Synergistic Adsorption and In Situ Catalytic Conversion of SO<sub>2</sub>by Transformed Bimetal-Phenolic Functionalized Biomass
Gao Xiao, Qiuping Xie, Yunxiang He, Xin Huang, Joseph J. Richardson, Manna Dai, Jian Hua, Xin Li, Junling Guo, Xuepin Liao, Bi Shi
Abstract
SO 2 removal is critical to flue gas purification. However, based on performance and cost, materials under development are hardly adequate substitutes for active carbon-based materials. Here, we engineered biomass-derived nanostructured carbon nanofibers integrated with highly dispersed bimetallic Ti/CoO x nanoparticles through the thermal transition of metal-phenolic functionalized industrial leather wastes for synergistic SO 2 adsorption and in situ catalytic conversion. The generation of surface-SO 3 2– and peroxide species (O 2 2– ) by Ti/CoO x achieved catalytic conversion of adsorbed SO 2 into value-added liquid H 2 SO 4, which can be discharged from porous nanofibers. This approach can also avoid the accumulation of the adsorbed SO 2, thereby achieving high desulfurization activity and a long operating life over 6000 min, preceding current state-of-the-art active carbon-based desulfurization materials. Combined with the techno-economic and carbon footprint analysis from 36 areas in China, we demonstrated an economically viable and scalable solution for real-world SO 2 removal on the industrial scale.