The site densities of solid catalysts

Maatman, Russell W.

doi:10.1016/0021-9517(70)90297-6

Cited by 26 publications

(4 citation statements)

References 40 publications

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“…( 3 ) and (4) for the two different mechanisms (see Table 1). The occurrence of the two processes also allows to derive y M 3.5cm and consequently the number of adsorption sites N m 4 -1011/cm2, in rather good accordance with the literature [26]. Instead, in the absence of the cubic diffusion process in case of CeO, (cfr.…”

Section: Resultssupporting

confidence: 86%

Ionic Oxygen Diffusion in the Cerium and Cerium‐Thorium Oxide Systems

Giordano¹,

Bart

Maggiore³

1982

Zeitschrift anorg allge chemie

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Reduction of the cerium and cerium‐thorium oxide systems with H2 between 450 and 530°C leads to an activation energy of ionic oxygen diffusion ED of 27.2 kcal/mole for CeO2 and of 17.3 kcal/mole for CeO2 containing 1 wt % ThO2. In (CeO2 + ThO2) the reduction process is most complex and may be described by means of a parabolic rate law at the initial stages of the ion diffusion process and by a cubic expression at higher reduction levels; in CeO2 only a second order rate law is observed. The effect of the dopant, i. e. higher reduction rate and reduction level, is ascribed to the lower activation energy of O2− diffusion.

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Section: Resultssupporting

confidence: 86%

Ionic Oxygen Diffusion in the Cerium and Cerium‐Thorium Oxide Systems

Giordano¹,

Bart

Maggiore³

1982

Zeitschrift anorg allge chemie

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“…The site density of this catalyst, 1010-1012 cm'2, is often encountered for solid catalysts (Maatman, 1970) and lies well within the broad range of physically acceptable values for an immobile transition state (105-1017 cm'2) given by Maatman (1976).…”

Section: Thermodynamic Aspectssupporting

confidence: 71%

Kinetics of the metathesis of propene over dirhenium heptaoxide/.gamma.-aluminum oxide

Kapteijn¹,

Bredt²,

Homburg³

et al. 1981

Ind. Eng. Chem. Prod. Res. Dev.

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“…Some very low site densities have been estimated for metallic catalysts. 29 (i) The emergence in alloy studies of the single site concept is explained if the active centres for any alloy composition are M-C,H,.…”

Section: Catalytic Hydrogenation Of Olefins On Metals : a New Interpr...mentioning

confidence: 99%