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制备方法对CuO-Ce0.7Zr0.3O2催化剂的氧缺位和CO氧化活性的影响 认领 引用 被引量：5
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作者 洪庆红 宋宇鹏 +2 位作者 贾爱平 普志英 罗孟飞 《分子催化》 北大核心 2008年第5期429-433,共5页
采用溶胶-凝胶法和溶胶-凝胶+浸渍法两种方法制备了CuO-Ce0.7Zr0.3O2催化剂,并对催化剂进行了XRD、Raman等表征,考察了催化剂的CO氧化性能.研究结果表明,溶胶-凝胶法制备的CuO-Ce0.7Zr0.3O2催化剂的CO氧化活性明显高于溶胶-凝胶+浸渍法... 采用溶胶-凝胶法和溶胶-凝胶+浸渍法两种方法制备了CuO-Ce0.7Zr0.3O2催化剂,并对催化剂进行了XRD、Raman等表征,考察了催化剂的CO氧化性能.研究结果表明,溶胶-凝胶法制备的CuO-Ce0.7Zr0.3O2催化剂的CO氧化活性明显高于溶胶-凝胶+浸渍法制备的CuO/Ce0.7Zr0.3O2催化剂,CuO-Ce0.7Zr0.3O2催化剂容易形成氧缺位和表面高分散CuO的颗粒较大,从而提高催化活性. 展开更多
关键词 CuO-Ce0.7Zr0.3O3催化剂 分散度 氧缺位 CO氧化
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Catalytic combustion study of soot on Ce0.7Zr0.3O_2 solid solution 认领 引用 被引量：4
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作者 方萍 鲁继青 +1 位作者 肖小燕 罗孟飞 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期250-253,共4页
The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD result... The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr^4＋ had replaced part of Ce^4＋ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main HE consumption for Ce0.7Zr0.3O2：CeO2 was 4.4：1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 ℃, which was 200 ℃ lower than that of the single soot. The good catalytic activity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then improved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x meanwhile, after oxygenation, the Ce0.7Zr0.3O2.x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed： the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2. 展开更多
关键词 Ce0.7Zr0.3O2 reoxidizing-reducing soot combustion catalytic activity rare earths
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制备方法对15%CuO-Ce0.7Zr0.3O_2催化剂的氧缺位和CO氧化活性的影响 认领 引用
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作者 洪庆红 林鸿 +1 位作者 宋宇鹏 吴昌胜 《金华职业技术学院学报》 2009年第3期49-53,共5页
采用溶胶-凝胶法和溶胶-凝胶+浸渍法两种方法制备了CuO-Ce0.7Zr0.3O2催化剂,并对催化剂进行了XRD、Raman等表征,考察了催化剂的CO氧化性能。研究结果表明,溶胶-凝胶+浸渍法制备的CuO/Ce0.7Zr0.3O2催化剂CO氧化活性明显高于溶胶-凝胶法... 采用溶胶-凝胶法和溶胶-凝胶+浸渍法两种方法制备了CuO-Ce0.7Zr0.3O2催化剂,并对催化剂进行了XRD、Raman等表征,考察了催化剂的CO氧化性能。研究结果表明,溶胶-凝胶+浸渍法制备的CuO/Ce0.7Zr0.3O2催化剂CO氧化活性明显高于溶胶-凝胶法制备的CuO-Ce0.7Zr0.3O2催化剂的性能,CuO-Ce0.7Zr0.3O2催化剂表面CuO分散度高,从而提高催化活性。 展开更多
关键词 CuO-Ce0.7Zr0.3O2催化剂 分散度 氧缺位 CO氧化
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La_2(Zr0.7Ce0.3)_2O_7——新型高温热障涂层 认领 引用 被引量：18
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作者 牟仁德 许振华 +2 位作者 贺世美 何利民 曹学强 《材料工程》 EI CAS 北大核心 2009年第7期67-71,78,共5页
采用电子束物理气相沉积技术(EB-PVD)制备了新型La2(Zr0.7Ce0.3)2O7(LZ7C3)热障涂层。研究了涂层的组分、显微结构、表面和横截面形貌以及恒温氧化行为。结果表明:涂层中La2O3/ZrO2/CeO2的相对含量偏离了化学计量比,但X射线衍射(XRD)相... 采用电子束物理气相沉积技术(EB-PVD)制备了新型La2(Zr0.7Ce0.3)2O7(LZ7C3)热障涂层。研究了涂层的组分、显微结构、表面和横截面形貌以及恒温氧化行为。结果表明:涂层中La2O3/ZrO2/CeO2的相对含量偏离了化学计量比,但X射线衍射(XRD)相结构与靶材非常相似。通过CeO2掺杂后,LZ7C3体材料的热膨胀系数比La2Zr2O7(LZ)大;在1100℃恒温氧化890h的条件下,LZ7C3涂层的抗氧化增重性能明显优于传统的Y2O3部分稳定化的ZrO2(8YSZ)涂层。此外,热膨胀不匹配、黏结层氧化和陶瓷涂层内部微观裂纹的出现可能是导致LZ7C3涂层恒温氧化失效的主要原因。 展开更多
