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Oxidation of gaseous elemental mercury by hydrochloric acid over CuCl2/TiO2-based catalysts in SCR process

Paper ID Volume ID Publish Year Pages File Format Full-Text
47237 46464 2010 7 PDF Available
Title
Oxidation of gaseous elemental mercury by hydrochloric acid over CuCl2/TiO2-based catalysts in SCR process
Abstract

CuCl2/TiO2-based catalysts were examined to investigate the role of copper chloride for the oxidation of gaseous elemental mercury in selective catalytic reduction (SCR) process. CuCl2 on CuCl2/TiO2 catalyst was decomposed releasing Cl by calcination at high temperatures and restored to its original form by being exposed to gas phase HCl, reversibly. The activity for mercury oxidation was significantly increased with the increase of CuCl2 loading and HCl concentration. CuCl2/TiO2 catalysts revealed high activity for mercury oxidation even in the absence of HCl. This suggests that mercury oxidation could occur via a Mars–Maessen mechanism by which adsorbed or weakly bound Hg0 would react with Cl in CuCl2 that is replenished from gas phase HCl. However, the activity of CuCl2-loaded catalysts for NO removal considerably decreased with the increase of temperature above 300–350 °C, which may be due to the ability of CuCl2 for NH3 oxidation in SCR reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ CuCl2/TiO2 catalysts revealed much higher activity for mercury oxidation than commercial SCR catalyst. ▶ Cl species in CuCl2 act as chlorine source to oxidize elemental mercury to oxidized mercury. ▶ CuCl2 is replenished from gas phase HCl. ▶ The oxidation of Hg0 to Hg2+ could occur via a Mars-Maessen mechanism.

Keywords
Mercury oxidation; Hydrogen chloride; Elemental and oxidized mercury; CuCl2 catalyst; Selective catalytic reduction
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Oxidation of gaseous elemental mercury by hydrochloric acid over CuCl2/TiO2-based catalysts in SCR process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 272–278
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us