Here we show that petroleum can be formed efficiently at normal temperatures and pressures from carbon dioxide and activated water. The oxygen nano-bubble containing water was treated with TiO₂ catalysis under UV irradiation. The activated water was mixed vigorously with kerosene or light oil and carbon dioxide to form an emulsion. The emulsion gradually separated into a two-phase solution. After phase separation, the volume of kerosene or light oil, depending on which oil was utilized, increased by 5 to 10 %.

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