Catalyst Synthesis with Solution Plasma Enhances CO Selectivity in CO2 Hydrogenation Catalyzed by Highly Dispersed Copper in Mixed Zinc–Zirconium Oxides
Catalyst Synthesis with Solution Plasma Enhances CO Selectivity in CO2 Hydrogenation Catalyzed by Highly Dispersed Copper in Mixed Zinc–Zirconium Oxides
研究概述
研究内容请参见论文原文。
谱图与表征信息
Figure 4. Characterization of structures and copper species on catalysts with 0.37 wt % copper loading. (a) Zr 3d XPS data. (b) Estimated Zr3+ content derived from Zr 3d peak fitting. (c) Cu 2p XPS data. (d) Cu K-edge XANES spectra of catalysts and standard references (Cu foil, Cu2O, CuO). (e) Fourier-transformed k2-weighted EXAFS spectra. (f) EXAFS fitting curves for Cu0.37/ZZO-IM and Cu0.37/ZZO-SPP.
Figure 6. (a) CO2 conversion and selectivity characterizing reaction catalyzed by the bare ZZO support and Cux/ZZO-ESPP (reaction conditions: 300 °C and 3 MPa, H2/CO2/N2 = 3:1:1, GHSV = 15,000 cm3 gcat −1 h−1). (b) Comparison of CO-STY values at various reaction temperatures characterizing the Cux/ZZO-ESPP and Cux/ZZO-SPP catalysts investigated in this work with data reported for copper-containing catalysts Cu/ CexMgy,3 Cu−Zn−Al,62 Ni-in-Cu,63 CuOx,64 and Cu/SiO2,65); platinum-containing catalysts (Pt/TiO2,66 Pt/Al2O3,67 Pt/CeO2,68 K80−Pt/L,69), and others (Fe/CeO2,70 Ni/MgAlOx,71 Co−N−C,53) under CO2 hydrogenation conditions. (c) HAADF-STEM image, (d) k2-weighted FT- EXAFS spectra and (e) Cu K-edge XANES of the used Cu0.37/ZZO-ESPP catalyst after a representative catalytic reaction test. (f) CO-STY characterizing Cu2.27/ZZO-SPP and Cu2.27/ZZO-ESPP catalysts determined under various reaction conditions (300 °C, 3 MPa vs 500 °C, 1 bar). (g) Stability test of Cu2.27/ZZO-SPP and Cu2.27/ZZO-ESPP catalysts (reaction conditions: 500 °C and 1 bar, feed composition: 24 vol % CO2 + 72 vol % H2 + 4 vol % N2), GHSV = 1.2 × 105 cm3 gcat