Oxidative desulfurization of benzothiophene and thiophene with WOx/ZrO2 catalysts: Effect of calcination temperature of catalysts
Oxidative desulfurization of benzothiophene and thiophene with WOx/ZrO2 catalysts: Effect of calcination temperature of catalysts
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DOI：
10.1016/j.jhazmat.2011.12.059
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发表时间：
2012-02-29
影响因子：
13.6
通讯作者：
Jhung, Sung Hwa
中科院分区：
文献类型：
--
作者：
Hasan, Zubair;Jeon, Jaewoo;Jhung, Sung Hwa
采用不同焙烧温度的WOx/ZrO 2催化剂对含苯并噻吩（BT）和噻吩（Th）的模拟燃料进行氧化脱硫（ODS）。基于BT在模型燃料中的转化率，可以表明WOx/ZrO 2催化剂的最佳煅烧温度为700 ℃左右。活性最高的催化剂由具有良好分散的多钨酸盐物种的四氧化锆（ZrO 2）组成，并且为了高BT转化率，必须使结晶WO 3和单斜ZrO 2的含量最小化。氧化速率与一级动力学解释，它表明了电子密度的重要性，因为BT的动力学常数高于Th，即使BT是大于Th的尺寸。经适当处理的WOx/ZrO_2催化剂可作为ODS中可重复使用的活性催化剂。(C)2012爱思唯尔有限公司版权所有。
Oxidative desulfurization (ODS) of model fuel containing benzothiophene (BT) or thiophene (Th) has been carried out with WOx/ZrO2 catalyst, which was calcined at various temperatures. Based on the conversion of BT in the model fuel, it can be shown that the optimum calcination temperature of WOx/ZrO2 catalyst is around 700 degrees C. The most active catalyst is composed of tetragonal zirconia (ZrO2) with well dispersed polyoxotungstate species and it is necessary to minimize the contents of the crystalline WO3 and monoclinic ZrO2 for a high BT conversion. The oxidation rate was interpreted with the first-order kinetics, and it demonstrated the importance of electron density since the kinetic constant for BT was higher than that for Th even though the BT is larger than Th in size. A WOx/ZrO2 catalyst, treated suitably, can be used as a reusable active catalyst in the ODS. (C) 2012 Elsevier B.V. All rights reserved.