Download Advances in Catalysis, Vol. 37 by D. D. Eley, Herman Pines, Paul B. Weisz PDF

By D. D. Eley, Herman Pines, Paul B. Weisz

Given that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various components of catalysis examine. This quantity comprises articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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Extra info for Advances in Catalysis, Vol. 37

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Guo et al. (38) and Huang et al. (42) have studied SSIMS for the systems NiOly-AI20,, Mo03/y-A120,,P,05/y-A1203,and CuCl/y-A1203by using a fixed Ar’ ion beam to bombard a spot on the surface of samples. When the concentrations of NiO, Moo3, P,O,, and CuCl are lower than their respective monolayer dispersion capacities, their signals decline exponentially with time. Figure 18 shows the SSIMS results for CuCl that is monolayer dispersed on the surface of y-A1203. MONOLAYER DISPERSION OF OXIDES A N D SALTS I 2 thin) 23 3 FIG.

32) come to the conclusion that vinylidene may be the precursor to ethylene formation. On the other hand, ethylidyne was suggested to be involved in the direct hydrogenation of acetylene to ethane (33, 34). Recently Hub and Touroude (35)showed that during hydrogenation of I-butyne, the Pd surface is covered by strongly but reversibly adsorbed 1 -butyne molecules (adcarbenes or adcarbynes), which may lead to direct hydrogenation. These species are in equilibrium with vinylic adsorbed species, which play a role of a reactive intermediate to butenes.

This was achieved by drastic sintering of a Pt film for 3 h at 527”C, in D, (4 torr). Appreciable amounts of monodeuteriated isopentane formed in the reaction products strongly support a mechanism involving an adsorbed alkyl species as the intermediate in the isomerization of neopentane, for example, the McKervey-Rooney-Samman mechanism (Fig. 2c) (46, 69). On the other hand, drastically sintered Pd(ll1) films still gave overly rapid D,/neopentane exchange to isomerization (51, 52). However, when the exchange reaction is carried out at temperatures only slightly lower than those at which the isomerization begins, the mode of exchange may give some indirect indications as to the population of adsorbed species at high temperatures.

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