欢迎登录材料期刊网

材料期刊网

高级检索

采用沉积沉淀法制备了Au/CeO2催化剂, 通过N2物理吸附、XRD、H2-TPR和HRTEM等手段研究了焙烧温度对催化剂的织构、物相、还原性能以及WGS反应活性的影响. 结果表明, 焙烧温度对催化剂活性影响显著, 低温焙烧有利于金粒子在载体表面的良好分散, 高温焙烧则会使金粒子在载体表面聚集长大. 选择适中的焙烧温度不仅可以使表面纳米金粒子获得较好的分散, 而且可使Au与载体间具有适宜的相互作用, 从而拥有较佳的WGS性能. 在本文考察范围内, 300 ℃焙烧4 h制得的样品在各个反应温度点上均表现了最高的WGS活性.

参考文献

[1] Myess D J;Krebs J F;Carter J D;Kumar R, Krumpelt M.Metal/Ceria Water-Gas Shift Catalysts for Automotive Polymer Electrolyte Fuel Cell Systems[A].New Orleans,LA,USA,2002
[2] Kalhammer F R;Prokopius P R;Roan V P;Voecks G E.Status and Prospects of Fuel Cells as Automobile Engines,A Report of the Fuel Cell Technical Advisory Panel[M].Los Angeles,California,USA,1998
[3] Myers D;Krebs J;Yu S;Krumpelt M.Water-Gas Shift Catalysts[A].Argonne National Laboratory,2002
[4] Trimm D L;Onsan Z I .Onboard fuel conversion for hydrogen-fuel-cell-driven vehicles[J].Catalysis Review:Science and Engineering,2001,43(1-2):31.
[5] Gary Jacobs;Leann Williams;Uschi Graham;Gerald A.Thomas;Dennis E.Sparks;Burton H.Davis .Low temperature water-gas shift:in situ DRIFTS-reaction study of ceria surface area on te evolution of formates on Pt/CeO_2 fuel processing catalysts for fuel cell applications[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2003(1):107-118.
[6] Fu Q;Deng WL;Saltsburg H;Flytzani-Stephanopoulos M .Activity and stability of low-content gold-cerium oxide catalysts for the water-gas shift reaction[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2005(1/2):57-68.
[7] Horvath D.;Guczi L.;Toth L. .Gold nanoparticles: effect of treatment on structure and catalytic activity of Au/Fe2O3 catalyst prepared by co-precipitation[J].Catalysis Letters,2000(2/4):117-128.
[8] 郑云弟,林性贻,郑起,詹瑛瑛,李达林,魏可镁.ZrO2对Cu/CeO2-ZrO2水煤气变换催化剂结构、性能的影响[J].中国稀土学报,2005(06):679-683.
[9] 左晓菲,沈明,马桂林.纳米CeO2的形貌控制与表征[J].中国稀土学报,2006(02):247-250.
[10] Haruta M;Tsubota S .Low-temperature oxidation of CO over gold supported on TiO2,α-Fe2O3,and Co3O4[J].Journal of Catalysis,1993,144(01):175.
[11] Grunwaldt J D;Kiener C;W(o)gerbauer C;Baiker Alfons .Preparation of supported gold catalysts for low-temperature CO oxidation via "size-controlled" gold colloids[J].Journal of Catalysis,1999,181:223.
[12] 王桂英,余加佑,廉红蕾,李雪梅,贾明君,张文祥,吴通好,葛炎东.常温常湿CO氧化催化剂Au/Fe2O3的制备与稳定性研究[J].高等学校化学学报,2000(05):752-755.
[13] Li Yue .Low-temperature water-gas shift reaction over Cu- and Ni-loaded cerium oxide catalysts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2000(3):179-191.
[14] Deng W;Jesus J D;Flytzani-Stephanopoulos M .Low-content gold-ceria catalysts for the water-gas shift and preferential CO oxidation reactions appl[J].Applied Catalysis A:General,2005,291:126.
[15] Shannon R D .Revised effective ionic radii and systematic studies of interatomic distances in halides and chaleogenides[J].Acta Crystallographica,1976,A32:751.
[16] Liu W.;Flytzanistephanopoulos M. .TOTAL OXIDATION OF CARBON MONOXIDE AND METHANE OVER TRANSITION METAL-FLUORITE OXIDE COMPOSITE CATALYSTS .1. CATALYST COMPOSITION AND ACTIVITY[J].Journal of Catalysis,1995(2):304-316.
[17] Kundakovic Lj;Flytzani-Stephanopoulos M .Reduction characteristics of copper oxide in cerium and zirconium oxide systems[J].Applied Catalysis A:General,1998,171:13.
[18] Kundakovic L.;Flytzani-Stephanopoulos M. .Cu- and Ag-modified cerium oxide catalysts for methane oxidation[J].Journal of Catalysis,1998(1):203-221.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%