期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到414篇文章
< 1 2 … 21 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Hollow nano-particles formation for CuO-CeO2-ZrO2 via a supercritical anti-solvent process 认领 引用 被引量：1
1
作者 姜浩锡 周佳丽 +2 位作者 孙焕花 李永辉 张敏华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第11期1126-1133,共8页
Hollow CuO-CeO2-ZrO2nano-particles were prepared with supercritical anti-solvent apparatus by using methanol as sol-vent and supercritical carbon dioxide as anti-solvent. Two key factors （i.e., pressure and temperat... Hollow CuO-CeO2-ZrO2nano-particles were prepared with supercritical anti-solvent apparatus by using methanol as sol-vent and supercritical carbon dioxide as anti-solvent. Two key factors （i.e., pressure and temperature） were investigated to explore the effects of catalyst structure and physic-chemical properties （i.e., morphology, reducing property, oxygen storage capacity and specific surface area）. The resulting materials were characterized with X-ray diffraction （XRD）, high resolution transmission electron micros-copy （HRTEM）, Brunauer-Emmett-Teller （BET）,hydrogen temperature programmed reduction （H2-TPR） and oxygen storage capac-ity （OSC） measurement, respectively. The experimental results showed that lower temperatures promoted production of hollow struc-ture nano-particulates. The particle morphology also changed significantly, i.e. the solid construction was first transferred to hollow structure then back to solid construction. The optimal conditions for obtaining hollow nano-particles were determined at 45 °C, 18.0–24.0 MPa. 展开更多
关键词 supercritical anti-solvent （SAS） CuO-CeO2-ZrO2 nano-particulate hollow structure rare earths
暂未订购 下载PDF
CuO-CeO2-ZrO2催化剂制备及其对CO选择性氧化性能的研究 认领 引用 被引量：3
2
作者 林晓敏 董新法 林维明 《石油与天然气化工》 CAS 北大核心 2008年第5期361-364,共4页
采用柠檬酸溶胶-凝胶法制备一系列CuO-CeO2-ZrO2复合氧化物催化剂,利用微反应-色谱装置对催化剂CO选择性氧化的催化性能进行了评价,并用XRD、TPR等对样品进行了表征。考察了不同柠檬酸/硝酸盐(c)配比对催化剂反应性能的影响。结果表明,... 采用柠檬酸溶胶-凝胶法制备一系列CuO-CeO2-ZrO2复合氧化物催化剂,利用微反应-色谱装置对催化剂CO选择性氧化的催化性能进行了评价,并用XRD、TPR等对样品进行了表征。考察了不同柠檬酸/硝酸盐(c)配比对催化剂反应性能的影响。结果表明,当c为1.75时,催化剂表现出最佳的催化性能,在140℃～190℃温度区间,CO转化率在99%以上,且保持相对较高的选择性。实验结果还表明,催化剂的焙烧温度对催化活性也有很大的影响,550℃焙烧获得的催化剂表面非晶相CuO负载量最高,相应的催化剂活性也较高。 展开更多
关键词 CO选择性氧化 溶胶-凝胶法 CuO—CeO2-ZrO2催化剂
暂未订购 下载PDF
CuO-CeO_2-ZrO_2/HZSM-5催化CO_2加氢直接合成DME 认领 引用 被引量：2
3
作者 陈高明 王华 +2 位作者 高文桂 张健 魏刚 《材料导报》 CAS 北大核心 2010年第14期104-107,共4页
采用共沉淀法制备了一系列不同n(Ce)(Zr)时的CuO-CeO2-ZrO2甲醇合成催化剂,运用X射线衍射(XRD)、N2物理吸附(BET)和H2程序升温还原(H2-TPR)等手段对催化剂进行了表征分析。将甲醇合成催化剂与HZSM-5分子筛按照一定质量比进行机械混合,CO... 采用共沉淀法制备了一系列不同n(Ce)(Zr)时的CuO-CeO2-ZrO2甲醇合成催化剂,运用X射线衍射(XRD)、N2物理吸附(BET)和H2程序升温还原(H2-TPR)等手段对催化剂进行了表征分析。将甲醇合成催化剂与HZSM-5分子筛按照一定质量比进行机械混合,CO2加氢直接合成DME双功能催化剂。在固定床反应器中,温度250℃、压力3MPa、H2/CO2=3/1以及空速1800h-1的条件下,对双功能催化剂进行了活性评价。结果表明,当n(Ce)(Zr)=1/1时,CO2转化率最高;当n(Ce)(Zr)=1/3时,DME的选择性最好,Ce的加入并未有效降低CO的含量。 展开更多
