Effect of the Flow Rate of H2 in the Reduction Process on the Physical and Catalytic Properties of H2-Reduced Pt/MoO3.
Effect of the Flow Rate of H2 in the Reduction Process on the Physical and Catalytic Properties of H2-Reduced Pt/MoO3.
复制标题
还原过程中氢气流量对氢气还原 Pt/MoO3 物理和催化性能的影响。
DOI：
10.1246/bcsj.75.1165
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发表时间：
2002
影响因子：
4
通讯作者：
N. Takahashi
中科院分区：
文献类型：
--
作者：
T. Matsuda;Aya Hanai;Fumiko Uchijima;H. Sakagami;N. Takahashi
在773K还原过程中，随着H2流量的增加，还原铂/MoO_3的比表面积减小，而在523和623K时，则呈现相反的趋势。当还原程度为%时，比表面积最大，约为300m2g-1。H_2和H_2O混合还原的研究表明，在H_2O存在的情况下，还原程度降低。从这些结果我们认为，铂/MoO_3的还原被还原产生的H2O的作用所抑制。H_2还原的Pt/MoO_3的戊烷异构化活性也与还原程度有关。在还原程度为76%时，异构化活性最高。H_2还原的Pt/MoO_3对正戊烷异构化反应具有相当的催化活性。
The surface area of H2-reduced Pt/MoO3 decreased with increasing the flow rate of H2 in the reduction process at 773 K, while the opposite tendency was observed at 523 and 623 K. The surface area was found to depend on the extent of reduction, which was raised by an increase in the H2 flow rate. The largest surface area, about 300 m2 g-1, was obtained at a reduction degree of 64%. A study of reduction with a mixture of H2 and H2O showed that the extent of reduction declined in the presence of H2O. We suggest from these results that the reduction of Pt/MoO3 was prohibited by the action of H2O produced by the reduction. The pentane isomerization activity of H2-reduced Pt/MoO3 was also dependent on the extent of reduction. The highest isomerization activity was obtained at a reduction degree of 76%. H2-reduced Pt/MoO3 exhibited a comparable catalytic activity for pentane isomerization to Pt/H-mordenite.