Abstract
Traditional calcium hydroxide (Ca(OH)(2)) typically exhibits low specific surface area and reactivity, significantly limiting its efficacy in industrial gas-solid reactions such as flue gas desulfurization and thermochemical energy storage. To address these limitations, this study proposes a two-stage synthesis strategy designed to enhance the surface properties and chemical activity of Ca(OH)(2). The process involves the preparation of high-activity calcium oxide (CaO), followed by controlled hydration using diethylene glycol (DEG). Drawing on established mechanisms from cement chemistry, wherein potassium ions (K(+)) catalyze the decomposition of calcium carbonate (CaCO(3)), limestone particles (10-20 mm) were pre-soaked in a 0.1 mol/L potassium nitrate (KNO(3)) solution for 48 h prior to calcination. Characterization via X-ray diffraction (XRD), scanning electron microscopy (SEM), and Blaine Air Permeability Method analysis revealed that this pretreatment accelerated decomposition kinetics by inducing surface defects, yielding CaO with a maximum reactivity of 435.7 mL. Subsequent hydration at 80 °C with 70 wt% DEG effectively suppressed particle agglomeration and promoted the formation of thin platelet structures. The resulting Ca(OH)(2) achieved a utilization efficiency of 98.5% and a specific surface area of 43.24 m(2)/g, demonstrating a robust technical route for fabricating high-performance calcium-based sorbents for environmental and energy applications.