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基于TiO_2-Y_2O_3粉体催化发光甲醇气体传感器的研究 认领 引用 被引量：11
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作者 饶志明 谢静宜 +2 位作者 刘林洁 曾玉云 蔡文联 《化学学报》 SCIE CAS 北大核心 2007年第6期532-536,共5页
发现当甲醇气体通过TiO2-Y2O3(质量比为3∶1)粉体表面时,可被空气中的O2催化氧化产生强烈的化学发光,基于此研制了一种新型的甲醇气体传感器.此传感器对甲醇的检测具有较高灵敏度和较强的选择性.在波长490nm处进行定量分析,催化发光强... 发现当甲醇气体通过TiO2-Y2O3(质量比为3∶1)粉体表面时,可被空气中的O2催化氧化产生强烈的化学发光,基于此研制了一种新型的甲醇气体传感器.此传感器对甲醇的检测具有较高灵敏度和较强的选择性.在波长490nm处进行定量分析,催化发光强度与甲醇浓度在一定范围内呈良好的线性关系,其线性范围为25.74～12870mg/m3(r=0.9995,n=8);检出限为8.58mg/m3(信噪比=3).外来物质如正己烷、三氯甲烷、苯、无水乙醇、甲醛、丙酮、氨、甲苯与甲醇共存时,除了丙酮、乙醇和氨分别引起干扰外,苯与其它气体不干扰测定.该传感器工作时间可持续80h以上,是一种长寿命的、性能稳定的气体传感器,并成功地实现了对甲醇气体的实时在线检测. 展开更多
关键词 催化发光 甲醇 气体传感器 TiO2-Y2O3粉体
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复合TiO_2-Y_2O_3催化发光环氧丙烷气体传感器 认领 引用 被引量：7
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作者 李铭 陈景业 +1 位作者 胡玉斐 李攻科 《分析化学》 SCIE EI CAS CSCD 北大核心 2019年第2期191-197,共7页
制备了TiO_2-Y_2O_3纳米复合材料,并研究了环氧丙烷在其表面产生的催化发光现象,基于此,研制了环氧丙烷催化发光传感器。此传感器对丙酮、乙醛、苯等常见的挥发性有机物没有响应,显示出良好的选择性。对复合物的不同氧化物比例及烧结温... 制备了TiO_2-Y_2O_3纳米复合材料,并研究了环氧丙烷在其表面产生的催化发光现象,基于此,研制了环氧丙烷催化发光传感器。此传感器对丙酮、乙醛、苯等常见的挥发性有机物没有响应,显示出良好的选择性。对复合物的不同氧化物比例及烧结温度进行优化,得到TiO_2与Y_2O_3质量比为1∶3、烧结温度为500℃时,催化材料性能最佳。在最优实验条件下,即197℃、波长490 nm及载气流速0.3 L/min时,催化化学发光强度与环氧丙烷浓度在4.5～1375 mg/L范围内呈现良好的线性关系,检出限(3σ)为1.25 mg/L。此传感器具有灵敏快速、操作简便等优点,采用此传感器实时监测熏蒸谷物中环氧丙烷残留量,结果与气相色谱法吻合,相对偏差为2.7%～4.9%,显示出此传感器良好的性能。对环氧丙烷催化氧化的机理进行了初步探讨。 展开更多
关键词 纳米TiO2-Y2O3 环氧丙烷 催化发光 气体传感器
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MgO-Al_2O_3-SiO_2-TiO_2-Y_2O_3玻璃的弹性模量 认领 引用 被引量：7
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作者 迟玉山 沈菊云 +1 位作者 陈学贤 缪之训 《无机材料学报》 SCIE EI CAS 北大核心 2002年第3期475-479,共5页
根据硬盘基板用材料的要求,制备了MgO－Al2O3－SiO2－TiO2－Y2O3高弹性模量玻璃(120GPa)玻璃的弹性模量随组成的变化服从Makishima－Mackenzie理论,MgO、Al2O3、TiO2、Y2O3等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量．... 根据硬盘基板用材料的要求,制备了MgO－Al2O3－SiO2－TiO2－Y2O3高弹性模量玻璃(120GPa)玻璃的弹性模量随组成的变化服从Makishima－Mackenzie理论,MgO、Al2O3、TiO2、Y2O3等具有较高单位体积离解能的氧化物有利于提高玻璃的弹性模量．但玻璃弹性模量的理论计算值低于测试值．这是因为Makishima－Mackenzie理论没有考虑玻璃内阳离子的具体配位状态,对MgO、Y2O3堆积密度因子的推导存在误差．因此利用Makishima－Mackenzie理论发展高弹性模量玻璃时应对MgO、Y2O3等氧化物的计算进行修正． 展开更多
关键词 MgO-Al2O3-SiO2-TiO2-Y2O3玻璃 弹性模量 Makishima-Mackenzie理论 硬盘基板
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Preparation of α-Bi_2O_3 from bismuth powders through low-temperature oxidation 认领 引用 被引量：5
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作者 夏纪勇 唐谟堂 +2 位作者 陈萃 金胜明 陈永明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第9期2289-2294,共6页
α-Bi2O3 powders were prepared from nanometer Bi powders through low-temperature oxidation at less than 873.15 K. XRD, SEM, TEM and HRTEM were used to characterize the structure and morphology of Bi powders and Bi2O3 ... α-Bi2O3 powders were prepared from nanometer Bi powders through low-temperature oxidation at less than 873.15 K. XRD, SEM, TEM and HRTEM were used to characterize the structure and morphology of Bi powders and Bi2O3 particles. Kinetic studies on the bismuth oxidation at low-temperatures were carried out by TGA method. The results show that bismuth beads should be reunited and oxidized to become irregular Bi2O3 powders. The bismuth oxidation follows shrinking core model, and its controlling mechanism varies at different reaction time. Within 0-10 min, the kinetics is controlled by chemical reaction, after that it is controlled by O2 diffusion in the solid α-Bi2O3 layer. The apparent activation energy is determined as 55.19 kJ/mol in liquid-phase oxidation. 展开更多
