Evidence for the antioxidation effect of boron on the ultrafine amorphous Ni-B alloy catalyst
Evidence for the antioxidation effect of boron on the ultrafine amorphous Ni-B alloy catalyst
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DOI：
10.1021/la026116l
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发表时间：
2002-11
期刊：
影响因子：
3.9
通讯作者：
W. Dai;Hexing Li;Yong Cao;M. Qiao;Kangnian Fan;Jingfa Deng
中科院分区：
文献类型：
--
作者：
W. Dai;Hexing Li;Yong Cao;M. Qiao;Kangnian Fan;Jingfa Deng
近年来，非晶态金属合金作为有前途的新型催化材料受到了广泛关注。1与晶态金属合金相比，非晶态金属合金独特的各向同性结构和高浓度的配位不饱和位点导致了上级催化活性和选择性。其中，超细非晶态Ni-B催化剂因其独特的结构特征和表面性质而得到了广泛的研究。基于扩展X射线吸收精细结构（EXAFS）、密度泛函理论（DFT）、X射线光电子能谱（XPS）等现代技术，一般认为，硼给金属镍提供电子，硼的存在导致了短程有序和长程无序结构。本文用XPS和氧作为探针分子，明确地揭示了合金化的硼可以很容易地阻止金属镍的氧化，这是一个在实际催化过程中非常理想的性能。
Recently, amorphous metal alloys have gained much attention as promising novel catalytic materials.1 Their unique isotropic structure and high concentration of coordinatively unsaturated sites lead to superior catalytic activity and selectivity compared to their crystalline counterparts. Among them, ultrafine amorphous Ni-B catalysts have been most extensively studied on their special structural characteristics and surface properties. Based on modern techniques, such as extended X-ray absorption fine structure (EXAFS),2 density function theory (DFT),3 X-ray photoelectron spectroscopy (XPS),4 etc., it is accepted that boron donates electrons to metallic nickel, and the presence of boron results in the shortrange ordering and long-range disordering structure. In this paper, by means of XPS and using oxygen as the probing molecule, we unambiguously revealed that the alloying boron can readily prevent the oxidation of metallic nickel, which is a highly desirable property in practical catalytic processes.