关键词 热障涂层 EB-PVD 等温氧化 La2(Zr0.7Ce0.3)2O7
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Electrochemical performance of Li-rich cathode material,0.3Li_2MnO_3-0.7LiMn1/3Ni1/3Co1/3O_2 microspheres with F-doping 认领 引用 被引量：18
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作者 Ting Liu Shi-Xi Zhao +2 位作者 Lu-Lu Gou Xia Wu Ce-Wen Nan 《Rare Metals》 SCIE EI CAS CSCD 2019年第3期189-198,共10页
Layered F-doped cathode materials 0.3 Li_2 MnO_3-0.7 LiMn1/3Ni1/3CO1/3)O2-xF_x(x = 0, 0.01, 0.02, 0.03, 0.04,0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation me... Layered F-doped cathode materials 0.3 Li_2 MnO_3-0.7 LiMn1/3Ni1/3CO1/3)O2-xF_x(x = 0, 0.01, 0.02, 0.03, 0.04,0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation method. The sample of x = 0.02 demonstrates a large discharge capacity of226 mAh g-1 over 100 cycles at 0.1 C and excellent rate performance with discharge capacity of 96 mAh g-1 at 5.0 C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 ℃. It delivers a quite high discharge capacity of 233.7 mAh·g-1 at 1.0 C with capacity retention as high as 97.9% after 100 cycles. The results demonstrate that the fluorine incorporation stabilizes the cathode structure and maintains stable interfacial resistances. 展开更多
关键词 Lithium-ion battery Cathode materials 0.3Li2MnO3-0.7LiMn1/3Ni1/3Co1/3O2-xFx F-doped
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(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7:A novel high-entropy ceramic with low thermal conductivity and sluggish grain growth rate 认领 引用 被引量：63
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作者 Zifan Zhao Huimin Xiang +2 位作者 Fu-Zhi Dai Zhijian Peng Yanchun Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第11期2647-2651,共5页
Fine grains and slow grain growth rate are beneficial to preventing the thermal stress-induced cracking and thermal conductivity increase of thermal barrier coatings.Inspired by the sluggish diffusion effect of high-e... Fine grains and slow grain growth rate are beneficial to preventing the thermal stress-induced cracking and thermal conductivity increase of thermal barrier coatings.Inspired by the sluggish diffusion effect of high-entropy materials,a novel high-entropy(HE)rare-earth zirconate solid solution(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 was designed and successfully synthesized in this work.The as-synthesized(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 is phase-pure with homogeneous rare-earth element distribution.The thermal conductivity of as-synthesized(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 at room temperature is as low as 0.76 W m^-1 K^-1.Moreover,after