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Download Advances in Catalysis, Vol. 26 by D. D. Eley (ed.), Herman Pines (ed.), Paul B. Weisz (ed.) PDF

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

Seeing that 1948, this serial has sought to fill the space among the papers and the textbooks that train the varied parts of catalysis examine. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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The computation is repeated using various locations for surface atoms until the best agreement between experiment and theory is obtained. Figure 1 1 shows the computed and experimental intensities of diffraction beams from a Pt( 11 1) clean surface where best agreement between experiment and theory has been obtained. For this surface the atoms appears to be positioned according to the predictable projection of the X-ray unit cell to that particular surface. FIG. 1 1 , Comparisons of theory and experiment for I - - V profiles from Pt(l11) at room temperature for (a) the (00)beam and (b) the (TO) beam at three angles of incidence.

Energy level diagram representation of the excitations by (a) Auger electron emission and (b) X-ray fluorescence. ACTIVE SITES IN HETEROGENEOUS CATALYSIS 23 of the electron levels, which is then ejected. Energy analysis of the emitted electrons will give differences in binding energy between electronic bands participating in the Auger process, which are characteristic of a given element. Analysis of the X-ray fluorescence spectra gives similar information. It has been found, however, that for light elements (with the exception of hydrogen and helium which cannot be detected since these elements have no inner electronic shells) the probability of Auger transitions is much greater than that of X-ray fluorescence.

S. welded bellows n Sampling volve n ) Gas \ chromatograph II To mechanicol pump To gas monifold Gas intr0duction-J needle Welded metal be1lows pump FIG. 16. Schematic of the experimental apparatus to carry out catalytic reaction rate studies on single-crystal surfaces at low and high pressures in the range 10-’-lO4 Torr. 26 G . A. SOMOFUAI cup in the reaction chamber. The effect of adding an impurity or a second constituent (alloying) to the surface on the reactivity can also be studied in this system.

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