids

aldehydes

alcohols

ketones and esters all are transformed to C1—C6 alkanes with overall conversion of above 92%. However

the Ru/Al2O3 catalyst displays the lowest activity towards alcohols with below 30% of conversion at the same conditions

although other oxygenates

including carboxylic acids

aldehydes

ketones and esters

are transformed with considerable conversion of above 87%

indicating that the Ru/Al2O3 catalyst was of selectivity for the conversion of oxygenates and the most of alcohols can not be transformed. The results from H2-TPR and NH3-TPD reveal that the synergy between metal and alumina is conductive to the hydrogenation of carboxylic acids and inhibits the hydrogenation-decarbonylation of alcohols. On the contrary

the catalysts with weak metal-support interaction and low acidity improve the hydrogenation activity for carboxylic acids and alcohols. However

there was a good stability of 400 h for Ru/Al2O3 catalyst

although the degeneration of catalytic activity was also observed after running 400 h. The results from X-ray diffraction (XRD)

scanning electron microscopy (SEM) and N2 physisorption show that the change of textural and structural properties is the key factors for activity degeneration of Ru/Al2O3 catalyst

because of the transformation of γ-alumina to boehmite and of the great decrease of surface area from 197 m2·g-1 to 21 m2·g-1 and loss of porosity.