FTIR spectra collection

N02 adsorption experiments were also performed over the reference P(—Ba/y-Al203 (1/20/100 w/w) sample and similar results have been obtained (see Figure 6.3). It is worthwhile noting that in this case, the NO outlet concentration can be related to both the N02 disproportionation and the N02 decomposition reactions. In fact, 02 formation was also observed in this case, in line with N02 decomposition to NO and oxygen over Pt sites. FTIR spectra collected over the Pt-Ba/y-Al203 reference catalyst (Figure 6.3b) pointed out also in this case that nitrate species are formed upon N02 adsorption. 

Figure 3.61 FTIR spectra collected at -1.5V to -1.9 V in lOOmV steps and normalised to the reference spectrum taken at — 1.0 V Tor the system in Figure 3 60 From Christensen m al.

Figure 3.62 FTIR spectra collected from the glassy carbon electrode immersed in CO -saturated acetonitrile/0.2 M tetraethylammonium tetrafluoroborate containing 5xlO 3M Re(dmbpy)(CO).,Cl. The spectra were collected at —1.1V, —1.3 V, — 1,4 V - 1.7 V and — 2.0 V, and normalised to the spectrum taken at — 1.0 V. 1100cm -1750cm"1 region. From...

Figure 3.65 FTIR spectra collected from the glassy carbon electrode immersed in COr saturated acetonitrile-water (9 l)/0.2M tetraethylammonium letrafluoroborate containing 5 x 10 3 M (Dmbpy)Re(CO)3Cl. The spectra were collected at potentials between —1.2 V and —1.6 V in lOOmV steps and are normalised to the spectrum taken at —1.0 V. From Christensen...

Figure 3.13. (d) Time-resolved attenuated total reflectance (ATR) Fourier transform infrared (FTIR) spectra collected during arsenic (As) oxidation on random stacked bimessite (RSB). Peaks represent the oxidation product, arsenate, adsorbed at the RSB surface. (Z ) As oxidation kinetic data collected on RSB (O) on hexagonal bimessite (H-Bi) ( ) during a batch experiment. Inset shows the peak height versus time plot for the spectra seen in the top panel, illustrating the higher time resolution achievable with rapid-scan ATR-FUR spectroscopy. (From Borda and Sparks, unpublished data, 2006.)... 

Figure 13. In situ FTIR spectra collected from the Ru(OOOl) electrode in 0.1 M HCIO4 solution at 20 °C during a potential step experiment after the adsorption of CO. The CO was preadsorbed at -200 mV, after which the solution was sparged with N2, the potential was then stepped up to +1100 mV in 25 mV increments, with further spectra collected at each step. The spectra showing the CO2 absorption were normalized to the first spectrum, collected at-200 mV. The spectra showing the CO absorption were normalized to a spectrum taken after holding the potential at +1100 mV for 2 min at the end of the experiment, to ensure the electrode surface was free of adsorbed CO. Some of the spectra collected are omitted for the sake of clarity. Potentials are referenced against Ag/AgCl,CF electrode. Reprinted from Copyright (2004) with permission from Elsevier.

Figure 6.3 FTIR spectra collected on some of the samples analysed in this work. Plot (a) shows the spectra of virgin samples solidified at two cooling rates the plot (b) spectra shows samples which have undergone a different number of recycling steps, and were solidified at the fastest applied cooling rate. The insets show a magnification of the plots. Reproduced with permission from F. De Santis and R. Pantani, The Scientific World Journal, 2013, Article ID 354093.

Figure 20.8 Subtraction of FTIR spectra collected at different sorption times in the case of water vapor sorption test 70/30 PP/PE/EVOH 61m. Reprinted with permission from Ref [79] 2009, Elsevier.

The FTIR spectrum collected after the adsorption of CO on a saturated NiO(l 11) film prepared at 3(X) K (Figure 3c) is significantly different from both clean and c(2x2)-... 

Figure 3 Typical beam path configuration for collecting an FTIR spectrum using an attenuated total reflectance element Iq is the incident infrared beam, f is the exiting beam.

