Przemysl Chemiczny, Vol.82, No.8-9, 624-626, 2003
Evaluation of the possibilities of improving the selectivity and yield of ethylene in oxidative coupling of methane by the use of chloromethanes
A (10:1 v/v) CH4-O-2 mixture containing 300-600 ppm of CCl4, CHCl3 or CH2Cl2 was made to react (75 mL/min, one-pass, time of contact 0.4 s.g/mL, 800degreesC) over 0.5 g of a 3%Na/CaO, or 1.7%Na/La2O3, or 1.7%Na/(15%Mn)MnOxSiO2 or a 5%Na2WO4/(2%Mn)MnO/SiO2 catalyst. The chloromethanes raised the selectivities toward C2+ and C2H4 to 88-90 and 50-52%, resp., and C2H4 concentration from 2.2 to 3+%, and suppressed CO2 from 10-15 to 10%. At >600 ppm, conversions of major reactants were decreased, CCl4 caused deepest deactivation of Na/CaO (-CaCl2?).