Effect of Nickel Doped Titanium Dioxide Catalyst on Methanol Synthesis From Carbon Dioxide Via Photochemical Reaction Under Ultraviolet Irradiation
Keywords:
Transition metal, Photocatalytic reduction, Green house gas, Sol-gel, CarbondioxideAbstract
Photocatalytic reduction of carbon dioxide into methanol fuel has been investigated by using the Ni-doped TiO2 photocatalyst. The experiment was carried out under a 50 ml batch reactor in the liquid phase and UV irradiation. Ni/TiO2 photocatalysts were prepared by a sol-gel method. The Characterization of photocatalysts was analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance (UV-Dr), and scanning electron microscope (SEM). Moreover, the effect of reaction time and Ni loading on the methanol conversion were studied. It was found that the methanol concentration decreased with increasing reaction time due to the degradation of methanol. The Ni loading exhibited the higher methanol than undoped TiO2 because Ni could trap the electron during irradiation and reduce electron-hole pair recombination by the p-n junction of TiO2. However, the increased of Ni loading affected to methanol decreased due to the face that the surface reduction. The highest methanol production rate at 384 μmol gcat.-1 was obtained over 1% wt — Ni/TiO2 catalyst for 2 hours, which is 15 times higher methanol production than that over the P25 commercial catalyst. Therefore, 1% wt. Ni/TiO2 showed better potential and activity in reducing CO2 emission to the environment.
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