关键词 二氧化碳 加氢 二甲醚CuO-CeO2—ZrO2催化剂
暂未订购 下载PDF
制备方法对CuO/CeO_2-ZrO_2催化CO低温氧化活性的影响 认领 引用 被引量：11
4
作者 杨志强 毛东森 +1 位作者 郭强胜 顾蕾 《物理化学学报》 SCIE CAS 北大核心 2010年第12期3278-3284,共7页
采用微波加热分解法(一步法)和微波加热处理共沉淀+浸渍法(两步法)制备了CuO/CeO2-ZrO2催化剂,并对其进行了X射线衍射、低温氮气吸附/脱附和程序升温还原等表征,采用色谱流动法考察了催化剂的催化CO低温氧化性能.结果表明,一步法比两步... 采用微波加热分解法(一步法)和微波加热处理共沉淀+浸渍法(两步法)制备了CuO/CeO2-ZrO2催化剂,并对其进行了X射线衍射、低温氮气吸附/脱附和程序升温还原等表征,采用色谱流动法考察了催化剂的催化CO低温氧化性能.结果表明,一步法比两步法更有利于使催化剂表面CuO高度分散,CuO与CeO2-ZrO2间的相互作用更强,CuO更容易被还原,从而具有更高的催化CO氧化活性.与CeO2-ZrO2有相互作用的高分散和小颗粒CuO有利于催化剂活性的提高,与CeO2-ZrO2无相互作用的大颗粒CuO对催化剂的活性有抑制作用. 展开更多
关键词 催化活性 CuO/CeO2-ZrO2 CO氧化 微波加热
暂未订购 下载PDF
制备方法对CuO-CeO_2/ZrO_2催化CO氧化性能的影响 认领 引用 被引量：6
5
作者 杨志强 毛东森 +2 位作者 杨超杰 郭强胜 卢冠忠 《无机化学学报》 SCIE CAS CSCD 北大核心 2012年第7期1353-1359,共7页
以ZrO2为载体、采用不同的浸渍次序制备了3种CuO-CeO2/ZrO2催化剂并在不同的温度(500,650和800℃)下进行焙烧,利用X射线衍射(XRD)、程序升温还原(H2-TPR和CO-TPR)及CO程序升温脱附(CO-TPD)技术对所制备的催化剂进行了表征,并采用色谱流... 以ZrO2为载体、采用不同的浸渍次序制备了3种CuO-CeO2/ZrO2催化剂并在不同的温度(500,650和800℃)下进行焙烧,利用X射线衍射(XRD)、程序升温还原(H2-TPR和CO-TPR)及CO程序升温脱附(CO-TPD)技术对所制备的催化剂进行了表征,并采用色谱流动法考察了其催化CO低温氧化反应性能。结果表明,当焙烧温度为650℃时,3种催化剂的CO催化氧化活性均最佳,且三者的催化活性大小顺序为:CuO/CeO2/ZrO2>CuO-CeO2/ZrO2>CeO2/CuO/ZrO2。结合催化剂的表征和活性测试结果,我们认为高分散的CuO是CO的吸附中心,有利于CO的低温氧化反应,而大颗粒的CuO几乎对CO没有吸附作用,不利于CO的低温氧化反应。在3种催化剂中,CuO/CeO2/ZrO2催化剂具有最佳的低温还原特性和最大的CO2脱附峰面积,相应地具有最佳的催化氧化活性。 展开更多
关键词 浸渍法 CuO-CeO2/ZrO2 催化活性 CO氧化
暂未订购 下载PDF
堇青石蜂窝陶瓷负载CuO/CeO_2-ZrO_2/TiO_2催化氧化含酚废水的性能研究 认领 引用 被引量：10
6
作者 郭松林 肖素萍 徐小勇 《陶瓷学报》 CAS 北大核心 2011年第4期529-533,共5页
选取球状堇青石蜂窝陶瓷作为催化剂基体,制备了堇青石蜂窝陶瓷负载CuO/CeO2-ZrO2/TiO2催化剂,采用XRD、BET等方法对其进行了结构表征,测定了其催化湿式氧化含酚废水的活性及抗压强度、脱落率、Cu2+溶出浓度等性能指标。结果表明,CuO/CeO... 选取球状堇青石蜂窝陶瓷作为催化剂基体,制备了堇青石蜂窝陶瓷负载CuO/CeO2-ZrO2/TiO2催化剂,采用XRD、BET等方法对其进行了结构表征,测定了其催化湿式氧化含酚废水的活性及抗压强度、脱落率、Cu2+溶出浓度等性能指标。结果表明,CuO/CeO2-ZrO2/TiO2堇青石蜂窝陶瓷催化剂在反应温度180℃、压力5Mpa、搅拌速率为600r/min时,催化湿式氧化反应200minCOD去除率可达92.7%;球状堇青石蜂窝陶瓷CuO/CeO2-ZrO2/TiO2催化剂具有强度高、易装填、易更换、脱落率低特点,Cu2+溶出浓度低于环保排放标准,适合工业化处理含酚废水。 展开更多
关键词 湿式氧化 催化湿式氧化 含酚废水 蜂窝陶瓷 CuO/CeO2-ZrO2/TiO2催化剂
暂未订购 下载PDF
Influence of calcination temperature on selective catalytic reduction of NO_x with NH_3 over CeO_2-ZrO_2-WO_3 catalyst 认领 引用 被引量：16
7
作者 李军燕 宋忠贤 +4 位作者 宁平 张秋林 刘昕 李昊 黄真真 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第7期726-735,共10页
A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction （SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure... A series of CeO2-ZrO2-WO3 catalysts for the selective catalytic reduction （SCR） of NO with NH3 were prepared by hydrothermal method. The influence of calcination temperature on the catalytic activity, microstructure, surface acidity and redox behavior of CeO2-ZrO2-WO3 catalyst was investigated using various characterization methods. It was found that the CeO2-ZrO2-WO3 catalyst calcined at 600 ℃ showed the best catalytic performance and excellent N2 selectivity, and