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Effect of Ce doping of TiO_2 support on NH_3-SCR activity over V_2O_5–WO_3/CeO_2–TiO_2 catalyst 认领 引用 被引量:30
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作者 Kai Cheng Jian Liu +5 位作者 Tao Zhang Jianmei Li Zhen Zhao Yuechang Wei Guiyuan Jiang Aijun Duan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第10期2106-2113,共8页
CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction(SCR) of NOx with NH3 were p... CeO2–TiO2composite supports with different Ce/Ti molar ratios were prepared by a homogeneous precipitation method, and V2O5–WO3/CeO2–TiO2catalysts for the selective catalytic reduction(SCR) of NOx with NH3 were prepared by an incipient-wetness impregnation method. These catalysts were characterized by means of BET, XRD, UV–Vis,Raman and XPS techniques. The results showed that the catalytic activity of V2O5–WO3/TiO2 was greatly enhanced by Ce doping(molar ratio of Ce/Ti = 1/10) in the TiO2 support.The catalysts that were predominantly anatase TiO2 showed better catalytic performance than the catalysts that were predominantly fluorite CeO2. The Ce additive could enhance the surface adsorbed oxygen and accelerate the SCR reaction. The effects of O2 concentration, ratio of NH3/NO, space velocity and SO2 on the catalytic activity were also investigated. The presence of oxygen played an important role in NO reduction. The optimal ratio of NH3/NO was 1/1 and the catalyst had good resistance to SO2 poisoning. 展开更多
关键词 CeO2–TiO2 SCR Nitrogen oxides Homogeneous precipitation method SO2poisoning
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ZrO_2-TiO_2-CeO_2的制备及其在NH_3选择性催化还原NO中的应用 认领 引用 被引量:18
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作者 林涛 李伟 +3 位作者 龚茂初 喻瑶 杜波 陈耀强 《物理化学学报》 SCIE CAS 北大核心 2007年第12期1851-1856,共6页
采用共沉淀法制备了载体材料TiO2、ZrO2-TiO2及ZrO2-TiO2-CeO2,并利用X射线衍射(XRD)实验、比表面积测定(BET)、程序升温脱附(NH3-TPD)、储氧性能测定(OSC)及程序升温还原(H2-TPR)等方法对三种载体材料进行了表征.结果表明,ZrO2-TiO2-C... 采用共沉淀法制备了载体材料TiO2、ZrO2-TiO2及ZrO2-TiO2-CeO2,并利用X射线衍射(XRD)实验、比表面积测定(BET)、程序升温脱附(NH3-TPD)、储氧性能测定(OSC)及程序升温还原(H2-TPR)等方法对三种载体材料进行了表征.结果表明,ZrO2-TiO2-CeO2具有较多的表面强酸位,并具有一定的储氧性能和较强的氧化还原性能.以三种材料为载体,制备了质量分数分别为1%、9%的V2O5、WO3的整体式催化剂.研究了三种催化剂在富氧条件下用NH3选择性催化还原NO的催化性能.结果表明,以ZrO2-TiO2-CeO2为载体的催化剂在反应空速为10000h-1,275℃时,NO的转化率接近100%,具有最好的催化活性,并有良好的应用前景. 展开更多
关键词 ZrO2-TiO2-CeO2 ZrO2-TiO2 TiO2 选择性催化还原 NO NH3
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Promoting effect of microwave irradiation on CeO2-TiO2 catalyst for selective catalytic reduction of NO by NH3 认领 引用 被引量:20
