Adsorption of NaCl vapor at elevated temperature on mineral adsorbents

Some mineral adsorbents were selected to remove NaCl vapor at elevated temperature. Results indicate that the activated alumina is the best adsorbent with the highest sodium compound content, under conditions of 1123 K, a gas velocity of 16 L/min, an adsorption time of 5 h, and a NaCl concentration of 0.13 mg/L. Results show that sodium compound content is dependent on the microporous structure and the chemical constitutes of the adsorbent, but the extent of the effects varies with each adsorbent. Results of XRD and SEM indicate that physical adsorption exists in the NaCl vapor-capture mechanism of the activated alumina. Its kinetics results indicate that both chemical adsorption and physical adsorption exist, and the adsorption process of the activated alumina is controlled by both the chemical adsorption control and the product-layer-diffusion control of physical adsorption.