Adsorptive removal of siloxanes from biogas: recent advances in catalyst reusability and water content effect

Abstract The valorization of biogas as a renewable energy source faces major obstacle regarding its purification. Siloxane is one the impurities that cause problems such damages to equipment combustion engines, turbines, and boilers used for conversion heat electricity. In this review, adsorption siloxane removal widely discussed, with two specific approaches: adsorbents sensitivity water regeneration, essential points industrial application. Thus, determining factors in capacity, reusability, tolerance including textural properties, surface functional groups, hydrophobicity are deeply analyzed. Studies oriented optimization traditional activated carbon, silica gel, aluminosilicates well newly emerging metal organic frameworks, graphene oxides, waste-derived materials studied detail terms reusability tolerance. Although carbon commercially used, low selectivity, pore blockage due polymerization, unsuccessful regeneration make it disadvantageous. Silica however, shows better result less adsorbent-adsorbate dissociation energy. addition, aluminosilicates, despite proved be more practical real their high hydrophobicity. Graphene oxide cost efficiency synthesis them industrially appealing candidates capacity. Finally, frameworks demonstrated efficient therefore have advantages drawbacks, although number published studies still limited.