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题名: Enhanced performances in catalytic oxidation of o-xylene over hierarchical macro-/mesoporous silica-supported palladium catalysts
作者: Qiao, Nanli; Zhang Xin; He, Chi; Li, Yang; Zhang, Zhongshen; Cheng, Jie; Hao, Zhengping
刊名: FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
出版日期: 2016-06
卷号: 10, 期号:3, 页码:458-466
关键词: hierarchical macro-/mesoporous ; silica ; palladium ; VOCs catalytic oxidation
DOI: 10.1007/s11783-015-0802-1
部门归属: 城市与区域生态国家重点实验室
英文摘要: A series of hierarchical macro-/mesoporous silica supports (MMSs) were successfully synthesized using dual-templating technique employing polystyrene (PS) spheres and the Pluronic P123 surfactant. Pd was next loaded on the hierarchical silica supports via colloids precipitation method. Physicochemical properties of the synthesized samples were characterized by various techniques and all catalysts were tested for the total oxidation of o-xylene. Among them, the Pd/MMS-b catalyst with tetraethoxysilane/polystyrene weight ratio of 1.0 exhibited superior catalytic activity, and under a higher gas hourly space velocity (GHSV) of 70000 h(-1), the 90% conversion of o-xylene has been obtained at around 200 degrees C. The BET and SEM results indicated that Pd/MMSb catalyst possesses high surface area and large pore volume, and well-ordered, interconnected macropores and 2D hexagonally mesopores hybrid network. This novel ordered hierarchical porous structure was highly beneficial to the dispersion of active sites Pd nanoparticles with less aggregation, and facilitates diffusion of reactants and products. Furthermore, the Pd/MMS-b catalyst possessed good stability and durability.
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35579
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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