Plasma-Driven Hydrocarbon Polymerization (PDHP): Harnessing Non-Equilibrium Kinetics for Selective Aromatization – A Perspective on Advancing Plasma Chemistry

This manuscript presents an innovative perspective on Plasma-Driven Hydrocarbon Polymerization (PDHP), a novel technology designed to convert light hydrocarbons (such as methane) into high-value aromatics (Benzene, Toluene, Xylene - BTX) with high efficiency and selectivity under ambient conditions. The approach overcomes the inherent limitations of traditional thermal processes, including high energy consumption, elevated temperatures, and limited selectivity. The core innovation of PDHP lies in engineering non-equilibrium plasma kinetics to create a bimodal, non-Maxwellian electron energy distribution function (EEDF). This dual distribution enables two distinct electron populations: "hot" electrons (10–60 eV) that selectively dissociate C-H bonds to produce desired radical intermediates, and "cold" electrons (0.5–3 eV) that induce molecular vibrations to promote radical coupling and aromatic ring formation without causing further fragmentation. To maximize selectivity, this process is synergistically integrated with advanced catalysts, such as zeolites (e.g., ZSM-5) functionalized with metallic nanoparticles (e.g., Au or Ga). This plasma-catalyst synergy directs the reaction pathway towards cyclization, achieving BTX selectivity exceeding 75%, a significant improvement over conventional thermal methods. The manuscript also addresses key challenges, including plasma instabilities and industrial scalability. It proposes advanced solutions such as the use of modulated magnetic fields and artificial intelligence (AI) algorithms, specifically reinforcement learning, to achieve real-time control and stabilization of the process. In conclusion, PDHP is positioned as a revolutionary approach in green chemistry. It offers a sustainable, low-energy pathway for producing essential platform chemicals, opening new avenues for decarbonizing the natural gas sector and valorizing waste hydrocarbon streams.