【摘要】 从某S Zorb工业装置上采集了2个具有不同脱硫活性的工业吸附剂,采用XRD、碳硫分析和SEM表征其晶体结构、化学组成和形貌,采用高温原位XRD表征其在受热过程中晶体结构的变化规律,采用TG-MS和DTA表征其热分解过程和产物。结果表明,Zn2SiO4的形成显著影响了S Zorb吸附剂的化学组成、脱硫活性和稳定性、分解温度、质量损失。S Zorb吸附剂的热解包括5个阶段,分别为物理吸附水和吸附物的挥发、Ni物相的氧化、积炭的燃烧、ZnS热解和晶相转变。高温和酸性环境会导致进一步生成Zn2SiO4物相。最后详细阐述了S Zorb吸附剂的热解机理,以期为S Zorb工业生产和科研提供信息。更多还原

【Abstract】 Two sorbents with different desulfurization activities were collected from a S Zorb industrial unit.The crystal structure,chemical composition and morphology of the two sorbents were characterized by XRD,carbon-sulfur analysis and SEM.The changes of crystal structure of the sorbents were investigated by in situ HT-XRD during the heating process,and the thermal decomposition process and products of the sorbents were characterized by TG-MS and DTA analysis.According to the results,the formation of Zn2SiO4 phase deeply influenced the chemical composition,desulfurization activities and stability,decomposition temperature,and mass loss ratio of the sorbent.There are five decomposition steps of sorbent during the heating process,including the evaporation of physical adsorption water and absorptions,the oxidation of Ni phase,the combustion of coke,the thermal decomposing of ZnS,and the phase transformation.The higher temperature combined with the acidic environment promoted the formation of Zn2SiO4 phase in S Zorb sorbent.Finally,the thermal decomposition mechanism was described in detail.更多还原