Impact of Yttria-Stabilized Zirconia on Direct CO, Hydrogenation to Light Olefins over a Tandem Catalyst Composed of ln_2O_3/YSZ and SAPO-34

摘要

Direct carbon dioxide (CO_2) conversion to light olefins via a methanol (MeOH) intermediate route by a tandem catalyst is an attractive approach for CO_2 reduction. Developing a tandem catalyst for CO_2-to-MeOH and MeOH-to- olefins reactions is challenging due to the differences in thermodynamics and reaction kinetics of each reaction. Herein, we report a highly stable In_2O_3/YSZ//SAPO-34 tandem catalyst for direct CO_2 hydrogenation to light olefins. Compared to the ZrO_2 support, In_2O_3 supported on yttria-stabilized zirconia (YSZ) presents a stable light olefin selectivity without increasing CO production. The high oxygen vacancy concentration in YSZ can promote the adsorption of reactants and inhibit the hydroxylation of metal oxides. In addition, the strong metal-support interaction of In_2O_3/YSZ can prevent the over-reduction of indium species, maintaining the oxidation states of active sites for MeOH production. Our results show that YSZ has advantageous effects on indirect CO_2 activation and can be a promising application for CO_2 hydrogenation to high-value-added chemicals.