Supported Ga-oxide Catalyst for Dehydrogenation of Ethane

Abstract

We studied dehydrogenation catalysts to improve the performance of the ethane cracking tube. Ga, Ge, In, and Sn were studied as dehydrogenation catalysts. Catalytic activity tests showed that the Ga catalyst has the best performance among them. Although the Ga catalyst supported on α-Al2O3 calcined at 1323 K deactivated with time on stream, the Ga catalyst supported on γ-Al2O3 calcined at 1323 K showed high ethylene yield and stability. Analyses of BET, XRD, EDX, and XANES were conducted to elucidate the differences of their performances. Ga catalyst supported on γ-Al2O3 calcined at 1323 K showed high catalytic activity and stability because Ga was supported as a highly dispersed β-Ga2O3-like structure thanks to high specific surface area of the γ-Al2O3 support.

Liquid Metals in Catalysis for Energy Applications

“…Fixed-bed reactors are versatile conventional designs that have been extensively used in many energy-related LM catalytic applications. 47,[85][86][87][88] Fixed-bed reactors provide high single pass conversion per unit of catalyst mass; however, they exhibit nonuniform temperature distribution and unfavorable heat transfer. Moreover, microchannel reactors are utilized in methanol steam reforming.…”

High-loading Ga-exchanged MFI zeolites as selective and coke-resistant catalysts for nonoxidative ethane dehydrogenation

“…Various types of Ga species, including those reduced (Ga + cations and isolated Ga hydrides) and those oxidized (Ga oxides, [GaO] + , and [Ga(OH) 2 ] + ), are possibly formed and proposed as active sites for the dehydrogenation of light alkanes, and several reaction mechanisms are proposed. 33–38 Alkane dehydrogenation on Ga oxides has been explored regardless of differences in structures and supports; 39–46 however, Ga-oxide-based catalysts often suffer from quick deactivation. Under reductive conditions without any oxidant, Ga hydrides are considered to be more active sites than Ga + cations.…”

Co–CeO2 Interaction Induces the Mars–van Krevelen Mechanism in Dehydrogenation of Ethane

“…From a practical perspective, we have proposed introduction of an EDH catalyst to steam cracking processes. − In this case, the catalyst is readily applicable to the process by coating catalysts on the cracking coil internal wall. In our latest study, Ba-doped LaMnO 3 perovskite oxide exhibited high catalytic activity for ethane dehydrogenation with steam ( pseudo -steam cracking conditions) at 973 K. , Based on various experiments and density functional theory calculations, the reaction proceeds via the Mars–van Krevelen (MvK mechanism, as shown below. …”