being heated at 1500℃for 1-18 h,the average grain size of(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2 Zr2 O7 only increases from 1.69μm to 3.92μm,while the average grain size of La2Zr2O7 increases from 1.96μm to 8.89μm.Low thermal conductivity and sluggish grain growth rate indicate that high-entropy(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7 is suitable for application as a thermal barrier coating material and it may possess good thermal stress-induced cracking resistance. 展开更多
关键词 (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)2Zr2O7 High-entropy ceramics Thermal barrier coatings Slow grain growth rate
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Effect of template on catalytic performance of La0.7Ce0.3Ni0.7Fe0.3O_3 for ethanol steam reforming reaction 认领 引用 被引量：5
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作者 Ping Yang Ning Li +2 位作者 Junjiang Teng Jian Wu Hao Ma 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第6期594-601,共8页
Perovskite-type oxides La0.7Ce0.3Ni0.7Fe0.3O_3(LCNF) were synthesized by polystyrene colloidal crystal templating(LCNF-CCT) and polystyrene polymer templating(LCNF-PS) through co-precipitation. The structu... Perovskite-type oxides La0.7Ce0.3Ni0.7Fe0.3O_3(LCNF) were synthesized by polystyrene colloidal crystal templating(LCNF-CCT) and polystyrene polymer templating(LCNF-PS) through co-precipitation. The structure and physicochemical properties of the obtained oxides were investigated by scanning electron microscopy, X-ray diffraction, N_2 adsorption-desorption, Fourier transform infrared spectrometry, H_2 temperature-programmed reduction and H_2 temperature-programmed desorption, as well as X-ray photoelectron spectroscopy. The results show that the as-synthesized LCNF-CCT perovskite possesses large specific surface area and regular pore size distribution. In addition, the formation of additional oxygen vacancies on the surface favors the migration of lattice oxygen from the bulk phase to the surface and production of more metallic sites, thus improving the activity and resistance to carbon deposition of catalysts in ethanol steam reforming reaction. 展开更多
关键词 La0.7Ce0.3Ni0.7Fe0.3O3 Polystyrene colloidal crystal templating Polystyrene polymer templating Ethanol steam reforming Catalytic performance Rare earths
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Co/Ce0.5Zr0.5O2催化剂的制备及甲烷部分氧化制合成气 认领 引用 被引量：16
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作者 余长林 胡久彪 +2 位作者 翁维正 周晓春 陈喜蓉 《燃料化学学报》 CSCD 北大核心 2012年第4期418-423,共6页
