Abstract
AbstractWe investigated the changes in activated carbon (AC) physicochemical properties during treatment with supercritical water (SCW). Experimental results show that SCW treatment can increase the specific surface area and pore volume of AC. Scanning electron microscopy proves that the AC surface undergoes severe corrosion, resulting in the exposure of highly porous structures. In addition, the point‐of‐zero charge of AC increases after SCW treatment without the addition of HCl, H2SO4, and H2O2. This result is confirmed by the presence of C≡C and −OH functional moieties, as established through Fourier transform infrared spectroscopy. Temperature programmed desorption profiles suggest that the decomposition of AC in the SCW treatment produces pyrone and anhydride functional groups. According to the above results, SCW treatment increases the adsorption capacities of AC. In SCW catalytic processes, therefore, active components removed from the surface of AC‐supported catalysts are directly involved in reactions that enhance the catalytic activity.
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