CO2 hydrogenation to methanol over Pd/MnO/In2O3 catalyst

Synthesizing methanol from CO 2 and green hydrogen is a promising strategy to solve environmental issues and meet the increasing energy demand. In this work, Pd/MnO/In 2 O 3 catalyst with highly dispersed Pd species was prepared via an in-situ reduction method using NaBH 4 as the reducing agent. The highly dispersed Pd species promoted the dissociative of hydrogen and the hydride species could spill over to the MnO/In 2 O 3 due to the strong metal-support interaction between Pd and MnO/In 2 O 3 , which improved the catalytic activity of Pd/MnO/In 2 O 3 for CO 2 hydrogenation to methanol. As a result, the methanol space-time yield of 1 wt% Pd/MnO/In 2 O 3 was 4.8 times higher than that of MnO/In 2 O 3 . Moreover, the methanol selectivity of 1 wt% Pd/MnO/In 2 O 3 was still higher than 70% at a temperature below 280 °C. The present in-situ reduction method is an effective route for the preparation of Pd/MnO/In 2 O 3 catalyst for CO2 hydrogenation to methanol. • Pd/MnO/In 2 O 3 catalyst is used for CO 2 hydrogenation to methanol. • Pd can be highly dispersed on MnO/In 2 O 3 via an in-situ reduction method. • Highly dispersed Pd species enhances the dissociative of hydrogen. • Pd increases the methanol space-time yield of MnO/In 2 O 3 by more than four times.