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作者 Jie Cheng Liyun Song +5 位作者 Rui Wu Shining Li Yanming Sun Hongtai Zhu Wenge Qiu Hong He 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第1期59-69,共11页
In this work we prepared several CeO2-TiO2 catalysts for the NH3-SCR reactionusing co-precipitation with assistance of microwave irradiation.The catalytic NH3-SCR activities over CeO2-TiO2 catalysts at low temperature... In this work we prepared several CeO2-TiO2 catalysts for the NH3-SCR reactionusing co-precipitation with assistance of microwave irradiation.The catalytic NH3-SCR activities over CeO2-TiO2 catalysts at low temperatures are largely enhanced by the treatment of microwave irradiation,the operation temperature window is also broadened.For better understanding the promotion mechanism,the catalyst prepared by conventional co-precipitation with and without microwave irradiation treatment was characterized with H2-TPR,NH3-TPD,XPS,XRD and BET.Microwave irradiation treatment accelerates the crystallite rate of CeO2-TiO2 catalysts,and greatly enlarges their surface area by adjusting their microstructures.The resistance to SO2 and H2O is also improved via regulating the hierarchical pore structure by the microwave irradiation.Microwave irradiation treatment can also improve the redox property and increase the acid sites over the catalyst surfaces.The result of in situ DRIFTS suggests that the microwave irradiation treatment generates more Br?nsted acid sites on CeO2-TiO2-2 h catalyst,helpful in SCR reactions.XPS results show that after microwave irradiation on the CeO2-TiO2 catalysts,the surface demonstrates an elevated concentration of chemisorbed oxygen,consequently leading to better oxidation of NO to NO2.Additionally,the molar ratio of Ce3+/Ce4+has been elevated after being treated by microwave irradiation,a vital factor in enhancing the NH3-SCR activities. 展开更多
关键词 SCR catalyst NH3-SCR Low temperature CeO2-TiO2 Microwave irradiation Rare earths
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CeO_2/TiO_2复合纳米纤维的制备及光催化性能研究 认领 引用 被引量:27
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作者 李跃军 曹铁平 +1 位作者 王长华 邵长路 《化学学报》 SCIE CAS CSCD 北大核心 2011年第21期2597-2602,共6页
采用静电纺丝技术和水热合成法制备了CeO2/TiO2复合纳米纤维.利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)和比表面积测定(BET)等分析测试手段对样品的形貌及结构进行了表征,并以罗丹明B的脱色降解为模式反应,... 采用静电纺丝技术和水热合成法制备了CeO2/TiO2复合纳米纤维.利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)和比表面积测定(BET)等分析测试手段对样品的形貌及结构进行了表征,并以罗丹明B的脱色降解为模式反应,考察了样品的光催化性能.结果表明:CeO2纳米粒子均匀地生长在TiO2纳米纤维表面,形成了异质结构的CeO2/TiO2复合纳米纤维光催化材料.通过改变碱源,可以得到不同形貌的CeO2.CeO2的存在增加了TiO2纳米纤维的比表面积,有效地实现TiO2光生电子和空穴的分离,增强了体系的量子效率,与纯TiO2纳米纤维相比光催化活性明显提高.初步探讨了异质结的形成机理. 展开更多
