In situ Raman spectroscopy of plasma-catalyst interface for conversion of CO₂ and CH₄ to valuable compounds

Atsushi Saito^{1, 2}, Zunrong Sheng¹, Tomohiro Nozaki ^{1, *}

^* The author to whom correspondence should be addressed.

¹ Department of Mechanical Engineering, Tokyo Institute of Technology, Japan
² AGC Inc., Japan

Abstract

This study demonstrates the reduction of carbon dioxide (CO₂) via a plasma-catalyst hybrid process in the presence of methane (CH₄) and hydrogen (H₂). Dielectric barrier discharge (DBD) plasma-activated Ar/CO₂/CH₄/H₂ was applied to copper nanoparticles supported on zinc oxide (ZnO). The surface species and their reaction pathways were investigated via in situ Raman spectroscopy under DBD irradiation. The Raman shift peaks were identified from literature review and density functional theory (DFT) calculations. Acetate (CH₃COO) was produced as the reaction product via a DBD -induced surface reaction. In addition, acetaldehyde (CH₃CHO) was produced by irradiation with DBD -activated H₂O. The conversion of CO₂ and CH₄ to valuable compounds was evaluated via in situ observations, and the reaction pathway was examined.

Keywords - CO₂ conversion, carbon recycling, in situ Raman spectroscopy, plasma catalysis.

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