Beeck

Catalysis and the Adsorption of Hydrogen on Metal Catalysts Otto Beeck... 

Beeck at Shell Laboratories in Emeryville, USA, had in 1940 studied chemisorption and catalysis at polycrystalline and gas-induced (110) oriented porous nickel films with ethene hydrogenation found to be 10 times more active than at polycrystalline surfaces. It was one of the first experiments to establish the existence of structural specificity of metal surfaces in catalysis. Eley suggested that good agreement with experiment could be obtained for heats of chemisorption on metals by assuming that the bonds are covalent and that Pauling s equation is applicable to the process 2M + H2 -> 2M-H. 

Evaporated film catalysts are virtually always used with a static gas phase, and with reactant gas pressures less than about 100 Torr. One thus relies upon gaseous diffusion and convection for transport to the catalyst surface. However, provided one is dealing with reaction times of the order of minutes to tens of minutes, gas phase transport has but a negligible effect on the reaction, provided none of the reaction volume is separated from the film by small bore tubulation. Beeck et al. (77) in fact originally used an all-glass magnetically coupled turbine for gas circulation, but this is only... 

Haworth, D. C. (2001). Application of turbulent combustion modeling. In J. P. A. J. van Beeck, L. Vervisch, and D. Veynante (eds.), Turbulence and Combustion, Lecture Series 2001-03. Rhode-Saint-Genese, Belgium Von Karman Institute for Fluid Dynamics. 

Hadler 26) employed conformational analysis to explain the difference in the proportion of cholestane to coprostane derivatives resulting from the reduction of A and d steroids. He suggested that the hydrogenation process involved the formation of a quasi-ring structure between the unsaturated carbon atoms and two hydrogens originally dissolved in the metal, a mechanism which is similar to one proposed by Beeck (27) and by Jenkins and Rideal 28). He assumed, in effect, that the saturated struc-... 

Van Dyck, D. Op de Beeck, M. Proc. 11th Intern. Congr. on Electron Microscopy, Seattle, (1990) 26-27. 

D Van Dyck, M Op de Beeck. A simple intuitive theory for electron diffraction. Ultramicroscopy 64 99 - 107,1996. 

W Coene, G Janssen, M Op de Beeck, D Van Dyck. Phase retrieval through focus variation for ultra-resolution in field-emission transmission electron microscopy. Phys. Rev. Letts. 69 3743-3746, 1992. 

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