Possibility of electrochemical regeneration of palladium catalysts poisoned by arsenic
The authors examined the possibility of using electrochemical methods for regenerating As-poisoned palladium catalysts in sulfuric acid and alkali solutions. It was shown that arsenic adsorbed on electrochemically deposited palladium suppresses its adsorption capacity for hydrogen and its catalytic activity in electrochemical reduction of nitromethane. Anodic and cyclic anodic-cathodic polarization of poisoned Pd in H/sub 2/SO/sub 4/ and KOH solutions results in oxidation of arsenic. The influence of the composition of the electrolyte on regeneration of palladium poisoned by arsenic was determined. Regeneration of arsenic-poisoned catalysts deposited on conducting supports can be achieved by anodic polarization of the electrodes in 1 N KOH at E/sub r/ greater than or equal to 1.00 V.
- Research Organization:
- M. V. Lomonosov Moscow State Univ. (USSR)
- OSTI ID:
- 6161276
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 61:5; ISSN JAPUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METAL COMPOUNDS
ARSENIC
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL EXPLOSIVES
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
DEACTIVATION
EFFICIENCY
ELECTROCATALYSTS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
EXPLOSIVES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
METALS
NITRO COMPOUNDS
NITROMETHANE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
REDUCTION
REGENERATION
SEMIMETALS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SULFURIC ACID
SURFACE PROPERTIES
TRANSITION ELEMENTS