By C.H. Bamford and C.F.H. Tipper (Eds.)
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In past times fifteen years there was a dramatic elevate within the variety of varied surfaces whose constructions were decided experimentally. for instance, while in 1979 there have been purely 25 recorded adsorption buildings, up to now there are greater than 250. This quantity is for that reason a well timed evaluation of the state of the art during this dynamic box.
This publication is pretty well to the purpose, with out placing every little thing into riddles and beating round the bush to confuse you.
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There are several possibilities. (a) Dissociative adsorption of molecular hydrogen, which may occur either competitively o r non-competitively with the olefin. H2(gas)+ 2 [ * ] + H + H I I (7) * * (b) Interaction of molecular hydrogen with chemisorbed olefin. RCH=CHR’ + H2 = RCH2-€HR’ + H I * References pp. 1 1 4-1 21 I * I * 26 But-l-ene (g) 11 H,C=CH. CH:! IC\ H3C * CH, H It 11 cis-but-2-ene (g) trans-but-2-ene (g) Fig. 10. Mechanism for the isomerisation of t he n-butenes involving n-allylic intermediates.
Attempts t o interpret the mechanism of ethylene hydrogenation over nickel [96-991 and over platinum catalysts [100,101] in terms of a statistical mechanical approach have not met with any substantial success, partly due t o the limitations of the model which must be assumed in order to perform the calculations and partly due t o the complexity of the calculations themselves. Results obtained from the reaction of ethylene with deuterium have been used t o obtain information regarding the probabilities of the various changes which the adsorbed hydrocarbon species may undergo.
1 1 4-1 21 'oo 80 - - *c v 0 - 60 - 40 I f 1 I Fig. 13. Variation of the percentage chance of adsorbed ethyl reverting to adsorbed ethylene ( r * ) with temperature for various alumina-supported metals [ 1051. probability of alkyl reversal and of olefin desorption. A more quantitative interpretation would require a knowledge of the actual surface eoverages of H and D atoms during the reaction. The parameters q and s give some indication of the origins and fates of the H and D atoms. There appears to be an inverse relationship between TABLE 8 Distribution of products from the reaction of propene with deuterium Conversion a Propenes Catalyst Temp.