利用共沉淀法制备了具有介孔结构的Ce0.5Zr0.5O2固溶体载体,然后浸渍不同质量分数(10%、20%、30%)的活性组分钴,制备了系列Co/Ce0.5Zr0.5O2催化剂。利用N2物理吸附(BET)、X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、扫描电子显微镜(... 利用共沉淀法制备了具有介孔结构的Ce0.5Zr0.5O2固溶体载体,然后浸渍不同质量分数(10%、20%、30%)的活性组分钴,制备了系列Co/Ce0.5Zr0.5O2催化剂。利用N2物理吸附(BET)、X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、程序升温氧化(TPO)和热重(TG)等手段对制备和反应后的催化剂进行了表征,研究了它们对甲烷部分氧化制合成气反应的催化性能。研究结果表明,铈锆固溶体负载的钴比较容易被还原,该系列催化剂具有较高的活性和对H2及CO的选择性,且随Co含量的增加,催化剂的活性和对H2和CO的选择性得到提高的同时,也增强了催化剂的抗积炭性能。 展开更多
关键词 Ce0.5Zr0.5O2固溶体 钴 甲烷部分氧化 合成气
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Promoter of (Ce-Zr)O_2 Solid Solution Modified by Praseodymia in Three-Way Catalysts 认领 引用 被引量：4
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作者 汪文栋 林培琰 +4 位作者 孟明 伏义路 胡天斗 谢亚宁 刘涛 《Journal of Rare Earths》 SCIE EI CAS 2003年第4期430-435,共6页
The three way catalysts (TWCs) promoters (Ce Zr)O 2, (Pr Ce Zr)O 2 and (Pr Zr)O 2 were prepared by sol gel like method. They were characterized by XRD, EXAFS and BET surface area determination. The reduction features ... The three way catalysts (TWCs) promoters (Ce Zr)O 2, (Pr Ce Zr)O 2 and (Pr Zr)O 2 were prepared by sol gel like method. They were characterized by XRD, EXAFS and BET surface area determination. The reduction features of the promoters were measured by temperature programmed reduction (TPR) of H 2 to access the potential for the promoters containing praseodymia as oxygen storage component in three way catalyst. The (Pr Zr)O 2 cubic solid solution is formed at high temperature up to 800 ℃, which makes it more reducible than the (Ce Zr)O 2 solid solution. For the (Pr Ce Zr)O 2 samples, the ternary solid solution plays an important role in the reduction process. The performance of the three way catalysts with fully formulated Pt, Pd and Rh is proceeded by using both light off temperature under a stoichiometric gas composition and the conversion of CO, C 3H 6 and NO under changing air/fuel ratio at a constant reaction temperature 400 ℃ . The results indicate that a small amount of praseodymia doping into (Ce Zr)O 2 favors the light off temperature of C 3H 6 and NO, and all the catalysts containing praseodymia obviously exhibits enhanced width of S value for NO conversion at lean region ( S ≥1.00). 展开更多
关键词 catalytic chemistry praseodymium (Ce Zr)O 2 solid solution three way catalysts rare earths
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La_2(Zr0.7Ce0.3)_2O_7纳米粉体的制备与表征 认领 引用 被引量：2
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作者 于方丽 白宇 +4 位作者 张霞 韩朋德 管浩 倪澍 张长森 《人工晶体学报》 EI CAS CSCD 北大核心 2015年第5期1213-1217,共5页
采用化学沉淀法制备了高性能热障涂层用La2（Zr0.7Ce0.3）2O7陶瓷粉体。通过TG-DSC、XRD、SEM及TEM对前驱体的烧结温度、粉体物相及微观结构进行了分析。结果表明：制备的粉体为纳米级,且颗粒分布均匀,粒径大约30-50 nm;La2（Zr0.7Ce0.3... 采用化学沉淀法制备了高性能热障涂层用La2（Zr0.7Ce0.3）2O7陶瓷粉体。通过TG-DSC、XRD、SEM及TEM对前驱体的烧结温度、粉体物相及微观结构进行了分析。结果表明：制备的粉体为纳米级,且颗粒分布均匀,粒径大约30-50 nm;La2（Zr0.7Ce0.3）2O7是由烧绿石结构的La2Zr2O7固溶体和萤石结构的La2Ce2O7固溶体复合组成。 展开更多
关键词 热障涂层 化学沉淀法 固溶体 La2(Zr0.7Ce0.3)2O7
