Ag-promoted TiO2 nanoparticles immobilized over the cordierite monolithic support for dynamic and selective photo-reduction of CO2 to CO by the use of hydrogen has been investigated. Ag-loaded TiO2 NPs synthesized by a facile sol-gel method were coated over the monolith channels by dip-coating method. The samples were characterized by XRD, Raman, FTIR, SEM, TEM, XPS, N-2 adsorption-desorption, UV-Vis and PL spectroscopy. The photo-activity test of Ag-modified TiO2 NPs was conducted for dynamic photocatalytic CO2 reduction with H-2 as a reductant via a reverse water gas shift (RWGS) reaction in a cell type and monolith photo-reactors. Using 5 wt. % Ag/TO(2)NPs, CO2 was energetically converted to CO with a yield rate 1335 mole g-catal(-1) h(-1), a 111 fold-higher than the amount of CO produced over the pure TiO2 catalyst. More importantly, photo-activity of Ag/TiO2 catalyst for CO evolution can be improved by 209 fold using monolith photo-reactor than the cell type reactor under the same operating conditions. This enactment was evidently due to the efficient light harvesting with larger illuminated surface area inside monolith micro channels and efficient charges separation in the presence of Ag-metal. The reusability of Ag/TiO2 NPs loaded over the monolithic support showed favorable recycling capability than the catalyst dispersed in a cell reactor. A possible reaction mechanism for this observation has been discussed in detail. (C) 2017 Hydrogen Energy Publications LLC. Published by. Elsevier Ltd. All rights reserved.