Summary
Silica and alumina activated by hydrogen spillover become catalysts for the hydrogenation of ethylene at temperatures as low as 140°C. The hydrogenating sites created on the surface of these oxides are resistant to O2at 430°C and to traces of NH3. The spilled over hydrogen, adsorbed on the surface of these oxides inhibits the hydrogenation of the first dose of ethylene and is responsible for the induction period observed at the beginning of the catalytic reaction. When this hydrogen is consumed by the interaction with the olefin, or when it is removed by evacuation at 200°C prior to the reaction, the hydrogenation of any dose of ethylene is characterized by kinetic behaviour exhibiting a continuously decreasing rate. The activated alumina can reform the spilled over hydrogen from H2(g) at 430°C whereas for silica the spilled over hydrogen can only be furnished by a platinum catalyst during activation. Magnesia activated by spilled over hydrogen becomes catalyst for the hydrogenation of ethylene even from temperatures as low as 50°C. However in contrast to the behaviour of silica and alumina towards ammonia, magnesia is deactivated by this compound while remaining insensitive to oxygen at 430°C. Kinetic data for the hydrogenation of ethylene by activated silica show that the reactants react in the adsorbed phase according to the Langmuir-Hinshelwood mechanism.
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© 1983 D. Reidel Publishing Company
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Teichner, S.J., Pajonk, G.M., Lacroix, M. (1983). Spillover on Non Metals. In: Bonnelle, J.P., Delmon, B., Derouane, E. (eds) Surface Properties and Catalysis by Non-Metals. NATO ASI Series, vol 105. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7160-8_19
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DOI: https://doi.org/10.1007/978-94-009-7160-8_19
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