结论 综上所述,本研究设计并合成了超低温CO2甲烷化催化剂。TEM、XPS和Py-IR等表征显示了SMSI和氧空位的调控,这进一步影响了活性位点的局部电子密度。此外,还会影响CO2和H2解离的化学吸附和活化,从而通过不同的反应途径影响催化效果,即从...
The formula that relates the size of sub-micrometre crystallites in a solid to the broadening of a peak in an X-ray diffraction pattern. Semiconductor energy band gap The energy difference between the valence band maximum and the conduction band minimum of a semiconductor. Thermal catalysis The ...
5a). In the case of the photoreaction under 13CO2, the peak intensity of the carboxyl carbon clearly increased, suggesting that the carboxyl moiety in DBA originates from CO2 (Fig. 5b)14,65. Figure 5 13C NMR (CD3CN, 126 MHz) spectra of the photochemical product (λex = 300...
Their high peak powers and repetition rates further enhance productivity. c. **Efficiency and Reliability:** The RF excitation mechanism ensures efficient energy transfer to the lasing medium, resulting in superior electrical-to-optical conversion efficiencies (typically around 10-20%). Moreover, the...
A correlation between the intensity of the IR peak at 1609 cm 1 and cyclic carbonate yield has been observed. The cyclic carbonate yields were higher when both the acid and base functionalities were present on the surface. The Ti- and Al-SBA-15 functionalized with adenine exhibited the ...
In the presence of 18-crown-6, D2O forms a 1:1 complex with the macrocyclic molecule in supercritical fluid CO2 with two different configurations. The D2O molecule can be bonded to two oxygen atoms of the crown cavity in a bridged configuration that is characterized by a broad peak at 2590...
A peak C2H4 FE of 58% and a partial current density of 78.3 mA·cm−2 at −1.02 V were obtained. In flow cells, Cu-DS enhanced the alcohol-to-ethylene ratio by ∼54 folds compared with Cu-C. To demonstrate a stable and productive CO2-to-alcohol conversion, we operated a ...
By measuring the IR peak areas of the adsorbates on the sorbent in contact with the gas mixture, the actual amounts of the sorbate can be determined. The method is fairly simple, quick, and accurate even at low concentrations provided the adsorbates exhibit strong distinct peaks and the ...
FT-IR analysis show that the position of –OH and C-O-C stretching vibration peak were shifted and, XPS analysis indicate that the surface chemical elements of cotton fiber were changed. Furthermore, after uptake and fixation treatments in supercritical CO2, the ...
1r. Besides, an energy loss-peak at 285 eV induced by transitions from 1s to π* molecular orbital in carbon due to the presence of sp2 carbon, and a transition from 1s to σ* in carbon at 295 eV49, were observed in both central and peripheral parts. It indicated a similar ...