Enhancement of elemental mercury adsorption by silver supported material |
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| Authors: | Rattabal Khunphonoi Pummarin Khamdahsag Siriluk Chiarakorn Nurak Grisdanurak Adjana Paerungruang Somrudee Predapitakkun |
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| Institution: | 1 Department of Chemical Engineering, Thammasat University, Pathumthani 12120, Thailand;2 Environmental Research Institute, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;3 Division of Environmental Technology, School of Energy, Environment and Materials, King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;4 Petroleum Authority of Thailand (PTT) Research and Technology Institute, Wong-Noi, Ayutthaya 13170, Thailand |
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| Abstract: | Mercury, generally found in natural gas, is extremely hazardous. Although average mercury levels are relatively low, they are further reduced to comply with future mercury regulations, which are stringent in order to avoid releasing to the environment. Herein, vapor mercury adsorption was therefore investigated using two kinds of supports, granular activated carbon (GAC) and titanium dioxide (TiO2). Both supports were impregnated by silver (5 and 15 wt.%), before testing against a commercial adsorbent (sulfur-impregnated activated carbon, SAC). The adsorption isotherm, kinetics, and its thermodynamics of mercury adsorption were reported. The results revealed that Langmuir isotherm provided a better fit to the experimental data. Pseudo second-order was applicable to describe adsorption kinetics. The higher uniform Ag dispersion was a key factor for the higher mercury uptake. TiO2 supported silver adsorbent showed higher mercury adsorption than the commercial one by approximately 2 times. Chemisorption of mercury onto silver active sites was confirmed by an amalgam formation found in the spent adsorbents. |
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| Keywords: | Adsorption Mercury Silver Natural gas Amalgam |
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