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Synthesis of transition metal oxides with nanopores and their catalytic properties for alkane isomerization

纳米孔过渡金属氧化物的合成及其烷烃异构化催化性能

基本信息

批准号：
14550758
负责人：
MATSUDA Takeshi
金额：
$ 2.3万
依托单位：
Kitami Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The catalytic properties of H_2-reduced MoO_3 with noble metal for the conversions of pentane and propan-2-ol were studied. No appreciable difference appeared in the pentane isomerization activity and in the propan-2-ol dehydration activity among Pt, Pd, Rh, and Ir/MoO_3 catalysts after reduction at 773 K for 12 h. H_2-reduced Ru/MoO_3 exhibited the lower isomerization and dehydration activities than other catalysts. The isomerization and the dehydration activities of H2-reduced Ru/MoO_3 was improved by an increase in the amount of Ru loading, while those of H_2-reduced Pt/MoO_3 changed very little. XRD and TPR studies showed that the reduction process of Ru/MoO_3 varied with the amount of Ru. By contrast, reduction of Pt/MoO_3 involved the formation of hydrogen molybdenum bronze, H_xMoO_3, irrespective of the amount of Pt. We suggest from these results that reduction of H_xMoO_3 can yield the active phase for pentane isomerization and for propan-2-ol dehydration. In order to manifest the roles of H_xMoO_3, the effects of H_2 reduction on the physical and catalytic properties of one type of hydrogen molybdenum bronze, H_<1.55>MoO_3, were studied. H_2 reduction enlarged the surface areas of H_<1.55>MoO_3 and Pt/MoO_3, but not the surface area of MoO_3. H_<1.55>MoO_3 became an active catalyst for pentane isomerization and for propan-2-ol dehydration after H_2 reduction. The catalytic activities of H_2-reduced H_<1.55>MoO_3 were comparable to those of H_2-reduced Pt/MoO_3, and were much higher than those of H_2-reduced MoO_3. In reduction of H_<1.55>MoO_3 and Pt/MoO_3, molybdenum oxyhydride, MoO_xH_y, was formed after the decomposition of the hydrogen molybdenum bronze phase. By contrast, MoO_3 was reduced to MoO_2 without the formation of hydrogen bronze. We propose from these results that H_2 reduction of hydrogen molybdenum bronze will generate the MoO_xH_y phase that can act as the active phase for the conversions of pentane and propan-2-ol.

研究了含贵金属的H_2还原MoO_3对正戊烷和丙烷-2-醇转化反应的催化性能。在773K还原12h后，Pd、Pd、Rh和Ir/MoO_3催化剂的戊烷异构化活性和丙烷-2-醇脱水活性没有明显差异，H_2还原的Ru/MoO_3催化剂的异构化和脱水活性低于其他催化剂。随着Ru负载量的增加，H_2还原的Ru/MoO_3的异构化和脱水活性提高，而H_2还原的铂/MoO_3催化剂的异构化和脱水活性变化不大。X射线衍射和TPR研究表明，Ru/MoO_3的还原过程随Ru加入量的不同而不同。而铂/MoO_3的还原则形成了氢钼青铜H_xMoO_3，与铂含量无关。根据这些结果，我们认为H_xMoO_3的还原可以产生戊烷异构化和丙烷-2-醇脱水的活性相。为了揭示H_xMoO_3的作用，研究了H_2还原对氢钼青铜H_&lt；1.55&Gt；MoO_3物理性能和催化性能的影响。H_2还原使H_&lt；1.55&Gt；MoO_3和Pt/MoO_3的比表面积增大，但不增加MoO_3的比表面积。H_&lt；1.55&Gt；MoO_3在H_2还原后成为戊烷异构化和丙烷-2-醇脱水的活性催化剂。H&lt；1.55&Gt；MoO_3的催化活性与H_2还原的Pt/MoO_3相当，但远高于H_2还原的MoO_3。在H_&lt；1.55&Gt；MoO_3和Pt/MoO_3的还原过程中，氢钼青铜相分解后生成了MoO_xH_y。相比之下，MoO_3被还原为MoO_2，没有生成氢青铜。根据这些结果，我们认为氢钼青铜的H_2还原将产生MoO_xH_y相，它可以作为戊烷和丙烷-2-醇转化的活性相。

项目成果

期刊论文数量（11）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Effect of H_2 reduction on the catalytic properties of MoO_3 with noble metals for the conversions of pentane and propan-2-ol

H_2还原对贵金属MoO_3催化戊烷和2-丙醇转化性能的影响

DOI：
发表时间：
2004
期刊：
Phys.Chem.Chem.Phys. 6
影响因子：
0
作者：
Hirotoshi Sakagami;Hirotoshi Sakagami;Hirotoshi Sakagami;Hirotoshi Sakagami;Takeshi Matsuda;Takeshi Matsuda;Takeshi Matsuda
通讯作者：
Takeshi Matsuda

H2 reduction of hydrogen molybdenum bronze to porous molybdenum oxide and its catalytic properties for the conversions of pentane and propan-2-ol

DOI：
10.1016/j.apcata.2005.01.027
发表时间：
2005-04
期刊：
Applied Catalysis A-general
影响因子：
5.5
作者：
H. Sakagami;Y. Asano;N. Takahashi;T. Matsuda
通讯作者：
H. Sakagami;Y. Asano;N. Takahashi;T. Matsuda

H_2 reduction of hydrogen molybdenum oxide to porous molybdenum oxide its catalytic properties for the conversions of pentane and propan-2-ol

H_2氧化钼氢还原为多孔氧化钼及其对戊烷和2-丙醇转化的催化性能

DOI：
发表时间：
2005
期刊：
Applied Catalysis A General 284
影响因子：
0
作者：
Hirotoshi Sakagami
通讯作者：
Hirotoshi Sakagami

Effect of H_2 reduction on the catalytic properties of MoO_3 with noble metals for the conversions pentane and propan-2-ol

H_2还原对贵金属MoO_3转化戊烷和2-丙醇催化性能的影响

DOI：
发表时间：
2004
期刊：
Physical Chemistry Chemical Physics 6
影响因子：
0
作者：
Hirotoshi Sakagami;Hirotoshi Sakagami;Hirotoshi Sakagami;Hirotoshi Sakagami;Takeshi Matsuda
通讯作者：
Takeshi Matsuda

Pentane Isomerization over Molybdenum Oxide Prepared by H2 Reduction of a Hydrogen Molybdenum Bronze.

通过氢钼青铜的 H2 还原制备氧化钼的戊烷异构化。