Hydrogen Adsorption on the System Cu—V2O3

Planning & Development Division, Fertilizer Corporation of India Ltd.,Sindri, Danbad (Bihar)

Department of Chemistry, B.H.U., Varanasi-5 (U.P.)

Manuscript received 24 April 1978, revised 29 January 1979, accepted 27 April 1979

Hydrogen adsorption has been studied in a volumetric adsorption unit at 98°—250° on the system Cu —V₂O₃, prepared in situ by the reduction of Cu₃ (VO₄)₂.3H₂O at 130°. Isotherms are of the Temkin type and isobars, constructed therefrom, show an activated adsorption, 175° being the temperature at which maximum coverage is possible (about 67% under an equilibrium pressure of 8.0 cm Hg.).

The kinetic data obtained by constant volume method at 102°—290° under different ambient pressures obey the Elovich equation showing break around Ɵ=0.09, the break appearing at higher temperatures and higher initial pressures.
The nature of hydrogen adsorption has been correlated with the phase transition of V₂O₃, occurring at 175°-225º.