Selenium Removal Using Ca-Based Sorbents: Reaction Kinetics

Autor:	Suhas K. Mahuli, Rajeev Agnihotri, Liang-Shih Fan, S. Chauk
Rok vydání:	1998
Předmět:	Chemical kinetics Reaction rate Reaction rate constant Order of reaction Chemistry Inorganic chemistry Environmental Chemistry chemistry.chemical_element General Chemistry Activation energy Selenium Oxide Chemical reaction Selenium
Zdroj:	Environmental Science & Technology. 32:1841-1846
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es971119j
Popis:	Selenium, along with mercury and halides, represents one of the most volatile trace metallic emissions from coal-fired combustors and utility boilers. Calcium-based sorbents are shown to capture selenium oxide via a chemical reaction leading to the formation of calcium selenite. In this study, intrinsic kinetics of this chemical interaction is investigated. Experiments are conducted to obtain initial reaction rate and to determine basic kinetic parameters such as activation energy of the reaction, order of reaction with respect to the gas-phase selenium concentration, and influence of sorbent initial surface area. Experimental investigations are conducted in a dif ferential-bed flow-through reactor system at 400−600 °C temperature conditions with SeO2 partial pressure in the range of 5−30 Pa. Activation energy of the reaction of 4.03 kcal/gmol is obtained, and the reaction is found to have an order of 0.67, with respect to SeO2 partial pressure. Rate of reaction is determined to vary with the initial sorb...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3e28da3956ba9e52189bf5d52258a25c https://doi.org/10.1021/es971119j Zobrazit plný text záznamu