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

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

In view that 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the varied parts of catalysis study. This quantity contains articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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The same reaction is completely inhibited in the gas phase by the large dissociation energy of H, or D, (103 kcal/mole). Once the H2 molecule is dissociated, the successive atom-molecule reaction (H + D, HD + D) in the gas phase still has a potential energy barrier of roughly 10 kcal/mole. The H,-D2 exchange reaction was studied by Bernasek and Somorjai (31) using platinum single-crystal surfaces of low and high Miller index. Under conditions of the experiments, which put strict limitations on the residence time of the detected molecules, the reaction product HD could not be detected from the (111) crystal face.

At low pressures (10-7-10-4 Torr) the reaction rate and product distributions are monitored by quadrupole mass spectrometer, while the surface structure and composition are determined by LEED and AES, respectively, during the surface reaction if desired. Then a small cup (total volume approximately 10 cm3) can be placed around the crystal sample to isolate it from the rest of the chamber. The chamber can be pressurized to over 100 atm, if desired, during the mixing of gaseous reactants. The highpressure reaction chamber is connected to a gas chromatograph, which serves to monitor both rate and product distribution in this circumstance.

Scheme of the LEED technique. 9. 5 eV, (c) 160 eV, and (d) 181 eV. diffraction features in LEED (Fig. 9) establishes that the surfaces are ordered on the atomic scale. In addition, the positions and symmetry of the diffraction spots can be used to determine the two-dimensional periodicity of the surface structure. We can imagine for the moment that the surface structure will be rather like the determination of the bulk structure along the crystal plane, although there may be a rearrangement or reconstruction of the surface atoms from the bulk structure.

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