Deep Understanding into the Effect of Fe on CO₂ Methanation: A Support-Dependent Phenomenon

Abstract

An in-depth understanding of the influence mechanism of the nonprecious metal Fe promoter on CO2 methanation is of great significance to the optimal design of high-efficiency CO2 methanation catalysts. In this research, CeO2 and Al2O3-supported Ni-based catalysts were prepared and evaluated for the CO2 methanation reaction. Interestingly, it was found that the addition of Fe into the CeO2-supported Ni catalyst lowered the CO2 methanation performance, while it greatly enhanced the performance of the Al2O3-supported Ni catalyst. A variety of factors over Fe-modified catalysts were explored, in which surface basicity along with oxygen vacancies could contribute to the adjustment of the CO2 methanation performance.

Methane Production over Electrospun Cobalt-Lanthanide Oxide Catalysts

“…However, due to the exothermic nature of the reaction, this effect has a limit, from which the secondary reactions such as the reverse water–gas shift reaction became preponderant, leading to a reduction in selectivity toward methane. It can also be noted that none of the catalysts reached thermodynamic equilibrium until 450 °C; they were all far below the thermodynamics equilibrium level, indicating that their catalytic performances were not limited by thermodynamics . Moreover, the catalysts obtained by IWI are generally more active and selective than those obtained by ES and those with the highest amount of cobalt are the most active.…”

“…It can also be noted that none of the catalysts reached thermodynamic equilibrium until 450 °C; they were all far below the thermodynamics equilibrium level, indicating that their catalytic performances were not limited by thermodynamics. 57 Moreover, the catalysts obtained by IWI are generally more active and selective than those obtained by ES and those with the highest amount of cobalt are the most active. The unusual behavior of the lanthanum compounds prepared by IWI correlates with the modifications observed by XRD in the lanthanum oxide phase (perovskite versus sesquioxide) after reaction and after H 2 -TPR studies, which seem to occur at 375 °C.…”

Single‐Atom Ru Alloyed with Ni Nanoparticles Boosts CO2 Methanation

“…In recent years, intensive research has been carried out on the monometallic catalysts for CO 2 methanation, including platinum group metals (e.g., Pt, [ 3 ] Pd, [ 4 ] Ru, [ 5 ] etc.) and non‐precious metals (e.g., Fe, [ 6 ] Co, [ 7 ] Ni, [ 8 ] etc.). However, there are still some problems with monometallic catalysts, such as single active sites that lack multiple catalytic functions or enough flexibility for tuning catalytic performances and poor activation and dissociation performance of CO 2 .…”

Preface for Special Issue on Engineered Methodologies for CO2 Utilization

“…Focusing now on CO 2 transformation using green hydrogen, Tsubaki et al reported the direct conversion of CO 2 to aromatics using a bifunctional zeolite-based catalyst, Herskovitz et al. investigated the process configuration and technoeconomic aspect of CO 2 hydrogenation to renewable liquid fuels, Fan et al reported the conversion of CO 2 to light olefins using metal oxides, Pieta et al discussed the conversion of CO 2 to CO and methane using non-noble-metal-supported catalysts, Wang et al reported the conversion of CO 2 to methanol using a modified Cu/ZnO/Al 2 O 3 catalyst, Ma et al provided a short review on the formation of methanol from CO 2 by direct and indirect hydrogenation pathways, Gonzalez-Velasco et al investigated kinetics, model discrimination, and parameters of CO 2 methanation, Ding et al and Benito et al studied the mechanism of CO 2 methanation and promoter effect on the catalyst performance. For the transformation of CO 2 using chemicals other than green hydrogen, Ateka et al reported the joint conversion of CO 2 with syngas to synthesize light olefins, Liang et al and Sun et al prepared nickel-based catalysts for CO 2 reforming of methane, Jin et al investigated carbon fixation via the gasification of polypropylene and polycarbonate in a CO 2 environment, Song et al revealed mechanistic insights into the promotional effect of CO 2 on propane aromatization, and Liu et al reported enhanced CO 2 decomposition via frosted dielectric barrier discharge plasma .…”