Synergism of Co and Mo in the catalytic production of single-wall carbon nanotubes by decomposition of CO
Synergism of Co and Mo in the catalytic production of single-wall carbon nanotubes by decomposition of CO
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DOI：
10.1016/s0008-6223(00)00173-1
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发表时间：
2001-01-01
期刊：
影响因子：
10.9
通讯作者：
Resasco, DE
中科院分区：
文献类型：
--
作者：
Alvarez, WE;Kitiyanan, B;Resasco, DE
为了提高单壁碳纳米管的选择性，系统地研究了CO分解合成单壁碳纳米管的催化剂组成和操作条件。基于标准程序升温氧化（TPO）技术的一种简单的定量方法使我们能够确定CO分解反应后催化剂上存在的不同形式的碳质沉积物的分布。Co和Mo之间存在协同效应。当两种金属同时存在时，特别是当Mo过量时，催化剂非常有效。然而，当它们分离时，它们要么是非活性的（Mo单独），要么是非选择性的（Co单独）。为了理解这种协同效应，x射线吸收光谱（EXAFS和XANES）已经被用来表征催化剂上Co和Mo的状态：在生产SWNT之前和之后。(C) 2001年Elsevier Science Ltd.出版
The catalyst composition and operating conditions for the synthesis of single-wall carbon nanotubes (SWNT) from CO decomposition have been systematically varied in order to maximize the selectivity towards SWNT. A simple quantification method based on the standard Temperature Programmed Oxidation (TPO) technique has allowed us to determine the distribution of the different forms of carbonaceous deposits present on the catalysts after the CO decomposition reaction. A synergistic effect between Co and Mo has been observed. When both metals are simultaneously present, particularly when Mo is in excess, the catalyst is very effective. However, when they are separated they are either inactive (Mo alone) or unselective (Co alone). To understand this synergistic effect, X-ray absorption spectroscopy (EXAFS and XANES) has: been used to characterize the state of Co and Mo on the catalysts: before and after the production of SWNT. (C) 2001 Published by Elsevier Science Ltd.