Porous α-Fe2O3 was synthesized by a simple hydrothermal treatment of FeCl3 aqueous solution followed by a calcination process. In the synthesis of porous α-Fe2O3, no templates or pore-directing agents were used. The...Porous α-Fe2O3 was synthesized by a simple hydrothermal treatment of FeCl3 aqueous solution followed by a calcination process. In the synthesis of porous α-Fe2O3, no templates or pore-directing agents were used. The as-prepared porous α-Fe2O3 was further employed as a support for loading Pt nanoparticles. The gas sensing performance of the obtained porous α-Fe2O3-supported Pt to VOCs was investigated. The sensor presented a high response and fast response-recovery characteristic to several VOCs including acetone, ether, methanol, ethanol, butanol and hexanol. Meanwhile, it exhibited a much higher response than the pure α-Fe2O3 at the operating temperature of 260°C. The enhanced sensing properties may be related to the unique porous structure of the α-Fe2O3 support and the promoting effect of active Pt nanoparticles for the sensing reactions.展开更多
分别通过自组装法(AS)和浸渍法(WI)制备得到纳米催化剂Pt/γ-Al2O3-AS和Pt/γ-Al2O3-WI,并用于评价甲苯、异丙醇、丙酮、乙酸乙酯等易挥发性有机物(VOCs)的氧化性能.通过各种表征手段探究了催化剂形态、结构及表面性质与催化剂氧化活性...分别通过自组装法(AS)和浸渍法(WI)制备得到纳米催化剂Pt/γ-Al2O3-AS和Pt/γ-Al2O3-WI,并用于评价甲苯、异丙醇、丙酮、乙酸乙酯等易挥发性有机物(VOCs)的氧化性能.通过各种表征手段探究了催化剂形态、结构及表面性质与催化剂氧化活性的关系.结果表明,Pt/γ-Al2O3-AS在低温下即可实现VOCs的完全氧化.在气体浓度(体积分数)为1000×10-6,空速为18000 m L·g-1·h-1的条件下,甲苯、异丙醇、丙酮、乙酸乙酯被Pt/γ-Al2O3-AS催化剂完全氧化的温度分别为130、135、145、215°C,展现出了优异的氧化性能,且具有很好的稳定性.该催化剂较高的比表面积、较小的Pt纳米粒径、较好的Pt纳米颗粒分散度、更好的低温还原效果及丰富的表面羟基是具有较高催化活性的重要因素.展开更多
基金supported by the National Natural Science Foundation of China (No. 20871071)the Science and Technology Commission Foundation of Tianjin (Nos. 09JCYBJC03600 and 10JCYBJC03900)
文摘Porous α-Fe2O3 was synthesized by a simple hydrothermal treatment of FeCl3 aqueous solution followed by a calcination process. In the synthesis of porous α-Fe2O3, no templates or pore-directing agents were used. The as-prepared porous α-Fe2O3 was further employed as a support for loading Pt nanoparticles. The gas sensing performance of the obtained porous α-Fe2O3-supported Pt to VOCs was investigated. The sensor presented a high response and fast response-recovery characteristic to several VOCs including acetone, ether, methanol, ethanol, butanol and hexanol. Meanwhile, it exhibited a much higher response than the pure α-Fe2O3 at the operating temperature of 260°C. The enhanced sensing properties may be related to the unique porous structure of the α-Fe2O3 support and the promoting effect of active Pt nanoparticles for the sensing reactions.
基金supported by the Key Innovation Team of Science&Technology in Zhejiang Province,China(2011R50017)National HighTechnology Research and Development Program of China(863)(2013AA065005)~~
文摘分别通过自组装法(AS)和浸渍法(WI)制备得到纳米催化剂Pt/γ-Al2O3-AS和Pt/γ-Al2O3-WI,并用于评价甲苯、异丙醇、丙酮、乙酸乙酯等易挥发性有机物(VOCs)的氧化性能.通过各种表征手段探究了催化剂形态、结构及表面性质与催化剂氧化活性的关系.结果表明,Pt/γ-Al2O3-AS在低温下即可实现VOCs的完全氧化.在气体浓度(体积分数)为1000×10-6,空速为18000 m L·g-1·h-1的条件下,甲苯、异丙醇、丙酮、乙酸乙酯被Pt/γ-Al2O3-AS催化剂完全氧化的温度分别为130、135、145、215°C,展现出了优异的氧化性能,且具有很好的稳定性.该催化剂较高的比表面积、较小的Pt纳米粒径、较好的Pt纳米颗粒分散度、更好的低温还原效果及丰富的表面羟基是具有较高催化活性的重要因素.
