SEARCH Articles Figures Tables Catalyst palladium-barium sulfate Hydrogen palladium Hydrogen sulfate Palladium barium sulfate Palladium catalysts catalyst Palladium hydrogenation Palladium hydrogenation catalyst Palladium quinoline Quinoline catalyst Quinoline, hydrogenation Quinolines hydrogenation Sulfate catalysts Sulfate hydrogenation catalysts Sulfates barium sulfate