Online Detection of Selenium and Its Retention in Reducing Gasification Atmosphere

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• 作者：Philip Edinger ; Mohamed Tarik ; Adrian Hess ; Andrea Testino ; Christian Ludwig
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：30
• 期：2
• 页码：1237-1247
• 全文大小：461K
• ISSN：1520-5029

文摘

The emission of selenium from coal gasification processes can cause harm to the environment and downstream equipment. With upcoming legislation, reliable detection as well as control of such gas species become crucial. This study therefore addresses the development and successful employment of an online analytical method, based on the direct introduction of a simplified flue gas (H₂, H₂O, H₂Se, Ar) into an ICP-MS. In combination with matrix matched calibration, the calculated and verified detection limits of H₂Se lie below 1 ppbv, thus being comparable to current offline methods. These low detection limits and the high temporal resolution (>1 Hz) enable the use of this method as a quick and robust tool for the lab- and bench-scale performance evaluation of sorbent materials. As a case study, Zn/Al₂O₃ was tested toward H₂Se capturing at warm temperatures (150–350 °C). The results show that both, the support and the active phase, interact with the contaminant. While γ-Al₂O₃ can retain H₂Se at dry reaction conditions, a Zn phase is needed for its capture in steam laden gas.