关键词 bismuth powder low-temperature oxidation α-Bi2O3 oxidation kinetics
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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 认领 引用 被引量：4
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作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 Al-12Si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating
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Preparation and sintering of nanometer W-2 wt.% Y_2O_3 composite powders 认领 引用 被引量：3
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作者 李长记 刘实 +1 位作者 熊良银 王文涛 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期752-757,共6页
W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying （MA） and spark plasma sintering （SPS）. The relevant productions were characteriz... W-2 wt.%Y2O3 composite material with uniform distribution of yttrium element was fabricated through processes of mechanical alloying （MA） and spark plasma sintering （SPS）. The relevant productions were characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The XRD showed that the W-2 wt.%Y2O3 composite powder, including tungsten matrix and Y2O3 particles, was refined to nanometer sizes during the MA process. The SEM and TEM micrographs showed that the MA produced composite powder presented a lamellar morphology and contained many dislocations and microcracks. The EDS showed that the Y and O elements were uniformly distributed in the W matrix after mechanically alloying for 15 h. The W-2 wt.%Y2O3 composite material with uniform distribution of yttrium was obtained by sintering of the MA produced composite powder. 展开更多
关键词 W-2 wt.%Y2O3 composite material lamellar nanometer powder uniform distribution of Y MA SPS rare earths
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Concentration and annealing effect on PL properties of sol-gel derived SiO_2-Y_2O_3:Eu3+ nanocomposites 认领 引用 被引量：2
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作者 王忆 曾庆光 +3 位作者 胡社军 吴坤彬 蒋俊宏 陈根廷 《Journal of Rare Earths》 SCIE EI CAS 2010年第2期176-180,共5页
An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples... An improved sol-gel method was employed to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites.Systematic study was carried out on the effect of post-annealing treatment on photoluminescence(PL) properties of the samples under various europium ions doping concentrations.X-ray diffraction(XRD) patterns indicated that the samples showed an amorphous matrix structure,and the scanning electron microscopy(SEM) pictures showed that the samples presented a nano size(from 21 to 42 nm) granular-stack structure after hi... 展开更多
关键词 Eu3+doped SiO2-Y2O3 glass photoluminescence（PL） nanocomposites rare earths
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Hot deformation and processing maps of Al_2O_3/Al composites fabricated by flake powder metallurgy 认领 引用 被引量：2
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作者 栾佰峰 邱日盛 +4 位作者 李春红 杨晓芳 李志强 张荻 刘庆 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第4期1056-1063,共8页
