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The oxidative coupling of methane (OCM) is a potential option for conversion of excess natural gas to higher value products or useful feedstocks. The preferred or ideal OCM stoichiometry is: 2CH 4  + O 2  → C 2 H 4  + 2H 2 O, but real OCM produces a variety of species. Using a detailed mechanism from the literature for OCM over a La 2 O 3 /CeO 2  catalyst that combines coupled elementary gas phase and surface reactions, a reactor engineering study has been done. Adiabatic packed bed reactor (PBR, modeled as plug flow) and continuous stirred tank reactor (CSTR, perfect mixing) simulations using this mechanism are presented. Each reactor simulation used the same total number of catalyst sites. Process variables included CH 4 /O 2  feed ratio (7, 11), feed temperature (843–1243 K), and feed rate. All runs were conducted at 1.01E5 Pa pressure. The results show the CSTR produces high conversions at much lower feed temperatures than those required by the PBR. Once full PBR “light off” occurs, however, its CH 4  conversions exceed CSTR. The simulations reveal OCM over this catalyst at these conditions gives a mixture of synthesis gas (CO, H 2 ) and C 2 H x  (primarily C 2 H 4  plus small quantities of C 2 H 6  and C 2 H 2 ). The CSTR favors the production of synthesis gas, while the PBR favors C 2 H x . Within the suite of CSTR cases, C 2 H x  is favored at the lowest feed temperature and highest CH 4 /O 2  feed ratio.

Reactor engineering calculations with a detailed reaction mechanism for the oxidative coupling of methane