期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 105, 期 38, 页码 9153-9156出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp011622p
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The topotactic mechanism for the reduction of MoO3 to MoO2 has been well-supported by experiments, though the detection of Mo4O11 during the process has been a challenge to the notion of direct conversion. In this study, high quality in-situ Neutron Powder Diffraction (NPD) has been used to monitor phase composition during the reduction Of MoO3 in a flow of hydrogen at 550 degreesC. Three phases have been detected: MoO3, MoO2, and Mo4O11. Multiphase Rietveld refinement has been used to obtain concentration profiles for all three oxides throughout the reduction process. Examination of these profiles reveals the following: (1) a higher content, initially, of MoO2 than Mo4O11; (2) a period of constant MoO2 content; (3) an induction period of Mo4O11 formation; and (4) a resumption in growth of MoO2 but with different unit cell dimensions.
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