Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas
Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas
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DOI：
10.1016/j.fuel.2008.06.011
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发表时间：
2008-12
期刊：
影响因子：
7.4
通讯作者：
M. Ozaki;M. Uddin;E. Sasaoka;Shengji Wu
中科院分区：
文献类型：
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作者：
M. Ozaki;M. Uddin;E. Sasaoka;Shengji Wu
煤制燃气脱汞工艺的开发是发展清洁高效燃煤发电系统的重要课题。最近，铁基吸附剂如氧化铁（Fe2O3）、负载在TiO2上的氧化铁和二硫化铁已被提议作为活性汞吸附剂。Hg0在铁基吸附剂上与H2S发生反应，从而捕集了汞。然而，吸附剂上捕获的汞物质尚未直接表征。捕获的汞物种太小，无法识别，因为Hg0的浓度非常低（ppb级）。在这项研究中，程序升温分解技术的应用，以了解铁基吸附剂上捕获的汞物种的分解特性。在实验室规模的固定床反应器中，在80°C下使用模拟燃料气进行Hg0去除实验。在Hg0去除实验之后，使用原子吸收分光光度计在相同的固定床反应器中进行捕获的汞物种的解吸。程序升温分解脱附（TPDD）实验表明，吸附剂上捕获的汞物种的分解特性与HgS试剂（朱砂和偏朱砂）相似。此外，还观察到汞物种的分解特性取决于吸附剂的吸附剂类型和反应条件。
Development of an elemental mercury (Hg0) removal process for coal derived fuel gas is an important issue in the development of a clean and highly efficient coal power generation system. Recently, iron-based sorbents such as iron oxide (Fe2O3), supported iron oxide on TiO2, and iron disulfide have been proposed as active mercury sorbents. It was supposed that Hg0reacted with H2S on the iron-based sorbents and captured mercury. However, the mercury species captured on the sorbents have not been directly characterized yet. The captured mercury species was too small to identify because the concentration of Hg0was very low (ppb order). In this study, a temperature programmed decomposition technique is applied in order to understand the decomposition character of the mercury species captured on iron-based sorbents. The Hg0removal experiments were carried out in a laboratory-scale fixed-bed reactor at 80°C using simulated fuel gas. After the Hg0removal experiments, desorption of the captured mercury species was carried out in the same fixed-bed reactor using an atomic absorption spectrophotometer. Temperature programmed decomposition desorption (TPDD) experiments revealed that the decomposition characteristic of mercury species captured on the sorbent was similar to that of HgS reagents (cinnabar and meta-cinnabar). Furthermore, it was observed that the characteristics of the decomposition of mercury species depended on the sorbent type of sorbents and reaction conditions.