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首页> 外文期刊>Fuel >Desulfurization behavior of zinc oxide based sorbent modified by the combination of Al_2O_3 and K_2CO_3
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Desulfurization behavior of zinc oxide based sorbent modified by the combination of Al_2O_3 and K_2CO_3

机译：Al_2O_3和K_2CO_3组合改性的氧化锌基吸附剂的脱硫行为。

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摘要

In order to reduce the unfavorable effect of carbon oxide on desulfurization efficiency for zinc oxide based sorbent and decrease the concentration of carbonyl sulfide in effluent gas during desulfurization process, the modification of zinc oxide based sorbent is necessary in the preparation of zinc oxide based desulfurization sorbent. In this paper, the modified ZnO based desulfurization sorbents were obtained by mixing of active zinc oxide with different additives, which include graphite, Al_2O_3 and K_2CO_3, then shaping at ambient temperature, drying at 120℃ and calcinating at 550℃. The desulfurization performances for the prepared ZnO based desulfurization sorbents were tested in a quartz upflow fixed-bed reactor under the condition of 300℃, 2000 h~(-1) and simulated coal-derived gas. The phases of sorbents before and after desulfurization were characterized by X-ray diffractometer, and their pore structures were measured by N_2 adsorption-desorption method. The experimental results show that COS was present in effluent gas for ZnO based sorbent while removing H_2S from simulated coal-derived gas at experimental condition. ZnO based desulfurization sorbent modified by the combination of K_2CO_3 and Al_2O_3 achieves obvious improvements in the desulfurization performance, and H_2S and COS concentrations in exit gas are below 0.1 mgS/m~3 before breakthrough point as well as the accumulated breakthrough sulfur capacity reaches 14 wt.%. Adding Al_2O_3 can improve the pore structure of ZnO based desulfurization sorbent, which benefits H_2S to diffuse in the pore of sorbent and improves desulfurization performance. Loading K_2CO_3 can increase the basicity of ZnO based desulfurization sorbent, which raises the COS catalytic hydrolysis rate on sorbent and decreases concentration of COS present in exit gas.
机译：为了减少氧化锌基吸附剂对二氧化碳脱硫效率的不利影响，降低脱硫过程中废气中羰基硫的浓度，在制备氧化锌基脱硫吸附剂时必须对氧化锌基吸附剂进行改性。 。本文通过将活性氧化锌与石墨，Al_2O_3和K_2CO_3等不同添加剂混合，然后在环境温度下成型，在120℃下干燥并在550℃下煅烧得到改性的ZnO基脱硫吸附剂。在石英上流固定床反应器中，在300℃，2000 h〜（-1）和模拟煤衍生气条件下，对制备的ZnO基脱硫吸附剂的脱硫性能进行了测试。用X射线衍射仪对脱硫前后吸附剂的相进行表征，并用N_2吸附-解吸法测定其孔结构。实验结果表明，在实验条件下，ZnO基吸附剂的废气中存在COS，同时从模拟煤衍生的气体中去除了H_2S。 K_2CO_3和Al_2O_3组合改性的ZnO基脱硫吸附剂的脱硫性能有明显提高，出气前H_2S和COS浓度低于0.1 mgS / m〜3，突破点及累积突破硫容量达到14 wt％ 。％。添加Al_2O_3可以改善ZnO基脱硫吸附剂的孔结构，有利于H_2S在吸附剂孔中的扩散，提高脱硫性能。负载K_2CO_3可以提高ZnO基脱硫吸附剂的碱性，从而提高吸附剂上COS的催化水解速率，并降低出口气体中COS的浓度。

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  • 来源
    《Fuel》 |2013年第6期|80-84|共5页
  • 作者

    Ju Shangguan; Yousheng Zhao; Huiling Fan; Litong Liang; Fang Shen; Maoqian Miao;

  • 作者单位

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

    Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, Shanxi, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    desulfurization; zinc oxide sorbent; modification; hydrogen sulfide removal; carbonyl sulfide formation;

    机译：脱硫氧化锌吸附剂修改;硫化氢去除羰基硫的形成;

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