(DE19517598-C1)      Pt-Al alloy catalyst on a conducting carbon carrier is claimed, in which the atomic ratio of Pt to Al is 80-60: 20-40 and the alloy particles are present on the carbon carrier in carbided form with the structure of the Pt-Al carbide (Pt3AlC0.5). Prodn. of the catalyst is also claimed.    USE -   The catalyst is used as an electro catalyst in phosphoric acid fuel cells (PAFC) or in polymer electrolyte membrane fuel cells (PEMFC).    ADVANTAGE -   The catalyst has higher activity and improved ageing stability.    (JP9017435-A)      Pt-Al alloy catalyst on a conducting carbon carrier is claimed, in which the atomic ratio of Pt to Al is 80-60: 20-40 and the alloy particles are present on the carbon carrier in carbided form with the structure of the Pt-Al carbide (Pt3AlC0.5). Prodn. of the catalyst is also claimed.    USE -   The catalyst is used as an electro catalyst in phosphoric acid fuel cells (PAFC) or in polymer electrolyte membrane fuel cells (PEMFC).    ADVANTAGE -   The catalyst has higher activity and improved ageing stability.    (US5767036-A)      Pt-Al alloy catalyst on a conducting carbon carrier is claimed, in which the atomic ratio of Pt to Al is 80-60: 20-40 and the alloy particles are present on the carbon carrier in carbided form with the structure of the Pt-Al carbide (Pt3AlC0.5). Prodn. of the catalyst is also claimed.    USE -   The catalyst is used as an electro catalyst in phosphoric acid fuel cells (PAFC) or in polymer electrolyte membrane fuel cells (PEMFC).    ADVANTAGE -   The catalyst has higher activity and improved ageing stability.    (JP2880450-B2)      Pt-Al alloy catalyst on a conducting carbon carrier is claimed, in which the atomic ratio of Pt to Al is 80-60: 20-40 and the alloy particles are present on the carbon carrier in carbided form with the structure of the Pt-Al carbide (Pt3AlC0.5). Prodn. of the catalyst is also claimed.    USE -   The catalyst is used as an electro catalyst in phosphoric acid fuel cells (PAFC) or in polymer electrolyte membrane fuel cells (PEMFC).    ADVANTAGE -   The catalyst has higher activity and improved ageing stability.    (EP743092-B1)      Pt-Al alloy catalyst on a conducting carbon carrier is claimed, in which the atomic ratio of Pt to Al is 80-60: 20-40 and the alloy particles are present on the carbon carrier in carbided form with the structure of the Pt-Al carbide (Pt3AlC0.5). Prodn. of the catalyst is also claimed.    USE -   The catalyst is used as an electro catalyst in phosphoric acid fuel cells (PAFC) or in polymer electrolyte membrane fuel cells (PEMFC).    ADVANTAGE -   The catalyst has higher activity and improved ageing stability.