Promoting CO₂ Conversion With Terminal Alkynes Over ZSM-5 Zeolite-Confined Uniform Ag Nanoparticles

Heterogeneous catalysis-mediated terminal alkyne carboxylation enabled the construction of stable C─C bonds via direct C─H bond activation, achieving efficient conversion of CO₂ into unsaturated carboxylic multi-carbon derivatives, and providing a new route for artificial carbon fixation and the synthesis of multifunctional chemicals. However, designing heterogenous catalysts with highly efficient, uniformed, stable active sites for this solid-liquid-gas three-phase systems remained a significant challenge. Herein, we proposed a solvent-assist hydrothermal method to synthesis 6-7 nm uniformed Ag nanoparticles in ZSM-5 (Ag_NP-ZSM5). Ag_NP-ZSM5 exhibited a yield of 90% and a TOF of 306 h^-1 in 4 h alkynes carboxylation reaction. The excellent CO₂ adsorption capacity of ZSM-5, together with the metal-support interaction (MSI) between Ag nanoparticles and the ZSM-5 support, jointly enhanced the intrinsic activity of the alkyne carboxylation reaction. This work not only proposed an innovative strategy for synthesizing uniform nanoparticles within zeolites, but also provided a new approach to facilitate the industrial application of terminal alkyne carboxylation.