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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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Characterization and Preparation of Ce-Zr-O Solid Solution 认领 引用 被引量：2
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作者 罗孟飞 周碧 +3 位作者 林瑞 陈敏 袁贤鑫 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2000年第4期275-278,共4页
Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffractio... Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffraction, Raman and temperature programmed reduction. The phase composition and the reduction properties of Ce Zr O depend on the preparation method. A cubic Ce 0.5 Zr 0.5 O 2 solid solution can be obtained by using the sol gel method. The Ce Zr O solid solution prepared by using decomposition or coprecipiation was composed of cubic Ce 0.8 Zr 0.2 O 2 and tetragonal Ce 0.2 Zr 0.8 O 2 solid solution. The Ce Zr O solid solution prepared with different methods shows the different reduction properties owing to different phase composition. Results of differential thermal analysis and XRD show that Ce 0.5 Zr 0.5 O 2 solid solution is formed during the decomposition or combustion of the gel. 展开更多
关键词 rare earths Ce 0.5 Zr 0.5 O 2 solid solution X ray powder diffraction Raman temperature programmed reduction
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Effect of PdOx structure properties on catalytic performance of Pd/Ce0.67Zr0.33O2 catalyst for CO,HC and NOx elimination 认领 引用 被引量：4
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作者 Ting Wang Xiaolin Guo +1 位作者 Siyu Lin Renxian Zhou 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第7期706-713,共8页
Pd/Ce0.67Zr0.33O2 catalyst was pretreated in different atmosphere respectively, and characterized by CO chemical adsorption, XPS, HR-TEM, H2-TPR, Raman, OSC and in situ DRIFTS to investigate the effect of the structur... Pd/Ce0.67Zr0.33O2 catalyst was pretreated in different atmosphere respectively, and characterized by CO chemical adsorption, XPS, HR-TEM, H2-TPR, Raman, OSC and in situ DRIFTS to investigate the effect of the structure properties of PdOx species on the catalytic performance for CO, HC and NOx elimination. The results show that Pd/CZ catalyst pretreated in air atmosphere has higher oxidation activity of HC due to having high Pd dispersion and strong interaction between PdOx and CZ support. Pd/CZ-H catalyst pretreated in reducing atmosphere exhibits better catalytic performance of NOx elimination because of having relatively big Pd particle size, more Pd species in metallic state and higher concentration of oxygen vacancies. While for the Pd/CZ-RG catalyst pretreated in reactant atmosphere, strong adsorption of HC species on the surface of catalysts would lead to a part of active sites being covered, which inhibits HC and NO conversions. 展开更多
关键词 Pretreatment atmosphere Structure properties of PdOx species Pd/Ce0.67Zr0.33O2 catalyst TWCs performance Rare earths
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制备方法对Ce0.67Zr0.33O2固溶体性能的影响 认领 引用 被引量：1
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作者 杨沙沙 金银龙 +2 位作者 张利军 王育 王国清 《当代化工》 CAS 2017年第5期800-803,807,共4页
用氧化共沉淀法、均匀共沉淀法和柠檬酸溶胶-凝胶法制备了Ce0.67Zr0.33O_2固溶体,并将经和900℃焙烧后的固溶体进行了XRD、BET、Raman、H_2-TPR和储氧量(OSC)表征。结果表明,氧化共沉淀法和柠檬酸溶胶-凝胶法制备的Ce0.67Zr_(0... 用氧化共沉淀法、均匀共沉淀法和柠檬酸溶胶-凝胶法制备了Ce0.67Zr0.33O_2固溶体,并将经和900℃焙烧后的固溶体进行了XRD、BET、Raman、H_2-TPR和储氧量(OSC)表征。结果表明,氧化共沉淀法和柠檬酸溶胶-凝胶法制备的Ce0.67Zr0.33O_2固溶体的储氧量、比表面积均高于均匀共沉淀法,且制备的固溶体经900℃焙烧4 h后未出现相分离,具有良好的热稳定性。 展开更多
关键词 氧化共沉淀法 溶胶-凝胶法 Ce0.67Zr0.33O2固溶体 储氧量
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Doping of Ceria-Zirconia Solid Solution with Rare-earth Elements 认领 引用
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作者 HU Yu-cai FENG Chang-gen WANG Li-qiong WANG Ya-jun 《合成化学》 CAS 2004年第Z1期136-136,共1页
关键词 ceria-zirconia solid solution, doping, Ce0.6Zr0.3M0.1O2 (M=Y, La, Pr, Tb), three- way catalyst
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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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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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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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Study on methane selective catalytic reduction of NO on Pt/Ce0.67Zr0.33O2and its application 认领 引用 被引量：10
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作者 Zhimin Liu Kangcai Wang +4 位作者 Xiaoyu Zhang Jianli Wang Hongyan Cao Maochu Gong Yaoqiang Chen 《Journal of Natural Gas Chemistry》 2009年第1期66-70,共5页
