Download Advances in Catalysis, Vol. 32 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.) PDF

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

When you consider that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various components of catalysis learn. This quantity contains articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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004 ? 4 ? 8 g xx ? 04 ? 6 ? 9 ? 0 104 105a 1056 106 107 108 109 21 ? 2 ? 5 13 Ref. 108 108 110 56 111 112 47 113 114 51 cyco Y o 115 116 " Note g and A tensors do not have the same principal axes-consult original article (108)and y5M003/Si0,(108,109) (Fig. 10). 017 and a resolved set of six hyperfine lines about qyy,whereas a sample that is not enriched shows no superhyperfine structure. This is consistent with adsorption at a Mo6+ site. 2 G. This corresponds to adsorption at an A13+ site. On "Mo03/Mg0, there is no indication of Mo6+ sites available either at 77 K or at 300 K.

12. Analysis of the spectrum of 0;stabilized on Sn2+ showing hyperfine lines due to 16% naturally abundant 115-117*119Sn(I = wn. 42 M. CHE AND A. J . TENCH to superhyperfine lines due to interaction of the unpaired electron with l15Sn, "'Sn, and '19Sn, all with I = 3 (all have about the same magnetic moment and a total natural abundance of 16%)(Fig. 12). 0028 and A , = 47, A , = 58, A 3 = 47 G, the former disappearing at lower temperatures (200°C) than the latter (300°C). 13. The EPR spectra at 77 K of 0 ; ion on SnO, pretreated at 400 C (a) in (b) in hydrogen (188).

In support of this, approximate measurements of the intensity of the signals indicate that three Pd(1) ions are lost to form one oxygen species, as would be expected for O i - . At the present time, the argument is open and more evidence is needed to support the existence of 0;- on surfaces. Even in the solid state there are few examples of O i - . 0317. Several possible models for these centers are proposed, one of which involves an 0;- molecular ion near a stabilizing impurity ion (154). ' 36 M.

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