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лл£¬ÎÒÊÇ¿´ÎÄÏ×ÉϽ²µÃ£¬×÷ÕßÌáµ½ÁËÒ»¸ö¡°Sanderson¡¯s electronegativity ¡±£¬ËùÒÔÏëÖªµÀÕâ¸öԭʼÊý¾ÝÔÚÄÄÀ˳±ã²é²éÑõ»¯ÂÁµÄµç¸ºÐÔ£¬¾ÍÊÇÕâ¸öÄ¿µÄ£¬ºÇºÇ¡£ÄãÌáµ½µÄSandersonµç¸ºÐÔ±ê¶È¾ÍÊÇÎÒÒªÕÒµÄÊý¾Ý¡£

Sanderson¡¯s electronegativity of compounds was used as a measure of the electronic nature: 2.64 (TiO2), 2.38 (CeO2), 2.28 (Sm2O3), 2.20 (La2O3), and 2.05 (MgO) (2). It can be reasonably understood why Ru/MgO is active but Ru/TiO2 is significantly less active. Then, why is lanthana so effective even though it has a higher value (than that of MgO)? The electronegativity of Ce2O3 (2.28), in a reduced state, is still higher than that of MgO (2.05). The electron-donating effect of metallic cerium has been reported in the Ce¨CRu (0001) system (12). But ceria may not be reduced to the metallic state.

Journal of  catalysis 162, 138¨C142 (1996)
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