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Volumn 107, Issue 35, 2003, Pages 9325-9331

On the compensation effect in heterogeneous catalysis

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION ENERGY; AMMONIA; DISSOCIATION; NITROGEN; PALLADIUM; PROBABILITY DENSITY FUNCTION; REACTION KINETICS; RUTHENIUM; SYNTHESIS (CHEMICAL);

EID: 0141459866     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp034447g     Document Type: Article
Times cited : (157)

References (40)
  • 13
    • 37049044097 scopus 로고
    • Exner, O. Nature 1964, 201, 488-490.
    • (1964) Nature , vol.201 , pp. 488-490
    • Exner, O.1
  • 19
    • 0141798001 scopus 로고    scopus 로고
    • note
    • From pp 454-455 in ref 18: "The compensation effect has been rationalized in a variety of ways. It is though that one catalyst may have a large concentration of active sites where the reaction requires a high activation energy, while the other catalyst, which is prepared differently, has a small concentration of active sites that have low activation energies for the same surface reaction. An atomic-level explanation of the compensation effect remains the task of scientists in the future."
  • 24
  • 31
    • 0141463113 scopus 로고    scopus 로고
    • note
    • All the models discussed in the present paper assume that dissociation of a reactant molecule is rate-limiting. If we instead impose stationary coverages, the assumption of a rate-limiting step is no longer necessary. We have implemented the stationary coverage microkinetic model for reactions, 1a, 1b, and 2. This model shows that under relevant reaction conditions the assumption of the rate-limiting step is well-justified and the qualitative behavior for the models discussed in the present paper stays unchanged in the relevant catalytic regime.
  • 32
    • 0141797998 scopus 로고    scopus 로고
    • note
    • Whereas the presented limit is correct for the model we discuss here, this limiting behavior is only correct when the dissociation of the reactant is the rate-limiting step. This is true close to the top of the volcano curve and to the right of it. A model that also takes the switching of the rate-limiting step into account shows a different limiting behavior for very low coverages of free stes. This happens further to the left of the top of the volcano, but this regime is, however, probably not experimentally accessible, as the metal surfaces there will have have a strong tendency to form nitrides, oxides, carbides, etc., depending on which reactants are used.
  • 34
    • 0141574773 scopus 로고    scopus 로고
    • http://www.fysik.dtu.dk/CAMPOS.
  • 39
    • 0003516749 scopus 로고
    • Oxford University Press: Oxford, U.K.
    • Atkins, P. W. Physical Chemistry; Oxford University Press: Oxford, U.K., 1994.
    • (1994) Physical Chemistry
    • Atkins, P.W.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.