TY - JOUR AU - Manundawee, Salamah AU - Arpornwichanop, Amornchai AU - Assabumrungrat, Suttichai AU - Wiyaratn, Wisitsree PY - 2017/06/15 Y2 - 2024/03/28 TI - Two-Dimensional Modeling of the Oxidative Coupling of Methane in a Fixed Bed Reactor: A Comparison among Different Catalysts JF - Engineering Journal JA - Eng. J. VL - 21 IS - 3 SE - DO - 10.4186/ej.2017.21.3.77 UR - https://engj.org/index.php/ej/article/view/1204 SP - 77-99 AB - <p>A proposed two-dimensional model of the oxidative coupling of methane (OCM) to C<sub>2</sub> hydrocarbons (e.g., C<sub>2</sub>H<sub>4</sub> and C<sub>2</sub>H<sub>6</sub>) in a fixed bed reactor operated under isothermal and non-isothermal conditions is described which can provide more accurate predictions of experimental data than the simplified one-dimensional model. The model includes a set of partial differential equations of the continuity, mass transfer and energy balance equations. The performance of the OCM using different catalysts was assessed in terms of CH<sub>4</sub> conversion, C<sub>2</sub> selectivity and C<sub>2</sub> yield with respect to key operating parameters, such as feed temperature (973 - 1173 K), CH<sub>4</sub>/O<sub>2</sub> ratio (3.4 – 7.5) and gas hour space velocity (GHSV) (18000 - 30000 h<sup>-1</sup>). The simulation results indicated that the Na-W-Mn/SiO<sub>2 </sub>catalyst exhibits the best performance among all of the catalysts. The C<sub>2</sub> yield were 20.16% and 20.00% for non-isothermal and isothermal modes respectively which the OCM reactor is operated at a CH<sub>4</sub>/O<sub>2</sub> ratio of 3.4, a feed temperature of 1073 K and a GHSV of 9720 h<sup>-1</sup>. An increase in the operating temperature increases the CH<sub>4</sub> conversion but decreases the C<sub>2</sub> selectivity. However, the effects of the CH<sub>4</sub>/O<sub>2</sub> ratio and the GHSV exhibit an opposite trend to that of the operating temperature.</p> ER -