Bimetallic-Derived Catalysts and Their Application in Simultaneous Upgrading of CO2 and Ethane

Bimetallic Exsolved Heterostructures of Controlled Composition with Tunable Catalytic Properties

“…The concept of carbon capture and utilization (CCU) has been receiving increasing attention as a strategy to decrease greenhouse gas emissions. , Among different CCU routes, the CO 2 -assisted dehydrogenation of alkanes has been shown to be a promising method for using CO 2 as a mild oxidant toward the synthesis of useful chemicals, such as alkenes . The reaction of CO 2 -assisted oxidative dehydrogenation of ethane (CO 2 -ODH, eq ) attempts to utilize both CO 2 captured from point and mobile sources as well as underutilized ethane that can be found in large quantities in shale gas reserves, to produce ethene, which constitutes an important chemical feedstock in the petrochemical industry. , One main competitive reaction to CO 2 -ODH is dry ethane reforming (DER, eq ). Using the same reactants, synthesis gas (i.e., H 2 and CO mixture) is generated. , …”

“…The reaction of CO 2 -assisted oxidative dehydrogenation of ethane (CO 2 -ODH, eq ) attempts to utilize both CO 2 captured from point and mobile sources as well as underutilized ethane that can be found in large quantities in shale gas reserves, to produce ethene, which constitutes an important chemical feedstock in the petrochemical industry. , One main competitive reaction to CO 2 -ODH is dry ethane reforming (DER, eq ). Using the same reactants, synthesis gas (i.e., H 2 and CO mixture) is generated. , …”

“…Fe-based catalysts have attracted interest, as Fe is among the cheapest transition metals and also exhibits a redox cycle (Fe 2+ ⇔ Fe 3+ ⇔ Fe 4+ ). − Moreover, the performance of Fe-based catalysts can be improved by the introduction of a second metal, such as Ni. Literature reports show that Fe–Ni bimetallic catalysts enable higher conversions of C 2 H 6 and CO 2 , mainly due to favorable synergistic effects between the two metals. ,− Yan et al showed that the selectivity for the reforming and dehydrogenation pathway could be varied by tuning the Ni/Fe ratio in the catalysts . With respect to the standard, solution-based synthesis of bimetallic catalysts, the recently discovered exsolution approach represents a modern and attractive preparation method because it leads to highly stable, regenerative catalysts .…”

Catalytic Tandem CO2–Ethane Reactions and Hydroformylation for C3 Oxygenate Production

“…The global climate crisis, , linked with the increasing CO 2 atmospheric concentration, has motivated the mitigation of anthropogenic emissions such as via catalytic conversion. − Recently, an emerging strategy of simultaneously upgrading CO 2 and the underutilized C2+ alkanes in shale gas has received attention. , These reactions can produce four types of important industrial building blocks, including the gaseous (syngas and olefins − ) and liquid (oxygenates and aromatics) products. The C3 oxygenates (propanal and 1-propanol) can be achieved via a tandem-reaction strategy, i.e., the concurrent dehydrogenation and reforming reactions producing a mixture of C 2 H 4 /CO/H 2 (first reactor) for a downstream heterogeneous hydroformylation reaction to produce C3 oxygenates (second reactor).…”

Catalytic Light Alkanes Conversion through Anaerobic Ammodehydrogenation

“…The key challenge for light alkane conversion under anaerobic conditions is the activation of inert C–H bonds at low temperatures and avoid the ubiquitous coke deposition at high temperatures. To mitigate these challenges, H 2 , H 2 O (g), and CO 2 have been frequently employed as auxiliary reactants during dehydrogenation − and aromatization. , However, the use of H 2 as an auxiliary gas will decrease the equilibrium conversion of dehydrogenation and aromatization, and the presence of H 2 O (g) and CO 2 (presence of CO 2 could result in H 2 O (g) formation) has the potential risk of de-alumination of zeolites at high temperatures …”