Pd/Al2O3 Sorbents for Elemental Mercury Capture at High Temperatures in Syngas

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• 作者：Wenhui Hou ; Jinsong Zhou ; Chunjiang Yu ; Shulin You ; Xiang Gao ; Zhongyang Luo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：June 11, 2014
• 年：2014
• 卷：53
• 期：23
• 页码：9909-9914
• 全文大小：330K
• 年卷期：v.53,no.23(June 11, 2014)
• ISSN：1520-5045

文摘

To capture elemental mercury (Hg⁰) at high temperatures in simulated syngas, Pd/Al₂O₃ sorbents were developed using an impregnation method. The Pd/Al₂O₃ sorbents with a Pd loading value of 8% exhibited high Hg⁰ capture activity from 200 to 270 掳C. Over 90% of the mercury capture by 8Pd/Al₂O₃ was achieved for operating temperatures up to 270 掳C. The superior performance of Pd/Al₂O₃ sorbents could be primarily ascribed to the formation of a Pd鈥揌g amalgam. H₂ and CO were found to be promotional on Hg⁰ capture because of the reduction of PdO to Pd metal. H₂S significantly inhibited Hg⁰ capture due to the consumption of the active palladium. HCl promoted Hg⁰ capture, which could be ascribed to the catalytic oxidation of Hg⁰ to HgCl₂. H₂O showed a prohibitive effect on Hg⁰ removal. The regeneration experiments indicated that the spent Pd/Al₂O₃ sorbents could be facilely revivified and reused.