By D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.)
Seeing that 1948, this serial has sought to fill the space among the papers and the textbooks that train the various components of catalysis examine. This quantity comprises articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra resources for Advances in Catalysis, Vol. 26
Even though for other transition metals the chemistry of low coordination number surface sites is likely to be different from the terrace atom sites that are predominant on low Miller index surfaces, the hydrocarbon molecules may not remain intact on either high or low Miller index crystal faces. Platinum and perhaps palladium and nickel are the elements to show this drastic variation of reactivity when one compares low and high Miller index crystal faces at low temperatures and reactant pressures.
Welded bellows n Sampling volve n ) Gas \ chromatograph II To mechanicol pump To gas monifold Gas intr0duction-J needle Welded metal be1lows pump FIG. 16. Schematic of the experimental apparatus to carry out catalytic reaction rate studies on single-crystal surfaces at low and high pressures in the range 10-’-lO4 Torr. 26 G . A. SOMOFUAI cup in the reaction chamber. The effect of adding an impurity or a second constituent (alloying) to the surface on the reactivity can also be studied in this system.
Low coordination number sites, are responsible for decomposition via dehydrogenation and C-C bond breaking of hydrocarbon molecules, which can take place at these sites with near zero activation energy. In the absence of a large concentration of the low coordination number sites, the hydrocarbon molecules remain intact below 450 K and Torr) and their surface crystallography may be at low pressures (readily studied. However, in the presence of atomic steps and kinks only carbonaceous residues remain on the surface, which are the products of decomposition of the various hydrocarbon molecules that participate in chemisorption or in surface chemical reactions.