yielded more than 90% NO conversion in a wide temperature range of 250-500 ℃ with a space velocity （GHSV） of 60000 131. As the calcination temperature was increased from 400 to 600 ℃, the NO conversion obviously increased, but decreased at higher calcination temperature. The results implied that the higher surface area, the strongest synergistic interaction, the superior redox property and the highly dispersed or amorphous WO3 species contributed to the excellent SCR activity of the CeO2-ZrO2-WO3 catalyst calcined at 600℃. 展开更多
关键词 CeO2-ZrO2-WO3 selective catalytic reduction calcination temperature amorphous synergistic interaction rare earths
暂未订购 下载PDF
纳米复合材料Ag/TiO_2-ZrO_2的制备及其微波增强光催化降解甲基橙 认领 引用 被引量：26
8
作者 李莉 陆丹 +1 位作者 计远 赵月红 《物理化学学报》 SCIE CAS 北大核心 2010年第5期1323-1329,共7页
采用EO20PO70EO20(P123)作模板剂,通过溶胶-凝胶-程序升温溶剂热一步法,并经萃取处理制备了具有光催化活性的纳米复合材料Ag/TiO2-ZrO2.用X射线衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、N2吸附-脱附测定和扫描电子显微... 采用EO20PO70EO20(P123)作模板剂,通过溶胶-凝胶-程序升温溶剂热一步法,并经萃取处理制备了具有光催化活性的纳米复合材料Ag/TiO2-ZrO2.用X射线衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、N2吸附-脱附测定和扫描电子显微镜配合X射线能量色谱仪(SEM-EDS)等测试手段对其组成、结构及形貌等进行了表征.结果表明,复合材料Ag/TiO2-ZrO2中Ag以单质形式存在,材料具有双孔结构,颗粒分布较均匀,结构也较规整,平均孔径约为3.6和9.0nm.通过微波增强光催化降解染料甲基橙的实验,对复合材料Ag/TiO2-ZrO2的光催化活性进行了探究.实验结果表明,微波辅助光催化效果优于紫外辐射,并且萃取后的合成产物Ag/TiO2-ZrO2在90min内对甲基橙的降解率可达81.5%,其活性高于市售P25以及TiO2-ZrO2. 展开更多
关键词 溶胶-凝胶 Ag/TiO2-ZrO2 光催化 微波 甲基橙
暂未订购 下载PDF
Structure and oxygen storage capacity of Pd/Pr/CeO_2-ZrO_2 catalyst:effects of impregnated praseodymia 认领 引用 被引量：11
9
作者 冉锐 张宏伟 +2 位作者 吴晓东 樊俊 翁端 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第2期108-116,共9页
Praseodymium （Pr） was impregnated to CeO2-ZrO2 solid solution by an impregnation method. The as-obtained Pr modi- fied CeO2-ZrO2 was impregnated with 1 wt.% Pd to prepare the catalysts. The structure and reducibilit... Praseodymium （Pr） was impregnated to CeO2-ZrO2 solid solution by an impregnation method. The as-obtained Pr modi- fied CeO2-ZrO2 was impregnated with 1 wt.% Pd to prepare the catalysts. The structure and reducibility of the fresh and hydrother- really aged catalysts were characterized by X-ray diffraction （XRD）, Raman, X-ray photoelectron spectroscopy （XPS）, CO chemi- sorption and H2 temperature-programmed reduction （H2-TPR）. The oxygen storage capacity （OSC） was evaluated with CO serving as probe gas. Effects of impregnated Pr on the structure and oxygen storage capacity of catalysts were investigated. The results showed that the aged Pr-impregnated samples had much higher OSC and better reducibility than the unmodified ones. The scheme of structural evolutions of the catalysts with and without Pr was also established. Partial of the impregnated Pr diffused into the bulk of CeO2-ZrO2 during ageing, which inhibited the sintering, and increased the amount of oxygen vacancies in CeO2-ZrO2 support. Furthermore, those impregnated Pr species which covered on the surface of the support obstructed the strong metal-support interaction between Pd and Ce so as to reduce the encapsulation of Pd as well as the back spill-over of the oxygen during the catalytic process. 展开更多
