| Pt负载钙钛石催化剂上氧空位对CO氧化的促进作用 | |
| Action of Oxygen Vacancy in CO Catalytic Oxidation over Pt Supported Pervoshkite Oxides | |
| 摘要: 采用柠檬酸法制备了LaMnO3、LaFeO3、La0.5Sr0.5MnO3、La0.5Sr0.5FeO3, 通过负载纳米Pt合成了Pt负载钙钛石催化剂, XRD与IR数据表明合成的催化剂具有钙钛石相, TEM数据表明合成的纳米Pt粒径为~3 nm, 均匀分散在钙钛石上。在CO氧化反应中, 发现钙钛石的氧化-还原性能是影响其活性的重要因素, 因而, Mn系钙钛石表现出较高的CO氧化活性。负载纳米Pt后, Fe系钙钛石则显示出更优异的CO氧化活性, CO完全转化的温度从350 ℃降至120 ℃。吸附实验表明钙钛石上氧空位对促进O2的吸附起着非常重要的作用, 也是影响CO低温氧化的重要因素之一。 | |
| 关键词: 钙钛石 纳米Pt 氧化-还原 氧吸附 | |
| 基金项目: 国家自然科学基金(No.21273221)资助项目。 | |
| Abstract: LaMnO3, LaFeO3, La0.5Sr0.5MnO3, La0.5Sr0.5FeO3 were prepared by citric acid method and Pt/LaMnO3, Pt/LaFeO3, Pt/La0.5Sr0.5MnO3, Pt/La0.5Sr0.5FeO3 were prepared by impregnating nano-Pt solution to ABO3 mixed oxides. It showed that prepared ABO3 mixed oxides possessed pervoskite structrue from XRD and IR data, the size of nano-Pt particle was about ~3 nm and dispersed uniformly on ABO3 mixed oxides from TEM. It was found that the redox properties determined the catalytic properties of ABO3-type catalsysts in CO catalytic oxidation, thus, Mn-ABO3 catalsysts gave the better activity in CO catalytic oxidation. When supported nano-Pt paricle to ABO3- mixed oxides, Pt/Fe-ABO3 catalsysts showed the excellent activity, the reaction temperature of 100% CO conversion was reduced from 350 ℃ to 120 ℃. Adsorption experiment indicated that oxygen vacancy on ABO3 mixed oxides was a key factor to improve the adsorption of oxygen and to determine the properties of CO oxidation at lower reaction temperatures. | |
| Keywords: perovskite nano-Pt particle redox O2 adsorption | |
| 投稿时间：2015-01-05 修订日期：2015-04-22 | |
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| 孔令智,王谦,徐丽,闫永胜,李华明,杨向光.Pt负载钙钛石催化剂上氧空位对CO氧化的促进作用[J].无机化学学报,2015,31(7):1335-1341. | |
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