Optimization of CO Sorption onto Spent Shale with Diethylenetriamine (DETA) and Ethylenediamine (EDA).

A novel technique was employed to optimize the CO sorption performance of spent shale at elevated pressure-temperature (PT) conditions. Four samples of spent shale prepared from the pyrolysis of oil shale under an anoxic condition were further modified with diethylenetriamine (DETA) and ethylenediamine (EDA) through the impregnation technique to investigate the variations in their physicochemical characteristics and sorption performance. The textural and structural properties of the DETA- and EDA- modified samples revealed a decrease in the surface area from tens of m/g to a unit of m/g due to the amine group dispersing into the available pores, but the pore sizes drastically increased to macropores and led to the creation of micropores.