Performance evaluation of the carbon nanotubes supported Cs2.5H0.5PW12O40 as efficient and recoverable catalyst for the oxidative removal of dibenzothiophene
Performance evaluation of the carbon nanotubes supported Cs2.5H0.5PW12O40 as efficient and recoverable catalyst for the oxidative removal of dibenzothiophene
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DOI：
10.1016/j.cattod.2009.10.001
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发表时间：
2010-02-26
期刊：
影响因子：
5.3
通讯作者：
Zhao, Haixia
中科院分区：
文献类型：
--
作者：
Wang, Rui;Yu, Fengli;Zhao, Haixia
随着对运输燃料中硫含量的法规要求越来越严格，包括脱硫在内的清洁燃料研究已成为环境催化研究的一个重要课题。氧化脱硫与萃取相结合是最有前途的脱硫方法之一。以多壁碳纳米管（MWNT）为载体，负载Cs2.5H0.5PW12O40，制备了一种新型的催化剂（Cs2.5H0.5PW12O40/MWNT）。通过实验评价，发现Cs2.5H0.5PW12O40/MWNT对DBT的氧化去除非常有效，脱硫效率高达100%。考察了反应温度、O/S摩尔比、初始硫含量、催化剂用量、催化剂预浸时间等因素对反应的影响，确定了适宜的操作条件。在Cs2.5H0.5PW12O40/MWNT存在下，DBT氧化反应160 min后，经GC-MS分析，砜类物质是DBT氧化反应的唯一产物。回收的Cs_（2.5）H_（0.5）PW_（12）O_（40）/MWNT催化剂的催化活性与新鲜样品相当。综合来看，Cs2.5H0.5PW12O40/MWNT具有很好的柴油深度脱硫活性。(C)2009爱思唯尔有限公司版权所有。
With the issues of increasingly stringent legislations on sulfur level in transportation fuels, clean fuels research including desulfurization has become a more important subject of environmental catalysis Studies. Oxidative desulfurization (ODS) combined with extraction is one of the most promising desulfurization processes. With the loading of Cs2.5H0.5PW12O40, a new multi-walled carbon nanotube (MWNT) supported catalyst (Cs2.5H0.5PW12O40/MWNT) has been developed in this study. Through experimental evaluations, Cs2.5H0.5PW12O40/MWNT was found to be very effective for the oxidative removal of DBT, with a desulfurization efficiency of up to 100%. Factors affecting the process, including reaction temperature, O/S molar ratio, initial sulfur content, catalyst dosage, and pre-immersion time of the catalyst in H2O2 solution, were evaluated, and the favourable operating conditions were determined. Sulfone species was confirmed by GC-MS analysis to be the only product from DBT oxidation by H2O2 in the presence Of Cs2.5H0.5PW12O40/MWNT after 160 min. Moreover, the new catalyst developed is recoverable. The recovered Cs2.5H0.5PW12O40/MWNT demonstrates quite close catalytic activity to that of the fresh. As a whole, Cs2.5H0.5PW12O40/MWNT has a high potential for using as an effective catalyst for deep desulfurization of diesel. (C) 2009 Elsevier B.V. All rights reserved.