The deformation behaviors of Al2O3/Al composites were investigated by compressive tests conducted at temperature of 300-450 °C and strain rates of 0.001-1.0 s-1 with Gleeble-1500 D thermal simulator system. The r... The deformation behaviors of Al2O3/Al composites were investigated by compressive tests conducted at temperature of 300-450 °C and strain rates of 0.001-1.0 s-1 with Gleeble-1500 D thermal simulator system. The results show that the flow stress increases with increasing strain rate and decreasing temperature. The hyperbolic sine constitutive equation can describe the flow stress behavior of Al2O3/Al composites, and the deformation activation energy and constitutive equations were calculated. The processing maps of Al2O3/Al-2 μm and Al2O3/Al-1 μm composites at strain of 0.6 were obtained and the optimum processing domains are in ranges of 300-330 °C, 0.007-0.03 s-1 and 335-360 °C, 0.015-0.06 s-1 for hot working, respectively. The instability zones of flow behavior can also be recognized by the maps. 展开更多
关键词 Al2O3/Al composites flake powder metallurgy flow stress processing map
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Synthesis of ZrO_2-HfO_2-Y_2O_3-Sc_2O_3 Nano-Particles by Sol-Gel Technique in Aqueous Solution of Alcohol 认领 引用 被引量：1
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作者 甄强 陈瑞芳 +1 位作者 严凯 李榕 《Journal of Rare Earths》 SCIE EI CAS 2007年第2期199-203,共5页
Agglomeration-free nanosized ZrO2-HfO2-Y2O3-Sc2O3 composite powders were successfully synthesized by Sol-Gel technique in heated aqueous solution of alcohol, using analytically pure ZrOCl2 · 8H2O, HfOCl2·8H2... Agglomeration-free nanosized ZrO2-HfO2-Y2O3-Sc2O3 composite powders were successfully synthesized by Sol-Gel technique in heated aqueous solution of alcohol, using analytically pure ZrOCl2 · 8H2O, HfOCl2·8H2O, Y（NO3）3·6H2O, and Sc2O3 as raw materials. The effect of synthesis condition on the size and dispersity of the composite powders was investigated by means of XRD, TEM, and TG-DSC techniques. The results showed that well-dispersed predecessor of ZrO2-HfO2-Y2O3-Sc2O3 composite nanopowders could be obtained. The optional condition ： PEG6000 as dispersant was 1%, alcohol/H2O ratio was 5/1, metallic ion concentration in whole solution was 0.5 mol·L^-1 and the pH value of the solution was 12. After calcined at 620 ℃, the powder obtained was in uniform cubic structure, and its average particle size was about 13 nm, which was good for producing nanocrystalline solid electrolyte. 展开更多
关键词 ZrO2-HfO2-Y2O3-Sc2O3 composite nanopowders sol-gel aqueous solution of alcohol dispersibility rare earths
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(1-y)Ca1-xLa2x/3TiO_3-yCa(Mg1/3 Nb2/3)O_3系陶瓷的缺位结构与微波介电性能研究 认领 引用 被引量：2
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作者 王浩 陈文 刘涛 《材料科学与工程学报》 CAS 北大核心 2004年第4期515-518,共4页
采用固相合成法制备了 (1-y)Ca1 -xLa2x 3TiO3-yCa(Mg1 3Nb2 3)O3系列固溶体陶瓷材料 ,研究了该体系微波介电性能与微观结构的关系。研究结果表明 :当体系组成为 0 .5Ca0 .6 La0 .2 6 7TiO3 0 .5Ca(Mg1 3Nb2 3)O3时 ,在 14 0 0°C... 采用固相合成法制备了 (1-y)Ca1 -xLa2x 3TiO3-yCa(Mg1 3Nb2 3)O3系列固溶体陶瓷材料 ,研究了该体系微波介电性能与微观结构的关系。研究结果表明 :当体系组成为 0 .5Ca0 .6 La0 .2 6 7TiO3 0 .5Ca(Mg1 3Nb2 3)O3时 ,在 14 0 0°C下烧结保温 4小时所得到材料的微波介电性能最佳 :εr=5 5 ,Q×f值 =4 5 0 0 0GHz(7.6GHz下 ) ,τf=0 .0 4× 10 - 6 °C。同时还探讨了三价阳离子La3+ 固溶时产生的A点缺陷VCa2 + 对固溶体结构及微波介电性能的影响。 展开更多
关键词 固相合成法 微波介质陶瓷 复合钙钛矿 介电性能 A位点缺陷 (1-Y)Ca1-xLa2x/3TiO3-YCa(Mg1/3Nb2/3)O3系陶瓷
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Effect of anions on preparation of ultrafine α-Al_2O_3 powder 认领 引用 被引量：2
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作者 肖劲 秦琪 +4 位作者 万烨 周峰 陈燕彬 李劼 刘业翔 《Journal of Central South University of Technology》 2007年第6期773-778,共6页
