Research on the Impact of Modification Method on 13X Zeolite Molecular Sieve Adsorption Performance for SO2

• Published in: ChemistrySelect (Weinheim) 2024-03, Vol.9 (9), p.n/a
• Main Authors: Da‐yi, Qian, Yuan‐meng, Liu, Pei‐liang, Shi, Zhen‐song, Tong, Wei, Su
• Format: Article
• Language: English
• Subjects: 13X molecular sieve; Adsorbent; Air pollution control; Flue gas purification; Sulfur dioxide
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202302859

The article takes 13X molecular sieve as the object, studies the effects of three modification methods, including calcination temperature, NaOH solution concentration, and CuO and MnO2 loading, on the adsorption performance of SO2 on 13X molecular sieve, and preliminarily explores the adsorption kinetics characteristics of 13X‐xwt % MnO2. The results show that the modification method of loading 13X‐6wt %MnO2 is better, the penetration adsorption time is about 130 minutes, and the maximum penetrable adsorption capacity is 57.8 mg⋅g‐1 .The adsorption kinetics study of 13X‐6wt % MnO2 shows that the R2 of the quasi‐second‐order model is close to 0.99, indicating that the adsorption process follows the quasi‐second‐order kinetic equation. The particle diffusion kinetic model fitting shows that the adsorption process is divided into two stages, the first stage is rapid adsorption, which is mainly controlled by surface adsorption and intraparticle diffusion rate, while the second stage is mainly microporous or chemisorption, with a smaller adsorption amount. Modification modes have important effects on performances of 13X molecular sieves to absorb SO2. Loading of 13X‐6wt %MnO2 was the best, with about 130 min penetration time and a maximum penetration and adsorption capacity of 55.7 mg⋅g−1. Adsorption kinetic characteristics and desorption properties of 13X‐xwt %MnO2 were discussed, showing the adsorption process conformed to the pseudo‐second‐order kinetic equation and was influenced by multiple factors.