OCM reactor system containing a multi component catalyst system

A reactor system for oxidative coupling of methane (OCM), comprising:

• a) an inlet configured to receive a reactant mixture;
• b) a reaction chamber having an upstream end and a downstream end such that the reaction chamber extends from the upstream end to the downstream end, wherein the reaction chamber comprises a catalyst bed having a catalyst composition having at least two catalyst components:
• i. a low selectivity catalyst component;
• ii. a high selectivity catalyst component;
• c) an outlet configured to recover a C2+ hydrocarbon product mixture from the reactor system;
• wherein the reactor system is configured such that the reactant mixture substantially contacts the high selectivity catalyst component prior to contacting the low selectivity catalyst component and wherein (a) the high selectivity catalyst component is represented by a general formula (I):
• (AEaRE1bRE2cATdOx)/MmOn, and (b) the low selectivity catalyst component is represented by a general formula (II):
• (AM)z-(AEaRE1bRE2cATdOx)/MmOn;
• wherein, (i)‘AE’ represents an alkaline earth metal;
• (ii)‘RE1’ represents a first rare earth element;
• (iii)‘RE2’ represents a second rare earth element;
• (iv) ‘AT’ represents a third rare earth element ‘RE3’, or a redox agent ‘RX’ selected from antimony, tin, nickel, chromium, molybdenum, tungsten, manganese, bismuth;
• wherein, ‘a’, ‘c’, and ‘d’ each independently represent relative molar ratio;
• wherein ‘a’ ranges from 0.1 to 5;
• ‘b’ ranges from 0.1 to 10;
• ‘c’ ranges from 0.01 to about 10;
• ‘d’ ranges from 0.01 to 10;′x′ balances the oxidation state;
• wherein, the first rare earth element, the second rare earth element and the third rare earth element, are different;
• (v) ‘AM’ represents a metal promoter selected from Group 4 to Group 12 of the Periodic Group of Elements;
• (vi) ‘z’ represents the amount of metal promoter present in the low selectivity catalyst component and ‘z’ ranges from 0.01 wt. % to 1.0 wt. % with regard to the weight of the low selectivity catalyst component;
• and (vii) ‘MmOn’ represents an oxide catalyst support, wherein ‘M’ is selected from a metal or silicon;
• ‘m’ and ‘n’ are any positive integers and ranges from about 1 to about 5.