Dissociation of CO₂ in non-thermal atmospheric pressure planer dielectric barrier discharge.

Increasing concentration of carbon dioxide ( CO 2) in Earth's atmosphere due to burning of fossil fuels is a major cause of global warming. To avoid catastrophic consequences of increasing global temperature, the conversion of CO 2 is vital. Incidentally, synergistic effect of Ba 0. 7 Sr 0. 3 TiO 3 photocatalyst on CO 2 dissociation in atmospheric pressure planer dielectric barrier discharge is investigated. Maximum dissociation fraction of 37% is achieved in undiluted CO 2 , 49% in CO 2 + Ar and 44% in CO 2 + He at 10 kV applied voltage with 10 kHz fixed frequency and 200 SCCM total flow rate. Transitions from the Angstrom band of CO at 483.5 nm and the 2nd positive system of N 2 at 380.4 nm are used for molecular actinometry measurements. Rotational temperature is calculated, by employing the Boltzmann plot technique, using rotational spectra of Q-branch of CO (0-1) Angstrom band. To avoid inconsistency in rotational temperature measurement, rotational spectra of 1st negative system of N 2 (0-0) band are also used. For this, synthetic spectra have been fitted over experimentally recorded spectra of 1st negative system of N 2 (0-0) band using LIFEBASE software. Electrical characterization of the discharge suggests that power added to the plasma increased from 1.92 to 6.13 W in undiluted CO 2 , from 1.81 to 6.4 W in CO 2 + He and from 1.71 to 7 W in case of CO 2 + Ar mixture plasma. A higher dissociation fraction is found in the case of CO 2 − N 2 ∕ Ar mixture. [ABSTRACT FROM AUTHOR]