Abstract
Reduced graphene oxide aerogel (rGOae) was synthesized via hydrothermal reduction and following freeze-drying method. The as-prepared material was then used as a novel support of Cu-Zn/rGOae catalyst for the direct CO2 hydrogenation to methanol. Moreover, in situ X-ray absorption near-edge structure (XANES) spectroscopy was applied to evaluate the oxidation state of the Cu and Zn species during the H2 reduction process at 350°C with a holding time of 90min. The effects of the hydrothermal reduction temperature of rGOae support and Cu-Zn metal loading contents were investigated. Interestingly, the hydrothermal reduction at 140°C provided the highest surface area (458m2g−1), and 15wt%Cu-Zn/rGOae catalyst achieved the highest methanol production (94.53mgMeOHgcat−1h−1) at a reaction temperature of 250°C and pressure of 15bar.
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