Energy & Fuels
Energy & Fuels
4 years ago

Microwave Irradiation Induced High-Efficiency Regeneration for Desulfurized Activated Coke: A Comparative Study with Conventional Thermal Regeneration

Microwave Irradiation Induced High-Efficiency Regeneration for Desulfurized Activated Coke: A Comparative Study with Conventional Thermal Regeneration
Lijie Wang, Zhibin Qu, Yuwen Zhu, Guangbo Zhao, Hui Liu, Fei Sun, Xinxin Pi, Jihui Gao
Low desorption efficiency and inferior adsorbate recovery rate during conductive-heating regeneration have always been the key issues facing activated carbon-based SO2 removal technology, which commonly leads to a short cycling life of an adsorbent. Herein, microwave heating was employed to regenerate desulfurized activated coke, which demonstrates great improvements in regeneration efficiency and cycling desulfurization performances. Compared with the long-time conductive-heating process (30 min), microwave heating shows a more rapid heating rate with just 4 min to achieve complete regeneration. After 10 desulfurization–regeneration cycles, microwave regenerated activated coke (MG-AC) can still maintain a high SO2 removal capacity of 94 mg g–1, more than double than that of thermal regenerated AC (TG-AC). Physicochemical structures analyses confirm that microwave heating selectively activates the adsorbate H2SO4 molecules and thus promotes the porosity development and selective removal of oxygen-containing functional groups. Additionally, surface sulfur species analysis provides a new insight into the adsorbate desorption mechanism that microwave irradiation could create instantaneous high temperature within activated coke and induce deep reduction of H2SO4 to elemental sulfur. This finding is of great significance for the development of high-value sulfur recovery technology. This work also suggests that microwave heating is an attractive method for the high-efficiency regeneration of desulfurized activated coke.

Publisher URL: http://dx.doi.org/10.1021/acs.energyfuels.7b01260

DOI: 10.1021/acs.energyfuels.7b01260

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