Alternative Oxidants for the Catalytic Oxidative Coupling of Methane.

The catalytic oxidative coupling of methane (OCM) to C hydrocarbons with oxygen (O -OCM) has garnered renewed worldwide interest in the past decade due to the emergence of enormous new shale gas resources. However, the C selectivity of typical OCM processes is significantly challenged by overoxidation to CO products. Other gaseous reagents such as N O, CO , and S have been investigated to a far lesser extent as alternative, milder oxidants to replace O . Although several authoritative review articles have summarized OCM research progress in depth, recent oxidative coupling developments using alternative oxidants (X-OCM) have not been overviewed in detail. In this perspective, we review and analyze OCM research results reporting the implementation of N O, CO , S , and other non-O oxidants, highlighting the unique chemistries of these systems and their advantages/challenges compared to O -OCM. Current outlook and potential areas for future study are also discussed.