Effects of Sulfur Dioxide and Nitric Oxide on Mercury Oxidation and Reduction under Homogeneous Conditions

This paper is particularly related to elemental mercury (Hg 0 ) oxidation and divalent mercury (Hg 2+ ) reduction under simulated flue gas conditions in the presence of nitric oxide (NO) and sulfur dioxide (SO 2 ). As a powerful oxidant and chlorinating reagent, Cl 2 has the potential for Hg oxidati...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Air & Waste Management Association (1995) 2006-05, Vol.56 (5), p.628-635
Main Authors: Zhao, Yongxin, Mann, Michael D., Olson, Edwin S., Pavlish, John H., Dunham, Grant E.
Format: Article
Language:English
Subjects:
Air Pollutants - chemistry
Applied sciences
Atmospheric pollution
Chemical engineering
Chlorine - chemistry
Coal
Environmental impact
Exact sciences and technology
General processes of purification and dust removal
Hazardous materials
Health aspects
Mercury
Mercury - chemistry
Nitric oxide
Nitric Oxide - chemistry
Oxidation
Oxidation-Reduction
Oxidation-reduction reaction
Pollution
Power Plants
Prevention and purification methods
Public health
Reactors
Sulfur Dioxide - chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper is particularly related to elemental mercury (Hg 0 ) oxidation and divalent mercury (Hg 2+ ) reduction under simulated flue gas conditions in the presence of nitric oxide (NO) and sulfur dioxide (SO 2 ). As a powerful oxidant and chlorinating reagent, Cl 2 has the potential for Hg oxidation. However, the detailed mechanism for the interactions, especially among chlorine (Cl)-containing species, SO 2 , NO, as well as H 2 O, remains ambiguous. Research described in this paper therefore focused on the impacts of SO 2 and NO on Hg 0 oxidation and Hg 2+ reduction with the intent of unraveling unrecognized interactions among Cl species, SO 2 , and NO most importantly in the presence of H 2 O. The experimental results demonstrated that SO 2 and NO had pronounced inhibitory effects on Hg 0 oxidation at high temperatures when H 2 O was also present in the gas blend. Such a demonstration was further confirmed by the reduction of Hg 2+ back into its elemental form. Data revealed that SO 2 and NO were capable of promoting homogeneous reduction of Hg 2+ to Hg 0 with H 2 O being present. However, the above inhibition or promotion disappeared under homogeneous conditions when H 2 O was removed from the gas blend.
ISSN:1096-2247
2162-2906
DOI:10.1080/10473289.2006.10464483