By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
(from preface)There were many demanding situations in our decade to associations, customs, principles, to almost every thing that has grown and collected over such a lot of human generations. This comprises the practices of the medical neighborhood, of educating, and of analysis. within the arguments in regards to the reasons and advantages of medical endeavors, these in catalysis haven't been ignored. certainly, they isn't, for catalysis is unavoidably a phenomenon of the maximum value to society. it might probably offer, actually, a terrific area for all types of routines pertaining to ''relevance.''
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Extra info for Advances in Catalysis, Vol. 24
RybAEek and Setinek (94) investigated the kinetics of these reactions in the gaseous phase at 316°C using thorium oxide on activated carbon (p. 27) as the catalyst. This model system allowed the study of each reaction separately as well as of the simultaneous conversion of both acids. 2 CH&OOH + CHsCOCH3 + CO, + HzO (VIIa) 2 CzHaCOOH + CzHsCOCzHa + COz + Hz0 (VIIb) In the latter case, along with the reactions (VIIa) and (VIIb) the cross reaction (VIIc) of both acids also takes place yielding the unsymmetrical 36 L.
For an isolated reaction the best one was Tio = ki(KACpic)'/(1 + KAcpi~)~, (24) and for parallel reactions they were + KA h(KAc,picJ2/(1+ KA rl0 = kl(KAcipic1)2/(1 r2O = c$Acl + KAenPicr)'~ (254 KAczPid3, (25b) CIPACI O $. k ~ ~ ~ ~ , K ~ ~ ~-k pK i A, g~ i~-k~PK ~~ /,A(~ ~~ ~ P ~(254 ~ . The values of the rate constants and adsorption coefficients obtained by the study of isolated reactions agreed well with those obtained by the study of parallel reactions (Table V). The three values of the adsorption coefficient of each acid were obtained independently.
1 stances A and B. In any case the selectivity factor S differs, of course, from the factor for noncatalytic competitive reactions (S = kl/k2) in that it includes also the adsorption coefficients of competing substances. e. selectivities) should be characterized by the ratio of their rates measured separately [relations (12) and (13)], or whether they should be expressed by the rates measured during simultaneous transformation of two compounds which thus compete in adsorption for the free surface of the catalyst [relations (14) and (15)].