Synergistic Conversion of Isopentane by Non-Thermal Plasma and Mn-based Catalysts: Insights into Mechanisms and Efficiency Enhancement

This study explores the use of non-thermal plasma (NTP) coupled with catalysis as an effective solution for VOCs degradation. Specifically, MnO₂-Co₃O₄-Al₂O₃ catalysts were synthesized and tested for their ability to degrade isopentane. Experimental results demonstrated that the coupling of NTP with the catalyst significantly enhanced isopentane conversion, which can reach 99% isopentane conversion and 72.6% mineralization rate, while suppressing Ozone (O₃) emissions to <1 μL/L. Furthermore, the energy utilization efficiency was substantially improved, achieving a maximum efficiency of 400 g kWh^-1. Theoretical calculations and in-situ experiment reveal that acetone is the key intermediate product in the degradation of isopentane, and its formation and oxidation are essential steps for the mineralization of isopentane. Mn-Co doping lowers the formation barriers of ·OH and ¹O₂ to 2.8-3.5 eV, thus facilitating acetone intermediate generation and C-C bond cleavage. This work establishes a dual strategy of oxygen-vacancy engineering and plasma-catalyst synergy for efficient VOCs elimination.