Deep Removal of COS and Hg<sup>0</sup> by Carbon Aerogel\nin Natural Gas: Good Antipoisoning Properties as well as Synergy Effect\nat Low Temperatures on 0.9PPD-Cu/CA Adsorbent

A collaborative\nCOS conversion of Hg<sup>0</sup> in natural gas\non the nitrogen-doped and copper oxide-supported carbon aerogel (0.9PPD-Cu/CA),\nwhich is synthesized by the <i>p</i>-phenylenediamine\nsources and carbon source of sodium alginate, was proposed to overcome\nthe easy deactivation of the catalyst, high reaction temperature,\nand limited lifespan. At 40 °C, the 0.9PPD-Cu/CA presented a\n100% COS conversion efficiency in the presence of H<sub>2</sub>O;\nmeanwhile, the N doping realized the enhancement of basic density,\nleading to an improved COS conversion, and the intermediates H<sub>2</sub>S in the reaction were wholly adsorbed, implying that 0.9PPD-Cu/CA\nwas a bifunctional carbon material. Furthermore, the Hg<sup>0</sup> addition achieved a synergistic performance as well as higher COS\nyield and a significant lifetime period, in which the sulfur immediate\ncould have a high reactive activity for Hg<sup>0</sup> and the sulfate\nproportion would be alleviated as well. Subsequently, the catalyst\npoisoning would be alleviated after the protection of the collaborative\nprocess by strengthening the electron transfer, consuming the sulfur-based\nproducts, and accelerating the cleavage of the H–S bond. Finally,\nthe synergetic mechanism on COS and Hg<sup>0</sup> on 0.9PPD-Cu/CA\nwas concluded according to the experimental results and sample analysis.\nAdditionally, the effects of space velocity and the regeneration performance\nwere explored.