关键词 CeO2/TiO2复合纳米纤维 静电纺丝技术 水热合成 光催化
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CeO_2-TiO_2复合氧化物载体在催化中的应用研究进展 认领 引用 被引量:10
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作者 叶季蕾 刘源 +1 位作者 闻学兵 刘鹏翔 《化工进展》 CAS 北大核心 2005年第7期733-736,共4页
介绍了CeO2-TiO2复合氧化物制备方法及性能特征;评述了影响CeO2-TiO2复合氧化物结构、性质的因素;对负载金属元素后的催化剂在不同的催化反应中的应用进行了综述。并对CeO2-TiO2复合氧化物应用前景作了展望。
关键词 CeO2 TiO2 复合氧化物 载体 催化剂
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溶胶-凝胶法制备玻璃表面CeO_2-TiO_2紫外吸收薄膜的研究 认领 引用 被引量:12
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作者 董玉红 赵青南 +1 位作者 马鸣明 汪振东 《中国稀土学报》 CAS 北大核心 2009年第3期399-403,共5页
分别以Ce(NO3)3.6H2O和Ti(OC4H9)4为前驱体制备CeO2和TiO2溶胶,通过改变Ce/Ti摩尔比(0/10,1/9,2/8,3/7,4/6,5/5,6/4,7/3,8/2,9/1,10/0)得到一系列复合溶胶,采用提拉法在玻璃基片上制备了CeO2-TiO2紫外吸收膜层。利用紫外-可见光谱、XRD... 分别以Ce(NO3)3.6H2O和Ti(OC4H9)4为前驱体制备CeO2和TiO2溶胶,通过改变Ce/Ti摩尔比(0/10,1/9,2/8,3/7,4/6,5/5,6/4,7/3,8/2,9/1,10/0)得到一系列复合溶胶,采用提拉法在玻璃基片上制备了CeO2-TiO2紫外吸收膜层。利用紫外-可见光谱、XRD对各溶胶以及溶胶沉积的薄膜进行了表征;用SEM观察了镀3层膜和镀7层膜样品的新鲜断面,得到膜厚,借以验证计算所得数据的可用性。结果表明,溶胶的颜色产生变化与溶胶中Ti3+浓度有关;由于CeO2和TiO2相互作用,复合溶胶及其膜层的紫外线吸收能力分别强于纯的CeO2和纯的TiO2,吸收曲线向长波方向移动;膜层中CeO2晶体会使膜面雾化,膜层内的Ce/Ti固溶体或当晶体微小和呈非晶态时,均不影响膜面质量;当薄膜达到一定厚度的时候,紫外线几乎全部被阻隔;在临界厚度内,膜层越厚阻隔效果越好,且对可见光区域的透过率基本无影响,均在70%~80%。 展开更多
关键词 CeO2-TiO2 紫外吸收 溶胶-凝胶法 稀土
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CeO2/TiO2光催化剂的制备及其可见光脱氮性能 认领 引用 被引量:5
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作者 陈峰 郑柳萍 +2 位作者 黄莹莹 颜桂炀 王颖 《应用化学》 CAS CSCD 北大核心 2015年第7期801-807,共7页
采用溶胶-凝胶和浸渍掺杂两步法合成了Ce O2/Ti O2光催化剂,并对催化剂的理化结构进行表征分析;以吡啶-正辛烷体系为模拟油品氮源,研究了该催化剂在可见光作用下的光催化脱氮行为,并探究了光催化脱氮的最佳反应条件。结果表明,掺杂的铈... 采用溶胶-凝胶和浸渍掺杂两步法合成了Ce O2/Ti O2光催化剂,并对催化剂的理化结构进行表征分析;以吡啶-正辛烷体系为模拟油品氮源,研究了该催化剂在可见光作用下的光催化脱氮行为,并探究了光催化脱氮的最佳反应条件。结果表明,掺杂的铈主要以Ce O2的形式存在,且增强了催化剂在可见光区的吸收;在可见光辐照150 min的条件下,铈的掺杂量质量分数为8%,所制备的Ce O2/Ti O2催化剂投入量为1.0 g/L时,模拟油品中吡啶的脱氮率高达76.45%。 展开更多
关键词 光催化剂 CeO2/TiO2 模拟油品 脱氮
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Effect of praseodymium additive on CeO2(ZrO2)/TiO2 for selective catalytic reduction of NO by NH3 认领 引用 被引量:14
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作者 金奇杰 沈岳松 +3 位作者 祝社民 刘青 李喜红 严巍 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第11期1111-1120,共10页
