Investigation of iron oxide supported on activated coke for catalytic reduction of sulfur dioxide by carbon monoxide

• Published in: Journal of analytical and applied pyrolysis 2024-05, Vol.179, p.106488, Article 106488
• Main Authors: Li, Shanchuan, Feng, Tai, Kong, Qiwen, Li, Jun, Liu, Peiyi, Ni, Peng, Wang, Cuiping
• Format: Article
• Language: English
• Subjects: Activated coke; Catalytic reduction; Elemental sulfur; Sulfur dioxide; Support iron catalyst
• ISSN: 0165-2370
• DOI: 10.1016/j.jaap.2024.106488

In view of the low utilization rate of by-product in limestone-gypsum wet flue gas desulfurization process, a method of catalytic reduction of SO2 to elemental sulfur was proposed. In this work, supported iron catalyst using activated coke as supporter was prepared and characterized. Moreover, the performance of SO2 reduction using CO as reducing agent at various Fe loadings, temperatures, gaseous hourly space velocities and CO/SO2 molar ratios was studied. Research shows that, compared with other metals, the highest catalytic activity is achieved over Fe-based catalyst. The iron sulfide is the main active component during the catalytic reduction reaction, hence the catalyst needs to be presulfided before use. The micropores of activated coke become more abundant after loading Fe, whereas excessive increase of Fe loading may bloke the mesopores and weaken the catalytic activity. Higher reaction temperature, lower GHSV and a stoichiometric molar ratio are conducive to the improvement of SO2 conversion and S yield. The catalytic performance at lower temperatures was further improved by loading Co. When the Co loading is 4 wt%, the SO2 conversion rate reaches 90.9% at 400 °C because loading Co enhances the redox performance of the catalyst surface. The findings are instructive for the development of cost-effective carbon-based catalysts for resource recovery of sulfur. •The prepared activated coke supported iron catalyst presents high catalytic performance for reduction of SO2.•Iron sulfide is the active component of the Fe/AC catalyst.•Higher temperature, lower GHSV, stoichiometric CO/SO2 ratio and Fe loading of 15% are favorable for higher catalytic activity.•Presulfidation and Co-doped can improve the catalytic activity of Fe/AC at low temperature.