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• W1996003905 abstract "In discussing the kinetics of a catalytic reaction it is usual to consider three important steps: adsorption of the reactants, reaction, and desorption of the products. The reactions usually take place at sufficiently high temperatures, that physical sorption cannot be observed and thus the effect of the surface structure on the reaction is difficult to follow. Noncatalytic surface reactions involve the first two steps, and the formation of a stable surface product. The kinetics of some of these reactions can be determined spectroscopically by following changes in the surface structure. Reactions of mono-, di-, tri-, and tetrachloromethylsilanes, germanium tetrachloride, boron trichloride, and hexamethyldisilazane with the hydroxyl are therefore reviewed. The kinetics are interpreted by an equation of the form: r = Aexp(−ERT)[OH] m[θ]n, where m is given by the stoichiometry of the reaction and n is given by the stoichiometry of the adsorption process. An initial fast reaction with chlorine-containing reagents is attributed to interaction with the reactive sites described by Morrow and Cody. Direct chlorination of the surface siloxane bridges causes an increase in activation energy of the reaction but no change in kinetic order. Introduction of an unsaturated atom (e.g., BCl3 reaction) causes autocatalysis. On hydrolysis of the reaction product, the boron “impurity” causes increased reactivity of the reformed silanol group (and a change in reaction mechanism) even though it appears at the same frequency as on the clean surface. The significance of these results in terms of catalytic reactivity is discussed." @default.
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• W1996003905 creator A5058654152 @default.
• W1996003905 date "1977-06-01" @default.
• W1996003905 modified "2023-09-24" @default.
• W1996003905 title "Effect of surface structure on the reaction of silica surface with hydrogen-sequestering agents" @default.
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• W1996003905 doi "https://doi.org/10.1016/0021-9797(77)90266-1" @default.
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