Kinetics and reaction chemistry of catalytic hydrodechlorination of chlorinated benzenes on sulfided NiMo/. gamma. Al sub 2
Catalytic hydroprocessing has recently emerged as a treatment and recycling process for waste streams containing chlorinated organics. Compounds such as polychlorinated biphenyls (PCBs), and pentachlorophenol (PCP) can be effectively treated using this chemistry. These applications have created a need for rate and mechanism data for these reactions. In this work, the catalytic hydrodechlorination reactions of hexachlorobenzene and all of its partially dechlorinated intermediates over NiMo/{gamma}Al{sub 2}O{sub 3} hydroprocessing catalyst were examined in a differential microflow reactor. The NiMo catalyst was chosen after a screening study revealed that it had high activity and selectivity for dechlorination. Based on chlorobenzene hydrodechlorination data at 275-375C, a kinetic model was proposed where the rates of adsorption and surface reaction were comparable and neither controlled the overall reaction rate. The dechlorination rate data of hexachlorobenzene and other chlorinated benzenes point toward the presence of steps that involve multiple chlorine removal. Not all possible intermediates are formed; all of the observed intermediate dechlorination steps proceed at comparable rates.
- Research Organization:
- California Univ., Los Angeles, CA (United States)
- OSTI ID:
- 5606969
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
AROMATICS
CATALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORINATED AROMATIC HYDROCARBONS
DECHLORINATION
DEHALOGENATION
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
KINETICS
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
MATHEMATICAL MODELS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
PROCESSING
REACTION KINETICS
RECOVERY
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER POLLUTION