Heterogeneous catalytic oxidation regeneration of desulfurization-rich liquor with Fe3+ modified chitosan

• Published in: Frontiers in environmental engineering (Lausanne, Switzerland) Switzerland), 2023-03, Vol.2
• Main Authors: Liu, Zhihao, Chen, Zhijie, Chen, Qian, Liu, Luwei, Wang, Yingjie, Shu, Peng, Zhong, Yu, Sun, Zeqin, Qiu, Kui
• Format: Article
• Language: English
• ISSN: 2813-5067; 2813-5067
• DOI: 10.3389/fenve.2023.1167552

To solve the problem of pipeline blockage caused by sulfur deposition in industrial gas wet oxidative desulfurization operations, this study developed an iron-modified chitosan catalyst for the catalytic oxidation regeneration of conventional wet oxidative desulfurization-rich liquids. Detailed characterization results show that Fe 3+ species are successfully coordinated with the chitosan substrate. The results of desulfurization and regeneration experiments showed that the Fe 3+ -modified chitosan could effectively regenerate the desulfurization waste stream and remain stable in the acidic desulfurization stream. The powdered iron-based modified chitosan catalyst prepared with a mass ratio of chitosan to FeCl 3 of 1:5 and glutaraldehyde of 12.5% by mass has better catalytic performance than the microbead counterpart. The regeneration performance of the catalyst was evaluated by the desulfurization performance of the regenerated desulfurization solution. The iron-based modified chitosan shows a good regeneration performance, and the loss of Fe content is less than 1.5% after five runs. This study provides an efficient way to develop cost-effective catalysts for the regeneration of wet oxidative desulfurization-rich liquids.