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

Journal Article · Wed Apr 01 00:00:00 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), Vol. 134:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

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