3371.     TERMINASOV, Y. S., AND BELETSKIĬ, M. S.  [X-Ray Investigations of the Structure of the Nickel Skeleton Catalyst.]  Doklady Akad. Nauk S.S.S.R., vol. y63, 1948, pp. 411-413; Chem. Abs., vol. 44, 1950, p. 9784.

        Catalyst obtained after leaching out the Ni₂Al₃ with alkali and subsequent self ignition of the Ni residue consists of a mixture of cubic Ni (lattice constant a=3.52 Å.) and NiO (a=4.15 Å.).  If, after leaching, the catalyst is stored under H₂O to prevent oxidation, X-ray patterns reveal hexagonal Ni, with a=2.56, c=4.16 Å.  These lattice constants are distinctly lower than those of the hexagonal Ni of Bredig and Allolio (abs. 337), evidently as a result of occlusion of H₂ in leaching. The grain size of the hexagonal Ni in the skeleton catalyst is of the order of 10^-5-10^-6 cm.  Self ignition and the accompanying heating-up evidently result in a conversion of the hexagonal Ni into cubic Ni.

        TER-NEDDEN, W.  See abs. 1047.