Competitive adsorption of NO,SO2 and H2O onto mordenite synthesized from perlite |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USA;1. Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;2. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;1. Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, China;2. CAS Key Laboratory of Inorganic Coating Material, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;1. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Institute of Atmospheric Sciences, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;2. Shanghai Institute of Eco-Chongming (SIEC), No.3663 Northern Zhongshan Road, Shanghai 200062, China |
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| Abstract: | A new material, mordenite synthesized from volcanic ash (perlite) in the presence of sodium salts, has been shown to be a weak sorbent for NO and a strong and reversible sorbent for SO2. The mordenite's capacity to adsorb SO2 was found to be related to the amount of sodium present in the material. Capacities as high as 8 wt% were achieved at 1250 ppm of SO2 in helium at 25°C. In multicycle tests the mordenite maintained its capacity after more than 40 cycles when desorbing the SO2 at 300°C. The adsorption rate of SO2 in the absence of water was modelled and the adsorption activation energy was found to be 3.2 kcal mol−1. Water significantly decreased the mordenite's capacity to adsorb SO2 and also caused the SO2 to be chromatographically desorbed in a roll-up peak. In these water-SO2 adsorption experiments a peculiar breakthrough was observed for water, where the water concentration exiting the bed first decreased and then increased. This peculiar water breakthrough could not be explained by assuming independent adsorption of the two species, but was qualitatively predicted by assuming that water adsorption is enhanced by the presence of adsorbed SO2. |
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