Experimental study of mercury removal from exhaust gases

Abstract

An initial study has been made of the use of synthetic zeolites for mercury capture from exhaust gases. Synthetic zeolites (Na-X and Na-P1), and for comparison a natural zeolite (clinoptilolite) and activated carbon with bromine (AC/Br) were tested for mercury uptake from a gaseous stream. The materials were subjected to mercury adsorption tests and their thermal stability was evaluated. The untreated synthetic zeolites had negligible mercury uptake, but after impregnation with silver, the adsorption of mercury was markedly improved.The synthetic zeolite Na-X impregnated with silver adsorbed significantly more mercury before breakthrough than the activated carbon impregnated with bromine, indicating the potential of zeolite derived from coal fly ash as a new sorbent for capture of mercury from flue gases.

SEM-EDS Observation of Structure Changes in Synthetic Zeolites Modified for CO2 Capture Needs

“…The morphological forms and the chemical composition were determined by the means of a scanning electron microscope (SEM) FEI Quanta 250 FEG equipped with a system of chemical composition analysis based on energy dispersive X-ray-EDS of EDAX company [16].…”

“…The measurements were done within the angle range of 5-65 2θ. Philips X'Pert Highscore software was used to process the diffraction data as well as the identification of mineral phases was based on the PDF-2 release 2010 database formalized by the ICDD [16].…”

“…One of the latest solutions of fly ash utilization is its usage in the synthesis of zeolites [5,6], which (because of its unique properties) are used in many fields of environmental engineering and protection among others refining of crude oil [7], the removal of ammonium ions from wastewater [8,9] and heavy metals [10] or radionuclides from mine waters [11] but also in the separation/adsorption of gases, such as CO 2 [12,13], SO 2 [14] or gaseous forms of mercury [15,16].…”

Continuous Flow Synthesis of Zeolite-A from Coal Fly Ash Utilizing Microwave Irradiation with Recycled Liquid Stream

“…Due to these abilities they find many potential applications in the fields of pollution control (Moreno et al, 2001), radioactive waste management (Malekpour et al, 2008;Sinha et al, 1995), petrochemical reactions (Landau et al, 2003;Babajide et al, 2012), water purification (Savage and Diallo, 2005;Theron et al, 2010;Shoumkova, 2011;Fan et al, 2008), purification of gasses (Srinivasan and Grutzeck, 1999;Cheung and Hedin, 2014;Wdowin et al, 2014) and agriculture (Khan et al, 2013).…”

Modeling and experimental studies of in-duct mercury capture by activated carbon injection in an entrained flow reactor

“…Hg 2+ is soluble in water and can be easily removed by the wet flue gas desulfurization (WFGD) facilities. Hg p can be captured with fly ash in typical particle control devices (PCDs) such as electrostatic precipitators (ESPs) and fabric filters (FFs) [8][9][10]. However, it is difficult to remove Hg 0 by WFGD or PCDs because of the high volatility and insolubility [11,12].…”