A series of praseodymium added CeO2(ZrO2)/TiO2 catalysts separately prepared by methods of sol-gel and impregnation were tested for selective catalytic reduction of NO, and characterized by X-ray diffraction (XRD)... A series of praseodymium added CeO2(ZrO2)/TiO2 catalysts separately prepared by methods of sol-gel and impregnation were tested for selective catalytic reduction of NO, and characterized by X-ray diffraction (XRD), N2-brumauer-emmett-teller (N2-BET), NH3-temperature programmed desorption (NH3-TPD), H2-temperature programmed reduction (H2-TPR), PL spectra, Ra-man spectra, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), respectively. Influence of prepara-tion method on catalytic performance was studied. Results showed that the influence of Pr addition on catalytic performance of the CeO2(ZrO2)/TiO2 catalysts was different between the sol-gel method and the impregnation method. The Pr addition tended to interact with TiO2 and formed the structure of Ti-O-Pr in the sol-gel method while it was more likely to interact with CeO2 forming the struc-ture of Ce-O-Pr in the impregnation method. The total acid amount and redox properties of the catalysts prepared by sol-gel method decreased with the addition of Pr element, which resulted in decrease of catalytic activity. In contrast, the Pr-added catalyst prepared by impregnation method was found to possess easier reducibility, more total acid amount and higher proportion of Ce3+ species, which was favourable for higher catalytic activity. 展开更多
关键词 praseodymium-added CeO2(ZrO2)/TiO2 preparation method selective catalytic reduction catalytic performance rare earths
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Zr改性CeO_2/TiO_2催化剂选择性催化还原烟气脱硝性能 认领 引用 被引量:4
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作者 姜烨 梁贵涛 +3 位作者 保长忠 闫艳 王雪冲 邢志敏 《中国石油大学学报(自然科学版)》 EI CAS CSCD 北大核心 2017年第5期139-145,共7页
采用Zr对CeO_2/TiO_2催化剂进行改性,考察Zr掺杂对CeO_2/TiO_2催化剂NH_3选择性催化还原NO性能的影响,利用静态N_2物理吸附、X射线衍射(XRD)、NH_3程序升温脱附(NH_3-TPD)和X射线光电子能谱(XPS)对其脱硝机制进行分析。结果表明,Zr掺杂... 采用Zr对CeO_2/TiO_2催化剂进行改性,考察Zr掺杂对CeO_2/TiO_2催化剂NH_3选择性催化还原NO性能的影响,利用静态N_2物理吸附、X射线衍射(XRD)、NH_3程序升温脱附(NH_3-TPD)和X射线光电子能谱(XPS)对其脱硝机制进行分析。结果表明,Zr掺杂能够拓宽CeO_2/TiO_2催化剂的温度窗口,提高其脱硝活性和抗H_2O/SO_2性能。Zr掺杂能够增大CeO_2/TiO_2催化剂的比表面积和总孔容,抑制载体锐钛矿TiO_2发生晶相转变,显著提高催化剂的表面酸性,增加催化剂表面Ce3+和化学吸附氧的原子浓度,使得催化剂表面NH_3吸附能力加强,氧化还原能力提高,有助于促进SCR反应的进行。 展开更多
关键词 烟气脱硝 选择性催化还原 Zr改性 CeO2/TiO2催化剂 活性
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Improved sulfur-resistant ability on CO oxidation of Pd/Ce0.75Zr0.25O_2 over Pd/CeO_2-TiO_2 and Pd/CeO_2 认领 引用 被引量:3
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作者 沈美庆 林放 +2 位作者 魏光曦 王建强 朱少春 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第1期56-61,共6页
