期刊文献+

Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst 被引量:3

Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst
下载PDF
导出
摘要 CZO (CeO2-ZrO2) and CZYO (CeO2-ZrO2-Y2O3) series of mixed oxides were prepared by coprecipitaion, and a part of these oxides were loaded with precious metals (PM). XRD, BET, and oxygen storage capacity (OSC) investigations were performed on samples aged at 750, 900, and 1050 ℃. It was observed that BET surface area and OSC showed a marked decrease in CeO2 aged at high temperature, and the erystallite size showed an obvious increase. The CZO samples consist of cubic- and tetragonal crvstal phases, and their crystallite size increase rapidly when aged at high temperature. The CZYO samples consist of single crystal phase when the content of Y exceeds 0.15 mol, and their erystallite size increases slowly during high-temperature aging. It is concluded that additive Y can stabilize the performance of CZYO oxides. In the aged CZO and CZYO mixed-oxide systems, addition of a small amount of precious metals (Pt, Pd, Rh) increased the rate of reduction and led to an obvious improvement in OSC. OSC of CZO and CZYO with precious metals are related to their composition and the type of precious metal. CZO (CeO2-ZrO2) and CZYO (CeO2-ZrO2-Y2O3) series of mixed oxides were prepared by coprecipitaion, and a part of these oxides were loaded with precious metals (PM). XRD, BET, and oxygen storage capacity (OSC) investigations were performed on samples aged at 750, 900, and 1050 ℃. It was observed that BET surface area and OSC showed a marked decrease in CeO2 aged at high temperature, and the erystallite size showed an obvious increase. The CZO samples consist of cubic- and tetragonal crvstal phases, and their crystallite size increase rapidly when aged at high temperature. The CZYO samples consist of single crystal phase when the content of Y exceeds 0.15 mol, and their erystallite size increases slowly during high-temperature aging. It is concluded that additive Y can stabilize the performance of CZYO oxides. In the aged CZO and CZYO mixed-oxide systems, addition of a small amount of precious metals (Pt, Pd, Rh) increased the rate of reduction and led to an obvious improvement in OSC. OSC of CZO and CZYO with precious metals are related to their composition and the type of precious metal.
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第1期6-10,共5页 稀土学报(英文版)
基金 Projects supported by the National"973"Project (2004CB719503) "863"Project (2004AA649400) National Natural Science Foundation of China (50502023)
关键词 CEO2 CZO CZYO rare earths oxygen storage capacity precious metal CeO2 CZO CZYO rare earths oxygen storage capacity precious metal
  • 相关文献

参考文献5

二级参考文献24

  • 1刘轩.新闻聚合服务理念下新闻编辑的角色转型研究[J].新闻传播,2020(16):115-116. 被引量:5
  • 2李佩珩,傅昕,魏众,阎红.镧、铈稀土氧化物对三效催化剂性能的影响[J].中国稀土学报,2002,20(z1):54-57. 被引量:1
  • 3缪建英 杨乐夫.催化制备技术基础[M].杭州:杭州大学出版社,1997..
  • 4[1]Juan R González-Velasco, Miguel A Gutiérrez-Ortiz, Jean-Louis Marc, et al. Contribution of cerium/zirconium mixed oxides to the activity of a new generation of TWC [J]. Applied Catalysis B: Environmental, 1999, 22: 167.
  • 5[2]Toshiyuki Masui, Tetsuya Ozaki, Ken-ichi Machida, et al. Preparation of ceria-zirconia sub-catalysts for automotive exhaust cleaning [J]. Journal of Alloys and Compounds, 2000, 303-304: 49.
  • 6[3]Juan R González-veasco. Effects of redox thermal treatments and feedstream composition on the activity of Ce/Zr mixeds for TWC applications [J]. Applied Catalysis B, Environmental 25, 2000. 19.
  • 7[4]Daniela Terrible. The preparation of high surface area CeO2-ZrO2 mixed oxides by a surfactant-assisted approach [J]. Catalysis Today, 1998, 43: 79.
  • 8[1]Alessandro Trovarelli, Carla de Leitenburg, Marta Boaro, et al. The utilization of ceria in industrial catalysis [J]. Catalysis Today, 2000, 50:353.
  • 9[2]Catherine Janvier, Michele Pijolat, Francoise Valdivieso, et al. Thermodynamic description of the nonstoichiomertric defect structure in Ce1-xZrxO2 solid solution powers [J]. Solid State Ionics, 2000, 27:207.
  • 10[3]Toshiyuki Masui, Tetsuya Ozaki, Ken-ichi Machida, et al. Effect of surface modification by chemical filing on the redox behavior of a ceria-zircinia mixed oxide [J]. Jonral of Alloys and Compounds, 1999, 292:8.

共引文献100

同被引文献8

  • 1Kaspar J, Fomasiero P, Hickey N. Automotive catalytic converters: current status and some perspectives [ J ]. Catal Today, 2003, 77 (4) : 419^49.
  • 2Kanazawa T. Development of hydrocarbon adsorbents, oxygen storage materials for three — way catalysts and NOx storage - reduction catalyst [ J ]. Catal Today, 2004, 96 (3) ; 171-177.
  • 3Wu X D,Xu L H,W D. The thermal stability and catalytic performance of Ce - Zr promoted Rh - Pd/g -Al2 O3 automotive catalysts [ J ]. Appl Surf Sci,2004, 221 (14) : 375-383.
  • 4Pira A, TrovarelIi A, Dolcetti G. Remarkable stabilization of transition alumina operated by cera under reducing and redox conditions [ J ]. Appl Catal B, 2000, 28, L77-L81.
  • 5Marta B,Michela V, Carla D L et al. The use of temperature programmed and dynamic/transient methods in catalysis : characterization of ceria - based, model three -way catalysts : CataT Today, 2003, 77(4) : 407-417.
  • 6李红梅,周菊发,祝清超,曾少华,魏振玲,陈耀强,龚茂初.共沉淀法制备的CeO2-ZrO2-Al2O3材料及性能[J].高等学校化学学报,2009,30(12):2484-2486. 被引量:10
  • 7Zihao Li,Yang Geng,Lei Ma,Xiaoyin Chen,Junhua Li,Huazhen Chang,Johannes W.Schwank.Catalytic oxidation of CO over Pt/Fe3O4 catalysts:Tuning O2 activation and CO adsorption[J].Frontiers of Environmental Science & Engineering,2020,14(4):115-123. 被引量:4
  • 8杨振明,张劲松,曹小明,李峰,徐志军.用柠檬酸溶胶-凝胶法制备三效催化剂[J].材料研究学报,2003,17(4):370-374. 被引量:10

引证文献3

二级引证文献5

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部