郭家秀
,
梁娟
,
楚英豪
,
尹华强
,
陈耀强
催化学报
doi:10.3724/SP.J.1088.2010.90908
采用过量浸渍法制备了Ni/AC催化剂,考察了不同焙烧温度对Ni/AC脱硫活性的影响,并通过X射线衍射和X射线光电子能谱对催化剂进行了表征,研究了经不同温度焙烧后的催化剂上的Ni物种形态及其对催化剂性能的影响.结果表明,经400℃焙烧后的催化剂中Ni物种为Ni_2O_3,550℃焙烧后出现了NiO物种,800℃焙烧后Ni物种变为NiO和Ni共存,而1000℃焙烧后只存在单质Ni.这说明不同温度焙烧后的催化剂中Ni形成了不同的化学形态.脱硫活性的测试结果表明,经550℃和800℃焙烧后的催化剂表现出较好的脱硫活性.而400℃焙烧的催化剂脱硫活性最差.这说明Ni在催化剂上的不同化学形态是造成脱硫效果差异的主要原因,而NiO是Ni/AC催化剂脱硫的主要活性物相.
关键词:
镍
,
活性炭
,
负载型催化剂
,
化学形态
,
脱硫
,
氧化镍
荣雪荃
,
严继康
,
易健宏
,
杜景红
,
康昆勇
,
甘国友
人工晶体学报
采用溶胶-凝胶法制备纯TiO2粉末和5mol％ Ce掺杂TiO2粉末,利用X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)和紫外-可见分光光度计(UV-Vis)表征样品的相变过程和化学态变化,主要探讨了Ce掺杂对TiO2相变温度、物相组成、化学态及吸收光谱范围的影响.结果表明:掺杂Ce抑制了TiO2的相转变和晶粒长大.随着热处理温度升高,Ce掺杂TiO2的晶格氧峰增强而吸附氧峰降低,而且Ti2p3/2结合能减小,Ce3+逐渐被氧化为Ce4+.掺杂Ce拓宽了TiO2的可见光谱吸收范围.
关键词:
溶胶-凝胶法
,
二氧化钛
,
铈掺杂
,
化学态
By JIANG Honggang WANG Jingtang DING Bingzhe State Key Laboratory for RSA
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
ChinaTo whom correspondence should be addressed
材料科学技术（英）
The nature of the native oxides formed on the surface layer of amorphous alloy Ni_(64)P_(20)Fe_(16)has been studied by X-ray photoelectron spectroscopy (XPS)and Auger electron spectroscopy(AES)with depth profiling by ion bombardment.There are great distinctions in compositions and chemical states between the surface layer and the bulk.The main constituents Ni,P and Fe are lower in the sur- face layer,and they are mostly in oxidized states, whereas C,O and N are enriched in the surface lay- er.The thickness of surface oxide layer is approximately 20 nm,this layer was assumed to be of great significance to various properties of amor- phous alloy Ni_(64)P_(20)Fe_(16),expecially to the chemical and catalytic properties.Experiments proved that transitional element Fe cannot improve oxidation resistance of the amorphous Ni-P system.
关键词:
amorphous alloy Ni_(64)P_(20)Fe_(16)
,
null
,
null
