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首页> 外文期刊>Journal of the Taiwan Institute of Chemical Engineers >Effect of operating parameters of potassium carbonate supported on gamma alumina (K2CO3/gamma-Al2O3) on CO2 capture capacity using depressurized regeneration
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Effect of operating parameters of potassium carbonate supported on gamma alumina (K2CO3/gamma-Al2O3) on CO2 capture capacity using depressurized regeneration

机译：γ氧化铝（K2CO3 /γ-Al2O3）对γ氧化钾（K2CO3 /γ-AL2O3）的碳酸钾操作参数对CO2捕获能力的抑制再生

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摘要

Potassium carbonate (K2CO3) loaded at 17% by weight (wt.%) on a gamma alumina (gamma-Al2O3) support was prepared by impregnation and then employed to adsorb carbon dioxide (CO2) under a turbulent fluidized bed regime in a glass riser-sorber. The spent K2CO3/gamma-Al2O3 sorbent was regenerated in situ by depressurization at 0.8 or 2 atm for 2 or 20 min. The CO2 sorption occurred by both chemical sorption and physical adsorption and the total sorption capacity was not significantly dependent on the sorbent regeneration time (2 or 20 min) or regeneration cycles (1-3), but was strongly dependent upon the regeneration pressure, being better at 0.2 than at 0.8 atm. There was no detectable formation of inactive species. such as KAI(CO3)(OH)(2) H2O), on the regenerated sorbent and the meso-pore type IV surface area was not affected by the number of regeneration cycles. Rather the relocation of water on the sorbent surface in the hydrothermal treatment after sorbent regeneration is hypothesized to have played an important role in the CO2 capture capacity. This was because the accumulation of water near the pore entrance rather than deep inside the pore reduced the average pore diameter and increased the average pore volume when regenerated at 0.8 atm, but not at 0.2 atm. The regenerated sorbent (at 0.2 atm for 2 min) had a CO2 capture capacity of about 95% of that of the fresh adsorbent. As the result of the short regeneration time, the depressurization regeneration unit can be much more compact than the conventional heat regeneration unit. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：通过浸渍制备在γ氧化铝（γ-Al2O3）载体上以17重量％（重量％）负载的碳酸钾（K 2 CO 3），然后在玻璃提升板的湍流流化床制度下吸附二氧化碳（CO2）。 -sorber。通过0.8或2atm的减压，2或20分钟原位再生k2CO3 / gamma-Al2O3吸附剂。化学吸附和物理吸附发生的CO 2吸附，总吸附能力没有显着依赖于吸附剂再生时间（2或20分钟）或再生循环（1-3），但强烈依赖于再生压力，存在比0.8 at为0.2在0.8瓦上更好。没有可检测的非活动物种形成。如Kai（CO 3）（OH）（2）H 2 O），在再生的吸附剂和中孔型IV表面积上不受再生循环的数量的影响。相反，在吸附剂再生后，吸附剂表面在吸附剂表面上的水搬迁，而是假设在二氧化碳捕获容量中发挥了重要作用。这是因为孔入口附近的水的积累而不是孔隙内部的水平降低了平均孔径，并且在0.8atm时再生时增加了平均孔体积，但不在0.2atm时。再生吸附剂（0.2 atm 2分钟，2分钟）的CO 2捕获容量约为新鲜吸附剂的95％。作为短再生时间的结果，减压再生单元可以比传统的热再生单元更紧凑。 （c）2018台湾化工工程师研究所。 elsevier b.v出版。保留所有权利。

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