 The study demonstrates the hydrogenalysis of various polyamides catalyzed by platinum group metal nanoparticles supported on CO2, with IU-CEO2 being selective for converting all polyamides into water, ammonia, and methane, while PT-CEO2 yields hydrocarbons retaining the carbon backbone of the parent polyamide. Density functional theory computations reveal that PD nanoparticles require higher activation energy for carbon-carbon bond cleavage than IU nanoparticles, explaining the observed selectivity. The high activity and product selectivity of both catalysts were maintained when converting real-world polyamide products such as fishing net. This article was authored by Shin Bang Wu, Wei ETSC Lee, Roland C. Turner-Ritzen and others.