关键词 CeO2-ZrO2 praseodymia sintering covering oxygen storage capacity rare earths
暂未订购 下载PDF
Roles of Lewis and Brnsted acid sites in NO reduction with ammonia on CeO_2-ZrO_2-NiO-SO_42- catalyst 认领 引用 被引量：14
10
作者 司知蠢 翁端 +1 位作者 吴晓东 江洋 《Journal of Rare Earths》 SCIE EI CAS 2010年第5期727-731,共5页
Nickel and sulfate co-modified CeO2-ZrO2 catalysts were prepared by sol-gel method. The catalysts were characterized by XRD, FTIR, XPS, NH3 chemisorption and NH3-SCR activity tests. The results showed that the enhance... Nickel and sulfate co-modified CeO2-ZrO2 catalysts were prepared by sol-gel method. The catalysts were characterized by XRD, FTIR, XPS, NH3 chemisorption and NH3-SCR activity tests. The results showed that the enhanced acidity of CeO2-ZrO2 catalysts by nickel and sulfate co-modification was responsible for the broadened temperature window and improved the selectivity to N2 in NH3-SCR deNOx. The introduction of nickel to CeO2-ZrO2 solid solutions resulted in more Ce3+ on surface of catalyst, leading to an in... 展开更多
关键词 CeO2-ZrO2 nickel sulfate acid sites rare earths
暂未订购 下载PDF
MCM-41 supported nano-sized CuO-CeO2 for catalytic combustion of chlorobenzene 认领 引用 被引量：10
11
作者 Jie Zheng Zhu Chen +2 位作者 Jianfei Fang Zhuo Wang Shufeng Zuo 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第9期933-940,I0001,共8页
In this paper,MCM-41 was synthesized by a soft template technique and MCM-41 supported CuO-CeO2 nano-sized catalysts with different Cu/Ce molar ratios were prepared by a deposition-precipitation method.N2 adsorption,H... In this paper,MCM-41 was synthesized by a soft template technique and MCM-41 supported CuO-CeO2 nano-sized catalysts with different Cu/Ce molar ratios were prepared by a deposition-precipitation method.N2 adsorption,HRTEM-EDS,H2-TPR,XPS characterization,as well as catalytic activity and durability tests for the catalytic combustion of chlorobenzene(CB)were conducted to explore the relationship between the structure and catalytic performance of the catalysts.It is revealed that cuCe(6:1)/MCM-41 has the highest activity and can completely catalyze the degradation of CB at 260℃.The reasons for the high activity of the catalysts are as follows:MCM-41,a type of mesoporous material which has large pore size and large specific surface area,is suitable as a catalyst carrier.The average diameter of nano-sized CuO and CeO2 particles is about 3-5 nm and adding