Investigation of Cu promotion effect on hydrotalcite-based nickel catalyst for CO2 methanation

The present research focuses on a Ni-Mg-Al hydrotalcite-derived catalyst promoted with Cu. Catalysts were prepared by the co-precipitation method at constant pH and subsequently characterized via XRD, H2-TPR, CO2-TPD, TGA, XAS, TEM, low-temperature nitrogen sorption tested for CO2 hydrogenation to methane. methanation reaction was carried out GHSV of 12,000 ml?g-1 h-1 high selectivity (above 98%) activity in conversion (up 86%) observed 350? HTNi15Cu1 sample containing 1.3 wt% influence Cu promotion especially visible low temperatures (250-300?) where significant is when compared non-promoted sample. highest copper content less selective methane formation but reverse water-gas shift reaction. Also, its worst examined series, indicating that concentrations are not suited methanation. It likewise an increase content, Ni-Cu solid solution formed. Later, during reaction, alloy undergoes redispersion due atomic erosion effect, forming well-dispersed nickel nano-crystallites.