_applied_  
_sciences_  
_Article_  
Experimental Study on the Elemental Mercury Removal  
Performance and Regeneration Ability of CoO\({}_{x}\)-FeO\({}_{x}\)-Modified ZSM-5 Adsorbents  
[PERSON] 1,2, [PERSON] 1 and [PERSON] 1,*  
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Hg\({}^{0}\) removal performance by modifying ZSM-5 [17]. As reported in the relevant literature, halides, selenides, and metal oxides can be applied as the active additives for Hg\({}^{0}\) capture [18; 19; 20; 21; 22]. Due to the ease of operation, environmental friendliness, and low cost, metal oxide additives are deemed more attractive than others.  
Cobalt oxides, with their unique redox couple Co\({}^{2+}\)/Co\({}^{3+}\), have now attracted widespread attention for Hg\({}^{0}\) removal [23; 24; 25; 26; 27; 28]. In the research conducted by [PERSON] et al., it was suggested that the excellent Hg\({}^{0}\) removal performance could be achieved at 180 \({}^{\circ}\)C, which synthesized a Co\({}_{3}\)O\({}_{4}\)-based catalyst by one-step calcination method for Hg\({}^{0}\) oxidation [29]. [PERSON] et al. reported that Co\({}_{3}\)O\({}_{4}\)-modified fly ash by the wet impregnation method showed good Hg\({}^{0}\) removal performance [30]. Using a single-step hydrothermal method to produce the cobalt-doped CeO\({}_{2}\) catalyst for Hg\({}^{0}\) removal, [PERSON] et al. achieved a Hg\({}^{0}\) removal efficiency of over 90% under a simulated low-rank coal-burning atmosphere [31]. Moreover, Fe-based catalysts performed equally well in the Hg\({}^{0}\) removal process. As indicated by [PERSON] et al., Fe-modified HZSM-5 produced a remarkable Hg\({}^{0}\) removal performance [32]. [PERSON] et al. proposed that the synthesized magnetic Fe-based adsorbent achieved a satisfactory performance in mercury removal [33]. In spite of this, there is still limited research conducted on the efficiency of Co-Fe-modified ZSM-5 adsorbent in Hg\({}^{0}\) removal. Given the above-mentioned advantages of ZSM-5, Co\({}_{x}\), and FeO\({}_{x}\), it is believed that the efficiency of Hg\({}^{0}\) removal could be further enhanced for Co-Fe-modified ZSM-5 materials.  
To achieve this purpose, Co-Fe-decorated ZSM-5 adsorbents were produced in this study to explore their potential in the abatement of Hg\({}^{0}\) in flue gases. To be specific, the physicochemical properties of the adsorbents were characterized through a combination of X-ray diffraction (XRD), N\({}_{2}\) adsorption, scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). Then, it was investigated as to how the Hg\({}^{0}\) removal performance of the adsorbents would be affected by Co/Fe mass ratio, reaction temperature, and flue gas components (O\({}_{2}\), NO, SO\({}_{2}\)). Finally, the level of recyclability and mechanisms of Hg\({}^{0}\) adsorption were examined.