Mechanochemical synthesis of ZnO.Al2O3 powders with various Zn/Al molar ratios and their applications in reverse water-gas shift reaction
2021
Sakhaei, Zeinab | Rezaei, Mehran
ZnO.Al₂O₃ powders with various Zn/Al molar ratios were prepared via a solid-state reaction using a mechanochemical synthesis method, and the selected powder with a ZnO/Al₂O₃ molar ratio of 1 was used as support for the preparation of 15% Ni/ZnO.Al₂O₃ catalyst. The activity of the prepared catalyst was studied in the reverse water-gas shift (RWGS) reaction. The synthesized samples were characterized by XRD, BET, TGA/DTA, TPR, FTIR, and SEM techniques. The results indicated that the prepared powders possessed mesoporous structure with pores having small diameters with crystallite sizes in the nanometer range (6.35–12.08 nm). The results showed that the increment in Zn/Al molar ratio reduced the BET area and the pure Al₂O₃ powder possessed the highest BET area (235.4 m² g⁻¹). The results also indicated that the rise of calcination temperature remarkably decreased the BET area. The prepared nickel-based catalyst also exhibited a high activity in RWGS reaction.
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