Separation Of Hydrogen And Carbon Dioxide On Activated Mesocarbon Microbeads With High Bet Specific Surface Area

Hydrogen energy as one of high efficiency, clean and idea energy is being received more and more attentions. Hydrogen from industry often includes impurity such as carbon dioxide that have influence for the use of hydrogen, therefore the hydrogen purification had the vital significance regarding the hydrogen application.The activated mesocarbon microbeads(a-MCMBs) as one kind of new carbon material is widely used in the gas storage and purification for the high BET specific surface area and good ability of adsorption. Experimental method and adsorption model are used to study the separation of hydrogen and carbon dioxide on a-MCMBs.Pure and binary adsorption isotherms of carbon dioxide and hydrogen (mole fraction is 1:9) on a-MCMBs were measured using the high-precision intelligent gravimetric analyzer at temperature of 298K, 273K and 268 K and the pressure ranging from 0 to 1.8MPa. Based on the experimental data, Langmuir and Double Langmuir (DL) models are compared. The result indicates that DL model can be used to CO₂-H₂ can be applied to carbon dioxide and hydrogen binary systems well. In order to get adsorption amount of H₂ and CO-2 of mixture and selectivity of CO₂, the combined method of double Langmuir model (DL) and the ideal adsorbed solution theory (IAST) was used. The calculated results indicate that the selectivity of carbon dioxide can reach 73.4 at 268K and 1.7MPa, whichsuggests that the a-MCMBs is anexcellent candidate for the removal of carbon dioxide in hydrogen/carbon dioxide mixtures.