Interfacial Ni active sites strike solid solutional counterpart in CO2 hydrogenation

Ni enhanced CeO2 based catalysts were tested in CO2 hydrogenation reaction with the objective to investigate importance and role of Ni0 Ni0-NiO-CeO2−x interfaces. Two materials prepared: a 4 mol% NiO/CeO2 interfacial oxide where supports NiO nanoparticles was produced by wet impregnation method Ce0.96Ni0.04O2 mixed obtained co-precipitation Ce3+ Ni2+ ions. Besides these materials, pure also synthesized tested, serving as reference materials. HRTEM, TPR, XRD, BET, EDS, Raman spectroscopy, XPS used for characterization catalysts. The activity selectivity strongly depended on metallic content, which is tunable temperature hydrogen pretreatment. impregnated catalyst significant content exhibited high methane selectivity. more resistant reduction, case both Ce4+ species, thus it has low CO increased considerably increasing metal or higher pretreatment temperature. Operando DRIFTS experiments suggested that bicarbonate formate intermediates play important types reduced particles help produce amount needed methane. It turned out not only catalyzes production from but bicarbonate-formate transformation. most factor performance Ni0/NiO ratio interface.