Generation of dielectric barrier discharge in high-pressure N 2 and CO 2 environments up to supercritical conditions

Abstract

The generations of dielectric barrier discharge (DBD) in high-pressure nitrogen and carbon dioxide environments up to supercritical conditions with or without flow fields were performed. From the second positive system of nitrogen, the rotational temperature of N 2 was estimated to be approximately 400 K under a supercritical N 2 condition (4 MPa and 313 K). On the other hand, from emission spectra of DBD in a high-pressure CO 2 environment (1–8 MPa), C 2 and O spectra were remarkable in intensity instead of CO, CO +, CO 2 and CO 2 + spectra that were remarkable at atmospheric pressure. Furthermore, porous carbon film synthesis by DBD under a supercritical CO 2 condition (7.5 MPa and 305 K) was also identified by scanning electron microscopy observation.