Y Zeolites Modified by Organosilane for Toluene Adsorption under High Humidity Condition  

作　　者：Boyu Zhang Kuo Zhang Ziqiang Duan Jianping Zhu Junan Gao Boyu Zhang;Kuo Zhang;Ziqiang Duan;Jianping Zhu;Junan Gao(State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China)

机构地区：[1]State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China

出　　处：《American Journal of Analytical Chemistry》2023年第10期451-466,共16页美国分析化学（英文）

摘　　要：Y zeolites have moderate microporous pore size, large specific surface area, and good hydrothermal stability, which were widely used in industrial adsorption of volatile organic compounds (VOCs), but the performance of Y zeolites in adsorption of VOCs under high humidity conditions is terrible. In this paper, Y zeolites with different silica-alumina ratios were hydrophobically modified by organosilane and characterized by XRD, FTIR, SEM, BET, NMR. In the experiments of static and dynamic adsorption of VOCs by modified Y zeolites, it can be concluded that the static water adsorption capacity of Y zeolites with silica-aluminum ratio of 5 and 40 after silica modification decreased by 62 wt% and 53 wt%, under the conditions of high humidity, GHSV = 15,000 h^-1, T = 35°C and initial concentration of toluene C₀ = 5000 mg·m^-3. The saturation adsorption capacity of toluene was increased from 0.06 g·g^-1, 0.09 g·g^-1 to 0.15 g·g^-1, 0.21 g·g^-1, the adsorption selectivity of Y zeolites for water was reduced and that for toluene was increased after Vapor phase silanization overlay modification. The present modification method might carry out targeted modification of zeolites surface, provide research ideas and guidance under high humidity conditions.Y zeolites have moderate microporous pore size, large specific surface area, and good hydrothermal stability, which were widely used in industrial adsorption of volatile organic compounds (VOCs), but the performance of Y zeolites in adsorption of VOCs under high humidity conditions is terrible. In this paper, Y zeolites with different silica-alumina ratios were hydrophobically modified by organosilane and characterized by XRD, FTIR, SEM, BET, NMR. In the experiments of static and dynamic adsorption of VOCs by modified Y zeolites, it can be concluded that the static water adsorption capacity of Y zeolites with silica-aluminum ratio of 5 and 40 after silica modification decreased by 62 wt% and 53 wt%, under the conditions of high humidity, GHSV = 15,000 h^-1, T = 35°C and initial concentration of toluene C₀ = 5000 mg·m^-3. The saturation adsorption capacity of toluene was increased from 0.06 g·g^-1, 0.09 g·g^-1 to 0.15 g·g^-1, 0.21 g·g^-1, the adsorption selectivity of Y zeolites for water was reduced and that for toluene was increased after Vapor phase silanization overlay modification. The present modification method might carry out targeted modification of zeolites surface, provide research ideas and guidance under high humidity conditions.

关 键 词：Y Zeolites Hydrophobic Modification Volatile Organic Compounds TOLUENE 

分 类 号：O64[理学—物理化学]