Abstract

Replacing ZnO with g-C3N4-ZnO hybrid in Cu/ZnO/Al2O3 catalysts for CO2 hydrogenation leads to enhanced methanol yield and selectivity, which shows a volcano-type relationship with g-C3N4 amount (0–15wt% in g-C3N4-ZnO) in Cu/g-C3N4-ZnO/Al2O3 catalysts with the highest improvement at 5wt% g-C3N4. The methanol space-time yield reaches 5.73mmolh−1gCu−1 (12bar, 250°C) for Cu/5wt%g-C3N4-ZnO/Al2O3, superior to the highest methanol yield (5.45mmolh−1gCu−1) of industrial catalyst HiFUEL-R120 obtainable under the same pressure. Time-resolved photoluminescence, electronic spin resonance and temperature-programmed reduction characterizations support the promotion from enhanced strong metal-support interaction in modified catalysts caused by introduced electron-rich support.

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