Amine grafted,pore-expanded MCM-41 for acid gas removal: Effect of grafting temperature,water,and amine type on performance

摘要

The application of pore-expanded MCM-41 mesoporous silica coated with various aminosilanes has been examined by the adsorption of CO_2 from N_2.Extremely high levels of active amine content were achieved with pre-hydrated surfaces and reaction at temperatures below reflux in order to facilitate surface polymerization of the silanes.The various coated materials exhibited CO_2 adsorption capacities,which all exceeded the literature reported values,for both meso-porous and micro-porous materials.Further,the apparent adsorption/desorption rate with the amine functionalized materials was exceedingly high even at low regeneration temperatures.When considering the amine type,the adsorption capacity was found to be dependent on the type and quantity of grafted amine.However,the difference between the diamine and triamine silane was only significant in the apparent adsorption rate as the triamine outperformed the diamine.These properties will result in a large decrease in the cyclic temporal and thermal parameters,and therefore an increase in the gas processed per unit time,when exploited in an adsorption process.