This system was subsequently investigated by Christensen et at. (1990) also using in situ FTIR, who observed identical product features (see Figure 3.48). In order first to compare directly the IR spectrum of oxalate generated in situ, the authors took advantage of the surface reactivity of Pt and the poor diffusion of species to and from the thin layer. Thus, a solution of oxalic acid in the electrolyte was placed in the spectroelectrochemical cell, the potential of the platinum working electrode stepped to successively lower values and spectra taken at each step. The spectra were all normalised to the reference spectrum collected at the base potential of 0 V vs. SCE. As a result of the deprotonation of adventitious water ... 

Collect a 128-scan single-beam FTIR spectrum at 4 cm-1 resolution according to the manufacturer s instructions, and save it (Fig. D 1.7.IB). 

Melt calibration standards (from step 1) in a water bath if necessary. Using a disposable pipet, place each standard on the ATR horizontal surface making sure that the surface of the ZnSe or diamond crytal is completely covered, collect a 128-scan single-beam FTIR spectrum (Fig. D1.7.1B) at 4 cm"1 resolution, and save it. Repeat step 5 after each measurement. 

Figure 4.2 Vapor-phase FTIR spectrum of hydrogen chloride, HCl. Spectrum was collected in a 10 cm gas cell with NaCl windows on a Paragon 1000 FTIR spectrometer, PerkinElmer Instruments, Shelton, CT.

Figure 16.29 Gas phase FTIR spectrum of HCl. Spectrum collected on a PerkinElmer Paragon 1000 FTIR by Mr. Mark Bielaska, Rensselaer Polytechnic Institute, Troy, NY. Used with permission.

Fig. 8 An in situ FTIR spectrum of the CO adsorbate at a Ru(0001) electrode in 0.1 M HCIO4 at 10°C. The spectrum, comprising 16 coadded and averaged scans at 8 cm resolution, was collected at 0.2 V versus Ag/AgCl and normalized to the reference taken at -0.2 V.

PM-IRRAS can be implemented using modem commercially available FT IR spectrometers. Indeed, most modern surface IR studies simply use these instruments in conjimction with some form of subtraction. In subtractively normalized FTIR or potential difference IR, a single beam FTIR spectrum Sf is collected at a reference potential E, (at which no Faradic processes occur) and then at successively higher or lower potentials Eg scans Ss are obtained. Then plots (usually overlaid) of AR/R = (Ss — Sr)/Sr are obtained for a range of working potentials. Unlike EMIRS or PM-IRRAS, there is no necessity for the electrode process imder study to be reversible. The method is very populaq capable of investigating... 

Further improved version of the IR-spectrometers is the FTIR (Fourier Transformed IR) unit. FTIR method collects all wavelengths simultaneously and thus making the data collecting process very fast. The output data from the sample is collected using an interferometer and digitized in an interferogram. Fourier transform is then performed on the data to obtain the spectrum. 

Fig. 29 In situ FTIR spectra (256 scans, 8 cm resolution) at Pt(l 11) (left side) and Pt(l00) (right side) in 0.1 M C2H5OH + 0.1 M HCIO4. Reference spectrum collected at 50 mV, and sample spectra collected at the indicated potential in 50 mV steps (some spectra were omitted for clarity). (From Ref [80] with permission.)...

Fig. 3. In situ ATR FTIR spectra of thermal films formed at room temperature and at 150°C and of tribofilms formed during tribotests at room temperature and at 150°C. Iron-coated (lOnm) germanium ATR crystal. Baseline correction was applied. The spectrum collected on undiluted ZnDTP deposited on the iron-coated Ge crystal without sliding or heating is shown for comparison. The normal load was 7N, the Hertzian contact area 0.1 mm, average apparent contact pressure 34MPa, mean sliding velocity 24mm/min.

Fig. 42.7 FTIR residual spectra of water as a function of salinity (mass % NaCl) and heating with respect to the referential spectrum collected at 278 K without salting. Insets show the raw data [86]...

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