Hydrogenation of carbon dioxide (CO 2 ) to ethylene (C 2 H 4 ) can be achieved in two routes via tandem reactions: (1) CO 2 hydrogenation to methanol (CH 3 OH) followed by methanol-to-olefin conversion and (2) reverse water-gas shift reaction followed by Fischer−Tropsch synthesis. Here we present another tandem route for CO 2 -to-C 2 H 4 conversion via (3) CO 2 hydrogenation to ethanol (C 2 H 5 OH) followed by C 2 H 5 OH dehydration. Multiple cuprous (Cu I ) centers were loaded onto the Ti 8 (μ 2 -O) 8 (μ 2 -OH) 4 secondary building units of a Ti-based metal−organic framework (MOF), MIL-125-NH 2 , via deprotonation and ion exchange of the μ 2 -OH groups. These multiple Cu I centers catalyzed CO 2 hydrogenation to C 2 H 5 OH, while the Ti 2 -μ 2 -O − M + (M + = H + , Li + ) sites converted C 2 H 5 OH to C 2 H 4 . The MOF achieved CO 2 -to-C 2 H 4 generation rates of up to 2598 μmol g Cat −1 h −1 in supercritical CO 2 (CO 2 30 MPa, H 2 5 MPa) at 85 °C and 514 μmol g Cat −1 h −1 in the gas phase at 5 MPa (H 2 :CO 2 = 3) and 100 °C, respectively. This work opens another path to selectively producing C 2 H 4 via the hydrogenation of CO 2 .