Spillover (catalysis)

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Spillover is a possible partial step in heterogeneous catalysis . An activated species diffuses from one catalytically active center to another center, which is chemically different from the first center.

background

The spillover phenomenon was discovered independently by several working groups in the 1960s. The effect has been demonstrated by Conner et al. defined as follows:

"Spillover involves the transport of active species which are adsorbed or formed on a first phase onto another phase that does not adsorb or form the species under the same condition."

"Spillover is associated with the transport of an active species that is adsorbed or formed on a first phase to another phase, which the species does not adsorb or form under the same conditions."

- Conner et al. (1984)

Are known hydrogen - or oxygen atoms as spillover components. The use of the spillover effect is a promising factor for increasing the catalytic activity in industrial processes.

literature

  • Can Li, Qin Xin (Ed.): Spillover and Migration of Surface Species on Catalysts: Proceedings of the 4th International Conference on Spillover . Dalian, China, Jan. 15-18 September 1997 (=  Studies in Surface Science and Catalysis . Volume 112 ). Elsevier, 1997, ISBN 978-0-444-82333-5 .
  • Valerii V. Rozanov, Oleg V. Krylov: Hydrogen spillover in heterogeneous catalysis . In: Russ. Chem. Rev. Vol. 66, No. 2 , 1997, p. 107 , doi : 10.1070 / RC1997v066n02ABEH000308 .
  • F. Roessner: Spillover Effects . In: Gerhard Ertl , Helmut Knözinger , Ferdi Schüth , Jens Weitkamp (eds.): Handbook of Heterogeneous Catalysis . 2nd Edition. Vol. 3. Wiley-VCH, 2008, p. 1574-1585 .

Individual evidence

  1. ↑ WC Conner, Jr. et al., General Discussion at the 1st International Conference on Spillover , in: GM Pajonk, SJ Teichner, JE Germain (Editors), Spillover of Adsorbated Species - Comments, Queries and Replies at the International Symposium lyon- Villeurbanne , September 12-16, 1983, Disc. Spill Ads. Spec. 1983 Lyon-Villeurbanne, Université Claude Bernard, Villeurbanne, France, 1984, p. 71
  2. ↑ F. Rößner, U. Mroczek, A. Hagen, Hydrogen Spillover in the conversion of cyclohexane on ZSM-5 zeolites, in: T. inui, K. Fujimoto, T. Uchijima, M. Masai (Editors), Studies in Surface Science an Catalysis 77: New Aspects of Spillover Effect in Catalysis, Elsevier Science BV, Amsterdam-London-New York-Tokyo, 1993, pp. 151-158