Arrhenius plots ethane hydrogenolysis

Figure A3.10.20 Arrhenius plot of ethane hydrogenolysis aetivity for Ni(lOO) and Ni(l 11) at 100 Torr and H2/C2Hg = 100. Also ineluded is the hydrogenolysis aetivity on supported Ni eatalysts at 175 Torr and H2/C2H6 = 6.6 [43].

Fig. 7. Arrhenius plot of the rate constant for hydrogenolysis on nickel/MgAl2O4 and silver/nickel/ MgAl2O4. The rate constant (L) for ethane hydrogenolysis is one order of magnitude lower on the silver/ nickel catalyst than on the nickel catalyst, and the activation energies (determined by the slopes of the Arrhenius plots) are similar for the two.

Figure 5. Arrhenius plots of the rates of ethane hydrogenolysis versus Ni coverage on W(110) at a total pressure of 100 Torr, H2/C2H6 = 100. (Reproduced from ref. 41. Copyright 1987 American Chemical Society.)...

Hgure 4.21 Arrhenius plots for ethane hydrogenolysis over a series of alumina-supported platinum-iridium catalysts containing 0.3 wt% iridium and variable amounts of platinum corresponding to Pt lr atomic ratios ranging from 0 to 9. 

Figure 13.4. Compensation plot of Arrhenius parameters for hydrogenolysis of alkanes (C3 to Ce) on Pt/Si02 (EUROPT-1) circles, total rates open triangles, hydrogenolysis only filled triangles, isomerisation only broken line shows location of points for ethane. ...

Figure 14.1. Compensation plot of Arrhenius parameters for the reactions of (i) neopentane and (ii) n-heptane with hydrogen on various supported metals. They are compared with selected values for ethane hydrogenolysis, the lines being those used to classify the activities of metals for that reaction in Chapter 13 (see Figures 13.3-13.8). Ethane hydrogenolysis Q n-heptane hydrogenolysis v neopentane hydrogenolysis 3 neopentane isomerisation [1.

It is convenient to start by considering the results obtained many years ago by John Sinfelt and his associates for the hydrogenolysis of ethane they are models of clarity, and they provide a suitable framework for results on other systems. In terms of activity, metals divide themselves easily into three classes (i) the very active (ruthenium and osmium) (ii) the moderately active (the majority) and (iii) the least active (palladium and platinum). This distinction is clearly drawn when the Arrhenius parameters are depicted as a compensation plot... 

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