Rate of CH3Cl consumption as a function of the CO partial pressure (PCO). Arrhenius plots are shown as inset; Reaction conditions: CH3Cl:CO:Ar:He=10:0-30:15(0):60-80,T=673 K,GHSV=24000 cm3h-1gcat-1and CH3Cl:CO:Ar:He=5:0(15):(15)0:80,GHSV=45600 cm3h-1gcat-1for Arrhenius plots