Hydrogen spillover in bifunctional catalysis
(1996) Journal of Molecular Catalysis A: Chemical — Vol. 112, n° 3, p. 401-412 (1996)
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- Abstract
- A model is proposed to describe the mechanism of hydroconversions on bifunctional catalysts. This mechanism allows a better interpretation of experimental results. It incorporates the concept of hydrogen spillover, i.e. the surface diffusion of activated hydrogen species. The main consequence of the model is that all reaction steps can occur on one reaction site whereas the classical model requires three reaction steps on different reaction sites, Additionally, the catalytic properties of layered bifunctional catalysts (consisting of a macroscopical metal-containing and acidic part) depending on the geometry of such systems can be easily explained. The new model is based on the assumption that a dynamic equilibrium of two coexisting activated (spilt-over) hydrogen species is formed on the surface; one of them bring neutral (H atom) and the other electrically charged (H+ ion). The influence of the spilt-over hydrogen is illustrated and discussed in the case of the conversion of cyclohexane on different metal-containing and acidic catalysts.
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Citations
Roessner, F., & Roland, U. (1996). Hydrogen spillover in bifunctional catalysis. Journal of Molecular Catalysis A: Chemical, 112(3), 401-412. https://doi.org/10.1016/1381-1169(96)00180-X (Original work published 1996)