Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

The thermal decomposition of ammonium molybdate, nickel hydroxide and MoO₃-NiO 50 mole % mixture were studied by means of TG and DTG non-isothermally, in a dynamic atmosphere of N₂. The activation energy of the thermal process of such samples, also, were evaluated using Maple's theory, in isothermal condition. The variation of SBET with time, during heating ammonium molybdate, nickel hydroxide and MoO₃-NiO 50 mole % mixture at different temperatures, in the range 200 - 400 °C, was monitored, and the activation energy for the sintering process of each compound were calculated from the Arrhenius plot. The final products of heating each sample at the sintering temperatures after 6 h, were characterized by IR and XRD analyses. MoO₃ was formed clearly at 350 °C, while Ni forms a mixture of nickel(II) and -(III) oxides at the same temperature. NiMoO4 was produced, also, at 350 °C in MoO₃-NiO 50 mole % mixture sample.