@Article{ee.2022.015504,
AUTHOR = {Aijia Zhang, Yingju Yang, Jing Liu, Junyan Ding},
TITLE = {HCl-Induced Hg<sup>0</sup> Transformation over CuMn<sub>2</sub>O<sub>4</sub> Sorbent},
JOURNAL = {Energy Engineering},
VOLUME = {119},
YEAR = {2022},
NUMBER = {2},
PAGES = {499--510},
URL = {http://www.techscience.com/energy/v119n2/46644},
ISSN = {1546-0118},
ABSTRACT = {CuMn<sub>2</sub>O<sub>4</sub> spinel has been regarded as a highly efficient sorbent for Hg<sup>0</sup> capture from flue gas. The regenerability and recyclability of CuMn<sub>2</sub>O<sub>4</sub> sorbent are mainly associated with the mercury speciation adsorbed on its surface. However, the effect mechanism of HCl on Hg<sup>0</sup> transformation over CuMn<sub>2</sub>O<sub>4</sub> sorbent is still elusive. Experiments were conducted to understand the effect of HCl on Hg<sup>0</sup> transformation over CuMn<sub>2</sub>O<sub>4</sub> sorbent. The results indicate that CuMn<sub>2</sub>O<sub>4</sub> sorbent is a mesoporous material and possesses a good thermal stability. CuMn<sub>2</sub>O<sub>4</sub> shows >95% Hg<sup>0</sup> removal efficiency in a wide temperature window of 50–350°C. The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg<sup>0</sup> removal performance of CuMn<sub>2</sub>O<sub>4</sub> sorbent. CuMn<sub>2</sub>O<sub>4</sub> shows a higher Hg<sup>0</sup> adsorption capacity of 4774.57 μg/g. Hg<sup>0</sup> adsorption process over CuMn<sub>2</sub>O<sub>4</sub> sorbent can be well described by the developed kinetic model. Hg<sup>0</sup> removal efficiency of CuMn<sub>2</sub>O<sub>4</sub> sorbent does not depend on the presence of HCl. Mercury species adsorbed on the CuMn<sub>2</sub>O<sub>4</sub> sorbent in the presence of HCl mainly exist in the forms of HgO and HgCl<sub>2</sub>O<sub>8</sub> · H<sub>2</sub>O. HCl shows a significant effect on mercury speciation over CuMn<sub>2</sub>O<sub>4</sub> sorbent. Most of HgO species will be transformed into HgCl<sub>2</sub>O<sub>8</sub> · H<sub>2</sub>O in the presence of HCl.},
DOI = {10.32604/ee.2022.015504}
}