纳米Ni-Co-B非晶态合金抗氧化行为的原位XPS研究

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (3): 473.

纳米Ni-Co-B非晶态合金抗氧化行为的原位XPS研究

戴维林, 曹勇, 范康年, 邓景发

复旦大学化学系, 上海市分子催化与创新材料实验室, 上海 200433

收稿日期:2002-04-23 出版日期:2003-03-24 发布日期:2003-03-24
通讯作者: 戴维林(1969年出生),男,博士,副教授,从事原位谱学表征及多相催化反应研究.E-mail:wldai@fudan.edu.cn E-mail:wldai@fudan.edu.cn
基金资助:
国家重点基础研究发展规划项目(批准号:G2000048009)资助

In situ XPS Studies on the Anti-oxidation Effects of Nano-sized Ni-Co-B Amorphous Alloy

DAI Wei-Lin, CAO Yong, FAN Kang-Nian, DENG Jing-Fa

Shanghai Key Laboratory of Molecular Catalysis & Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China

Received:2002-04-23 Online:2003-03-24 Published:2003-03-24

摘要/Abstract

摘要： 采用原位XPS手段研究了纳米非晶态Ni-Co-B合金中B和Co的抗氧化行为、表面组成与氧化处理条件之间的关系以及各元素含量随深度的变化趋势.结果发现,氧优先氧化表面的元素B物种,在元素态B被完全耗尽后才开始氧化表面的元素态Co物种,在元素态B和Co均被完全氧化后,元素态Ni才开始被氧化.另外,研究还发现,在氧化过程中,B和Co的氧化物具有在表面富集的倾向.正是由于B和Co的优先被氧化才保护了催化加氢反应中的活性中心——元素态Ni.

关键词: Ni-Co-B非晶态合金, 抗氧化行为, 原位XPS

Abstract: In situ XPS was used to study the anti-oxidation behavior of Co and B in nano-sized Ni-Co-B amorphous alloy and the relationship between the surface contents and the treating oxidation conditions by O₂ as well as the changes of the surface elemental contents with the depth of the sample. It was found that the elemental B was preferably oxidized, then the elemental Co could be oxidized. After all elemental B and Co were used up, the surface elemental Ni began to be oxidized by O₂. In addition, the oxides from B and Co were inclined to enrich on the surface after the oxidation. It was the preferential oxidation of B and Co that protected the Ni active centers from oxidation during the catalytic hydrogenation.

Key words: Amorphous Ni-Co-B alloy, Anti-oxidation behavior, In situ XPS

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TrendMD:

戴维林, 曹勇, 范康年, 邓景发. 纳米Ni-Co-B非晶态合金抗氧化行为的原位XPS研究. 高等学校化学学报, 2003, 24(3): 473.

DAI Wei-Lin, CAO Yong, FAN Kang-Nian, DENG Jing-Fa . In situ XPS Studies on the Anti-oxidation Effects of Nano-sized Ni-Co-B Amorphous Alloy. Chem. J. Chinese Universities, 2003, 24(3): 473.