文献类型：期刊文献

英文题名：Alkaline carbon nanotubes as effective catalysts for H2S oxidation

作者：Chen, Qingjun[1]; Wang, Jitong[1]; Liu, Xiaojun[1]; Zhao, Xin[1]; Qiao, Wenming[1]; Long, Donghui[1]; Ling, Licheng[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2011

卷号：49

期号：12

起止页码：3773

外文期刊名：Carbon

收录：EI(收录号：20112814129784)

语种：英文

外文关键词：High resolution transmission electron microscopy - Yarn - X ray diffraction - Sodium Carbonate - Thermogravimetric analysis - Catalyst activity - Oxidation - Sulfur - Scanning electron microscopy

摘要：Carbon nanotubes (CNTs) were made alkaline by impregnation with Na 2CO3 and used for the direct oxidation of H2S into sulfur at 30 °C. The alkaline CNTs before and after H2S oxidation were characterized by N2 adsorption, scanning and transmission electron microscopy, X-ray diffraction, and thermogravimetry analysis. The effects of Na2CO3 loading and the structure of the CNTs on the catalytic activity of alkaline CNTs were investigated. Results indicated that the saturation sulfur capacity of alkaline CNTs was up to 1.86 g H2S/g catalyst, which was about 3.9 times higher than that of a common commercial H2S oxidation catalyst. The introduction of Na2CO3, which provided alkalinity needed for H 2S dissociation, significantly enhanced the catalytic performance. The optimum content of Na2CO3 loading was determined to be 20 wt.% in the CNTs. The catalytic performance was also dependent on the structure of the CNTs, and the single-walled CNTs with the smallest tube diameter exhibited the highest sulfur capacity. Tangled CNTs provided their external voids to store the sulfur produced, which was a key feature of this high-performance CNT catalyst. ? 2011 Elsevier Ltd. All rights reserved.