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- W2057520835 abstract "The relationship between exposed catalytic sites (a) and exposed catalyst sites (A) was postulated to be in accord with (J. J. Carberry,J. Catal.107, 248 (1987)) a = D0(Ā)d + 1 where D0 is a site discrimination coefficient and d the exponent of structure sensitivity. Recently assembled data of D. Farin and D. Avnir (J. Amer. Chem.110, 2039 (1988)) which support the postulated activity-yield/selectivity structure-sensitive relationships are cited. In sum a vast corpus of data supports the law (J. J. Carberry, J. Catal.107, 248 (1987)) RateĀ = K(Ā)d = N, turnover number for a given site type at a fixed fluid-phase composition. When two or more site types are involved in a complex (multipathed) reaction network, not only is activity (conversion) affected by structure sensitivity but yield/selectivity (the ratio of turnover numbers) can also be influenced. Comments on the significance of the exponent d which suggest a distinction between demanding/facile and structure sensitive/insensitive behaviors are offered. Simple geometric argument predicts d = 0 to 2 while a value of d ≷ 0 can be rationalized if morphological/chemical changes accompany crystallite size variation. A turnover velocity, N0, independent of fluid-phase composition (conversion x) is suggested, for reactant order n, as N0RateĀCn = N(C0(1 − x))n = kvD0(Ā)d where C0 is feed concentration and kv the intrinsic reaction velocity per active site per exposed site." @default.
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- W2057520835 date "1988-12-01" @default.
- W2057520835 modified "2023-10-17" @default.
- W2057520835 title "Structure sensitivity in heterogeneous catalysis: Activity and yield/selectivity" @default.
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- W2057520835 doi "https://doi.org/10.1016/0021-9517(88)90031-0" @default.
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