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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...
With the introduction of Ga3+ into Cu/ZnO catalyst precursors, a series of catalysts have been prepared using a simple co-precipitation method and tested as catalysts for the synthesis of methanol from CO2 hydrogenation. It is found that the presence of a small amount of Ga3+ can facilitate thermal deep reduction of ZnO support to Zn atoms under hydrogen prior to catalysis; hence, a highly active...
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