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The results show that the variation of the Mn element incorporated with LaNiO 3-δ solid affected 5-HMF conversion and the intermediate distribution. Besides, crucial operating parameters, i.e., temperature (80–120 ☌), pressure (1–5 bar), base addition (0–6 mmol), and time (2–24 h), were studied to predict the optimal reaction conditions. The 5-HMF oxidation reaction was performed in TBHP oxidant and acetonitrile solvent. In addition, comprehensive characterizations such as SEM–EDX, XRD, and XPS were used to study catalyst properties, especially oxygen surface sites. The catalysts were synthesized by the sol–gel method. Hence, the research aims to study the effect of the Mn element partially replacing Ni-cation in the LaNiO 3 structure, so-called double perovskite oxide with LaMn xNi 1-xO 3-δ (0 ≤ x ≤ 1). The benefit of different B-cation incorporation is to induce the reactive oxygen sites - it plays an essential role in catalysis. This research presents the Mn partial substitution in perovskite oxide LaNiO 3 to provoke its catalytic activities for the 5-hydroxymethylfurfural (5-HMF) oxidation - a chemical transformation producing higher-value products.
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