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Elemental mercury removal from syngas by porous carbon-supported CuCl2 sorbents.

Authors :
Shen, Fenghua
Liu, Jing
Dong, Yuchen
Wu, Dawei
Gu, Chenkai
Zhang, Zhen
Source :
Fuel. Mar2019, Vol. 239, p138-144. 7p.
Publication Year :
2019

Abstract

Highlights • Porous carbon-supported CuCl 2 was synthesized to remove Hg0 from syngas. • CuCl 2 -PC exhibited superior Hg0 adsorption ability at 200 °C. • Effects of syngas components on Hg0 adsorption were clarified. • XPS analyses were applied to identify the Hg0 adsorption mechanism. Abstract A series of sorbents based on biomass-derived porous carbon-supported CuCl 2 (CuCl 2 -PC) were synthesized and employed for elemental mercury (Hg0) removal from the syngas. The CuCl 2 -PC sorbent with a Cu mass content of 5.6 wt% exhibited superior Hg0 adsorption ability (98.5%) at 200 °C. The meso-/micropores structure of porous carbon is favorable for the well-dispersing of CuCl 2 in the inner pores with the formations of abundant Cu and Cl active sites, and beneficial for Hg0 fast transfer among pores, thereby enhancing the effective collision of Hg0 with active sites. Hg-Cu compound and mercury chlorides could be formed by the reactions of Hg0 with Cu and Cl species. The effects of syngas components on Hg0 adsorption ability of sorbent were investigated. HCl improved Hg0 adsorption by increasing the Cl concentration on sorbent surface. CO, H 2 S and H 2 O did not exhibit notable effects on Hg0 adsorption. Although H 2 could not affect the surface chemistry of sorbent, it could occupy the inner pores of sorbent, thereby making the interactions of Hg0 with active sites difficult. The amount of Cu2+ on sorbent surface decreased after Hg0 adsorption, indicating that the oxidation state of copper changed from Cu2+ to Cu+ under syngas atmosphere. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00162361
Volume :
239
Database :
Academic Search Index
Journal :
Fuel
Publication Type :
Academic Journal
Accession number :
133871725
Full Text :
https://doi.org/10.1016/j.fuel.2018.11.016