This study presents the synthesis and functionalization of urea-based metal-organic frameworks (MOFs), specifically TMU18, TMU19, with a focus on their application to carbon dioxide conversion. MOFs were synthesized using urea-based organic ligands and commercially available pillaring linkers. The frameworks were then functionalized with silver nanoparticles (AgNPs), taking advantage of their structural flexibility for efficient integration. Two approaches were used for the functionalization process: blending AgNPs with pre-synthesized MOFs or involving in situ photochemical synthesis of AgNPs within the pristine MOFs. An investigative study also assessed the impact of AgNPs on MOF crystallization dynamics. The modified MOFs were characterized using Fourier-Transform Infrared Spectroscopy (FTIR), Powder X-ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) analysis. The resulting AgNPs@TMUs were then investigated for their efficacy in the heterogeneous catalytic conversion of CO2, specifically in the carboxylation of terminal alkynes.