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Preparation of Ce0.65Zr0.35O_2 by co-precipitation: The role of hydrogen peroxide 认领 引用 被引量：5
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作者 黄利华 陈山虎 +2 位作者 朱艺 龚茂初 陈耀强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第5期461-469,共9页
The effect of H2O2 on the properties of Ce0.65Zr0.35O2 a mixed aqueous solution of ammonia and was explored by treating cerium nitrate and zirconium nitrate with in the presence/absence of H2O2. The resultant products... The effect of H2O2 on the properties of Ce0.65Zr0.35O2 a mixed aqueous solution of ammonia and was explored by treating cerium nitrate and zirconium nitrate with in the presence/absence of H2O2. The resultant products were characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, nitrogen adsorption/desorption, oxygen storage capacity （OSC） and H2- reduction （H2-TPR）. The presence of H2O2 was found to have profound effect on powder properties such as surface area, crystallite size of the samples. It was also shown that the addition of H2O2 favored the incorporation of Zr4＋ into CeO2 lattice, which facilitated the formation of CeO2-ZrO2 solid solution, and enhanced the thermal stability of the samples. OSC and H2-TPR studies indicated that the use of H2O2 enhanced the OSC and redox properties. Catalytic activity tests showed that as a support, the Ce0.65Zr0.35O2 prepared in the presence of H2O2 was more suitable for three-way catalyst. The corresponding Pd-only three-way catalyst demonstrated outstanding performance： wide air to fuel operation window, low light-off and total conversion temperature for the conversion of C3H8, NO and CO. 展开更多
关键词 solid solution H2O2 oxygen storage capacity three-way catalysts Ce0.65Zr0.35O2 rare earths
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SOFC阳极阻挡层La0.3Ce0.7O2-δ薄膜的制备 认领 引用 被引量：4
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作者 朱晓东 孙克宁 +2 位作者 张乃庆 周德瑞 吴丽军 《人工晶体学报》 EI CAS 北大核心 2006年第6期1242-1246,共5页
镓酸镧基SOFC存在的关键问题是在阳极/电解质界面发生固相反应生成绝缘相,一个根本的解决办法是在阳极与电解质之间制备一层薄且致密的阻挡层La0.3Ce0.7O2-δ(LDC30)。本文采用共沉淀法制备了LDC30的前驱体,高温煅烧后,通过XRD分析和粒... 镓酸镧基SOFC存在的关键问题是在阳极/电解质界面发生固相反应生成绝缘相,一个根本的解决办法是在阳极与电解质之间制备一层薄且致密的阻挡层La0.3Ce0.7O2-δ(LDC30)。本文采用共沉淀法制备了LDC30的前驱体,高温煅烧后,通过XRD分析和粒度分布测试,表明La2O3成功地掺杂到CeO2晶格中,制得了粒径较小的纯相LDC30粉体,并确定了最佳的煅烧条件是在1000℃下煅烧2h。采用丝网印刷法将阻挡层浆料涂覆在电解质表面并高温烧结,通过烧结收缩曲线及微观形貌观测,发现在1400℃时烧结2h可以成功的制备一层厚约10μm的致密的阻挡层薄膜,将电池的放电性能提高了44%。 展开更多
关键词 SOFC 镓酸镧 阻挡层 La0.3Ce0.7O2-δ 微观形貌
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焙烧温度对Ce0.65Zr0.35O_2储氧材料性能的影响 认领 引用 被引量：8
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作者 赵明 余全伟 +3 位作者 蔡黎 龚茂初 刘志敏 陈耀强 《功能材料》 EI CAS 北大核心 2008年第5期793-796,共4页
