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Production method for noble-metal-cluster-supporting catalyst

A precious metal and catalyst technology, applied in the field of catalyst production, can solve the problems of not being able to prepare a large number of clusters, difficult loading of precious metals, and inability to provide

Inactive Publication Date: 2007-09-05
TOYOTA JIDOSHA KK
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

To produce size-controlled clusters, a technique is currently used: evaporating a metal target in a vacuum to produce clusters of various sizes, and then using the principle of mass spectrometry to separate these clusters, but this technique cannot produce clusters in large quantities
In addition, a technique using a complex is used as a preparation method of a catalyst, and when this technique is used, clusters can be produced simply and in large quantities, however, since the number of noble metal atoms contained in the complex is only one, the supported Noble metals are monoatomically dispersed and cannot provide clusters with an arbitrary number of constituent atoms
[0006] Loading noble metals with only the desired cluster size on oxide supports has so far been very difficult

Method used

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  • Production method for noble-metal-cluster-supporting catalyst
  • Production method for noble-metal-cluster-supporting catalyst
  • Production method for noble-metal-cluster-supporting catalyst

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Embodiment Construction

[0013] specific implementation plan

[0014] Figure 1 shows the method of the present invention. In the method of the present invention, a polynuclear complex 1 comprising a plurality of organic polydentate ligands 2 and a plurality of noble metal atoms 3 is firstly prepared. The multinuclear complex 1 has a closed capsule structure, and is prepared by reacting an organic multidentate ligand 2 and a noble metal atom 3 according to a common production method for complexes.

[0015] As the organic multidentate ligand 2, for example, organic compounds shown below can be used.

[0016]

[0017] As the noble metal atom 3, at least one selected from platinum, rhodium, palladium, gold, and iridium can be used.

[0018] Specifically, when using the compound shown below as the organic polydentate ligand 2,

[0019]

[0020] get with M 6 L 8 The composed capsule-like molecule acts as a polynuclear complex 1, as follows:

[0021]

[0022] Moreover, when using the compound ...

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Abstract

The present invention provides a method for more easily producing a controlled-cluster-size noble-metal catalyst. This method comprises depositing a polynuclear complex comprising a plurality of organic polydentate ligands and a plurality of noble metal atoms on an oxide support, and then removing the organic polydentate ligands.

Description

technical field [0001] The invention relates to a production method of a catalyst. More specifically, the present invention relates to a method for producing a catalyst having a controlled cluster size noble metal supported thereon. Background technique [0002] Exhaust gases emitted by internal combustion engines such as automobile engines contain carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x ), etc., these harmful substances are usually purified by exhaust gas purification catalysts, which mainly contain precious metals such as platinum (Pt), rhodium (Ph), palladium (Pd) and iridium (Ir) by loading on an oxide carrier such as alumina obtained from catalyst components. [0003] The noble metal as a catalyst component is generally loaded on the oxide support by the following process: using a solution of a noble metal compound modified by a nitric acid group or an amine group, and using the solution to impregnate the oxide support to disperse the noble meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/38B01J37/00B01D53/94
CPCB01J23/63B01J37/0203B01J23/40B01D2255/102B01D53/945B01J37/086B01J35/0013B01J23/38B01D2255/106B01J23/52Y02T10/22Y02T10/12
Inventor 平田裕人松本伸一
Owner TOYOTA JIDOSHA KK
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