Mechanism and Kinetic Study of Reducing MoO to MoO with CO-15 vol % CO Mixed Gases.

In the present paper, the reduction reaction of high-purity MoO with CO-15 vol % CO mixed gases in the temperature range of 901-948 K is investigated via the thermogravimetric analysis technology. The results show that reduction of MoO to MoO follows a three-step reaction process, viz., MoO is first reduced into MoO, followed by MoO, and finally to MoO. The reaction sequences of MoO → MoO → MoO → MoO are proposed, which are quite different from those observed on reduction of MoO by pure H or CO gases. Pure MoO and MoO could be synthesized once suitable time was controlled. Rate-controlling steps for the reduction from MoO to MoO and MoO to MoO (include both MoO to MoO and MoO to MoO) are interfacial chemical reactions, with the activation energies of 318.326 and 112.047 kJ/mol, respectively. This study also discovers that the as-synthesized MoO keeps the same platelet-shaped and smooth morphology as the MoO raw material; however, its particles size gradually increased as the reaction proceeds due to the formation of low-melting-point eutectic and the sticking of different particles.