Author : Ying Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (662 download)
Book Synopsis Removal of Elemental Mercury from Flue Gas Using Nanostructured Silica/titania/vanadia Composites by : Ying Li
Download or read book Removal of Elemental Mercury from Flue Gas Using Nanostructured Silica/titania/vanadia Composites written by Ying Li and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: As a highly toxic pollutant, mercury (Hg) tends to bioaccumulate in the food chain and exerts adverse effects on human health. The U.S. EPA issued the Clean Air Mercury Rule in 2005 to permanently cap and reduce Hg emissions from coal-fired power plants. A low-cost methodology using a SiO2-TiO2 nanocomposite as a photocatalyst has been recently developed to effectively remove elemental Hg (Hg°) under room conditions. In this research, a bench-scale fixed-bed reactor system has been established and Hg° removal on the SiO2-TiO2 nanocomposite was examined under both room and flue gas conditions. A kinetic study showed that Hg oxidation on the SiO2-TiO2 nanocomposite under UV irradiation followed the Langmuir- Hinshelwood rate expression. The flue gas components were found to have significant effects on Hg° removal using the SiO2-TiO2 nanocomposite. HCl and SO2 promoted Hg° oxidation, while water vapor and NO significantly inhibited Hg removal. The mechanisms of these promotional and inhibitory effects were thoroughly explored in this research.