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OALib Journal期刊
ISSN: 2333-9721
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MoO_3-MoO_2-H_2O-H_2系平衡及400—700℃Mo-O系相图
, PP. 54-59
Keywords: MoO_3,Magneli相,热重,平衡,相图
Abstract:
使用自行设计的受控气氛热重装置研究了MoO_3—MoO_2-H_2O—H_2系平衡.在P_(H_2O)/P_(H_2)从0.412至0.609,温度从400至534℃范围内直接测定了反应MoO_3+H_2=MoO_2+H_2O(g)的平衡常数与温度间的关系为1gK_p=0.702-739.8/T获得298.15K下MoO_3标准生成焓及绝对熵分别为-845.75kJmole~(-1)及78.1J·K~(-1)mole~(-1)实验表明,存在于MoO_2-MoO_3系中的一些Magneli相在本研究条件下不能作为热力学稳定相而存在.并绘制了400-700℃下Mo-O系相图.
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