The influence of sulfation on Pd/Ce0.75Zr0.25O2, Pd/Ce O2-Ti O2 and Pd/Ce O2 was investigated. Physical structure and chemical properties of different catalysts were characterized by N2 adsorption, X-ray diffraction(... The influence of sulfation on Pd/Ce0.75Zr0.25O2, Pd/Ce O2-Ti O2 and Pd/Ce O2 was investigated. Physical structure and chemical properties of different catalysts were characterized by N2 adsorption, X-ray diffraction(XRD), CO chemisorption, X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR) and X-ray fluorescence(XRF). After 10 h SO2 sulfation, it was found that the decrement on CO oxidation catalytic activity was limited on Pd/Ce0.75Zr0.25O2 compared to Pd/Ce O2-Ti O2 and Pd/Ce O2. It demonstrated that Pd/Ce0.75Zr0.25O2 was more sulfur resistant compared to the other two catalysts. After sulfur exposure, catalyst texture was not much influenced as shown by N2 adsorption and XRD, and surface Pd atoms were poisoned indicated by CO chemisorption results. Pd/Ce0.75Zr0.25O2 and Pd/Ce O2-Ti O2 exhibited less sulfur accumulation compared to Pd/Ce O2 in the sulfation process. Furthermore, XPS results clarified that surface sulfur amount, especially surface sulfates amount on the sulfated catalysts was more crucial for the deactivation in sulfur containing environment. 展开更多
关键词 Pd/Ce0.75Zr0.25O2 Pd/CeO2-TiO2 diesel oxidation catalyst SO2 poison XPS rare earths
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Au/CeO_2-TiO_2表面物种在还原和CO氧化过程中的变化 认领 引用 被引量:4
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作者 俞俊 吴贵升 +1 位作者 毛东森 卢冠忠 《化学学报》 SCIE CAS 北大核心 2009年第13期1407-1411,共5页
采用溶胶-凝胶法制备了CeO2-TiO2载体,再用沉积沉淀法制备了Au/CeO2-TiO2催化剂.利用原位漫反射红外(FT-IR),程序升温还原(TPR)、X射线衍射(XRD)、N2吸附-脱附方法考察了催化剂的结构和表面性能.结果表明,CeO2的存在有效抑制TiO2晶粒的... 采用溶胶-凝胶法制备了CeO2-TiO2载体,再用沉积沉淀法制备了Au/CeO2-TiO2催化剂.利用原位漫反射红外(FT-IR),程序升温还原(TPR)、X射线衍射(XRD)、N2吸附-脱附方法考察了催化剂的结构和表面性能.结果表明,CeO2的存在有效抑制TiO2晶粒的长大,增加TiO2的比表面积和晶格应变,从而增强了Au和载体中TiO2的相互作用,使得催化剂表面的氧化能力显著增强.结合原位CO吸附的FT-IR结果表明,不同温度的还原预处理能有效改变催化剂表面氧物种的组成,并对不同氧物种在CO低温氧化过程中的作用进行了分析. 展开更多
关键词 Au催化剂 CO氧化 CeO2-TiO2载体 表面物种
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sol-gel法制备CeO_2-TiO_2/凹凸棒石复合材料的催化性能 认领 引用 被引量:6
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作者 孟英芹 赵晓兵 李霞章 《化工学报》 EI CSCD 北大核心 2013年第7期2679-2686,共8页
以凹凸棒石(ATP)为载体,Ce(NO3)3.6H2O和Ti(OBu)4为原料,冰醋酸为抑制剂,采用溶胶-凝胶法制备CeO2-TiO2/ATP纳米复合材料。利用TG-DSC、TEM、XRD和N2吸附/脱附仪对复合材料进行表征,考察铈钛摩尔比对所制备样品催化降解罗丹明B溶液性能... 以凹凸棒石(ATP)为载体,Ce(NO3)3.6H2O和Ti(OBu)4为原料,冰醋酸为抑制剂,采用溶胶-凝胶法制备CeO2-TiO2/ATP纳米复合材料。利用TG-DSC、TEM、XRD和N2吸附/脱附仪对复合材料进行表征,考察铈钛摩尔比对所制备样品催化降解罗丹明B溶液性能的影响。结果表明,当Ce/Ti≥5/5时,具有立方萤石结构的氧化物颗粒以固溶体形式均匀分布在ATP表面,颗粒尺寸约5~10nm;随Ti 4+的进一步增加,样品中的CeO2结晶不完全;当Ce/Ti<3/7时,样品中出现锐钛矿型TiO2的分离相。适量的Ti 4+掺杂能促进CeO2产生较多的结构缺陷,有利于增加晶格氧空位的浓度,提高样品的催化活性。对罗丹明B的催化降解实验表明,当Ce/Ti=5/5时,样品的催化性能较好,对罗丹明B溶液的化学需氧量(COD)去除率可达96%以上。 展开更多
关键词 凹凸棒石 CeO2-TiO2 催化性能
