Effect of MoO3 Morphological Change over Hydrogen Spillover Kinetics

MoO3 Morphology 변화가 수소 Spillover에 미치는 영향

  • Kim, Jin Gul (Department of Chemical Engineering, Soonchunhyang University)
  • 김진걸 (순천향대학교 공과대학 화학공학부)
  • Received : 1999.02.01
  • Accepted : 1999.11.22
  • Published : 1999.12.10

Abstract

sothemal reduction at $50^{\circ}C$ using $Pt/MoO_3$ or $Pt/MoO_3/SiO_2$ made by dry impregnation or physical mixture of $Pt^{\circ}$ and $MoO_3$ demonstrated that the $H_2$ uptake vis $H_2$ spillover from Pt into $MoO_3$ was enhanced as calcination temperature was increased. Surface area of exposed Pt crystallites measured by CO chemisorption was decreased with higher calcination temperature. In addition, TEM showed that $MoO_x$ overlayers were formed on Pt crystallites after calcination at $400^{\circ}C$. Consequentially, it was found that this increased active contact sites between Pt and $MoO_3$ due to surface morphological change was one of the dominant factors for this increased $H_2$uptake via $H_2$ spillover from Pt crystallites into $MoO_3$.

Keywords

hydrogen spillover;overlayer;calcination;$Pt/MoO_3$;$Pt/MoO_3$/$SiO_2$

References

  1. J. Chem. Soc. Faraday Trans. Ⅰ. v.72 P. A. Sermon;G. C. Bond
  2. J. Chem. Soc. Faraday Trans. Ⅰ. v.72 P. A. Sermon;G. C. Bond
  3. J. Less-Common Metal v.36 G. C. Bond;J. B. P. Tripathi
  4. Z. Phys. Chem. Ne. Folg. Bd. v.64 M. Boudart;M. A. Vannice;J. E. Benson
  5. Catal. Lett. v.3 X. Lin;J. Francois;H. Lambert;J. J, Fripiat
  6. ACS Syposium Series v.178 H. S. Gandhi;coworkers
  7. J. Catal. v.139 J. G. Kim;J. R. Regalbuto
  8. Surface Science v.54 J. J. Fripiat;R. Erre;H. Van Damme
  9. J. Catal. v.108 J. R. Regalbuto;C. W. Allen;E. E. Wolf
  10. J. Chin. Phys. Chim. Biol. v.76 D. Tinet;J. J. Fripiat
  11. J. Catal. v.107 J. R. Regalbuto;T. H. Fleisch;E. E. Wolf
  12. J. Chem. Soc. Farad. Trans. Ⅰ. v.72 G. C. Bond;J. B. P. Tripathi
  13. J. Catal. v.87 J. P. Marcq;G. Poncelet;J. J. Fripiat
  14. J. Catal. v.133 A. K. Datta;J. W. Ha;J. R. Regalbuto
  15. J. Catal. v.32 R. B. Levy;M. Boudart