用共沉淀法制备了Ce0.65Zr0.35O2氧化物,对不同温度处理后的样品进行了XRD、Raman、BET和储氧量(OSC)的表征。并考察了不同温度焙烧后的氧化物对单钯催化剂三效性能的影响。结果表明,焙烧温度的不同,样品具有不同的织构性能,但该样品的... 用共沉淀法制备了Ce0.65Zr0.35O2氧化物,对不同温度处理后的样品进行了XRD、Raman、BET和储氧量(OSC)的表征。并考察了不同温度焙烧后的氧化物对单钯催化剂三效性能的影响。结果表明,焙烧温度的不同,样品具有不同的织构性能,但该样品的晶相结构稳定,老化前后均为立方相的铈锆固溶体,经1000℃焙烧后未出现相分离,说明该氧化物具有良好的热稳定性能;活性测试结果表明,不同焙烧温度的载体对催化活性影响较大,并以700℃焙烧后的氧化物为载体的催化剂具有最好的三效性能。 展开更多
关键词 焙烧温度 Ce0.65Zr0.35O2储氧材料 结构 织构性能 Pb催化剂
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烧结气氛对无钴镍基正极材料LiNi0.7Mn0.3O_2性能的影响 认领 引用 被引量：7
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作者 陈鹏 钟盛文 +3 位作者 梅文捷 刘熙林 金柱 胡经纬 《有色金属科学与工程》 CAS 2015年第4期52-57,共6页
采用共沉淀-高温固相法,控制烧结气氛制备出LiNi0.7Mn0.3O2.借助扫描电子显微镜（SEM）、X射线衍射分析（XRD）、氧气分析仪、电池测试系统及电化学工作站对不同气氛条件下制备的LiNi0.7Mn0.3O2进行结构、形貌、固相反应过程氧气浓度变... 采用共沉淀-高温固相法,控制烧结气氛制备出LiNi0.7Mn0.3O2.借助扫描电子显微镜（SEM）、X射线衍射分析（XRD）、氧气分析仪、电池测试系统及电化学工作站对不同气氛条件下制备的LiNi0.7Mn0.3O2进行结构、形貌、固相反应过程氧气浓度变化、电性能和内阻的表征.研究结果表明,烧结过程存在2次明显吸氧阶段且全程通高纯氧制备的材料有更好的球形度,层状结构更完整,充放电性能及循环稳定性都更好,内阻也较小;在2.75~4.35V电压范围内,以0.2C进行充放电,其首次放电比容量高达191.0mAh/g,70周循环后容量保持率为95.2%.烧结过程中由一种气氛切换为另一种气氛比烧结全程不通气或通空气所制备材料的性能差,但其首次比容量都低于184.0mAh/g,70周循环后的容量保持率也都不足85.0%. 展开更多
关键词 气氛 LiNi0.7Mn0.3O2 无钴 共沉淀 锂离子电池
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复合烧结助剂对CSLST微波介质陶瓷的性能影响 认领 引用 被引量：9
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作者 李月明 金云海 +3 位作者 沈宗洋 王竹梅 洪燕 汪启轩 《人工晶体学报》 EI CAS CSCD 北大核心 2012年第5期1221-1226,共6页
研究了复合添加12.5wt%Li2CO3-B2O3-CuO(LBC)玻璃和不同含量(0～4.0wt%)Bi2O3对(Ca0.9375Sr0.0625)0.3(Li0.5Sm0.5)0.7TiO3(CSLST)微波介质陶瓷烧结特性、相组成和介电性能的影响,分析了CSLST陶瓷与银的共烧行为。结果表明:复合添加LBC... 研究了复合添加12.5wt%Li2CO3-B2O3-CuO(LBC)玻璃和不同含量(0～4.0wt%)Bi2O3对(Ca0.9375Sr0.0625)0.3(Li0.5Sm0.5)0.7TiO3(CSLST)微波介质陶瓷烧结特性、相组成和介电性能的影响,分析了CSLST陶瓷与银的共烧行为。结果表明:复合添加LBC玻璃和Bi2O3能有效降低CSLST陶瓷烧结温度至875℃,XRD分析结果显示添加0～1.0wt%Bi2O3有Cu3Ti3O和CaCu3Ti4O12新相产生,当Bi2O3的添加量大于2.0wt%,杂相消失。随着Bi2O3添加量的增加,陶瓷的频率温度系数τf向负方向偏移。复合添加12.5wt%LBC玻璃和2.0wt%Bi2O3的CSLST陶瓷,在875℃保温5 h烧结后,具有优良的微波介电性能:εr=78.9,Q×f=1852 GHz,τf=3×10-6/℃。该材料与银共烧界面结合状况良好,无明显扩散,适合作为LTCC的材料。 展开更多
关键词 (Ca0.9375Sr0.0625)0.3(Li0.5Sm0.5)0.7TiO3陶瓷 Li2CO3-B2O3-CuO玻璃 Bi2O3 液相烧结 微波介电性能
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Ti0.7W0.3O2@BiVO4 p⁃n复合异质结构界面光催化剂的制备及其可见光催化降解苯酚机理的研究 认领 引用 被引量：7
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作者 董泽民 周仁丹 +5 位作者 熊乐艳 李卓 李涵 樊晶 郭赞如 郑龙珍 《环境科学学报》 CAS CSCD 北大核心 2020年第5期1674-1691,共18页
设计并制备了新型Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构界面光催化剂应用于可见光条件下降解模拟含苯酚污染物的废水.采用粉末X射线衍射(PXRD)、扫描电镜(SEM)、固体粉末紫外漫反射(DRS)及X射线光电子能谱(XPS)等技术表征了Ti0.7 W0.3 O2/... 设计并制备了新型Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构界面光催化剂应用于可见光条件下降解模拟含苯酚污染物的废水.采用粉末X射线衍射(PXRD)、扫描电镜(SEM)、固体粉末紫外漫反射(DRS)及X射线光电子能谱(XPS)等技术表征了Ti0.7 W0.3 O2/BiVO4 p⁃n复合异质结构界面的性状.结果显示BiVO4纳米粒子均匀地分布在Ti0.7W0.3O2纳米颗粒周围并构筑了稳定的p⁃n复合异质结构界面.Ti0.7 W0.3 O2/BiVO4 p⁃n复合异质结构界面光催化剂具有更宽的可见光响应范围和更低的能带宽度.纯BiVO4和Ti0.7W0.3O2纳米颗粒的导带位置分别为-0.62 eV和0.56 eV.优化了Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构界面光催化剂降解苯酚的条件(即:pH值为4.5,催化剂用量为0.60 g·L^-1和苯酚初始浓度95 mg·L^-1),质量分数为5%Ti0.7W0.3O2/BiVO4表现出最高的苯酚催化活性且初始降解速率常数(k)为0.01137 min^-1.6次连续光催化降解苯酚后,Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构表现出良好的稳定性和可循环使用性.