CeO2 improves the dispersion of active component CuO,which are highly and evenly dispersed on the surface of MCM-41.Characterization results also explain why MCM-41 supported CuO-CeO2 with appropriate proportion can highly enhance the catalytic activity.The reason is that CeO2 acting as an oxygen-rich material can improve the mobility of oxygen species through continuous redox between Ce4^+and Ce3^+,and improve the catalytic performance of CuO for CB combustion.Besides,CuCe(6:1)/MCM-41 also displays good durability for CB combustion,both in the humid condition and in the presence of benzene,making it a promising catalytic material for the elimination of chlorinated VOCs. 展开更多
关键词 CuO-CeO2 MCM-41 Nano-sized Chlorobenzene Catalytic combustion Rare earths
暂未订购 下载PDF
SiO_2-ZrO_2陶瓷型芯与DZ125,DD5和DD6三种铸造高温合金的界面反应 认领 引用 被引量：23
12
作者 王丽丽 李嘉荣 +1 位作者 唐定中 刘世忠 《材料工程》 EI CAS CSCD 北大核心 2016年第3期9-14,共6页
采用热压注工艺制备以钙稳定氧化锆为矿化剂的SiO2-ZrO2陶瓷型芯试板,继而通过定向凝固分别在1510℃和1530℃制备SiO2-ZrO2型芯与DZ125,DD5和DD6三种高温合金的界面反应空心试板,将空心试板于相同高度处横向剖开,对获得的合金/型芯界面... 采用热压注工艺制备以钙稳定氧化锆为矿化剂的SiO2-ZrO2陶瓷型芯试板,继而通过定向凝固分别在1510℃和1530℃制备SiO2-ZrO2型芯与DZ125,DD5和DD6三种高温合金的界面反应空心试板,将空心试板于相同高度处横向剖开,对获得的合金/型芯界面反应试样的微观形貌进行SEM和EDS分析。结果表明,SiO2-ZrO2陶瓷型芯在1500℃以上的高温化学稳定性差,与DZ125,DD5和DD6合金均发生不同程度的界面化学反应,反应产物类型与合金成分密切相关。对于Hf含量较高的DZ125合金来说,合金中Hf与SiO2-ZrO2型芯中的SiO2反应生成HfO2,并在合金表面富集,阻止了合金中Al与型芯的反应。对于Hf含量较低的DD5,DD6合金来说,合金与SiO2-ZrO2型芯界面反应的产物是Al2O3,其由合金中Al与SiO2反应生成,而矿化剂钙稳定氧化锆对这一界面反应有促进作用。 展开更多
关键词 SiO2-ZrO2陶瓷型芯 DZ125 DD5 DD6 界面反应 钙稳定氧化锆
暂未订购 下载PDF
Effect of CeO2-ZrO2 on Pt/C electrocatalysts for alcohols oxidation 认领 引用 被引量：7
13
作者 王青春 刘振朋 +3 位作者 安胜利 王瑞芬 王艳玲 徐拓 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第3期276-282,共7页
The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized b... The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The electrochemical properties were measured by a three electrode system on electrochemical workstation（IVIUM）. The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C（M=Ce, Zr） for methanol and ethanol oxidation was better than that of Pt-CeO_2/C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity（OSC）. Furthermore, the best performance was found when the molar ratio of CeO_2 to ZrO_2 was 2：1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C（M=Ce, Zr, Ce：Zr=2：1） towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2/C. Pt-MO_x/C（M=Ce, Zr） appeared to be a promising and less expensive methanol oxidation anode catalyst. 展开更多
关键词 CeO2-ZrO2 composite oxide catalyst preparation characterization performance rare earths
暂未订购 下载PDF
Catalytic performance of Zr-doped CuO-CeO2 oxides for CO selective oxidation in H2-rich stream 认领 引用 被引量：9
14
作者 Limin Shi Chuanlei Gao +2 位作者 Fenghai Guo Yujing Wang Tiebang Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第7期720-725,共6页
