A novel route of enhancing oxidative catalytic activity: hydroxy la t ion of MWCNTs induced by sectional defects

Richuan Rao; Ming Yang; Qiang Ling

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A novel route of enhancing oxidative catalytic activity: hydroxy la t ion of MWCNTs induced by sectional defects

机译：增强氧化催化活性的新型途径：由截面缺陷诱导的MWCNT的羟基

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As metal-free catalysts, the functionalization of multi-walled carbon nanotubes (MWCNTs) can usually provide the activated sites for oxidative dehydrogenation (ODH). In this paper a novel functionalization of MWCNTs has been proposed via an alkali-assisted hydrothermal treatment on the sectional defects produced by ball milling. The as-prepared hydroxylated MWCNTs exhibit twice the catalytic activity of MWCNTs without ball milling, because the ball-milled treatment leads to the production of more sectional defects located on exposed edges or terminals of MWCNTs and these defects can induce the creation of more hydroxyl groups by an alkali-assisted hydroxylation. The research on the reaction mechanism reveals that the ODH of ethylbenzene (EB) in the presence of CO2 for the hydroxylated MWCNTs takes on a possible mechanism of two-step dehydrogenation by coupling a reverse water-gas shift reaction and CO2 may oxidize hydroxyl groups into carbonyl groups to maintain the catalytic cycle.

机译：作为无金属催化剂，多壁碳纳米管（MWCNT）的功能化通常可以提供激活的位点进行氧化脱氢（ODH）。在本文中，已经通过碱辅助的热液处理对球铣削产生的截面缺陷提出了一种新的MWCNT功能化。准备好的羟基化MWCNT表现出两倍的MWCNT催化活性而无需磨球，因为球磨的治疗会导致在MWCNT的裸露边缘或终端上产生更多的截面缺陷，并且这些缺陷可以诱导更多的羟基组创建更多的羟基组通过碱辅助羟基化。对反应机制的研究表明，在二氧化碳存在下乙基苯（EB）的ODH用于羟基化MWCNTs采用了两步脱氢作用的可能机制，通过将反向水 - 气流转移和CO2偶联成氧化氧化物可能氧化为羟基中的羟基中的羟基羰基以维持催化周期。

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《Catalysis science & technology》 |2014年第3期|665-671|共7页
作者
Richuan Rao; Ming Yang; Qiang Ling;
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作者单位

Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.;

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原文格式 PDF
正文语种英语
中图分类汉语教学;
关键词
FUNCTIONALISED; Reaction Mechanisms; Carbon DioxideBall millingMulti-Walled NanotubeHydroxyl groupShift reactionCatalyst activity;

机译：官能化的;反应机制;二氧化碳磨坊壁壁焊接纳米羟基基团缩合反应催化剂活性;

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A novel route of enhancing oxidative catalytic activity: hydroxy la t ion of MWCNTs induced by sectional defects

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