WANG Shuhe CHEN Xiuzhi WEN Lishi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China.
材料科学技术（英文）
Investigation by using LAS 3000 surface analysis system showed that the oxide of Fe, Cr,Al formed during oxidation were Cr_2O_3,Fe_2O_3 and Al_2O_3,but only small amount of nickel oxide was found. The composition of oxide layers for different oxidation durations varied in a similar way. In all cases,there exists an oxygen concentration peak in the composition profile of oxide layer. There is a transitional zone between oxide layer and alloy film.The thickness of oxide layer increases logarithmically with the time of oxida- tion.The ion plated Ni-Cr alloy film has very dense oxide layer and good oxidation resistance.
关键词:
ion plating
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null
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null
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null
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李洪芳
,
刘雪松
,
郭存霞
,
刘统
,
罗孟飞
,
鲁继青
催化学报
采用沉积.沉淀法和氨水络合法制备了Al_2O_3,TiO_2,CeO_2和SiO_2负载的纳米金催化剂,利用元素分析、x射线衍射、氮气物理吸附、程序升温还原、透射电镜和拉曼光谱等技术对催化剂进行了表征,并考察了其低温催化甲醛氧化活性.结果表明,Au/CeO_2的催化性能最佳,在40℃时甲醛转化率仍能保持在80%以上.催化剂的活性同时受Au的化学状态和载体性质的影响.Au/CeO_2催化剂较高的低温活性可能与离子态的Au物种有关,同时AuxCe_(1-x)O_(2-δ)固溶体的形成产生了大量的氧缺位,提高了氧的活化能力,也有助于提高催化剂的低温活性.
关键词:
金
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负载型催化剂
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甲醛
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低温氧化
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金.铈固溶体
