Metal-organic　frameworks　(MOFs)　have　shown　great　promise　for　CO2　capture　and　storage.　However,　the　operation　of　chemical　redox　functions　of　framework　substances　and　organic　CO2-trapping　entities　which　are　spatially　linked　together　to　catalyze　CO2　conversion　has　had　much　less　attention.　Reported　herein　is　a　cobalt-containing　zeolitic　imidazolate　framework　(Co-ZIF-9)　which　serves　as　a　robust　MOF　cocatalyst　to　reduce　CO　2　by　cooperating　with　a　ruthenium-based　photosensitizer.　The　catalytic　turnover　number　of　Co-ZIF-9　was　about　450　within　2.5　hours　under　mild　reaction　conditions,　while　still　keeping　its　original　reactivity　during　prolonged　operation.　Splitting　up:　A　cobalt-containing　zeolitic　imidazolate　framework　(Co-ZIF-9)　has　been　used　as　a　stable　metal-organic　framework　cocatalyst　with　a　photosensitizer　to　reduce　CO2.　It　combines　benefits　of　the　nanoporous　characteristic　of　Co-ZIF-9　for　CO2　capture/activation　and　the　catalytic　redox　function　of　cobalt　centers.　bpy=2,2′-bipyridine,　TEOA=triethanolamine.　Copyright　©　2014　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.