Journal of Industrial and Engineering Chemistry, Vol.7, No.5, 326-331, September, 2001
Abatement of NOx through the Adsorption-Desorption Cycle Assisted by Microwave Irradiation
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Microwave energy was employed for the removal of NOx, by repetitive adsorption-desorption cycle over La0.2Sr0.8Co1.0Ox(LSC)/H-ZSM-5 adsorbent having dual functions of NO, adsorption and microwave absorption. The desired desorption temperature in the range from room temperature to 1000 ℃ was achieved successfully within 3 min by the control of LSC loading and microwave input power. The 25% LSC/H-ZSM-5 showed the highest sorption capacity of NOx (0.130 mmol/g). It was found that the adsorption-desorption cycles were reversible and no deactivation was observed even after 10 repeated cycles. When the microwave is applied in the desorption step of NOx, the desorption rate is 5 times faster than that of conventional thermal swing, which resulted in the enriched desorption of NOx in percentage order. The desorption rate was further improved by the presence of water and ten times faster rate was obtained over the water adsorbed LSC/H-ZSM-5.
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