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Novel CeO_2@TiO_2 core–shell nanostructure catalyst for selective catalytic reduction of NOx with NH_3 认领 引用 被引量:22
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作者 Bingjie Huang Danqing Yu +1 位作者 Zhongyi Sheng Liu Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第5期129-136,共8页
The CeO2@TiO2 core-shell nanostructure catalyst prepared by a two-step hydrothermal method was used for selective catalytic reduction (SCR) of NOx with NH3 in this study. The catalyst presented the obvious core-shel... The CeO2@TiO2 core-shell nanostructure catalyst prepared by a two-step hydrothermal method was used for selective catalytic reduction (SCR) of NOx with NH3 in this study. The catalyst presented the obvious core-shell structure, and the shell was amorphous TiO2 which could protect the active center from the SO2 erosion. The catalyst showed high activity and stability, excellent N2 selectivity and superior SO2 resistance and H2O tolerance. Characterizations such as TEM, HR-TEM, XRD, BET, XPS, NH3-TPD, and H2-TPR were carried out. The results indicated that the catalyst had large surface area and the active sites were well dispersed on the surface. The NH3-TPD, H2-TPR and XPS results implied that its increased SCR activity might be due to the enhancement of NH3 chemisorption and the increase of active oxygen species, both of which were conductive to NH3 activation. The excellent catalytic performance suggests that it is a promising candidate for SCR catalyst. 展开更多
关键词 SCR Core-shell SO2 resistance CeO2 TiO2
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Preparation and photocatalytic activity of laponite pillared by CeO_2 modified TiO_2 认领 引用 被引量:6
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作者 林英光 皮丕辉 +2 位作者 郑大锋 杨卓如 王炼石 《Journal of Rare Earths》 SCIE EI CAS 2010年第5期732-736,共5页
The laponite pillared by the CeO2 modified TiO2 (Ce-Ti-lap) were prepared by microwave intercalation reaction with laponite as the layered clay, tetrabutyl titanate and cerium chloride as the Ce-Ti composite pillaring... The laponite pillared by the CeO2 modified TiO2 (Ce-Ti-lap) were prepared by microwave intercalation reaction with laponite as the layered clay, tetrabutyl titanate and cerium chloride as the Ce-Ti composite pillaring agent, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brumauer-Emmett-Teller (BET) surface area. The photocatalytic activities of Ce-Ti-lap were investigated by the degradation of methyl orange (MO). The results showed that Ce and Ti could be introduced to... 展开更多
