Oxidative coupling of methane over Mn–Na2WO4/SiO2 catalyst with continuous supply of alkali chloride vapor

Optimizing the Reaction Performance of La2Ce2O7‐Based Catalysts for Oxidative Coupling of Methane (OCM) at Lower Temperature by Lattice Doping with Ca Cations

“…[2][3][4] Mn/Na 2 WO 4 /SiO 2 and its promoted forms have both good catalytic performance and long-term stability. [5][6][7][8][9][10][11][12][13][14] However, the property of the active sites in this complicated catalyst has not yet been understood very clearly. Additionally, on this catalyst, OCM reaction can only take place efficiently above 800°C.…”

“…Although Li/MgO exhibits good initial catalytic performance, its stability is suffered from the vaporization of Li + cations, the structure modifier, at elevated temperatures . Mn/Na 2 WO 4 /SiO 2 and its promoted forms have both good catalytic performance and long‐term stability . However, the property of the active sites in this complicated catalyst has not yet been understood very clearly.…”

Oxidative coupling of methane on cordierite monoliths coated with Sr/La2O3 catalysts. Influence of honeycomb structure and catalyst-cordierite chemical interactions on the catalytic behavior

“…These components reach film surface, being responsible for the catalytic activity increase. It is well known that Mg and Si are active components in the OCM reaction [29][30][31]. This phenomenon could also be the explanation of C2 activation during the catalytic test.…”

Synthesis of Value-Added Chemicals via Oxidative Coupling of Methanes over Na2WO4–TiO2–MnOx/SiO2 Catalysts with Alkali or Alkali Earth Oxide Additives

“…The addition of those components into Na 2 WO 4 −MnO x led to the discovery of important information about the catalysts for the OCM reaction. For instance, (i) adding the catalyst with La 2 O 3 caused an increase in the oxygen concentration of the catalyst's surface, thereby increasing the catalytic activity; 26 (ii) adding a coactive metal (such as Pt, Ir, or Rh metal) led to the finding that the W concentration of the catalyst's surface increased, thereby improving the catalytic activity; 8 (iii) using alkaline chlorides (e.g., NaCl or KCl) as promoters enhanced the CH 4 conversion by which the alkaline chlorides generate a chloride radical so that CH 4 activation was enhanced; 31 (iv) introducing an additive (such as TiO 2 ) into the catalyst promoted low-temperature catalytic activity for the OCM reaction because of the formation of the MnTiO 3 phase; 25 and (v) adding a Ce promoter to the catalyst resulted in increased activity and stability by preventing catalyst sintering. 27 Previous results reported in the literature showed that the Na 2 WO 4 −MnO x /SiO 2 catalyst is highly active for OCM reaction.…”