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Insight into the effect of gel drying temperature on the structure and desulfurization performance of ZnO/SiO_(2)adsorbents

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Chinese Journal of Chemical Engineering 2023年第4期56卷 233-241页

作者： Chao Yang Zhelin Su Yeshuang Wang Huiling Fan Meisheng Liang Zhaohui Chen College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

A series of ZnO/SiO_(2) adsorbents were prepared by a sol-gel method using tetraethyl orthosilicate,ethylene glycol(EG)and nitrates as *** effect of gel drying temperature on the structure and desulfurization performance of the adsorbents were investigated in *** is found that the low drying temperature led to a weak interaction among EG,Si AOH/H_(2)O and the nitrates in the gel system,which caused the oxidation of EG by NO3-and formed zinc glyoxylate complex during the gel calcination process,whereas this oxidation process also occurred at a high drying temperature during the gel drying *** formed zinc glyoxylate complex promoted the generation of monodentate carbonate on the surface of Zn O,which resulted in the inferior desulfurization performance of adsorbents despite they have smaller Zn O *** gel dried at 120°C formed the hydrogen bonds between EG and Si AOH/H_(2)O and a strong interaction between zinc oxo-clusters and NO3-was also found in the gel system,which avoided the oxidation of EG by NO3-during the preparation process and the Zn O nanoparticles with sizes of 6 nm were formed by a combustion *** adsorbent affords a highest sulfur capacity of 104.9 mg·g^(-1) in this *** addition,the gel drying temperature has a significant influence on the textural properties of the adsorbents except their surface area.

关键词： Sol-gel method Drying temperature H_(2)S removal zinc-silica composites Hydrogen bonds

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