| 摘要 |
A lithiated catalytic material capable of forming a continuous surface is made by depositing lithium onto a host metal or alloy, preferably selected from the Group IB and VIII metals i.e. Cu, Ag, Au, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir and Pt, and heating the metal/alloy-lithium system between 250 DEG C. and the melting-point of the host metal or alloy. The lithium may be present in amounts from 10-200 micrograms per sq. cm. surface area, and may be incorporated into the surface by immersing the host metal or alloy into molten lithium or a eutectic melt of Li diluted with Ca or Ba, such as 30% Li-70% Ca alloy, removing it and heating it in an atmosphere of A or He to 400-450 DEG C., excess Li being removed by immersion in water. Pt foil, Pd or Ni sheet, and 25% Ag-75% Pd wire are specified as the host metal or alloy. Alternatively, the host metal or alloy, e.g. 1% Ag-99% Pd foil, may be immersed in a solution of a lithium halide e.g. 10% LiBr in pyridine or acetonitrile, and the lithium electrodeposited e.g. under an A atmosphere prior to heating to 480 DEG C. Another method comprises dissolving Li in liquid ammonia from which the Li may be deposited by electroplating or without by diffusion under an atmosphere of He or A. Vapour deposition may be used, e.g. for producing a lithiated 14% Rh-86% Pt alloy sheet, wherein the Li may be evaporated from a Mo boat in an evacuated apparatus and the lithiated host metal or alloy thereafter heated e.g. to 500 DEG C. between W heating elements. The lithiated catalytic material may be in powder or granular form for use in hydrogenation, polymerization or reforming processes, or nonporous e.g. Pd or Pd-Ag alloy for use in constructing hydrogen purifiers, or sintered porous for constructing fuel cell electrodes (see Division H1).ALSO:A lithiated catalytic material capable of forming a continuous surface is made by depositing lithium on to a host metal or alloy of Group IB and/or VIII metals and heating the metal/alloy-lithium system between 250 DEG C and the melting-point of the host metal or alloy. The lithium may be present in amounts from 10-200 micrograms per sq. cam. surface area. The lithiated catalytic material may be in powder or granular form for use in hydrogenation, polymerization or reforming processes. |