关键词 CeO2 modified TiO2 pillared laponite photocatalytic activity microwave intercalation reaction rare earths
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CeO_2掺杂TiO_2光催化剂的性能研究 认领 引用 被引量:6
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作者 奚丽荷 江海军 +2 位作者 朱忠其 张瑾 柳清菊 《功能材料》 EI CAS 北大核心 2007年第7期1146-1148,共3页
采用液相合成法制备CeO2掺杂TiO2光催化粉体,利用X射线衍射仪、紫外-可见分光光度计、FT-IR傅里叶变换红外光谱仪等对粉体的晶相组成、光谱吸收性能进行了表征,结果表明,掺杂后的TiO2经800℃热处理后仍呈锐钛矿型;CeO2/TiO2吸收光谱的... 采用液相合成法制备CeO2掺杂TiO2光催化粉体,利用X射线衍射仪、紫外-可见分光光度计、FT-IR傅里叶变换红外光谱仪等对粉体的晶相组成、光谱吸收性能进行了表征,结果表明,掺杂后的TiO2经800℃热处理后仍呈锐钛矿型;CeO2/TiO2吸收光谱的阈值波长发生红移,但Ce掺杂浓度的增大对粉体的可见光吸收影响不大。光催化降解甲醛的结果表明,粉体在普通日光灯下对甲醛气体的降解率明显优于P25。 展开更多
关键词 光催化 TiO2 CeO2掺杂 甲醛降解
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CeO_2/TiO_2对P_2O_5-B_2O_3-ZnO玻璃的结构和性能的影响 认领 引用 被引量:4
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作者 王振林 廖思佳 +1 位作者 杜云南 周明 《重庆理工大学学报(自然科学)》 CAS 北大核心 2018年第8期108-114,共7页
采用熔融冷却法制备含不同CeO_2/TiO_2的P2O5-B2O3-Zn O玻璃,应用X射线衍射法、激光拉曼光谱法、分光光度法和热水浸泡法分别对玻璃的结构、光学性质、化学稳定性进行了表征。结果表明:CeO_2作为网络改性体使PO_4网络解聚;TiO_2部分作... 采用熔融冷却法制备含不同CeO_2/TiO_2的P2O5-B2O3-Zn O玻璃,应用X射线衍射法、激光拉曼光谱法、分光光度法和热水浸泡法分别对玻璃的结构、光学性质、化学稳定性进行了表征。结果表明:CeO_2作为网络改性体使PO_4网络解聚;TiO_2部分作为网络形成体以四面体形式参与网络构建,部分作为网络改性体使网络解聚;掺入CeO_2/TiO_2使玻璃吸收边红移;CeO_2对可见光透过率影响比TiO_2小;TiO_2由于Ti3+的存在使可见光区产生显著光吸收;掺CeO_2/TiO_2可明显提高玻璃的化学稳定性;CeO_2对化学稳定性的改善作用比TiO_2大。 展开更多
关键词 磷酸盐玻璃 氧化铈 氧化钛
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TiO_2掺杂CeO_2催化超声降解甲基橙 认领 引用 被引量:5
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作者 郭玉玮 丁永萍 +1 位作者 聂鲁 刘兴旺 《稀土》 CAS CSCD 北大核心 2012年第5期50-53,共4页
以合成TiO2掺杂CeO2作为催化剂,以超声降解甲基橙反应为模型,研究了各种因素对TiO2掺杂CeO2催化超声降解甲基橙溶液的影响。结果表明,在TiO2(掺杂CeO2)催化剂作用下超声降解甲基橙的效果明显优于单纯以锐钛矿型TiO2催化时的情况。TiO2(... 以合成TiO2掺杂CeO2作为催化剂,以超声降解甲基橙反应为模型,研究了各种因素对TiO2掺杂CeO2催化超声降解甲基橙溶液的影响。结果表明,在TiO2(掺杂CeO2)催化剂作用下超声降解甲基橙的效果明显优于单纯以锐钛矿型TiO2催化时的情况。TiO2(掺杂CeO2)用量为0.5 g/L~1.0 g/L、超声波频率为25 kHz、输出功率为1.0 W/cm2、pH值为1.0~3.0时,初始浓度为20 mg/L的甲基橙水溶液在80 min左右基本可降解完全,COD的去除率达到了99.0%。 展开更多
关键词 甲基橙 超声降解 TiO2掺杂CeO2
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Promotional effects of Er incorporation in CeO_2(ZrO_2)/TiO_2 for selective catalytic reduction of NO by NH_3 认领 引用 被引量:11
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作者 Qijie Jin Yuesong Shen +2 位作者 Shemin Zhu Xihong Li Min Hu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第9期1521-1529,共9页
