Abstract
The continuous carbon dioxide, CO2 emission into the atmosphere has caused climate change and other environmental issues. As a part of the effort towards a sustainable future, hydrogenation of CO2 into methane is seen as a useful method to recycle CO2. This Sabatier reaction can be conducted by reacting hydrogen gas, H2 with CO2 under the presence of a Ni-based catalyst which can be enhanced under the presence of support and a second metal. In this work, a nickel-based catalyst supported by reduced graphene oxide nanosheets was synthesized and the influence of the addition of the second metal was studied. Ni/rGO, Ni-Co/rGO, and Ni-Cu/rGO were synthesized using the incipient wetness impregnation method and characterized using X-ray diffraction (XRD), Surface Area and Porosity Analysis (SAP) and H2 temperature-programmed reduction (H2-TPR). The purpose of adding second metals is to determine the effect on their physicochemical properties such as crystallinity, surface area, dispersion, and reducibility of catalyst for hydrogenation of CO2. Fixed loading of the metal was used with 15 wt.% nickel (Ni) catalyst and 5 wt.% second metals (M = Co and Cu). Based on the correlation result studies, adding the second metal shows good physicochemical properties which enhance reducibility and reduce surface area compared to other synthesized catalysts which indicates that it has a strong catalytic activity in methanation. Ni-Cu/rGO recorded the lowest reduction temperature which reflects the highest reducibility due to the smaller crystallite size, lower surface area, and higher dispersion which was suggested by XRD and SAP results.
Published Version
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