In this work, oxidative coupling of methane over Mn/Na2WO4/SiO2 catalyst is studied in a two-zone fluidized-bed reactor (TZFBR) and its performance is compared with a fluidized-bed reactor (FBR). Diluted oxygen in argon was introduced into the bottom of the TZFBR through a quartz ferrite and methane was entered at higher positions along the fluidized bed. The catalyst circulated between the oxygen-rich and methane-rich zones in the TZFBR reactor. The effects of the main operating variables including bed temperature, the methane/oxygen ratio (R-mo), and the height at which methane was introduced into the reactor (H-m) were investigated. It is found that under some operating conditions the TZFBR gives a higher C-2 selectivity than that obtained in the FBR reactor. Reaction of methane with lattice oxygen of the Mn/Na2WO4/SiO2 redox catalyst in the methane-rich zone may have led to the higher selectivity. (C) 2009 Elsevier B.V. All rights reserved.