Numerical investigation on the heterogeneous pulsed dielectric barrier discharge plasma catalysis for CO<sub>2</sub> hydrogenation at atmospheric pressure: Effects of Ni and Cu catalysts on the selectivity conversions to CH<sub>4</sub> and CH<sub>3</sub>OH
Jun Du, Lijun Zong, Shuai Zhang, Yuan Gao, Liguang Dou, Jie Pan, Tao Shao
Abstract
Abstract The simulation model of the pulsed dielectric barrier discharge plasma catalytic CO 2 hydrogenation is established to numerically investigate the effects of Ni and Cu catalysts on the selectivity conversions to CH 4 and CH 3 OH. Under plasma without catalyst, the electron impact CO 2 and CO produce CO and C, and then stepwise hydrogenations of CO and C generate CH 3 OH and CH 4 . Under plasma with Ni catalyst, Langmuir–Hinshelwood (LH) reactions mainly form the CH x (s) and Eley–Rideal (ER) reaction CH 3 (s) + H → CH 4 are the key paths of CH 4 synthesis. Under plasma with Cu catalyst, the intermediate CH 3 O(s) is principally produced by the LH reaction between CH 2 O(s) and H(s), followed by the ER reaction CH 2 O(s) + H → CH 3 O(s). While CH 3 OH(s) is mainly produced by the ER reaction CH 3 O(s) + H → CH 3 OH(s), CH 3 O(s) + H(s) → CH 3 OH(s) + S is a rate‐limiting step owing to the higher reaction energy barrier.