Author(s)

Dayi Qian^1,2, Yuebo Zheng¹, Peiliang Shi^2,3*, Wei Su², Zhensong Tong³, Baorui Liang⁴, Yan Wang²

¹Key Laboratory of Pollutant Chemistry and Environmental Treatment, School of Chemistry and Environmental Science, Yili Normal University, Yining, China.
²School of Energy Environmental Engineering, University of Science and Technology Beijing, Beijing, China.
³BGRIMM Technology Group, Beijing, China.
⁴Tianjin College, University of Science and Technology Beijing, Tianjin, China.

Research and development of efficient, economical and resource-based flue gas desulfurization technology has always been a hot spot in the field of air pollution control. Molecular sieve materials have been paid attention to by SO₂ adsorbent researchers due to their huge specific surface area. In this paper, 13X zeolite was modified with Cu(NO₃) ₂·3H₂O to obtain 13x-Xwt %CuO (calculated by the amount of CuO loaded). The adsorption time and capacity of SO₂ penetration sorbent and the isothermal curve of N₂ adsorption-desorption were studied. The results are as follows: 13X-3wt%CuO has the best adsorption effect, the penetration adsorption time is 110 min, the penetration adsorption capacity is 43.41 mg·g^-1, the saturation adsorption capacity is 49.27 mg·g^-1; The amount of CuO loading has a great influence on the adsorption effect of modified 13X molecular sieve on SO₂. SEM and BET characterization showed that CuO modification did not change the external morphology of 13X molecular sieve, changed the pore size, but did not block the original channel of the molecular sieve, before and after modification belong to the type I adsorption isothermal curve. The pore size distribution and type of molecular sieve, as well as the content and type of alkali metal cations jointly control the adsorption process of SO₂ by 13X-xwt %CuO. XPS characterization showed that Cu(NO₃) ₂ decomposed into CuO and Cu₂O during roasting at 450°C, CuO/Cu₂O ≈ 1.5. The R² values of the quasi-second-order kinetic models obtained from the 13X-Xwt %CuO particle diffusion kinetic models were all above 0.99, indicating that the quasi-second-order kinetic equations were more relevant. Particle diffusion dynamics model in fitting results show that the adsorption process can be divided into two stages, the first phase of surface adsorption and diffusion rate in the granules common control process, more accurate dynamics model of the secondary in the second phase particle diffusion rate control stage, mainly for the micropore adsorption or chemical adsorption, quasi level 2 dynamic model conformity of variation; C is a constant not equal to 0, indicating that the adsorption of SO₂ is not completely through the form of intra-particle diffusion, and a small amount of chemisorption exists. And it is the compound effect of multiple adsorption mechanisms.

Air Pollution Control, Zeolite Molecular Sieve, Adsorbent, Flue Gas Purification, Sulfur Dioxide

Qian, D. , Zheng, Y. , Shi, P. , Su, W. , Tong, Z. , Liang, B. and Wang, Y. (2022) The Performance Study on Adsorption of SO₂ of CuO Modifying 13X Zeolite Molecular Sieve. American Journal of Analytical Chemistry, 13, 461-475. doi: 10.4236/ajac.2022.1311031.