EPR characterization of Cu/Al‐Zr‐Ce ethanol dehydrogenation catalysts: Active site development and coking control

Abstract

Electron paramagnetic resonance (EPR) spectroscopy was applied to study structure–performance relationships for copper‐containing catalysts based on Al‐Zr‐Ce mixed oxides with various oxide support synthesis temperature. In situ EPR showed that the state of Cu2+ sites depends on the phase composition of the support, temperature, as well as the presence of the reaction medium during catalysis.

CO2 Reforming of Ethanol over Ni/Al2O3-(Zr–Yb)O2 Catalysts: The Effect of Zr:Al Ratio on Nickel Activity and Carbon Formation

“…Previously, in our studies, we have also successfully applied EPR spectroscopy for the detection of amorphous carbon radical signal (narrow signal with g-value ∼2.01). 86 No amorphous carbon radicals were detected by EPR spectroscopy in this study for Ni/AZ. Raman spectroscopy was applied to determine the effect of reaction mixture composition on samples after catalysis: at CO 2 /Ethanol ratios = 1:1 (the samples denoted as Ni/AZ-1:1) and at CO 2 / Ethanol = 1.4:1 (the samples denoted as Ni/AZ-1:1.4).…”

“…Raman spectroscopy analysis was carried out for the carbon formation control. Previously, in our studies, we have also successfully applied EPR spectroscopy for the detection of amorphous carbon radical signal (narrow signal with g-value ∼2.01) . No amorphous carbon radicals were detected by EPR spectroscopy in this study for Ni/AZ.…”