Isotopic exchange between hydrogen and water over plain and hydrophobized nickel-chromia catalysts

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90330-K· OSTI ID:7016835

Bhattacharya, K; Marwah, U R; Sood, D D ^[1]

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1. Bhabha Atomic Research Centre, Bombay (India)

Isotope exchange between hydrogen and deuterated water has been studied in gas phase as well as in liquid phase using nickel-chromia catalyst. The optimum chromia content in the oxide was found to be 15 mole%. Hydrophobized catalyst could be prepared by hydrogen reduction of nickel oxide-chromium oxide powder treated with phenyl trimethoxy silane. The hydrophobic layer did not alter the gas phase kinetics and was observed to promote H-D exchange between hydrogen and liquid deuterated water. Counter-current exchange studies carried out up to 90 days have demonstrated the stability of the catalyst and capability for repeated use. The hydrophobic layer was stable in water pressurized up to 10[sup 6] Pa and at temperatures up to 373 K. On the basis of gas phase kinetic studies an activation energy of 16.0 [plus minus] 1.8 kJ/mole has been observed for hydrophobized catalyst.

• OSTI ID: 7016835
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 134:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
070101 -- Heavy Water Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
ACTIVATION ENERGY
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
DEUTERIUM
ELEMENTS
ENERGY
FLUIDS
GASES
HEAVY WATER
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
LIQUIDS
METALS
NICKEL
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER