A　series　of　alumina　supported　ruthenium　catalysts,　which　prepared　by　hydrogen　treatment　or　hydrazine　reduction,　were　characterized　by　N2　adsorption,　X-ray　diffraction　(XRD),　X-ray　fluorescence　(XRF),　CO　chemisorption,　and　Temperature-programmed　desorption　of　hydrogen　(H2-TPD).　In　contrast　to　the　samples　with　conventional　hydrogen　reduction,　there　was　almost　no　residual　chlorine　in　the　samples　using　RuCl3　as　precursor　with　hydrazine　treatment.　Furthermore,　the　dissolved　aluminum　could　be　removed　much　more　easily　in　basic　solution,　which　led　to　the　higher　BET　surface　and　pore　volume　of　hydrazine-reduction　catalysts.　Therefore,　the　active　phase　(Ru　metal)　would　not　be　contaminated.　Three　main　peaks,　which　occurred　at　about　150,　375,　and　650　°C,　respectively,　were　observed　in　the　H2-TPD　profiles　of　Ru/Al2O3　catalysts　with　a　high　amount　of　residual　chlorine.　A　new　peak　of　desorption　hydrogen　centering　at　240　°C,　which　was　completely　suppressed　by　the　high　amount　of　residual　chlorine,　might　appear　in　the　profiles　of　the　samples　with　the　washing　procedure　following　hydrogen　reduction　or　hydrazine　treatment.　The　peaks　with　the　desorption　temperature　lower　than　500　°C　were　relative　with　dissociatively　adsorbed　hydrogen　and　spillover　hydrogen　simultaneity,　and　the　peak　at　above　500　°C　was　caused　by　spillover　hydrogen　and　would　be　stabilized　by　hydroxyl　groups　on　alumina　surface.　©　2008　Springer　Science+Business　Media,　LLC.