Zr-doped CuO-CeO2 catalysts for CO selective oxidation were designed and prepared by the hydrothermal method and coprecipitation. The experimental samples were characterized by means of N2 adsorption-desorption isothe... Zr-doped CuO-CeO2 catalysts for CO selective oxidation were designed and prepared by the hydrothermal method and coprecipitation. The experimental samples were characterized by means of N2 adsorption-desorption isotherms, powder X-ray diffraction, temperature-programmed reduction and Xray photoelectron spectroscopy. It is observed that the catalyst prepared by hydrothermal method exhibits larger specific surface area, smaller crystalline size and higher dispersion of active components compared with those of the catalyst obtained by coprecipitation. Meanwhile, redox properties of copper oxide are improved significantly and highly dispersed copper species providing CO oxidation sites are present on the surface. Furthermore, adsorptive centers of CO and active oxygen species increase on the copper-ceria interfaces. The Zr-doped CuO-CeO2 catalyst prepared by hydrothermal method possesses superior catalytic activity and selectivity for selective oxidation of CO at low temperature compared with those of the sample prepared by coprecipitation. The temperature corresponding to 50% CO conversion is only 73 ℃ and the temperature span of total CO conversion is expanded from 120 to 160 ℃. 展开更多
关键词 Catalytic performance CuO-CeO2 oxides Zr doping CO selective oxidation Hydrogen purification Rare earths
暂未订购 下载PDF
共沉淀法制备的CeO2-ZrO2-Al2O3材料及性能 认领 引用 被引量：11
15
作者 李红梅 周菊发 +4 位作者 祝清超 曾少华 魏振玲 陈耀强 龚茂初 《高等学校化学学报》 SCIE CAS 北大核心 2009年第12期2484-2486,共3页
CeO2-based oxygen materials were prepared with co-precipitation method and characterized via Brunauer-Emmet Teller(BET)method,X-ray diffraction(XRD)and temperature-programmed reduction(H2-TPR).This paper revealed that... CeO2-based oxygen materials were prepared with co-precipitation method and characterized via Brunauer-Emmet Teller(BET)method,X-ray diffraction(XRD)and temperature-programmed reduction(H2-TPR).This paper revealed that three CeO2-based oxygen storage materials are all forming homogeneous solid solution.Among the samples,CeO2-ZrO2-Al2O3(CZA)has the best textural properties and excellent thermal stability.The specific surface area and pore volume of aged CZA are 90 m2/g and 0.29 mL/g.We proposed a viewpoint:Al3+ might insert among the interspace of fluorite structure or highly dispersal in solid solutions. 展开更多
关键词 CeO2-ZrO2-Al2O3 共沉淀法 热稳定性能 结构性能 固溶体
暂未订购 下载PDF
整体式V_2O_5-WO_3/TiO_2-ZrO_2催化剂用于NH_3选择性催化还原NO_x 认领 引用 被引量：10
16
作者 李鹏 张亚平 +4 位作者 肖睿 沈凯 孙克勤 徐海涛 周长城 《中南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2013年第4期1719-1726,共8页
