Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

Catalysts

Beatrice-Andreea Dranga¹  Liliana Lazar¹ 

[1] Department of Chemical Engineering, Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iasi, 73 Prof. D. Mangeron Street, Iasi 700050, Romania;

关键词: mercury oxidation;    catalysts;    Hg^el oxidation mechanisms;    SCR;    noble metal;    transition metal oxide;   

DOI  :  10.3390/catal2010139

来源: mdpi

【 摘 要 】

The removal of mercury from flue gases in scrubbers is greatly facilitated if the mercury is present as water-soluble oxidized species. Therefore, increased mercury oxidation upstream of scrubber devices will improve overall mercury removal. For this purpose heterogeneous catalysts have recently attracted a great deal of interest. Selective catalytic reduction (SCR), noble metal and transition metal oxide based catalysts have been investigated at both the laboratory and plant scale with this objective. A review article published in 2006 covers the progress in the elemental mercury (Hg^el) catalytic oxidation area. This paper brings the review in this area up to date. To this end, 110 papers including several reports and patents are reviewed. For each type of catalyst the possible mechanisms as well as the effect of flue gas components on activity and stability are examined. Advantages and main problems are analyzed. The possible future directions of catalyst development in this environmental research area are outlined.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.