Abstract
AbstractSingle step combustion synthesized Cu (5–15 at.-%)/Ce0.8Zr0.2O2 materials containing highly dispersed copper have been assessed for methanol steam reforming (MSR). The activity patterns suggest Cu (10 at.-%)/Ce0.80Zr0.20O2 as the most active formulation, converting ~51% methanol at 300 °C at a gas hourly space velocity of 40,000 h-1 (W/F = 0.09 s). The in situ XPS experiments carried over the most active sample show a sharp falloff of Cu-surface concentration from a considerably high value of 26% before to 7.4% after the in situ MSR tests and it is associated with the complete reduction of oxidized Cu-species (Cu2+) to metallic copper (Cu0). These findings point to the sintering of copper during MSR which is attributed to be responsible for the deactivation observed with time on stream. Interestingly, the MSR activity is shown to be regenerated nearly completely through an intermediate in situ oxidation step in the consecutive cycles of methanol reforming.
Highlights
Hydrogen energy is proven to be a promising alternative to fossil fuels
The in situ X-ray photoelectron spectroscopy (XPS) experiments carried over the most active sample show a sharp falloff of Cu-surface concentration from a considerably high value of 26% before to 7.4% after the in situ methanol steam reforming (MSR) tests and it is associated with the complete reduction of oxidized Cu-species (Cu2+) to metallic copper (Cu0)
We have shown that the solution combustion synthesis is a simple one-step route to prepare Cu-based ceria–zirconia oxides that are active for MSR
Summary
Hydrogen energy is proven to be a promising alternative to fossil fuels. The most potential environment-friendly technology for the production of clean electrical power can be developed by the help of hydrogen-powered fuel cells.[1]. The in situ XPS experiments carried over the most active sample show a sharp falloff of Cu-surface concentration from a considerably high value of 26% before to 7.4% after the in situ MSR tests and it is associated with the complete reduction of oxidized Cu-species (Cu2+) to metallic copper (Cu0).
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