通过共沉淀法制备不同锆掺杂量的钛锆复合载体,用分步浸渍法先后浸渍WO3和V2O5得到一系列V2O5-WO3/TiO2-ZrO2催化剂样品,采用X线衍射(XRD)、比表面积测定(BET)、高分辨率透射电子显微镜(HRTEM),程序升温还原(TPR)等表征技术进行相关的... 通过共沉淀法制备不同锆掺杂量的钛锆复合载体,用分步浸渍法先后浸渍WO3和V2O5得到一系列V2O5-WO3/TiO2-ZrO2催化剂样品,采用X线衍射(XRD)、比表面积测定(BET)、高分辨率透射电子显微镜(HRTEM),程序升温还原(TPR)等表征技术进行相关的表征分析,同时在模拟氨气选择性催化还原NOx(NH3-SCR)的反应条件下对催化剂的脱硝反应活性进行考察。研究结果表明:ZrO2含量为50%(摩尔分数)的催化剂具有较好的热稳定性和较宽的活性窗口。模拟烟气中含有0.08%(体积分数)的SO2时,SO2对所研究催化剂的NO脱除具有一定的促进作用。复合载体Ti0.5Zr0.5O2呈无定形态,具有较大的比表面积和孔容,微粒大小均匀,表面分散性良好;WO3和V2O5高度分散在载体的表面;ZrO2的掺入有利于提高催化剂的还原性能。 展开更多
关键词 V2O5 WO3 TiO2-ZrO2 催化还原 抗SO2
暂未订购 下载PDF
A rationale for the development of thermally stable nanostructured CeO_2-ZrO_2-containing mixed oxides 认领 引用 被引量：10
17
作者 Roberta Di Monte Jan Kapar +1 位作者 Heather Bradshaw Colin Norman 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期136-140,共5页
CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for... CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for practical application since temperatures up to 1273 K are easily experienced by these materials under real working conditions. In the present paper, we investigated how hydrothermal treatments applied to cakes of doped and undoped ZrO2-rich CeO2-ZrO2 precursors might improve the thermal stability of the final CeO2-ZrO2 solid solution. A rationale was developed that allowed to correlate the morphology of the hydrothermaUy treated cake with the thermal stability at 1273 K of the final product, which did not depend on the composition of the mixed oxides. 展开更多
关键词 CeO2-ZrO2 mixed oxides CeO2-ZrO2 solid solution CeO2-ZrO2 mixed oxides, thermal stability of three-way catalysts oxygen storage capacity rare earths
暂未订购 下载PDF
Regeneration of the deactivated TiO_2-ZrO_2-CeO_2 /ATS catalyst for NH_3-SCR of NO_x in glass furnace 认领 引用 被引量：11
18
作者 杨波 沈岳松 +1 位作者 沈树宝 祝社民 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第2期130-136,共7页
Larger amounts of alkalis, alkali earth metals and sulfides in flue gas from glass furnace were easier to deactivate selective catalytic reduction （SCR） catalyst compared to the flue gases from other stationary sour... Larger amounts of alkalis, alkali earth metals and sulfides in flue gas from glass furnace were easier to deactivate selective catalytic reduction （SCR） catalyst compared to the flue gases from other stationary sources. Catalyst regeneration has been an emerging research topic for flue gas denitrification in glass furnace. Regeneration of the deactivated TiO2-ZrO2-CeO2 /Al2TiO 5 -TiO2-SiO2 （ATS） complex phase ceramics catalysts used for NH3 -SCR of NO x in glass furnace was studied in this work. Effects of regeneration methods, including washing with different aqueous solutions and sulfuric acid, thermal regeneration, thermal reduction regeneration, and thermal regeneration with SO2 , on catalytic performance were comparatively investigated. In comparison of catalytic activities between the catalysts before and after regeneration, results showed that washing was the most effective regeneration method, and the sulfuric acid concentration of the washing solution was an important factor. Washing time directly affected catalyst regeneration efficiency and catalyst life. The regenerated TiO2-ZrO2 -CeO2 /ATS catalyst regained more than 90% NO conversion after being washed with 10 wt.% H2SO4 for 30 min. 展开更多
关键词 deactivated TiO 2 -ZrO 2 -CeO 2 /ATS regeneration method catalytic performance glass furnace rare earths
暂未订购 下载PDF
Modification of CeO2-ZrO2catalyst by potassium for NOx-assisted soot oxidation 认领 引用 被引量：11
19
作者 Duan Weng Jia Li +1 位作者 Xiaodong Wu Zhichun Si 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2011年第1期145-150,共6页
Potassium-modified ceria-zirconia catalyst was synthesized by wetness impregnation method.The ageing treatment was performed in static air at 800℃for 20 hr to evaluate the thermal stability of the catalyst.The cataly... Potassium-modified ceria-zirconia catalyst was synthesized by wetness impregnation method.The ageing treatment was performed in static air at 800℃for 20 hr to evaluate the thermal stability of the catalyst.The catalysts were characterized by X-ray diffraction,BET surface area,oxygen storage capacity,NOx-temperature programmed desorption and soot-temperature programmed oxidation measurements.By introduction of potassium,the maximum soot oxidation rate temperature(Tin)of the ceria-zirconia based catalyst decreased from 525 to 428℃in the presence of NO under a loose contact mode.The shift of Tm of the K-modified catalyst after ageing is only 15℃.The enhanced activity of the aged catalyst mainly lies in the promotional effect of potassium on the NOx/oxygen storage capacity as well as the soot-catalyst contact. 展开更多
关键词 CeO2-ZrO2 mixed oxides potassium soot combustion NOx storage oxygen storage capacity
暂未订购 下载PDF
水蒸汽对Ni/CeO_2-ZrO_2-Al_2O_3催化剂上CO_2+CH_4重整反应的影响 认领 引用 被引量：11
20
作者 李春林 伏义路 +4 位作者 孟明 卞国柱 谢亚宁 胡天斗 张静 《Chinese Journal of Chemical Physics》 SCIE CAS 北大核心 2004年第1期95-99,共5页
用水热合成法制备了Ni/CeO2 ZrO2 Al2 O3 催化剂 .进行了添加和不添加水蒸汽的CH4 +CO2 催化重整反应 ,测试了活性和稳定性 ,测量了积碳量 ,并用XAFS手段测试了催化剂Ni的K吸收边 .结果表明 ,在反应过程中有CeAlO3 的生成 ,但积碳是无... 用水热合成法制备了Ni/CeO2 ZrO2 Al2 O3 催化剂 .进行了添加和不添加水蒸汽的CH4 +CO2 催化重整反应 ,测试了活性和稳定性 ,测量了积碳量 ,并用XAFS手段测试了催化剂Ni的K吸收边 .结果表明 ,在反应过程中有CeAlO3 的生成 ,但积碳是无水蒸汽添加的反应活性降低的原因 .反应气中添加水蒸汽能够减少积碳 ,从而提高催化反应的稳定性 .由于碳原子插入Ni晶格 ,无水蒸汽反应后的最近邻Ni Ni配位数有较大幅度的减少 .添加了水蒸汽的反应 ,最近邻Ni Ni配位数比反应前减少幅度小 ,这主要是由于在反应气中添加水蒸汽减少了积碳 。 展开更多
关键词 CO2+CH4重整反应 添加水蒸汽 Ni/CeO2-ZrO2-Al2O3催化剂 XAFS 积碳
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 21 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