title: Preparation of ZnO/SiO2 gel composites and their performance of H2S removal at room temperature.
abstract: ZnO/SiO(2) gel composites with different active component loading were prepared by sol-gel method combined with ambient drying process, followed by thermal treatment. The gel composites were characterized by scanning electron microscopy (SEM), nitrogen adsorption, X-ray diffraction (XRD), FTIR and X-ray photoelectron spectroscopy (XPS), and their performances for H(2)S removal were evaluated by dynamic testing at room temperature. The as prepared materials exhibited high surface area with multimodal pore size distributions in micropore and mesopore region. The porous properties were significantly influenced both by the ZnO loading ratio and the treated temperature. The gel composites showed a high performance for H(2)S removal, with the highest H(2)S adsorption capacity of 96.4mg/g for the sample treated at 400°C with 30wt% ZnO. Both physisorption and the active phase reactivation governed the H(2)S removal process. It needs to optimize the composites' porous structure and active component loading amount.
authors.affiliation: Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Liu
authors.forename: Zheng-Hong
authors.initials: ZH
authors.lastname: Huang
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
mesh_terms: D000327:Adsorption; D006862:Hydrogen Sulfide / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry*; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D058428:Silica Gel; D015034:Zinc Oxide; D006862:Hydrogen Sulfide