Cyclic redox scheme towards shale gas reforming: a review and perspectives

Fan, Liang‐Shih; Cheng, Zhuo; Baser, Deven S.; Goldenbaum, Tyler; Fan, Jonathan A.

doi:10.1039/d0re00301h

Cited by 18 publications

(7 citation statements)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxidative coupling of methane (OCM) is a chemical process that converts methane to higher hydrocarbons such as ethylene and propylene. , It simplifies the cumbersome process involved in the indirect conversion of methane. Gaseous oxygen, as a strong oxidant in the OCM reaction, tends to overoxidize methane to COx, which will reduce the selectivity of the target product. , In addition, the mixing of oxygen and methane poses a safety risk of explosion . An air separation device must be provided at the end of a reactor to separate unreacted gaseous oxygen.…”

Section: Introductionmentioning

confidence: 99%

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Zeng,

Liu,

Wang

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Plasma-assisted chemical looping oxidative coupling of methane is a potential route for the conversion of methane into value-added C2+ hydrocarbons under mild conditions. However, the low C2+ selectivity of traditional oxygen carriers limits further development. In this study, we report a series of kalium-doped LaMnO3 oxygen carriers. The optimal doping level of kalium is found to be 1.0%, resulting in a C2+ selectivity of 92.67% at 400 °C, and the performance remained stable after 20 redox cycles. Mechanistic studies show that 1.0% kalium doping inhibits the migration of lattice oxygen (O2 2–) from bulk to the surface and the subsequent evolution of surface oxygen from electrophilic species (O–) to nucleophilic species (O2–). Therefore, the nucleophilic oxygen species (O2–) responsible for the overoxidation of the products was limited and in turn achieved a higher C2+ selectivity.

show abstract

Section: Introductionmentioning

confidence: 99%

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Zeng,

Liu,

Wang

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Thus, it is necessary to solve problems by optimizing the conditions and options of catalysts with high activity, selectivity, and stability. The applied metals, effects of size, promoter, and support, as well as coordination state and acidic/basic properties of these catalysts were studied and summarized in recent works. − However, the clarification and summation of the latest developments on the active component of the catalyst are reflected in this review.…”

Section: Introductionmentioning

confidence: 99%

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

Zagaynov

2021

Energy Fuels

View full text Add to dashboard Cite

Methane transformation into more valuable products has attracted extensive attention. Synthesis gas is an important intermediate product in the chemical industry. Several syngas production methods are available, depending on the purpose of the industrial application. A major limitation of the processes is the rapid deactivation of the catalyst, which has been commonly attributed to the sintering of the active sites of catalyst and carbon formations on these sites, induced by methane decomposition and CO disproportionation. The catalyst consists of an active component and support. Ceria-based systems have been extensively employed as the support because of their unique redox properties and high oxygen storage capacity. The most promising approach is to design an excellent active site of the catalyst, based on noble or transition metals. A comparison of perspective active components, especially polymetallic components, is considered here.

show abstract

“…Comparison of CLOCM systems on a C 2+ selectivity vs CH 4 conversion plot from the literature and this work. ,,,,− …”

Section: Introductionmentioning

confidence: 99%

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System

Baser

Cheng

Fan

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Oxidative coupling of methane (OCM) is a compelling strategy for the direct conversion of methane to C2+ hydrocarbons in order to produce fuels and value-added chemicals. Nevertheless, it remains challenging to achieve the high C2+ yield that is desirable in industrial synthesis. Here, a lithium, tungsten-codoped Mg-Mn based oxygen carrier, (Li,W)-Mg6MnO8, is prepared for the chemical looping oxidative coupling of methane (CLOCM) technology. The designed codoped oxygen carrier exhibits an improved OCM performance with a C2+ yield of 28.6% at 850 °C, which is 80% higher than the combined yields of the single Li- and W-doped oxygen carriers, and 330% higher than that of the undoped Mg6MnO8 oxygen carrier. The enhanced activity has also been demonstrated over 50 redox cycles in the CLOCM system. In combination with solid characterization, density functional theory calculations reveal that, as compared to the single-metal-doped Mg6MnO8, the Li and W codopants work synergistically which not only enhances CH3 dimerization but also inhibits CO2 formation. This effect was attributed to the suppressed formation of unselective oxygen vacancies, which in turn leads to the C2+ yield enhancement. As a result, (Li,W)-Mg6MnO8 was found to be one of the best performing oxygen carriers as compared to other oxygen carriers reported in the literature. These findings provide new insights into the understanding of the codoping effect on the activity of a Mg-Mn based oxygen carrier for C2+ production and can open new avenues to design an environmentally and economically feasible CLOCM system.

show abstract

Cyclic redox scheme towards shale gas reforming: a review and perspectives

Abstract: Alkanes are potential precursors to many value-added chemicals such as olefins and other petrochemicals. However, the conversion of the light alkanes can be challenging due to their strong C-H bonds....

Cited by 18 publications

References 119 publications

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System

Contact Info

Product

Resources

About

Cyclic redox scheme towards shale gas reforming: a review and perspectives

Abstract: Alkanes are potential precursors to many value-added chemicals such as olefins and other petrochemicals. However, the conversion of the light alkanes can be challenging due to their strong C-H bonds....

Cited by 18 publications

References 119 publications

Over 90% C2+ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C2+ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C2 Yield in a Chemical Looping Oxidative Coupling of Methane System

Contact Info

Product

Resources

About

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Over 90% C₂₊ Selectivity in Kalium-Doped Manganese Perovskite Oxygen Carriers for Chemical Looping Oxidative Coupling of Methane with Plasma Assistance

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System