Ultrafine alumina power was obtained by calcining the precursor at 1 200 ℃ for 2 h, which was prepared by homogeneous precipitation method using aluminium salts and urea as raw materials. The effects of anions on the... Ultrafine alumina power was obtained by calcining the precursor at 1 200 ℃ for 2 h, which was prepared by homogeneous precipitation method using aluminium salts and urea as raw materials. The effects of anions on the morphology, particle size, surface area and configuration of the precursors were studied. The results show that the reactions of urea with aluminium nitrate and aluminium chloride result in agglomerates gels with bad filtering performance, the morphology is fibrillar. Aluminium sulphate-urea reactions result in the direct formation of amorphous powders with good filtering performance, of which morphology are regular spherical particles with larger granularity and smaller surface area. The reaction of mutual compound of aluminium sulphate and aluminium nitrate with molar ratio of 40:60 with urea can produce precursor with good filtering performance, spherical morphology, and uniform granularity distribution in the particle size range of 2-3 μm. 展开更多
关键词 α-Al2O3 ultrafine powder homogeneous precipitation anion mutual compound
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Transition of Y_2BaCuO_5 Phase in Powder Melting Processed YBa_2Cu_3O7-xSuperconductors 认领 引用
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作者 FENG Jianqing LU Yafeng +6 位作者 XU Xiaoyan XIONG Xiaomei LIU Guoqing ZHANG Cuiping CHEN Shaokai ZHANG Pingxiang ZHOU Lian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第4期620-623,共4页
The morphology and the formation of Y2BaCuO5 phase in powder melting processed YBa2Cu3O7-x superconductors were investigated.The experimental results show the heat treatment can not change the shape of Y2BaCuO5 partic... The morphology and the formation of Y2BaCuO5 phase in powder melting processed YBa2Cu3O7-x superconductors were investigated.The experimental results show the heat treatment can not change the shape of Y2BaCuO5 particles in powder melting processed samples.The formation of round Y2BaCuO5 phase is due to relative content of each constitution of precursor powders in powder melting process.For powder melting process,the excessive liquid phase is eliminated,which restrains the preferred growth of Y2BaCuO5 particles. 展开更多
关键词 morphology powder melting process YBa2Cu3O7-x scanning electron microscopy
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In-situ Preparation of Al/TiAl_3(P) Composite by Direct Reaction between Molten Al and TiO_2 Powder 认领 引用
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作者 Yuyong CHEN Ziyong CHEN Qu SHU and Geying AN 《Journal of Materials Science & Technology》 SCIE EI CAS 1998年第6期569-570,共2页
TiAl3 particle reinforced pure Al composite has been made by direct reaction among molten Al, TiO2 and a flux. The composite exhibits high Synthetically properties. The strength and hardness are higher than those of p... TiAl3 particle reinforced pure Al composite has been made by direct reaction among molten Al, TiO2 and a flux. The composite exhibits high Synthetically properties. The strength and hardness are higher than those of pure Al matrix by 71.5% and 134% respectively However, the elongation is 20.36%, slightly lower than that of the Al matrix. 展开更多
关键词 TiO TiAl In-situ Preparation of Al/TiAl3 Composite by Direct Reaction between Molten Al and TiO2 Powder
