Control of mercury emissions from coal-combustion flue gases using CuCl2-modified zeolite and evaluating the cobenefit effects on SO2 and NO removal
Journal
Fuel Processing Technology
Journal Volume
126
Pages
138
Date Issued
2014-01-01
Author(s)
Abstract
The effects of CuCl2 impregnation on the physical and chemical properties and the Hg0 removal effectiveness of zeolite MCM-41 (MCM) were examined. Multipollutant removal potentials of the resulting samples on simultaneous capture of SO2 and NO were also evaluated. Overall, CuCl2 impregnation within 2-16% reduced the total surface area and pore volume of MCM. The introduced CuCl2 caused the impregnated MCM becoming a microporous adsorbent. The Hg0 adsorption capacities of CuCl2-impregnated MCMs were greater than those of the untreated sample under both N2 and simulated flue gas conditions. When the CuCl2 impregnation content was = 8 wt%, however, the Hg0 adsorption capacity decreased because CuCl2 impregnation in excess amounts hindered certain active sites or blocked the pores. Hg0 oxidation tests showed that the average oxidation percentages of MCM-4% and MCM-16% were 26.7% and 53.7% respectively in the flue gas condition, compared to < 26% in the N2 condition. After CuCl2 impregnation, the SO2 removal of MCM samples decreased from 42.3% to approximately 38% but NO removal increased from 62.8% to up to 73%, showing that CuCl 2-impregnated MCMs may have greater potentials in simultaneous removal of NO than SO2. Catalytic oxidation appeared to be important in SO2 and NO removal. © 2014 Elsevier B.V.
Subjects
Adsorption | Copper impregnation | Mercury | Multipollutant | Oxidation
SDGs
Publisher
ELSEVIER SCIENCE BV
Type
journal article