Purified oxygen- and nitrogen-modified multi-walled carbon nanotubes  as metal-free catalysts for selective olefin hydrogenation

Peirong Chen; Ly May Chew; Aleksander Kostka; Kunpeng Xie; Martin Muhler; Wei Xia

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Purified oxygen- and nitrogen-modified multi-walled carbon nanotubes as metal-free catalysts for selective olefin hydrogenation

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Oxygen-and nitrogen-functionalized carbon nanotubes (OCNTs and NCNTs) were applied as metal-free catalysts in selective olefin hydrogenation. A series of NCNTs was synthesized by NH3 post-treatment of OCNTs. Temperature-programmed desorption, N2 physisorption, Raman spectroscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy were employed to characterize the surface properties of OCNTs and NCNTs, aiming at a detailed analysis of the type and amount of oxygenand nitrogen-containing groups as well as surface defects. The gas-phase treatments applied for oxygen and nitrogen functionalization at elevated temperatures up to 600 C led to the increase of surface defects, but did not cause structural damages in the bulk. NCNTs showed a clearly higher activity than the pristine CNTs and OCNTs in the hydrogenation of 1,5-cyclooctadiene, and also the selectivity to cyclooctene was higher. The favorable catalytic properties are ascribed to the nitrogen-containing surface functional groups as well as surface defects related to nitrogen species. In contrast, oxygen-containing surface groups and the surface defects caused by oxygen species did not show clear contribution to the hydrogenation catalysis.

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《能源化学：英文版》 |2013年第002期|P.312-320|共9页
作者
Peirong Chen; Ly May Chew; Aleksander Kostka; Kunpeng Xie; Martin Muhler; Wei Xia;
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作者单位

of;

lndustrial;

Chemistry,;

Ruhr-University;

Bochum,;

44780;

Bochum,;

Germany;

of;

Microstructure;

Physics;

and;

Alloy;

Design,;

Max-Planck-lnstitute;

for;

Iron;

Research,;

40237;

Diisseldo~;

Germany;

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原文格式 PDF
正文语种 CHI
中图分类热化学;
关键词
多壁碳纳米管; 金属催化剂; 含氮; 烯烃; X-射线光电子能谱; 透射电子显微镜; 氧; 表面缺陷;

机译：多壁碳纳米管;金属催化剂;含氮;烯烃;X-射线光电子能谱;透射电子显微镜;氧;表面缺陷;

Purified oxygen- and nitrogen-modified multi-walled carbon nanotubes as metal-free catalysts for selective olefin hydrogenation

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