CO oxidation over Pd and Cu catalysts. 1. Unreduced PdCl sub 2 and CuCl sub 2 dispersed on alumina or carbon

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90179-8· OSTI ID:5608661

Choi, K I; Vannice, M A ^[1]

---

1. Pennsylvania State Univ., University Park (USA)

CO can be oxidized at 300-400 K by molecular oxygen over dispersed, unreduced PdCl{sub 2} or CuCl{sub 2} although rates were much lower than those obtained using both compounds together. PdCl{sub 2} was much more active than CuCl{sub 2}, and the addition of water vapor to the feed greatly enhanced the activity of the PdCl{sub 2} catalysts but not the CuCl{sub 2} catalysts. This system had not been previously characterized by IR spectroscopy, so this technique was employed to determine the Pd and Cu carbonyl and chloro-carbonyl species formed upon the introduction first of CO then, sequentially, of H{sub 2}O and O{sub 2} to establish reaction conditions. The in situ spectra identified PdCl{sub 2}CO, (PdClCO){sub n}, and CuClCO species as well as a small amount of terminal and bridged CO adsorbed on metallic Pd particles. Based upon the IR results, a thorough kinetic study, and prior aqueous-phase studies in the literature, a reaction model is proposed that involves water as a reactant with the PdClCO species when water vapor is present. In its absence, molecular oxygen appears to interact with PdClCO to produce CO{sub 2}.

• OSTI ID: 5608661
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 127:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330702 -- Emission Control-- Carbon Monoxide
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COPPER CHLORIDES
COPPER COMPOUNDS
COPPER HALIDES
ELEMENTS
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HALIDES
HALOGEN COMPOUNDS
INDUSTRIAL PLANTS
INFRARED SPECTRA
KINETICS
MATHEMATICAL MODELS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM CHLORIDES
PALLADIUM COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VAPORS
WASTES
WATER VAPOR