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Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V 2 O 5 -WO 3 /TiO 2 and V 2 O 5 -Ce(SO 4 ) 2 /TiO 2 , was investigated. The catalytic activity of the fresh V 2 O 5 -WO 3 /TiO 2 was higher than that of V 2 O 5 -Ce(SO 4 ) 2 /TiO 2 at low temperatures. V 2 O 5 -Ce(SO 4 ) 2 /TiO 2 performed better than V 2 O 5 -WO 3 /TiO 2 when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO 2 treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO 2 .

The dynamic adsorption isotherms of CO2-EGR were measured by using a Intelligent Gravimetric Analysis system.In the beginning stage of CO2 injection, all the injected CO2 enters into the adsorbent and the mole fraction of CH4 (yCH4) keeps 1.0. The CH4 recovery factor (RCH4) increases. The during of this stage (tcd) depends on the selectivity of CO2 over CH4 ( SCO2/CH4). A adsorbent with large SCO2/CH4 has long tCD. When SCO2/CH4 is greater than 1.0, CO2 reduces the fraction of CH4 in the adsorbed phase (xCH4) and more CH4 is driven out. In the second stage,the injected CO2 competes with CH4 for adsorption. The cumulative RCH4 of this stage is much larger than that of the initial stage. However, yCH4 decrease sharply. pCH4 in the whole CO2 injection is always larger than that before CO2 injection, suggesting CH4 desorption results from the displacement by CO2 rather than from pressure depletion.

The dynamic adsorption isotherms of CO2‐EGR were measured by using an Intelligent Gravimetric Analysis system. In the initial CO2 injecting stage, all the injected CO2 enters into the adsorbent and the mole fraction of CH4 in the gas phase (ynormalCH4) is maintained at 1.0. The CH4 recovery factor (RnormalCH4) increases. The duration of this stage (tCD) depends on the selectivity of CO2 over CH4 (SnormalCO2/normalCH4). An adsorbent with large SnormalCO2/normalCH4 has long tCD. In the second stage, the injected CO2 competes with CH4 for adsorption. The cumulative RnormalCH4 of the second stage is much larger than that of the initial stage. However, ynormalCH4 decreases sharply. pnormalCH4 in the whole CO2 injection is always larger than that before CO2 injection, suggesting that CH4 desorption results from the displacement of CO2 rather than from pressure depletion.

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