Au／Fe2O3／Al2O3催化剂上丙烯选择催化还原NO  

Selective Catalytic Reduction of NO with Propene over Au/Fe_2O_3/Al_2O_3 Catalysts

作　　者：王新葵[1] 张万生[2] 王爱琴[2] 王晓东[2] 杨学锋[1] 张涛[2] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,辽宁大连116012 [2]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2008年第6期503-505,共3页

基　　金：大连理工大学青年教师培养基金

摘　　要：以浸渍法制备的Fe2O3/γ-Al2O3为载体,采用均相沉积沉淀方法制备了Au/Fe2O3/Al2O3催化剂.该催化剂在丙烯选择催化还原NO反应中显示出很好的低温催化活性,300℃时NO被选择还原为N2的转化率可达43%,而在Au/Al2O3催化剂上,NO的转化率仅为21%.水蒸气的加入对催化剂活性的影响较小.X射线衍射结果表明,Au和Fe2O3高度分散在Al2O3载体上.吸附氢气的程序升温还原结果表明,Au与Fe2O3之间存在着强相互作用,Au的存在促进了Fe2O3的还原,Au和Fe2O3之间的协同作用可能是Au/Fe2O3/Al2O3催化剂在丙烯选择还原NO反应中具有较高低温催化活性的原因之一.A series of Au/Fe2O3/Al2O3 catalysts were prepared by the homogeneous deposition-precipitation method. The catalytic activity of the catalyst samples for selective catalytic reduction of NO by propene under oxygen-rich atmosphere was evaluated. The results showed that 2 % Au/10 % Fe2O3/Al2O3 exhibited good low- temperature activity. The maximum of NO conversion reached 43% at 300℃ , while it was only 21% over 2% Au/Al2O3 catalyst at the same temperature. The addition of 2% steam to the feed gas had little effect on the catalytic activity. X-ray diffraction results indicated that both Au and Fe203 particles were highly dispersed over Al2O3. H2-temperature-programmed reduction results indicated that there was strong interaction between Au and Fe2O3, which made the reduction of Fe2O3 easy. The synergistic effect between Au and Fe2O3 was probably responsible for the good catalytic performance of the Au/Fe2O3/Al2O3 catalyst at low temperature.

关 键 词：金纳米粒子 三氧化二铁 选择性催化还原 氮氧化物 丙烯 

分 类 号：O643[理学—物理化学]