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

作　　者：Chao Yang Zhelin Su Yeshuang Wang Huiling Fan Meisheng Liang Zhaohui Chen 

机构地区：[1]College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China [3]State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第4期233-241,共9页中国化学工程学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(22078223 and 21878209);Shanxi Province Science Foundation for Youths(20210302123065)。

摘　　要：A series of ZnO/SiO_(2) adsorbents were prepared by a sol-gel method using tetraethyl orthosilicate,ethylene glycol(EG)and nitrates as precursors.The effect of gel drying temperature on the structure and desulfurization performance of the adsorbents were investigated in detail.It 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 process.The 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 nanoparticles.The 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 method.The adsorbent affords a highest sulfur capacity of 104.9 mg·g^(-1) in this case.In 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 

分 类 号：TQ546[化学工程—煤化学工程] TQ424