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Si3N4/Si2N2O复相粉体对Al2O3-SiC-C浇注料性能的影响 认领 引用
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作者 李有奇 何健 +2 位作者 陈俊峰 张嘉良 李正坤 《耐火材料》 CAS 北大核心 2025年第1期1-7,共7页
为了提高Al2O3-SiC-C浇注料的综合服役性能,采用化学燃烧法合成的微晶氮化硅/氮氧化硅(Si3N4/Si2N2O)复相粉体为添加物,以棕刚玉、板状刚玉、碳化硅、活性α-Al2O3微粉、SiO2微粉、纯铝酸钙水泥、单质Si粉... 为了提高Al2O3-SiC-C浇注料的综合服役性能,采用化学燃烧法合成的微晶氮化硅/氮氧化硅(Si3N4/Si2N2O)复相粉体为添加物,以棕刚玉、板状刚玉、碳化硅、活性α-Al2O3微粉、SiO2微粉、纯铝酸钙水泥、单质Si粉和球沥青为原料,制备了Al2O3-SiC-C浇注料。研究了复相粉体外加量(外加质量分数分别为0、1%、2%、3%和5%)对浇注料性能的影响,同时探究Si3N4/Si2N2O增强试样综合性能的作用机制。结果表明:1)Si3N4/Si2N2O复相粉可以显著改善Al2O3-SiC-C浇注料的力学性能、抗氧化性能和抗热震性;2)Si3N4/Si2N2O复相粉通过填充孔隙、促进烧结反应进行、生成晶须状物质等途径优化了浇注料的显微结构,提高了浇注料的综合性能;3)当Si3N4/Si2N2O复相粉外加量为3%(w)时,浇注料的性能最佳。 展开更多
关键词 Si3N4/Si2N2O复相粉 Al2O3-SiC-C浇注料 抗氧化性 抗热震性
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PREPARATION OF NANOMETER ZrO_2-8% Y_2O_3 POWDERS BY AZEOTROPIC DISTILLATION PROCESSING 认领 引用 被引量：2
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作者 Yin, Bangyao Wang, Lingsen +3 位作者 Zhang, Jinshen Huan, Yi Yang, Yong Ling, Jianliang 《中国有色金属学会会刊：英文版》 1999年第1期46-49,共4页
1INTRODUCTIONItiswelknownthatsinteringtemperaturewilbegreatlydecreasedduetopreparationofultrafineandhomogeneouspowders．Asare...
关键词 ZrO 2 8%Y 2O 3 nanometer powder chemical coprecipitation method azeotropic distillation hard agglomerate
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Kinetics of Reduction of Iron Oxide in CaO-SiO_2-Al_2O_3-Fe_tO Slags with Graphite Powder 认领 引用
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作者 Yang Xuemin Huang Dianbing +3 位作者 Kong Lingtan Yang Tianjun Xie Yusheng Wang Daguang 《Journal of Iron and Steel Research International》 SCIE CAS 1998年第1期21-27,共7页
The reduction rate of Fe^tO in CaOSiO_2Al_2O_3Fe_tO slags with graphite powder has been determined in an alumina crucible at 1 673-1 823 K. The effects of temperature, slag basicity and Fe_tO content on th... The reduction rate of Fe^tO in CaOSiO_2Al_2O_3Fe_tO slags with graphite powder has been determined in an alumina crucible at 1 673-1 823 K. The effects of temperature, slag basicity and Fe_tO content on the reduction rate have also been discussed. Test results show that the reduction rate increases with the increase of temperature or Fe_tO concentration in slags, and the reduction rate has a parabolic relation with slag simple basicity or optical basicity. The maximum reduction rate is observed around CaO/SiO_2=1.5 of molten slags. The reaction order is 1.26 or 1.31, and the reduction activation energy is 126.8 or 129.7 kJ/mol respectively in regard to Fe_tO content or Fe_tO activity calculated by using regular solution model. The reduction rate of Fe_tO in CaOSiO_2Al_2O_3Fe_tO slags with graphite powder is in the range of 0.15×10^-4-0.86×10^-4 molO/cm^2·s. 展开更多
关键词 CaOSiO_2Al_2O_3Fe_tO slags,reduction rate graphite powder Fe^tO activity kinetics
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Effects of Nano-Y_2O_3 and Sintering Parameters on the Fabrication of PM Duplex and Ferritic Stainless Steels 认领 引用
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作者 R.Shashanka D.Chaira 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2016年第1期58-71,共14页
