Bulletin of the Chemical Society of Japan · 1961 · 29 citations · 5 references
Natural SciencesChemical EngineeringChemistryCatalysisInorganic ChemistryPhysical ChemistryCatalyst CharacterizationCatalyst PreparationCatalyst StabilityCatalyst SynthesisCatalytic MaterialsCatalytic MechanismsCatalyst ActivationCatalyst Performance PreservationMetal Oxide Catalyst SynthesisNitro CompoundsPlatinum CompoundsSteric Constraints
Abstract 1. A silk-platinum chelate, which had the highest platinum content, involving both the total platinum content and the coordinated platinum, was obtained when 400 mg. of silk-fibroin was boiled with 20 ml. of a 0.75% aqueous solution of potassium tetrachloroplatinate for 14 to 20 min. 2. The most active silk-platinum catalyst was obtained when reduction of the chelate was pepeated twice in 1% acetic acid with 90 kg./cm2 of hydrogen at 160°C. The activity was much influenced by the solvent, temperature and time used for its activation. 3. The catalyst could be stored for a long period in the dry state and even showed some increase in activity during storage. 4. The most active catalyst had about two hundred and fifty times as much activity as that of a platinic oxide catalyst in the hydro-genation of nitrobenzene to aniline. 5. The characteristic structure of the carrier seems to exert some steric hindrance on the hydrogenation of highly branched aromatic nitro compounds.
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