The simultaneous removal of hydrogen sulfide and ammonia over zinc-based dry sorbent supported on alumina

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• 作者：Suk Yong Jung ; Soo Jae Lee ; Jung Je Park ; Soo Chool Lee ; Hee Kwon Jun ; Tae Jin Lee ; Chong Kul Ryu ; Jae Chang Kim
• 关键词：Simultaneous removal ; NH₃ decomposition ; Desulfurization ; Zn– ; Al-based sorbent
• 刊名：Separation and Purification Technology
• 出版年：2008
• 出版时间：22 October 2008
• 年：2008
• 卷：63
• 期：2
• 页码：297-302
• 全文大小：858 K

文摘

To remove H₂S and NH₃ simultaneously from coal-based synthesis gas, Zn–Al-based sorbents promoted with transition metals such as cobalt, nickel and iron additives were prepared by the co-precipitation method. The decomposition of NH₃ and the absorption capacities of H₂S of the sorbents were studied in a micro-reactor at 1 atm and 650 °C. The additives, cobalt, nickel and iron, were found to be active components in the NH₃ decomposition reaction as well as in the absorption of H₂S, while the major components, ZnO and Al₂O₃, did not show any activity in the NH₃ decomposition reaction. Especially, cobalt oxide showed excellent NH₃ decomposition ability, regardless of the H₂ concentration, while the ability of iron and nickel oxides depended on the H₂ concentration. After the oxides were converted to the sulfide form, the NH₃ decomposition rates over the cobalt and nickel sulfides were dramatically decreased in the presence of excess H₂. Optimized Zn–Al-based sorbent promoted with cobalt oxide was prepared and showed excellent NH₃ decomposition ability under a gas composition of 11 % H₂, 1 % H₂S and 0.5 % NH₃, which was due to the improvement of its physical properties such as its surface area, pore size and pore volume, and nano-particle size.