自由基捕获结果说明3种自由基均参加了苯酚的光催化降解过程中,且氧化能力由强到弱顺序为:羟自由基(·OH^-)>过氧化物自由基阴离子(·O2^-)>光生空穴(h^+).总有机碳结果表明苯酚在降解的过程中是先产生了中间降解产物,最后这些中间产物再矿化为无机的CO2和H2O.利用对苯二甲酸(TA)荧光探针证明了Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构界面光催化剂降解苯酚为羟自由基(·OH^-)机理反应;同时,利用紫外⁃可见光谱(UV⁃Vis)和高效液相色谱⁃质谱联用技术(HPLC⁃MS)探究了苯酚的中间降解产物,推测了苯酚在Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构界面上可能的降解机理. 展开更多
关键词 Ti0.7W0.3O2/BiVO4 p⁃n复合异质结构 苯酚 中间产物 光降解机理
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Structure and catalytic property of CeO_2-ZrO_2-Fe_2O_3 mixed oxide catalysts for diesel soot combustion: Effect of preparation method 认领 引用 被引量：8
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作者 顾振华 桑秀丽 +1 位作者 王华 李孔斋 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第9期817-823,共7页
A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods （co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method） and character... A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods （co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method） and characterized by X-ray diffraction （XRD）, Raman spectroscopy, Brunauer-Emmett-Teller （BET） and H2-TPR measurements. Potential of the catalysts in the soot oxidation was evaluated in a temperature-programmed oxidation （TPO） apparatus. The results showed that all the Fe3＋ and Zr4＋ were incor- porated into ceria lattice to form a pure Ce-Fe-Zr-O solid solution for the co-precipitation sample, but two kinds of Fe phases ex- isted in the Ce-Fe-Zr-O catalysts prepared by other methods： Fe3＋ incorporated into CeO2 lattice and dispersed Fe2O3 clusters. The free Fe2O3 clusters could improve the activity of catalysts for soot oxidation comparing with the pure Ce-Fe-Zr-O solid solution owing to the synergetic effect between free Fe2O3 and surface oxygen vacancies. In addition, the activity of catalysts strongly relied on the surface reducibility of free Fe2O3 particles. Holding both abundant free Fe2O3 particles and high oxygen vacancy concentration, the hydrothermal Ce0.5Fe0.3Zr0.202 catalyst presented the lowest Ti （251℃, ignition temperature of soot oxidation） and Tm （310 ℃, maximum oxidation rate temperature） for soot combustion （with tight-contact between soot and catalysts） among the five samples. Even after aging at 800 ℃ for 10 h, the Ti and Tm were still relatively low, at 273 and 361 ℃, respectively, indicating high catalytic stability. 展开更多
关键词 Ce0.5Fe0.30Zr0.20O2 mixed oxides soot combustion solid solution interaction hydrothermal method rare earths
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等离子喷涂超高温热障涂层用纳米结构La2(Zr(0.75)Ce(0.25))2O7球形喂料的研究 认领 引用 被引量：8
