The influence of the reaction medium of oxidative methane coupling on the nature of bulk defects of the Li/CaO system

The catalytic oxidative coupling of methane (OCM) to C2 hydrocarbons with oxygen (O2‐OCM) has garnered renewed worldwide interest in the past decade due to the emergence of enormous new shale gas resources. However, the C2 selectivity of typical OCM processes is significantly challenged by overoxidation to COx products. Other gaseous reagents such as N2O, CO2, and S2 have been investigated to a far lesser extent as alternative, milder oxidants to replace O2. 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 N2O, CO2, S2, and other non‐O2 oxidants, highlighting the unique chemistries of these systems and their advantages/challenges compared to O2‐OCM. Current outlook and potential areas for future study are also discussed.

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“…increased significantly, providing evidence that O −. species are derived from N 2 O and lead to selective C 2 formation [23a, b] …”

Section: N2o As An Oxidant (N2o‐ocm)mentioning

confidence: 99%

Alternative Oxidants for the Catalytic Oxidative Coupling of Methane

2021

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“…58 Comparing the results of the OCM reaction using O 2 and N 2 O as oxidizing agents indirectly supports the importance of the nature of oxygen species. In [59][60][61][62][63]…”

Section: Oxygen Species In the Ocm Reactionmentioning

confidence: 99%

Chapter 3. Catalysis of Oxidative Methane Conversions

Kondratenko

Baerns

2011

Nanostructured Catalysts

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The catalytic conversion of methane to C 2 hydrocarbons, i.e. ethane and its consecutive product ethylene, as well as to methanol and formaldehyde is dealt with. The heterogeneous catalysts and the mechanisms of these reactions are described and discussed. For an advanced understanding of catalytic methane conversion, some emphasis is put on the similarities of enzymatic conversion of methane to methanol; this might contribute for an improved design of respective heterogeneous catalysts.

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“…O 2 as an oxidant unavoidably induces some gas‐phase radical reactions, which complicate the optimization of catalyst and cause the limitation in C 2 yield due to the unavoidable, consecutive oxidation of the produced hydrocarbons to CO and finally CO 2 . Replacing of oxygen with other oxidant is considered as a possible approach to prevent the sequential reaction of C 2 products in the gas phase . Carbon dioxide, which is a soft oxidant to provide extra carbon atom for the methane conversion, has been explored as an oxidant for CO 2 ‐OCM reaction .…”

Section: Introductionmentioning

confidence: 99%

“…32 Replacing of oxygen with other oxidant is considered as a possible approach to prevent the sequential reaction of C 2 products in the gas phase. [33][34][35] Carbon dioxide, which is a soft oxidant to provide extra carbon atom for the methane conversion, has been explored as an oxidant for CO 2 -OCM reaction. [36][37][38][39][40] Early in 1988, Aika et al found that oxidative coupling of CH 4 by O 2 is promoted by CO 2 as a reactant.…”

Section: Introductionmentioning

confidence: 99%

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

Cai

2019

Energy Science & Engineering

121

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Two typical processes have been developed for the conversion of methane and carbon dioxide to higher valuable products: dry reforming of methane (DRM) and CO2‐oxidative coupling of methane (CO2‐OCM). Numerous articles reviewed progresses in either DRM or CO2‐OCM, but no one covers both processes. In this review article, we systematically evaluated progresses in both DRM and CO2‐OCM processes for conversion of methane and CO2 to highly valuable products. Critical issues, which are carbon deposition and high energy cost for DRM and the contradiction between large activity and high selectivity for CO2‐OCM, were emphasized. Strategies to develop effective catalysts were evaluated, including the enhancement of metal‐support interactions, the introduction of promotors, the formation of solid solutions, and the construction of core‐shell structures. Plasma and photocatalysis were discussed as new promising technologies for DRM and CO2‐OCM.

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The influence of the reaction medium of oxidative methane coupling on the nature of bulk defects of the Li/CaO system

Cited by 16 publications

References 13 publications

Alternative Oxidants for the Catalytic Oxidative Coupling of Methane

Alternative Oxidants for the Catalytic Oxidative Coupling of Methane

Chapter 3. Catalysis of Oxidative Methane Conversions

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

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