A short review on the promotional effects of ceria-based catalyst for dry reforming methane

Abstract

Dry reforming of methane (DRM) appears as a promising process for the industrial production of syngas in comparison to other conventional reforming technologies. However, DRM process suffers from catalyst deactivation induced by carbonaceous species which reduces the catalyst lifespan. Currently, catalytic designs in DRM have trended towards the incorporation rare-earth metals. As such, ceria (Ce) based catalyst has recently attracted research interest for its key feature to mitigate catalyst deactivation owing to its complementary redox and oxygen storage properties for the removal of surface carbon deposit. The present short review summarizes on the recent catalytic performance of Ce-based catalyst and impact of ceria redox on the DRM mechanism. The utilization of oxygen vacancies introduced by the Ce redox support enhances the catalytic activity by providing additional bifunctional sites and intermediate species to facilitate the surface reaction rate. This perspective will elucidate the role of oxygen vacancies in Ce supports and fine tune the catalytic performance of DRM for industrial applications.

CO2 Reforming of Ethanol over Ni/Al2O3-(Zr–Yb)O2 Catalysts: The Effect of Zr:Al Ratio on Nickel Activity and Carbon Formation

“…73 Carbides are generally considered to be a form of carbon that produced in EDR reaction and, then, oxidized. 74 Furthermore, for Ni/65AZ, this ratio was higher in the low-temperature EDR and in the longterm experiment, which also correlates with the high carbide content of this sample.…”

“…The low acidity of Ni/35AZ led to an insufficient amount of adsorbed CO on the catalyst surface that could go through water–gas shift reaction. , According to XPS data on the surface of our samples predominantly carbide formation is observed (Figure ), which correlates with insufficient oxidation of surface carbon and H 2 /CO ratio greater than 1 . Carbides are generally considered to be a form of carbon that produced in EDR reaction and, then, oxidized . Furthermore, for Ni/65AZ, this ratio was higher in the low-temperature EDR and in the long-term experiment, which also correlates with the high carbide content of this sample.…”

Pretreatment Methods of Microalgae Biomass for Biogas Production

“…However, under reducing conditions, specifically in a H 2 -rich atmosphere, oxygen is liberated from the CeO 2 lattice, leading to the formation of oxygen vacancies and the generation of Ce 3+ . The redox property results in high oxygen mobility to CeO 2 via a redox cycle between Ce 4+ /Ce 3+ under the Mars-van Krevelen mechanism (Liew;Jalil;Tan, 2022).…”

La2O3-CeO2-Supported Bimetallic Cu-Ni DRM Catalysts

“…[3,4,10,11], supports with a high concentration of oxygen vacancies or highly basic properties were proposed. In terms of these properties, the relatively accessible highly basic La 2 O 3 [12] and CeO 2 (which features high oxygen mobility [4,13,14]) are of interest, also demonstrating a strong metal-support interaction in the composition of nickel catalysts [4,15,16]. Despite the fact that both oxides are being actively studied as supports [3,5,14,[16][17][18], there are few publications on La 2 O 3 -CeO 2 binary systems.…”

“…It is believed that the suppression of carbon deposition occurs through the formation of intermediate reactive products during the CO 2 adsorption on the supports and their subsequent oxidation ability towards the conversion of highly active forms of carbon on the Ni particles. Dissociative adsorption occurs on CeO 2 with the participation of surface oxygen vacancies (labeled as VOs) and Ce 3+ cations [10,15,16,[19][20][21][22][23][24][25]:…”