Adsorption separation of carbon dioxide from flue gas of natural gas-fired boiler by a novel nanoporous “molecular basket” adsorbent
Adsorption separation of carbon dioxide from flue gas of natural gas-fired boiler by a novel nanoporous “molecular basket” adsorbent
复制标题
DOI：
10.1016/j.fuproc.2005.01.002
复制
发表时间：
2005-10
影响因子：
7.5
通讯作者：
Xiaochun Xu;Chunshan Song;B. Miller;A. Scaroni
中科院分区：
文献类型：
--
作者：
Xiaochun Xu;Chunshan Song;B. Miller;A. Scaroni
研制了一种新型纳米多孔CO2“分子筐”吸附剂，并将其应用于天然气锅炉烟气中CO2的分离。将聚乙烯亚胺（PEI）均匀分散到介孔分子筛MCM-41的孔中，制备了纳米多孔CO2“分子筐”吸附剂。MCM-41和PEI的使用对co2的吸附有协同作用。PEI对co2的吸附/解吸速率也有很大提高。吸附分离结果表明，该吸附剂可选择性地从模拟烟气和天然气锅炉烟气中分离co2。吸附剂对烟气中N2、o2和CO的吸附量很小。水分对烟气中co2的吸附分离有促进作用。吸附剂同时吸附烟气中的co2和nox。co2的吸附量是NOx的3000倍左右。该吸附剂在多次循环吸附/脱附操作中表现稳定。然而，在吸附后，很少有nox被解吸，这表明在这种新型吸附剂捕获二氧化碳之前，需要预先去除烟气中的nox。
A novel nanoporous CO2“molecular basket” adsorbent has been developed and applied in the separation of CO2from the flue gas of a natural gas fired boiler. The nanoporous CO2“molecular basket” adsorbent was prepared by uniformly dispersing polyethylenimine (PEI) into the pores of mesoporous molecular sieve MCM-41. The use of MCM-41 and PEI had a synergetic effect on the CO2adsorption. The rates of CO2adsorption/desorption of PEI were also greatly improved. Adsorption separation results showed that CO2was selectively separated from simulated flue gas and flue gas of a natural gas-fired boiler by using this novel adsorbent. The adsorbent adsorbed very little N2, O2and CO in the flue gas. Moisture had a promoting effect on the adsorption separation of CO2from flue gas. The adsorbent simultaneously adsorbed CO2and NOxfrom flue gas. The adsorbed amount of CO2was around 3000 times larger than that of NOx. The adsorbent was stable in several cyclic adsorption/desorption operations. However, very little NOxdesorbed after adsorption indicating the need for pre-removal of NOxfrom flue gas before capture of CO2by this novel adsorbent.