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    • 88. 发明授权
    • CATALYSTS FOR AMMONIA SYNTHESIS
    • 氨合成催化剂
    • EP1451107B1
    • 2008-12-31
    • EP02782956.3
    • 2002-10-18
    • Ammonia Casale S.A.
    • FORNI, LucioPERNICONE, Nicola
    • C01C1/04B01J23/46B01J21/18
    • B01J23/58B01J21/18B01J23/462B01J35/002B01J35/1019B01J37/0205C01C1/0411Y02P20/52
    • We claim catalysts for ammonia synthesis based on ruthenium, directly supported over graphite having BET specific surface area in excess of 10 m /g, preferably in excess of 100 m /g and more preferably in excess of 280 m /g, said graphite being characterised by X-ray diffraction pattern containing the diffraction lines characteristic of the crystalline graphite only, with exclusion of relevant bands due to amorphous carbon, to which catalysts barium, caesium and potassium are added as promoters. The graphitic supports allow to avoid the known pre-treatments and post-treatments needed in the case of supports obtained by partial graphitisation of active carbons and during use they are affected negligibly by the methanation shown by the supports obtained from active carbons. Furthermore, the catalysts of the present invention are characterised by a very high activity, even with ruthenium loadings well below the known loading.
    • 我们要求保护基于钌的氨合成催化剂,其直接负载在BET比表面积超过10m 2 / g,优选超过100m 2 / g,更优选超过280m 2 / g的石墨上, g,所述石墨的特征在于X射线衍射图仅包含结晶石墨的衍射线特征,排除由无定形碳引起的相关谱带,催化剂中加入钡,铯和钾作为助催化剂。 石墨载体允许避免在通过活性炭部分石墨化获得的载体的情况下所需的已知预处理和后处理,并且在使用期间它们受从活性炭获得的载体显示的甲烷化可忽略的影响。 此外,本发明的催化剂的特征在于非常高的活性,即使钌加载量远低于已知的加载量。