Strong metal-support interactions: Occurrence among the binary oxides of groups IIA–VB
Strong metal-support interactions: Occurrence among the binary oxides of groups IIA–VB
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DOI：
10.1016/0021-9517(78)90182-3
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发表时间：
1978-10
影响因子：
7.3
通讯作者：
S. Tauster;S. C. Fung
中科院分区：
文献类型：
--
作者：
S. Tauster;S. C. Fung
以IIA、IIIB、IVB和VB族的多种氧化物为载体的Ir在200°C还原后表现出正常的H2化学吸附(Ir-Al_2O_3和Ir-SiO_2的典型特征)。如果负载在镁、Sc_2O_3、Y_2O_3、ZrO_2或HfO_2上，这一行为不会受到还原温度⩽700°C的严重影响。然而，如果载体是TiO_2、V_2O_3或Nb_2O_5 H_M在500℃下还原到接近零，而Ta_2O_5则需要700°C才能还原。根据可还原的过渡金属氧化物载体的需要和已知化合物提出的成键机制，讨论了这种强烈的金属-载体相互作用。
Iridium, supported on a number of oxides from Groups IIA, IIIB, IVB, and VB, exhibits normal H 2-chemisorption (typical of Ir Al 2 O 3 and Ir SiO 2) following reduction at 200° C. If supported on MgO, Sc 2 O 3, Y 2 O 3, ZrO 2, or HfO 2, this behavior is not seriously affected by reduction temperatures⩽ 700° C. If, however, the carrier is TiO 2, V 2 O 3, or Nb 2 O 5 H M is decreased to near-zero by reduction at 500° C, while Ta 2 O 5 requires 700° C for this. This strong metal-support interaction is discussed in terms of the need for a reducible, transition metal oxide support and on the basis of bonding mechanisms suggested by known compounds.