An Experimental Study of Adsorption Breakthrough Curves for CO2/CH4 Separation in a Fixed Bed of Nanoporous Shaped Copper Trimesate Metal Organic Framework

Copper trimesate (Cu-BTC) MOF has been pointed out as a promising adsorbent for separatingcarbon dioxide from methane. However, MOF’s need to be shaped prior to their use in packed bedadsorbers in order to reduce pressure drop; on the other hand, the production of mechanically resistantshaped bodies reduces their adsorption performance. In this work, Cu-BTC tablets provided by BASFare evaluated to perform CO2/CH4 separation through adsorption. The adsorption capacity of purecarbon dioxide from methane was measured in a magnetic suspension balance between temperaturesof 308 and 373 K up to a pressure of 700 kPa. The evaluated material presents higher adsorptioncapacity than previously studied shaped samples with a carbon dioxide and methane adsorptioncapacity up to 3.07 and 0.63 mol.kg-1 at 100 kPa and 308 K respectively. Moreover, the experimentaldata were fitted with the Langmuir model. Isosteric heats of adsorption were obtained to be 22.8 and15.1 kJ/mol for CO2 and CH4 on Cu-BTC tablets respectively, which indicates a strong adsorption ofcarbon dioxide on these adsorbents. Also, single and binary breakthrough curves were measured inthe same temperature range and atmospheric pressure by using Cu-BTC tablets as the adsorbent. Thepreferential adsorption capacity of CO2 on nanoporous copper trimesate (Cu-BTC) indicates that thismaterial can be used for methane purification from natural gas.

کلیدواژه ها:

Adsorption ، CO2/CH4 Separation ، Cu-BTC ، Metal Organic Framework