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Study on the deactivation of the deoxygen catalyst during the landfill gas upgrading process

机译：垃圾填埋气改质过程中脱氧催化剂失活的研究

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摘要

Landfill gas (LFG) could be upgraded to bio-methane when CO_2 and other harmful minor components are removed. Catalytic oxidation of CH_4 is an effective deoxygen method for upgrading LFG as an alternative for natural gas or a vehicle fuel to meet the requirement of O_2 content limitation. The durability of the deoxygen catalyst is an important factor that needs to be studied before it is put into practical application. To investigate the catalyst durability and the causes that lead to the deactivation of the catalysts, two catalysts of Pt/γ-Al_2O_3 coated on the metallic substrate were prepared and used for LFG deoxygen process under the conditions of the gas hourly space velocity of 20,000 h~(-1) and inlet temperature around 300 ℃ until deactivation. The deoxygen conversions of the catalysts were measured at different stages of use, and the fresh and spent catalysts were characterized and compared by various techniques. The results demonstrated that the catalysts prepared in this study showed excellent deoxygen performances while deactivation of them took place gradually. The lifetimes of the two catalysts were 724 and 508 h respectively under the experimental condition in this study. The carbon, silicate, sulfate and elementary sulfur deposited on the active sites of the catalysts could be the causes of the deactivation. The catalytic performances of the spent catalysts could be regenerated through the removal of carbon deposit by heat treatment under air atmosphere. The accumulation of silicate and sulfate deposits, which are generated from the oxidation of siloxanes and hydrogen sulfide in LFG, could lead to permanent catalyst deactivation.
机译：去除CO_2和其他有害的次要成分后，垃圾填埋气（LFG）可以升级为生物甲烷。 CH_4的催化氧化是一种有效的脱氧方法，可提高LFG的水平，以替代天然气或车辆燃料以满足O_2含量限制的要求。脱氧催化剂的耐久性是在投入实际应用之前需要研究的重要因素。为了研究催化剂的耐久性以及导致催化剂失活的原因，制备了两种涂覆在金属基底上的Pt /γ-Al_2O_3催化剂，并在气体时空速度为20,000 h的条件下用于LFG脱氧工艺。 〜（-1），入口温度约为300℃，直到停用。在使用的不同阶段测量了催化剂的脱氧转化率，并通过各种技术对新鲜和用过的催化剂进行了表征和比较。结果表明，在该研究中制备的催化剂表现出优异的脱氧性能，同时它们逐渐失活。在本研究的实验条件下，两种催化剂的寿命分别为724和508 h。沉积在催化剂活性部位的碳，硅酸盐，硫酸盐和元素硫可能是导致失活的原因。废催化剂的催化性能可以通过在空气气氛下通过热处理除去积碳来再生。 LFG中硅氧烷和硫化氢的氧化产生的硅酸盐和硫酸盐沉积物的积累，可能导致催化剂永久失活。

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  • 来源
    《Fuel》 |2015年第15期|43-49|共7页
  • 作者

    Huijuan Gong; Zezhi Chen; Mengqun Zhang; Weili Wu; Weixing Wang; Weibing Wang;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, PR China,Center of Materials Analysis, Nanjing University, Nanjing 210093, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, PR China,School of the Environment, Nanjing University, Nanjing 210023, PR China,Jiangsu Engineering Center for Biomass Energy and Low Carbon Technology, Nanjing 210023, PR China;

    Center of Materials Analysis, Nanjing University, Nanjing 210093, PR China;

    Jiangsu Engineering Center for Biomass Energy and Low Carbon Technology, Nanjing 210023, PR China;

    Jiangsu Engineering Center for Biomass Energy and Low Carbon Technology, Nanjing 210023, PR China;

    Jiangsu Engineering Center for Biomass Energy and Low Carbon Technology, Nanjing 210023, PR 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

    Landfill gas upgrading; Catalytic deoxygen; Catalyst deactivation; Characterization;

    机译：垃圾填埋气升级;催化脱氧催化剂失活;表征;

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