Synthesis of zeolite X from oil well drill cuttings for CO2 capture
Palavras-chave:
Sustainability, drill cuttings, CO2 capture, zeolite XResumo
One of the most abundant waste products from the natural gas and oil exploration process is drill cuttings. In this work, drill cuttings were studied as a sustainable raw material for synthesizing zeolite X, an excellent adsorbent used to capture CO2. Elemental analysis of the cuttings sample by X-ray Fluorescence revealed a material rich in SiO₂ (52.91%) and Al₂O₃ (17.95%). The synthesis process was carried out in three steps: (i) hydrothermal treatment of the cuttings in 8 mol.L-1 NaOH at 200°C for 20 h, yielding hydroxycancrinite (CAN); (ii) solubilization of hydroxycancrinite with 37% HCl and recycling of the alkaline liquid obtained in step “i” to adjust the pH to 14; and (3) hydrothermal crystallization at 100°C for 44 h. The material obtained at the end of the process presented faujasite topology (FAU) with a high BET surface area (632 m2.g-1) and a CO2 capture capacity of 12.6% (2.864 mmol.g-1). These results indicate that this is a sustainable route for using this residue from the oil industry to mitigate CO2 emissions.
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