Monolithic catalysts of Pt/La-Al2O3 and Pt/Ce0.67Zr0.3302 were prepared to investigate methane selective catalytic reduction(SCR)of NO.The results indicate that Pt/Ce0.67Zr0.33O2 shows high activity and both NO and CH... Monolithic catalysts of Pt/La-Al2O3 and Pt/Ce0.67Zr0.3302 were prepared to investigate methane selective catalytic reduction(SCR)of NO.The results indicate that Pt/Ce0.67Zr0.33O2 shows high activity and both NO and CH4 can be converted completely at 450℃.Meanwhile,NO and CH4 can be converted completely when there exists excess oxygen.The Pt/Ce0.67Zr0.33O2 catalyst were further investigated by using methane as reducing agent to SCR NO in a novel equipment which combined the CH4 selective catalytic reduction of NO with methane combustion.The result shows that the catalyst is high active and the novel equipment is very effective.The conversion of NO is above 92%under the conditions used in this work.The prepared burner and catalysts have great potential for application. 展开更多
关键词 Pt/Ce0.67Zr0.33O2 selective catalytic reduction NO catalytic burner application
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Effect of Fe_2O_3 Loading Amount on Catalytic Properties of Monolithic Fe_2O_3/Ce0.67Zr0.33O_2-Al_2O_3 Catalyst for Methane Combustion 认领 引用 被引量：4
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作者 刘志敏 陈耀强 +3 位作者 钟俊波 王健礼 闫生辉 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第5期585-589,共5页
Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal lo... Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal loading amount of Fe2O3 on Ce0.67Zr0.33 O2-Al2O3 in our experimental condition for catalytic combustion of methane was 8% （ mass fraction）. The prepared catalysts were characterized by BET, TPR, XRD analyses, and their catalytic activity was investigated after being calcined at 873 K and after being aged in water gas at 1273 K. When the loading amount of Fe203 was 8% （ mass fraction）, the catalyst held the highest activity, and the best temperature speciality and thermal stability. The complete-conversion temperature of methane for fresh and aged sample was 788 and 838 K, respectively. The range between the light-off temperature and the complete-conversion temperature was only 15 K. The characterization results of XRD indicated that Fe2O3 was well dispersed on the Ce0.67Zr0.33O2-Al2O3 matrix. The results of BET and TPR were in good harmony with the catalytic activity results. 展开更多
关键词 Ce0.67Zr0.33O2 -Al2O3, Fe2O3-based monolithic catalyst catalytic methane combustion catalytic properties
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Steam effects over Pd/Ce0.67Zr0.33O_2-Al_2O_3 three-way catalyst 认领 引用 被引量：2
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作者 王建强 沈美庆 +3 位作者 王军 高继东 马杰 刘双喜 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第8期748-752,共5页
Ceria-zirconia-alumina （CZA） solid solution was prepared by sol-gel method in the present study. 0.5 wt.% Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C3H8 oxidati... Ceria-zirconia-alumina （CZA） solid solution was prepared by sol-gel method in the present study. 0.5 wt.% Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C3H8 oxidation, three-way catalytic activity and stoichiometric window property were studied. The light-off temperature of the CO oxidation reaction shifted to a lower temperature due to the water-gas shift （WGS） reactions. The oxidation of C3H8 was enhanced due to the steam reforming （SR） reactions. The steam promoted the C3H8 oxidation and NO reduction in three-way catalytic reaction. The amplitude of stoichiometric window was amplified by the addition of water to the feed stream. 展开更多
关键词 Pd/Ce0.67Zr0.33O2-Al2O3 three-way catalytic activity water-gas shift steam reforming stoichiometric window rare earths
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Synthesis and characterization of wormhole-like mesoporous Ce0.6Zr0.35Y0.05O2solid solutions 认领 引用 被引量：6
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作者 WANG GuoZhi ZHANG Lei +3 位作者 DENG JiGuang DAI HongXing HE Hong ZI XueHong 《Chinese Science Bulletin》 2007年第2期175-180,共6页
Nanoparticles of Ce0.6Zr0.35Y0.05O2(CZY)solid solution have been prepared by the CTAB(hexadecyl-trimethyl ammonium bromide),CTAB-EG(ethylene glycol)templating,and CTAB-EG-NaCl(in which the pores of the precursor synth... Nanoparticles of Ce0.6Zr0.35Y0.05O2(CZY)solid solution have been prepared by the CTAB(hexadecyl-trimethyl ammonium bromide),CTAB-EG(ethylene glycol)templating,and CTAB-EG-NaCl(in which the pores of the precursor synthesized by the CTAB-EG method is filled by a certain amount of NaCl)method,respectively.The physical properties of these materials were characterized by means of tech-niques such as X-ray diffraction(XRD),high resolution scanning electron microscopy(HRSEM),transmission electron microscopy(TEM),selected area electron diffraction(SAED),and N2 adsorp-tion-desorption measurements.The CZY samples synthesized by the above three methods display wormhole-like mesoporous morphology and cubic crystal structures.The materials are narrow in pore size distribution(averaged pore diameter=5.3―7.1 nm),high in surface areas(95―119 m2/g),and large in pore volumes(0.16―0.18 cm3/g).It has been demonstrated that the introduction of NaCl is capable of retaining the pore structures of solid nanomaterials at high-temperature calcination. 展开更多
关键词 Ce0.5Zr0.35Y0.05O2 solid solution templating synthesis method wormhole-like mesoporous framework NaCl filler rare earth
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