By W. Nicholas Delgass
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Additional info for Spectroscopy in Heterogeneous Catalysis
Example text
When ZnO was exposed to an equilmolar mixture of C 0 2 and H 2 (or C 0 2 and D 2 ), the spectrum that resulted was identical to that observed for 52 2. Infrared Spectroscopy adsorbed HCOOH (or DCOOD). Bands at 2870, 1572, and 1369 cm"x are assigned to the C-H stretching, O-C-O asymmetric stretching and O-C-O symmetric stretching vibrations, respectively, of the surface formate ion. The C-H inplane bending vibration is also observed at 1379 cm" 1 and both C-H bands shift as expected when DCOOD or the C0 2 /D 2 mixture is adsorbed.
Of the systems so far studied it would appear that equivalent or superior spectra could be obtained by simpler methods, but this may not be the case for opaque materials or bands expected to occur in the far infrared. Many catalysts of interest operate at temperatures above 200°C. To record their infrared spectrum under reaction conditions necessarily means that one Fig. 2-6 Optical projection of a diffusely reflecting sample onto the detector by means of a rotation ellipsoid. S is the source focused on the sample P by mirror M and lens L.
Moreover, the band at about 395 c m - 1 (breathing mode of pore openings) was found to be the most sentivie to changes in crystallinity. As much as 50% removal of A1 2 0 3 from the zeolite structure using ethylenediamminetetraacetic acid does not change the integrated intensity in this case. This is 44 2. Infrared Spectroscopy interpreted to be the result of replacement of extracted Al by Si. At still higher Al removal, Si is also extracted and the intensity of 395 cm" 1 band (crystallinity) decreases.