Environmental Materials Division, National Environmental Engineering Research Institute (NEERI-CSIR), Nagpur 440020, India.
J Environ Sci (China). 2012;24(11):1979-84. doi: 10.1016/s1001-0742(11)61022-x.
N-doped mesoporous alumina has been synthesized using chitosan as the biopolymer template. The adsorbent has been thoroughly investigated for the adsorption of CO2 from a simulated flue gas stream (15% CO2 balanced with N2) and compared with commercially available mesoporous alumina procured from SASOL, Germany. CO2 adsorption was studied under different conditions of pretreatment and adsorption temperature, inlet CO2 concentration and in the presence of oxygen and moisture. The adsorption capacity was determined to be 29.4 mg CO2/g of adsorbent at 55 degrees C. This value was observed to be 4 times higher in comparison to that of commercial mesoporous alumina at a temperature of 55 degrees C. Basicity of alumina surface coupled with the presence of nitrogen in template in synthesized sample is responsible for this enhanced CO2 adsorption. Adsorption capacity for CO2 was retained in the presence of oxygen; however moisture had a deteriorating effect on the adsorption capacity reducing it to nearly half the value.
采用壳聚糖作为生物聚合物模板合成了 N 掺杂介孔氧化铝。对吸附剂进行了深入研究，用于从模拟烟道气（15% CO2 与 N2 平衡）中吸附 CO2，并与从德国 SASOL 购得的市售介孔氧化铝进行了比较。在不同的预处理和吸附温度、入口 CO2 浓度以及存在氧气和水分的条件下研究了 CO2 的吸附。在 55°C 时，吸附剂的吸附容量确定为 29.4mg CO2/g。与 55°C 时的商业介孔氧化铝相比，这一数值高 4 倍。合成样品中氧化铝表面的碱性与模板中氮的存在是导致这种增强的 CO2 吸附的原因。在存在氧气的情况下，CO2 的吸附容量得以保留；然而，水分对吸附容量有不利影响，使其降低到近一半的值。
