Co-reactions were conducted using 13C-labeled methanol and natural abundance acetaldehyde, and the resulting surface species were monitored at various temperatures (Fig. 3a, right). At room temperature (293 K), the 13C NMR spectrum reveals the presence of adsorbed methanol (45-53 ppm), ...
two redox peaks of CoPc/MWCNT appeared under the Ar atmosphere. The first reversible peak at around 0.20 V vs. RHE arises from the reduction of Co(II) to Co(I), while the second reduction peak
surface species on the catalyst were followed using IR spectroscopy (Thermo Nicolet iS50 equipped with MCT detector). Spectra resolution was set to 4 cm−1, spectra were acquired each 6 s with 4 scans per each spectrum. In the MS, the ion signals form/z = 40 (Ar tracer), ...
However, if proteins and lipids are not sufficiently removed from the sample before one-dimensional (1-D) proton-nuclear magnetic resonance (1H-NMR) spectroscopy, the resulting spectrum cannot be reliably quantified. This is because broad, low intensity peaks produced by macromolecules disrupt the ...
Figure 6.FT-IR difference spectra of methyln-hexanoate adsorption on H-ZSM-5 SAR80 zeolite at 110 °C collected once per minute. The arrows indicate change in the spectrum over time. The decrease in the intensities of the observed frequencies (i.e., negative peaks) at 3740 cm−1, ascr...
Figure 6.FT-IR difference spectra of methyln-hexanoate adsorption on H-ZSM-5 SAR80 zeolite at 110 °C collected once per minute. The arrows indicate change in the spectrum over time. The decrease in the intensities of the observed frequencies (i.e., negative peaks) at 3740 cm−1, ascr...
Conversely, in the IR spectrum of the post-reaction MOF a 𝜈𝑂𝐻νOH band at 3682 cm−1−1 and three new 𝜈𝐶𝐻νCH peaks appear (at 2904, 2876, and 2802 cm−1−1) which correlate with methanol formation quantified by means of 11H-NMR spectroscopy after washing the ...
The core level spectrum of Sn 3d for Pd-Sn/CNFs is shown in Figure 4C. The core level has two prominent peaks which correspond to the spin-orbit components of Sn 3d5/2 and 3d3/2. On the low binding energy side of the primary peak, both have a well-defined low-intensity shoulder....
The N 1s spectrum shows the peak centered at 398.9 eV, 399.0 eV and 401.8 eV, which are assigned to pyridine-N, Co-Nx and pyrrole-N, respectively. Among them, The Co-Nx bond serves as a good catalytic site and has a significant impact on electrochemical catalytic activity [45]. The ...
At 773 K, due to the precipitation of CuCrO2 after catalysis, the peaks of the copper (111) and (200) planes can be observed at 2θ = 43.297° and 50.433° (PDF#04-0836), respectively. Figure 3. XRD pattern of CeO2-CuCrO2 nanofibers after SRM at different temperatures. 3.2. FE...