A series CeO2(ZrO2)/TiO2 catalysts were modified with Er using a sol-gel method.The catalytic activity of the obtained catalysts in the selective catalytic reduction(SCR) of NO with NH3 was investigated to determi... A series CeO2(ZrO2)/TiO2 catalysts were modified with Er using a sol-gel method.The catalytic activity of the obtained catalysts in the selective catalytic reduction(SCR) of NO with NH3 was investigated to determine the appropriate Er dosage.The catalysts were characterized using X-ray diffraction,N2 adsorption,NH3 temperature-programmed desorption,H2 temperature-programmed reduction,photoluminescence spectroscopy,electron paramagnetic resonance spectroscopy,and X-ray photoelectron spectroscopy.The results showed that the optimum Er/Ce molar ratio was 0.10;this catalyst had excellent resistance to catalyst poisoning caused by vapor and sulfur and gave more than 90% NO conversion at 220–395 ℃ and a gas hourly space velocity of 71 400 h^-1.Er incorporation increased the Ti^3+ concentrations,oxygen storage capacities,and oxygen vacancy concentrations of the catalysts,resulting in excellent catalytic performance.Er incorporation also decreased the acid strength and inhibited growth of TiO2 and CeO2 crystal particles,which increased the catalytic activity.The results show that high oxygen vacancy concentrations and oxygen storage capacities,large amounts of Ti^3+,and low acid strengths give excellent SCR activity. 展开更多
关键词 CeO2(ZrO2)/TiO2 Erbium incorporation Selective catalytic reduction Nitrogen oxide Catalytic performance
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掺杂CeO_2的TiO_2光催化降解甲醛的研究 认领 引用 被引量:4
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作者 奚丽荷 朱忠其 +3 位作者 江海军 张瑾 柳清菊 杨喜昆 《功能材料》 EI CAS 北大核心 2007年第11期1762-1765,共4页
采用液相合成法制备CeO2改性TiO2光催化粉体,利用X射线衍射仪、紫外-可见分光光度计、X射线光电子能谱等对粉体的晶相组成、光谱吸收性能等进行了表征,结果表明:改性后的TiO2经800℃热处理后仍呈锐钛矿结构;CeO2/TiO2吸收光谱的阈值波... 采用液相合成法制备CeO2改性TiO2光催化粉体,利用X射线衍射仪、紫外-可见分光光度计、X射线光电子能谱等对粉体的晶相组成、光谱吸收性能等进行了表征,结果表明:改性后的TiO2经800℃热处理后仍呈锐钛矿结构;CeO2/TiO2吸收光谱的阈值波长红移至450nm;改性后TiO2表面的化学吸附氧含量增加。光催化降解甲醛的结果表明,粉体在普通日光灯下对甲醛气体的降解率明显优于P25。 展开更多
关键词 光催化 TiO2 CeO2 改性 甲醛降解
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BaO-CeO_2-TiO_2微波介质陶瓷的烧结特性及物相组成 认领 引用 被引量:2
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作者 周东祥 余晓华 +1 位作者 王鹤 赵俊 《无机材料学报》 SCIE EI CAS 北大核心 2007年第6期1197-1200,共4页
采用TG-DTA、SEM、EDAX、XRD等测试手段研究了BaO-CeO_2-TiO_2微波介质陶瓷的烧结特性及物相组成.BaO-CeO_2-TiO_2的预烧温度和烧结温度分别为900~1100℃和1250~1300℃.结果表明:Ba6-3xCe8+2xTi18O54(x=0.8)在1300℃下烧... 采用TG-DTA、SEM、EDAX、XRD等测试手段研究了BaO-CeO_2-TiO_2微波介质陶瓷的烧结特性及物相组成.BaO-CeO_2-TiO_2的预烧温度和烧结温度分别为900~1100℃和1250~1300℃.结果表明:Ba6-3xCe8+2xTi18O54(x=0.8)在1300℃下烧结后形成了由A、B两相共存的体系,其中A、B两相的元素摩尔比分别为Ce:O=1.0:1.3,Ba:Ti:Ce:O=1.00:6.70:0.35:9.46.此时体系的介电常数为28.72,品质因数为最高值4862.13GHz. 展开更多
关键词 微波介质陶瓷 BaO—CeO2-TiO2 物相组成
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