基于层状双氢氧化物的高硫容量及可再生锌基吸附剂用于热煤气脱硫
High-sulfur capacity and regenerable Zn-based sorbents derived from layered double hydroxide for hot coal gas desulfurization.
作者信息
Wu Mengmeng, Chang Bingwei, Lim Teik-Thye, Oh Wen-Da, Lei Junxi, Mi Jie
机构信息
Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore.
Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.
出版信息
J Hazard Mater. 2018 Oct 15;360:391-401. doi: 10.1016/j.jhazmat.2018.08.015. Epub 2018 Aug 6.
The Zn-Al mixed metal oxide (ZnAl-MMO) with a plate-like structure was derived from Zn-Al layered double hydroxide. The ZnAl-MMO with a Zn/Al molar ratio of 3:1 exhibits superior absorption ability for HS in a simulated coal gas at 600 ℃ due to the special structure of the ZnAl-MMO. Besides ZnS, elemental sulfur is also produced during the desulfurization process. The deactivation model could well simulate the absorption behavior of HS. The sulfidation reaction over the sorbent shows large initial reaction rate constants (1110-5390 m min kg) and low activation energy (29.5 kJ mol). The regeneration rate of the used sorbent can reach 99.8% under the optimum conditions. The regenerated sorbents still show high sulfur capacity (ca. 30%), implying its great application potential for industrial-scale desulfurization of the hot coal gas.
具有板状结构的锌铝混合金属氧化物（ZnAl-MMO）由锌铝层状双氢氧化物衍生而来。锌铝摩尔比为3:1的ZnAl-MMO由于其特殊结构，在600℃的模拟煤气中对HS表现出优异的吸收能力。除了ZnS，脱硫过程中还会产生元素硫。失活模型能够很好地模拟HS的吸收行为。吸附剂上的硫化反应显示出较大的初始反应速率常数（1110 - 5390 m min kg）和较低的活化能（29.5 kJ mol）。在最佳条件下，用过的吸附剂的再生率可达99.8%。再生后的吸附剂仍具有较高的硫容量（约30%），这意味着其在热煤气工业规模脱硫方面具有巨大的应用潜力。
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