A new preparation method of Cu from CuO under hydrothermal conditions was investigated. Glucose was employed as reducing agent. Results showed that CuO can be reduced easily to Cu°with glucose as reductant at 220-250°C with NaOH. The reaction conditions such as reaction time, reaction temperature, sodium hydroxide concentration and water filling played key roles in the purity of the products. The proposed method provides an efficient and green conversion of CuO into Cu°without an expensive and toxic reducing agent at low temperatures.
Possible catalytic activity of different metals in hydrothermal reduction of CO2 into formic acid with Zn was investigated under low temperatures. Among the several catalysts (Cu, Fe and Sn) were used, Cu shows the best catalytic activity for the formic acid production. The formic acid yield is as high as 61% under hydrothermal condition. XRD analysis was also carried out to investigate the possible role of reactants.
A new and green technology for converting microalgae to high value-added chemicals with solid metal oxides catalysts under hydrothermal conditions was proposed. The results indicated that ZrO2, among other test catalysts, can prominently boost the production of acetic acid and a highest yield of 24% was achieved at 300 °C for 2 h with a filling rate of 50%. The metal oxides catalyst provided a promising solution to obtain acetic acid from microalgae conversion.
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