Enhanced carbon dioxide reduction reaction (CO2RR) with suppressed HER was achieved on polytetrafluoroethylene (PTFE) coated Cu nanoneedles (CuNNs).

N2O formation over Cu-SSZ-13 during selective catalytic reduction (SCR) of NOx with NH3 under different conditions was experimentally investigated based on a flow reactor and in situ diffused reflectance infrared Fourier transform spectroscopy experiments. The results show that the NSCR and the nonselective NH3 oxidation are the major pathways for N2O formation over Cu-SSZ-13. N2O formation at low and high temperatures usually occurs via different mechanisms. The N2O formation at low temperatures is mainly ascribed to the decomposition of NH4NO3, which mainly forms on Cu­(OH)+, while at high temperatures, N2O is formed because of the NH3 oxidation by O2 and NOx. Besides, the effect of ANR, NO2/NOx ratio, and O2 and H2O concentrations on N2O formation were also studied. They all affect N2O formation, and the effects on the two mechanisms are totally different at low and high temperatures.

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The impact of hydrothermal aging on SO2 poisoning over Cu-SSZ-13 selective catalytic reduction (SCR) catalysts were investigated in this study. The catalyst samples were hydrothermally aged at various temperatures for SO2 poisoning and characterized by SO2 temperature-programmed desorption (SO2-TPD), X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), and NH3-TPD. The performance evaluations were also performed to illustrate the impact on SCR activity and oxidation. The results showed that the Cu-SO4-like species decreased in the 750 °C aged sample via copper migration, while they increased in the 850 °C aged sample due to CuOX/CuAlOX formation. The low-temperature SCR activity and oxidation decreased due to sulfur poisoning. For the sulfated sample, however, it was determined that NOX conversion was slightly higher on the mildly hydrothermally aged sample. Furthermore, desulfation is easier for the mildly hydrothermally aged sample but more difficult for the severely hydrothermally aged sample.

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This work demonstrates a novel high-throughput (HT) microfluidics-enabled uninterrupted perfusion system (HT-µUPS) and validates its use with chronic all-optical electrophysiology in human excitable cells. HT-µUPS consists of a soft multichannel...

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Curved organic small molecule and single-walled carbon nanotube composites with enhanced interactions for thermoelectric materials.