Kinetics of the Formation of MoO<SUB>3−<I>x</I></SUB> at Elevated Temperatures from a Mixture of MoO<SUB>3</SUB> and α-Al<SUB>2</SUB>O<SUB>3</SUB>
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概要
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The kinetics of the formation of MoO<SUB>3−<I>x</I></SUB> from a mixture of MoO<SUB>3</SUB> and α-Al<SUB>2</SUB>O<SUB>3</SUB> was studied by means of high temperature X-ray diffraction. The species of MoO<SUB>3−<I>x</I></SUB> formed in the temperature range 600–700 °C were identified as MoO<SUB>2.88</SUB>(Mo<SUB>8</SUB>O<SUB>23</SUB>),(MoO<SUB>2.76</SUB>(MoO<SUB>17</SUB>O<SUB>47</SUB>), and MoO<SUB>2.75</SUB>(Mo<SUB>4</SUB>O<SUB>11</SUB>). The activation energies of their formation were estimated to be 18.4 kcal/mol for Mo<SUB>8</SUB>O<SUB>23</SUB>, 23.0 kcal/mol for Mo<SUB>17</SUB>O<SUB>47</SUB> and 29.2 kcal/mol for Mo<SUB>4</SUB>O<SUB>11</SUB>. Other types of species of MoO<SUB>3−<I>x</I></SUB> observed above 800 °C were MoO<SUB>2.89</SUB>(Mo<SUB>9</SUB>O<SUB>26</SUB>) and MoO<SUB>2</SUB>. Little effect of water vapor, oxygen or nitrogen on the formation of the species was observed. No MoO<SUB>3−<I>x</I></SUB>. was observed in the mixture of MoO<SUB>3</SUB>, with SiO<SUB>2</SUB> or α-Fe<SUB>2</SUB>O<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Ueno Akifumi
National Chemical Laboratory for Industry
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Kotera Yoshihide
National Chemical Laboratory for Industry
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