欢迎登录材料期刊网

材料期刊网

高级检索

在不同温度的CO2气氛中对Pd膜进行了毒化,将毒化后的Pd膜与氢气反应并测试其氢同位素渗透性能.采用XPS、SEM等检测了CO2在不同温度下对Pd膜毒化后的表面成分与形貌,并对比分析了吸氢前、后的Pd膜表面状态的变化,得出了CO2对Pd膜表面状态的影响规律,探讨了CO2气体的毒化机理.结果表明,CO2分子在Pd表面会解离成为C=O,C-O与O原子,随着温度升高,C=O减少,而C-O与O原子含量增加.当CO2毒化温度达到500℃时,Pd表面会生成PdO并伴有微孔出现,而C-O随温度升高能够稳定吸附于Pd表面.毒化后的试样在常温下进行吸氢反应后表面PdO消失,吸附O含量减少,多孔形貌得到改变.CO2毒化后,由于C-O与O原子在Pd表面吸附并占据了Pd膜表面的氢解离位,从而导致Pd膜透氘能力下降.

参考文献

[1] 张桂凯,陆光达,陈虎翅,银陈.CO,O2,CH4,CO2对钯柱氢氘排代性能的影响[J].稀有金属材料与工程,2007(06):1106-1109.
[2] Dean H W Carstens;Pete D Encinias .Hydrogen Isotope Exchanges over Palladium Meta,Conf-9009141-11[R].Los Angeles:Los Angeles National Laboratory,USA,1991.
[3] Amandusson H;Ekedahl L G;Dannetun H .[J].Surface Science,2000,153:259.
[4] Wang D;Clewley J D;Flanagan Ted B et al.[J].JAlloy Comp,2004,374:158.
[5] Wang D;Clewley J D;Flanagan Ted B et al.[J].Journal of Alloys and Compounds,2000,261:298.
[6] Westerstr(o)m R;Weststrate C J;Resta A.[J].Surface Science,2008(1 4):2440.
[7] Wang J;Yun Y;Altman EI .The plasma oxidation of Pd(100)[J].Surface Science: A Journal Devoted to the Physics and Chemistry of Interfaces,2007(16):3497-3505.
[8] Titkov AI;Salanov AN;Koscheev SV;Boronin AI .Mechanisms of Pd(110) surface reconstruction and oxidation: XPS, LEED and TDS study[J].Surface Science: A Journal Devoted to the Physics and Chemistry of Interfaces,2006(18):4119-4125.
[9] Amano M;Nishimura C;Komaki M .[J].Journal of Membrane Science,1990,31(05):404.
[10] Gielens FC;Knibbeler RJJ;Duysinx PFJ;Tong HD;Vorstman MAG;Keurentjes JTF .Influence of steam and carbon dioxide on the hydrogen flux through thin Pd/Ag and Pd membranes[J].Journal of Membrane Science,2006(1/2):176-185.
[11] Hou K.;Hughes R. .The effect of external mass transfer, competitive adsorption and coking on hydrogen permeation through thin Pd/Ag membranes[J].Journal of Membrane Science,2002(1/2):119-130.
[12] Booth J C S;Doyle M L;Gee S M.Proceedings of the 11th World Hydrogen Energy Conference[M].Stuttgart:International Society for Hydrogen Energy,1996:867.
[13] 王建伟;邵宇;钟顺和 .[J].催化学报,1998,19(04):305.
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%