Abstract
Mesoporous γ-alumina adsorbents were synthesized from a low-grade boehmite ore, using the heat-treatment/acid-leaching (TC) and vice-versa (CT), under 400–600℃, 2–6 M HCl and H2SO4 solutions. The crystallinity of active species, morphology, elemental mapping, specific surface area, gravimetric phase changes, and chemical composition of the samples were characterized. The 0.50–1.00 mm γ-alumina prepared through heating, and followed by acid leaching with HCl (TC sample) presented mesoporous structure with the highest specific surface area of 245.802m2/g, pore volume 0.32773cm3/g, and average pore diameter of 44.3420A0. Using both CT and TC adsorbents, along with a commercial adsorbent, for the regeneration of used transformer oil, the TC adsorbent demonstrated the best performance, resulting in improved oil properties such as viscosity, interfacial tension, total acid number, dielectric dissipation factor, resistivity, and moisture content. Furthermore, the TC adsorbent was affected less by surface attrition and producing fine debris during recovery of oil compared to the commercial one.
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