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作者 周飞飞 刘敏 +2 位作者 邓春明 张小锋 王铀 《表面技术》 EI CAS CSCD 北大核心 2020年第4期98-103,112,共6页
目的通过纳米粉体造粒技术制备出适合热喷涂超高温用纳米结构La2(Zr(0.75)Ce(0.25))2O7球形喂料,进而采用热喷涂方法制备出纳米结构的热障涂层,以满足下一代热障涂层服役温度需求。方法以化学共沉淀法合成的纳米La2(Zr(0.75)Ce(0.25))2O... 目的通过纳米粉体造粒技术制备出适合热喷涂超高温用纳米结构La2(Zr(0.75)Ce(0.25))2O7球形喂料,进而采用热喷涂方法制备出纳米结构的热障涂层,以满足下一代热障涂层服役温度需求。方法以化学共沉淀法合成的纳米La2(Zr(0.75)Ce(0.25))2O7粉末为原料,通过球磨、喷雾干燥及热处理工艺制备出纳米结构的La2(Zr(0.75)Ce(0.25))2O7喂料,进而采用大气等离子喷涂方法制备出纳米结构La2(Zr(0.75)Ce(0.25))2O7热障涂层。利用扫描电镜(SEM)和透射电镜(TEM)对原始纳米粉体、纳米喂料及喷涂态涂层进行显微形貌和组织结构分析。此外,通过电感耦合等离子体原子发射光谱法(ICP-AES)对制备的纳米喂料进行成分分析。结果制备出的纳米结构La2(Zr(0.75)Ce(0.25))2O7喂料表面光滑、呈球形,成分与化学计量比基本一致。相对于原始纳米粉末,喂料晶粒长大并不显著。喷涂态涂层部分晶粒长大,但仍保留纳米结构。结论成功制备出纳米结构La2(Zr(0.75)Ce(0.25))2O7球形喂料及纳米结构热障涂层,有望作为下一代超高温热障涂层材料。 展开更多
关键词 等离子喷涂 超高温 热障涂层 纳米结构 La2(Zr(0.75)Ce(0.25))2O7 球形喂料 造粒
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储氧材料制备过程中的结构及织构变化 认领 引用 被引量：5
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作者 赵明 郭家秀 +5 位作者 刘萍 房华 蔡黎 毛小波 龚茂初 陈耀强 《无机化学学报》 SCIE CAS 北大核心 2006年第6期1123-1126,共4页
Ce0.65Zr0.35O2 solid solution was prepared by co-precipitation method and characterized by X-ray diffraction (XRD), Raman spectra, BET, oxygen storage capacity (OSC) and temperature-programmed reduction measurements (... Ce0.65Zr0.35O2 solid solution was prepared by co-precipitation method and characterized by X-ray diffraction (XRD), Raman spectra, BET, oxygen storage capacity (OSC) and temperature-programmed reduction measurements (H2-TPR) after calcination at 100 ℃, 300 ℃, 600 ℃, and 1 000 ℃. The results showed that the precipitation was a crystalline of fluorite structure, and in the process of the precipitation transformation into Ce0.65Zr0.35O2 solid solution, the fluorite structure of the precipitation kept unchanged. The samples had different BET surface areas and OSC at different temperatures, but they held the performance of stable structure. After 1 000 ℃, there didn′t appear the other crystalline phase. So the samples prepared by co-precipitation method had excellent texture and higher thermal stability. 展开更多
关键词 共沉淀 Ce0.65Zr0.35O2氧化物 同晶转化 织构 结构
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Ce-Zr-O固溶体的制备和表征 认领 引用 被引量：27
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作者 罗孟飞 林瑞 +2 位作者 陈敏 袁贤鑫 郑小明 《中国稀土学报》 CAS 北大核心 2000年第1期35-37,共3页
采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶 凝胶法和柠檬酸溶胶 凝胶法制备了Ce Zr O复合氧化物并进行了表征。溶胶 凝胶法制得的Ce Zr O为立方的Ce0 .5Zr0 .5O2 复合氧化物 (其中少量具有立方性质的t″相 ) ,而直接分解和共沉淀法... 采用硝酸盐直接分解法、共沉淀法、苹果酸溶胶 凝胶法和柠檬酸溶胶 凝胶法制备了Ce Zr O复合氧化物并进行了表征。溶胶 凝胶法制得的Ce Zr O为立方的Ce0 .5Zr0 .5O2 复合氧化物 (其中少量具有立方性质的t″相 ) ,而直接分解和共沉淀法制得的是由立方Ce0 .8Zr0 .2 O2 和四方Ce0 .2 Zr0 .8O2 固溶体组成的复合氧化物。不同制备方法制得的样品由于物相组成不同 ,还原性能也有较大差别。差热分析和X射线衍射分析结果表明 ,凝胶在燃烧的同时生成了Ce0 .5Zr0 .5O2 固溶体。 展开更多
关键词 固溶体 稀土元素 铈锆氧复合物 催化
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