초록 ▼

Finely divided noble metal-refractory metal alloys and methods for making them are disclosed. As catalysts these alloys have greater activity than a catalyst of the same unalloyed noble metal and may be advantageously used as electrodes for fuel cells particularly when supported. The method for maki

Finely divided noble metal-refractory metal alloys and methods for making them are disclosed. As catalysts these alloys have greater activity than a catalyst of the same unalloyed noble metal and may be advantageously used as electrodes for fuel cells particularly when supported. The method for making supported catalysts involves a simple and inexpensive procedure for converting a supported, finely divided noble metal catalyst to the desired alloy. In a preferred embodiment the process includes intimately contacting the supported noble metal catalyst with a finely divided refractory metal oxide, the metallic component of which is capable of enhancing the activity of the catalyst when alloyed therewith, and then heating to a sufficiently high temperature, preferably in a reducing atmosphere, to reduce the oxide and simultaneously form a finely divided, supported alloy of the noble metal and the metallic component of the oxide.

대표청구항 ▼

A method for making carbon supported noble metal-refractory metal alloy catalysts comprising: (a) providing a supported unalloyed noble metal catalyst in the form of a carbon support material having finely-divided noble metal particles uniformly dispersed on its surface; and (b) reacting the carbon

A method for making carbon supported noble metal-refractory metal alloy catalysts comprising: (a) providing a supported unalloyed noble metal catalyst in the form of a carbon support material having finely-divided noble metal particles uniformly dispersed on its surface; and (b) reacting the carbon supported noble metal catalyst particles with a refractory metal oxide by intimately contacting the carbon supported noble metal particles with finely divided particles of said metal oxide and heating to a sufficiently high temperature in a locally reducing environment to thermocatalytically reduce the oxide and at the same time form an alloy between the noble metal and the refractory metal, wherein said carbon support material provides the locally reducing environment and the support for said alloy.