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倪可

作品数:2 被引量:2H指数:1
供职机构:安徽工业大学化学与化工学院更多>>
发文基金:国家自然科学基金更多>>
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高活性Pd-Fe催化剂对CO的低温氧化性能研究被引量:1
2018年
用共沉淀法制得Pd-Fe催化剂,考察了煅烧温度、载体、金属担载量对CO低温催化氧化反应活性的影响。结果表明,负载在炭黑上的Pd-Fe催化剂经200℃和300℃煅烧,性能最佳,在室温下可将CO完全转化。采用透射电镜(TEM)、X射线光电子能谱(XPS)、X射线粉末衍射(XRD)和CO化学吸附表征发现,催化剂的高活性是由于Pd与Fe之间具有强相互作用,导致Pd向界面Fe3+(Fe2O3)进行电子转移,形成还原态的Fex+物种。Pd O和还原态的Fex+物种分别是吸附CO和O2的活性中心,成为CO氧化高活性的主要原因。
范果红李龙倪可徐红
关键词:催化化学CO氧化活性位煅烧强相互作用
Comparative studies of leached Pt-Fe and Pt-Co catalysts for CO oxidation reactions被引量:1
2017年
Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid solution. Oxidation treatments of leached catalysts produced the structure o f metal oxides decorat-ing the surface of nanoparticles. The fully oxidized Fe2O3 and Co3O4 species on Pt nanoparticle sur-faces result in the low performance of the CO complete oxidation (COOX) reaction. In contrast, un-saturated FeO and CoO surface species can be formed during exposure to the CO preferential oxida-tion (CO-PROX) reaction with an excess of H2, leading to a high O2 activation ability and enhancing the CO-PROX activity. The FeOx surface structures can be transformed between these two states by varying the reactive gas environments, exhibiting oscillating activity in these two reactions. Con-versely, the CoO surface structure formed in the H2 -rich atmosphere is stable when exposed to the COOX reaction and exhibits similar activity in these two reactions. It is hoped that this work may assist in understanding the important role of surface oxides in real reactions.
徐红倪可李小昆朱胜范果红
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