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Investigation of the sorption of mercury vapour from exhaust gas by an Ag-X zeolite

Published online by Cambridge University Press:  02 January 2018

Magdalena Wdowin ,
Mariusz Macherzyński ,
Rafał Panek ,
Jerzy Górecki  and
Wojciech Franus
Magdalena Wdowin*
Affiliation:
The Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Wybickiego 7, 31-261 Kraków, Poland
Mariusz Macherzyński
Affiliation:
AGH University of Science and Technology, Faculty of Energy and Fuels, Mickiewicza 30, 30-059 Kraków, Poland
Rafał Panek
Affiliation:
Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
Jerzy Górecki
Affiliation:
AGH University of Science and Technology, Faculty of Energy and Fuels, Mickiewicza 30, 30-059 Kraków, Poland
Wojciech Franus
Affiliation:
Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
*
*E-mail: wdowin@meeri.pl
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Abstract

The removal of gaseous mercury from flue gases from coal-fired power plants is currently an environmental challenge under investigation. Therefore, the main aim of this paper was to evaluate the suitability of faujasite group zeolites (Na-X) to adsorb mercury compounds. Previous, initial tests showed negligible Hg0 uptake by Na-X zeolite, but silver impregnation improved adsorption markedly. Therefore, the testing of mercury adsorption from flue gases into Ag+- impregnated Na-X synthetic zeolite (Ag-X zeolite) derived from coal fly ash was carried out. This material was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy, X-ray fluorescence and nitrogen adsorption/desorption before being evaluated for mercury removal from exhaust gas. After preliminary mercury adsorption tests (fixed bed) under a nitrogen atmosphere, the adsorbent was examined with a simulated flue gas composition under various conditions, i.e. weight of zeolite, temperature of experiment and zeolite in powder and granulated forms. The removal of mercury was shown to depend on the sorbent texture (powder or granulate), exhaust gas flow rate and contact time, as well as the temperature of the experiment. The Ag-X zeolite tested reduced the level of mercury in the flue gas and, depending on the experimental conditions, long-time mercury breakthrough ranges from 15 to 40% were obtained. The best results for mercury capture were obtained for granulated material.

Keywords

mercury uptakeflue gasNa-X zeolitefly ashAg impregnation
Type
Research Article
Information
Clay Minerals , Volume 50 , Issue 1 , March 2015 , pp. 31 - 40
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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