Chemical Engineering

Download Advances in Catalysis, Vol. 31 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.) PDF

By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

Particular clinical benefit and a wealth of knowledge make the e-book tremendous beneficial, like different volumes within the series.(from preface)A major a part of the hassle in catalysis study is predicated on an realizing extra entire wisdom of the character and behaviour of reactive intermediates or chemisorbed complexes will permit us to supply greater catalysts for commercial strategies. The aiding funds stream is definitely in accordance with this assumption. This quantity of Advances in Catalysis provides completely written bills of 4 diversified sectors of this attempt.

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Extra resources for Advances in Catalysis, Vol. 31

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The major effect of adsorbing butadiene was to induce a migration of copper cations to site 111, located at the pore entrances to the supercages (see Fig. 17). The unsaturated coordination of 34 I . E. MAXWELL Si, A t FIG. 17. Perspective view showing the siting of Cu(II1) cations at the pore entrance to the supercage (Cu2+-exchanged faujasite, dehydrated at I SWC, butadiene adsorbed). The occupancy factors are such that there is approximately one Cu(11l) cation per two pore entrances. these cations to the zeolite framework and their ideal location for interaction with adsorbate molecules led to the suggestion that these were most probably the sites where the butadiene cyclodimerization reaction occurs.

12 an optimum activity was obtained for a calcination temperature of 300"C, which corresponded to platinum particles in the range of 20-50 A in diameter. ) in zeolite Y had reduced hydrogen adsorption capacity and hence reduced dehydrogenation activity. Dehydrogenation activity has been demonstrated for Rh, Co, and Ni forms of zeolites X and Y (123-125). Both cyclohexane and tetralin dehydrogenation to benzene and naphthalene, respectively, have been used as test reactions. For N i x zeolites, unreduced Ni2+ ions were considered (124) to be the active centers.

In a comparative study (205), RhNaX catalysts were prepared by both ion exchange and impregnation with RhCI,. The former catalyst was superior with regard to both activity and selectivity, provided that the chloride ions were thoroughly removed following ion exchange. o Rh. 19. Specific activity of RhNaX for methanol carbonylation as a function of rhodium concentration. (Reproduced from Ref. ) 42 I . E. 5 wt. 25. I, Selectivity, S , to CH,COOCH, was calculated using S = [ T ~ ~ ~ +~ rrlher)Ir ~ J ( where ~ ~ rEltrr= rate of formation of ester; = rate of formation of ether (sole by-product).

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