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The microstructure of the CO2-selective self-activating and self-stabilizing Cu–Zr bimetallic compound Cu51Zr14 has been studied by a combination of high-resolution electron microscopy and energy-dispersive X-ray spectroscopy both before and after entering the CO2 selective state in methanol steam reforming. Prior to catalysis, the phase composition of the catalyst is characterized by a microstructural mixture of Cu51Zr14 and metallic Cu. The structure appears in a distinct needle-like morphology with a characteristic microstucture of small Cu particles embedded in the intermetallic matrix. In contrast, entering the CO2-selective state goes along with oxidative decomposition—investigated by differential thermal analysis (DTA), thermogravimetry (TG), and mass spectrometry (MS)—and therefore massive structural and compositional changes of the Cu51Zr14 compound both in the near-surface and bulk regions. The final state is then composed of a structurally very heterogeneous sample with Zr-rich and Cu-rich regi...

Microstructural and Chemical Evolution and Analysis of a Self-Activating CO2-Selective Cu–Zr Bimetallic Methanol Steam Reforming Catalyst

Microstructural and Chemical Evolution and Analysis of a Self-Activating CO₂-Selective Cu–Zr Bimetallic Methanol Steam Reforming Catalyst