A study of deactivation by H₂S and regeneration of a Ni catalyst supported on Al₂O₃, during methanation of CO₂. Effect of the promoters Co, Cr, Fe and Mo

Abstract

Energy storage from renewable sources is possible by chemical procedures, power to gas technology being a possible solution for long-term storage.

Electrochemical carbon dioxide capture to close the carbon cycle

“…Production of synthetic hydrocarbon fuels and chemicals often requires high purity CO 2 feeds. Many CO 2 capture facilities using centralized sources simultaneously capture sulfur containing compounds, such as hydrogen sulfide (H 2 S) that must be removed upstream to avoid catalyst poisoning [340]. The process of desulfurization typically involves liquid phase oxidation to promote H 2 S oxidation to sulfur, followed by sulfur separation from the gas stream [341].…”

Container-Sized CO2 to Methane: Design, Construction and Catalytic Tests Using Raw Biogas to Biomethane

“…The catalyst reduction, carbon deposition on the catalyst surface leading to pore blockage, and crystalline phase transition leading to metal and support sintering are mainly responsible for the loss in the surface area [41][42][43]. In our case, XRD shows phase transition and increase in crystalline size due to the Ni 3 S 2 phase, and this could be the reason for the loss in the surface area as the Ni 3 S 2 phase can accelerate the particle sintering and loss of surface area [44][45][46]. However, no significant catalytic activity loss was observed during the catalytic reaction, which shows that carbon species blocked no active species.…”

Effect of the Addition of Alkaline Earth and Lanthanide Metals for the Modification of the Alumina Support in Ni and Ru Catalysts in CO2 Methanation

“…To that end, alkaline earth metals (Ba, Ca, and Mg) and lanthanides (La and Ce) were added to the bare support and their effect in catalyst containing Ru, Ni, and Ni-Ru as active metal on the CO 2 methanation reaction was examined. The Ni content used as promoter was 13 wt%, and that of Ru 1 wt%, based on previous studies already done by the research group, i.e., [37]. In the case of Ba, Ca, and Mg, it was 10 wt%, and in that of La and Ce, 14 wt%, justified by the above studies available in the bibliography.…”

“…Then, the catalysts were reactivated by reduction with H 2 . The recovered catalyst was used in a reaction stage, at 773 K. The catalyst activity was observed as methane yield was not recovered [37,74]. During the reaction or deactivation stage, CO could have appeared as a by-product of the reverse water gas shift reaction, but it could also appear by the partial oxidation of the coke in the regeneration.…”