Here we report the effects of nano-Y203 addition, sintering atmosphere and time during on the fabrication of PM duplex and ferritic stainless steels composites by dual-drive planetary milling of elemental Fe, Cr and N... Here we report the effects of nano-Y203 addition, sintering atmosphere and time during on the fabrication of PM duplex and ferritic stainless steels composites by dual-drive planetary milling of elemental Fe, Cr and Ni powders followed by conventional pressureless sintering. Yttria-free and yttria-dispersed duplex and ferritic stainless steels are fabricated by conventional sintering at 1000, 1200 and 1400 ℃ temperatures under argon atmosphere. In another set of experiment, yttria-free and yttria-dispersed duplex and ferritic stainless steels are consolidated at 1000 ℃ for l h under nitrogen atmosphere to study the effect of sintering atmosphere. It has been found that densities of duplex and yttria- dispersed duplex stainless steel increase from 71% to 91% and 78% to 94%, respectively, with the increase in sintering temperature. Similarly, hardness value increases from 257 to 567 HV25 in case of duplex, and from 332 to 576 HV25 in yttria-dispersed duplex stainless steel. X-ray diffraction analysis shows the domination of more intense austenite phase than ferrite at higher sintering temperature and also in nitrogen atmosphere. It is also evident that addition of yttria enhances phase transformation from a-Fe to 7-Fe. Duplex and yttria-dispersed duplex stainless steels exhibit the maximum com- pressive yield strength of 360 and 312 MPa, respectively. 展开更多
关键词 Nano-Y2O3 Composites Stainless steel Powder metallurgy （PM） Mechanical properties Microstructure Phase transitions
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K2O对V2O5-WO3/TiO2催化剂的中毒作用 认领 引用 被引量：33
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作者 朱崇兵 金保升 +3 位作者 仲兆平 李锋 陈玲霞 翟俊霞 《东南大学学报（自然科学版）》 EI CAS 北大核心 2008年第1期101-105,共5页
实验室制备了V2O5-WO3/TiO2的脱硝催化剂,采用模拟中毒法,在此催化剂上负载碱金属氧化物K2O,通过BET,XRD,SEM等方法对微观结构进行表征.在SCR活性试验台上研究不同含量K2O对催化剂脱硝活性,N2O生成率和SO2氧化率的影响.结果发现:K2O对... 实验室制备了V2O5-WO3/TiO2的脱硝催化剂,采用模拟中毒法,在此催化剂上负载碱金属氧化物K2O,通过BET,XRD,SEM等方法对微观结构进行表征.在SCR活性试验台上研究不同含量K2O对催化剂脱硝活性,N2O生成率和SO2氧化率的影响.结果发现:K2O对于催化剂的毒性较强,随着添加量的增大,NO脱除率急剧下降,SO2的氧化率大大提高;较大含量的K2O(nKV=1,摩尔比)使催化剂比表面积有所减少,催化剂颗粒发生轻微团聚,微观结构变化不大,但NO的脱除率小于50%(380℃),N2O的生成率和SO2的氧化率均增加;K2O通过与V2O5的活性酸性位结合,使催化剂中有效活性位数量大为降低,导致脱硝活性下降. 展开更多
关键词 中毒 K2O V2O5-WO3/TiO2催化剂 SCR 脱硝
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磁性纳米TiO_2/SiO_2/Fe_3O_4光催化剂的制备及表征 认领 引用 被引量：43
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作者 廖振华 陈建军 +2 位作者 姚可夫 赵方辉 李荣先 《无机材料学报》 SCIE EI CAS 北大核心 2004年第4期749-754,共6页
以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样... 以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样品为双层包覆型结构,SiO2为中间层,最外层是锐钛矿型的TiO2。该复合光催化剂对甲基橙溶液有较高的光催化活性,并具有可利用其磁性回收重用的特点,应用前景广泛。 展开更多
关键词 TiO2/SiO2/Fe3O4 包覆 磁性 光催化
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TiO_2和α-Al_2O_3晶体的生长习性 认领 引用 被引量：24
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作者 李汶军 郑燕青 +2 位作者 施尔畏 陈之战 殷之文 《无机材料学报》 SCIE EI CAS 北大核心 2000年第6期968-976,共9页
通过水热法制备粉体的实验观察到金红石、锐钛矿和а－Al2O3晶体的生长习性．采用配位多面体生长习性法则合理地解释了TiO2和а－Al2O3的生长习性．其主要结果为а－Al2O3晶体的生长习性为平板｛0001｝，其各晶面的生长速度为：V｛0001... 通过水热法制备粉体的实验观察到金红石、锐钛矿和а－Al2O3晶体的生长习性．采用配位多面体生长习性法则合理地解释了TiO2和а－Al2O3的生长习性．其主要结果为а－Al2O3晶体的生长习性为平板｛0001｝，其各晶面的生长速度为：V｛0001｝＜V｛1123｝＜V｛0112｝＝V｛1120｝＜V｛0110｝。金红石的生长习性为柱状，其各晶面的生长速度为：V＜110＞＜V＜100＞＜ V＜101＞＜ V＜001＞＜ V＜111＞；锐钛矿的生长习性为四面体，其各晶面的生长速度为K＜010＞＝V＜001＞＞V＜010＞＞V＜111＞．而PBC理论很难合理地解释а－Al2O3晶体的生长习性． 展开更多
关键词 TiO2 α-Al2O3 生长习性 水热法 晶体生长
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