MIL-160(Al) as a Candidate for Biogas Upgrading and CO<sub>2</sub> Capture by Adsorption Processes
Mohsen Karimi, Alexandre Ferreira, Alı́rio E. Rodrigues, Farid Nouar, Christian Serre, José A. C. Silva
Abstract
The microporous bioderived Al dicarboxylate MIL-160(Al) MOF in its shaped form has been evaluated as a candidate for biogas upgrading (BU) and/or carbon capture and storage (CCS) by studying adsorption isotherms of CO 2, CH 4, and N 2 at 313, 343, and 373 K until 8 bar. The isotherms disclosed the following loading capacities: 4.2 (CO 2 ), 2.07 (CH 4 ), and 0.69 (N 2 ) mol/kg at 5.8 bar and 313 K, which fitted with the dual-site Langmuir model. The linear-driving-force coefficients (LDFs) for CO 2 and CH 4 calculated from uptake rate experiments are in the order of 0.021–0.096 and 0.041–0.165 s –1 at 313 K between 0.11 and 2.76 bar, respectively. The Response Surface Methodology (RSM) was also applied to maximize the selectivity for mixtures CO 2 /CH 4 and CO 2 /N 2 with interest for BU or CCS. Breakthrough curve experiments with mixtures CO 2 /CH 4 and CO 2 /N 2 at the optimum selectivity conditions were developed and simulated using ASPEN Adsorption. This work clearly demonstrates the potential of MIL-160(Al) to be used in BU- and/or CCS-related applications.