CATALYTIC BEHAVIOR OF GRAPHITE NANOFIBER SUPPORTED NICKEL PARTICLES. 3. THE EFFECT OF CHEMICAL BLOCKING ON THE PERFORMANCE OF THE SYSTEM
CATALYTIC BEHAVIOR OF GRAPHITE NANOFIBER SUPPORTED NICKEL PARTICLES. 3. THE EFFECT OF CHEMICAL BLOCKING ON THE PERFORMANCE OF THE SYSTEM
复制标题
DOI：
10.1021/jp983802d
复制
发表时间：
1999-03
影响因子：
3.3
通讯作者：
Colin Park;R. Terry K. Baker
中科院分区：
文献类型：
--
作者：
Colin Park;R. Terry K. Baker
石墨纳米纤维是一种新开发的材料，通过含碳气体在高温下的催化分解产生。这些构象的各个组成部分，小尺寸的石墨微晶，以这样一种方式排列，只有边缘区域暴露。在这些位置上的碳原子排列成两种构象，“扶手椅”或“之字形”，作为金属微晶成核的模板。用某些磷化合物处理石墨是一种已知导致优先阻塞“扶手椅”面的方法，而氧化硼选择性地替代“锯齿”面。在目前的调查中，发现在磷氧化物中预处理对随后的石墨负载镍催化剂的乙烯和1-丁烯加氢性能的影响很小或没有影响。相反，将硼引入碳质载体中，这导致了“之字形”位点的堵塞。
Graphite nanofibers are a newly developed type of material produced by the catalytic decomposition of carbon containing gases at high temperatures. The individual components of these conformations, small-sized graphite crystallites, are arranged in such a manner that only the edge regions are exposed. The carbon atoms at these sites that are arranged in two conformations, “armchair” or “zigzag”, act as templates for the nucleation of metal crystallites. Treatment of graphite with certain phosphorus compounds is a process that is known to result in preferential blocking of the “armchair” faces, whereas boron oxide selectively substitutes into the “zigzag” faces. In the current investigation pretreatment in phosphorus oxide was found to exert little or no effect on the subsequent catalytic performance of graphite nanofiber supported nickel with respect to hydrogenation of ethylene and 1-butene. In contrast, incorporation of boron into the carbonaceous support, which resulted in blockage of the “zigzag” site...