LAUSR

Process intensification, with the aim of reducing the energy consumption of the existing processes, opens the path to exploring diverse operating conditions. As far as adsorption-based processes are concerned, cryogenic temperatures and high pressures are less-explored conditions. In this work, the adsorption equilibria of carbon dioxide, methane, carbon monoxide, nitrogen, and hydrogen are assessed at temperatures of between 223 and 373 K and at pressures of up to 60 bar for acid-functionalized UiO-66(Zr) MOF, the UiO-66(Zr)_(COOH)2, shaped as small granules. UiO-66(Zr)_(COOH)2 is selective for carbon dioxide, presenting the highest adsorption capacities among all of the tested gases. The adsorption capacity then follows the order methane, nitrogen, carbon monoxide, and hydrogen. Indeed, the very low capacity toward carbon monoxide is a remarkable feature of this material. The carbon dioxide/methane ideal selectivity at 220 K, 40 bar, and a feed composition of 99% methane and 1% carbon dioxide is 44. The...