By D. D. Eley, Herman Pines, Paul B. Weisz
In view that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various parts of catalysis study. This quantity contains articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra resources for Advances in Catalysis, Vol. 37
DIFFERENTIAL THERMAL ANALYSIS The monolayer-dispersed oxide or salt exhibits no peak at its melting point in the differential thermal analysis (DTA) pattern of the sample. Figure 28a shows a DTA pattern of a CuCl,/y-Al,O, sample without a peak at the melting point of CuCI, (498"C), because the CuCl, content of the sample is still below the monolayer dispersion capacity. However, b and c do exhibit peaks at 498°C because of the residual crystalline CuCl,, which is present either due to low specificity of the surface of the support or to the high content of CuCl,.
A) The TG curve recording the loss of weight in temperature-programmed reduction. (b) The DTG curve. It has also been observed by Zhang et al. that NiO in the monolayerdispersed state is much more difficult to reduce than is NiO in the crystalline state. 70 g NiO/g y-Al,O,. In this sample, about one-third of NiO is monolayer dispersed and the other portion is in the crystalline state. They behave differently during the process of reduction. The weight loss in the range 300-390°C on the TG and the distinct peak at 337°C on the DTG curve are due to the reduction of NiO in the crystalline state.
111. Effects of Monolayer Dispersion Oxides or salts in a monolayer state and in their crystalline state behave differently in many respects. Effects of monolayer dispersion show up in spectra as well as in the properties of the oxides and salts. A N D AUGER ELECTRON SPECTROSCOPY A. X-RAYPHOTOELECTRON Because X-ray photoelectron spectroscopy (XPS) is a surface-sensitive technique, oxide or salt dispersed on the surface of a support as monolayer will give an XPS signal much stronger than that given by the respective mixture of oxide or salt and the support.