Described is the surface coordination chemistry of cyclohexane, 1,3 and 1,4-cyclohexadiene and cyclohexene on the low Miller index planesand a stepped surface of nickel and on the platinum (111) (111) at 20-70°C. A similar behavior was observed for Pt(lll) at -35 to +135°C although a small degree of dehydrogenation was evident on this surface.
The coordination chemistry of benzene and toluene on Pt(lll) and pt 6(lll)x(lll) has been defined by thermal desorption spectrometry, isotopic labeling studies, and chemical displacement reactions. Benzene chemisorption was largely molecular (non-dissociatve) on Pt(lll) but less so on the stepped surface. At temperatures above 100°C, reversible benzene desorption and benzene decomposition were competing reactions. More than one differentiable benzene chemisorption state was present on both surfaces. Exchange experiments established that.the rate of surface migration of chemisorbed benzene between states on these surfaces was very low. One sharp distinction in the benzene chemistry of the two platinum surfaces was that reversible C-H bond breaking occurred on the stepped surface but not an Pt(lll). Whereas toluene chemisorption on nickel surfaces is fully irreversible, toluene chemisorbed on Pt (111) was partially de sorbed as the toluene molecule at 70-ll0°C. Studies with c 6 H 5 cn 3 and c 6 n 5 cH 3 suggested that the faster low temperature C-H bond breaking process is centered on the methyl group C-H bonds. Chemisorption of mesitylene and m-xylene on Pt-(lli) was partially reversible.
5067The integrals required here involve p = 0 and p = 2, for which integrating the t2 integral by parts gives with h(tl) = cJr"exp(-hzr) ,F1 ( y ; 1 ; -r 2 / 4 r ) X ( A 4 Substituting r' = r + tl in the second integral in eq A-8 and then integrating eq A-7 by parts gives where (A-10) ,F1 ( $;l;-rz/47) = exp (-r2/47) where Ki is the ith order McDonald function, and the last equality follows from the recursion relations hi^^^ among KO, K1, and K,. Thus, substituting eq A-11 into eq A-9givesThe three integrals 1', I,, and I3 suffice to obtain the expression for the radial distribution function in eq 100.
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