Percorrer por autor "Siqueira, Rafael M."
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- Biogas upgrading using shaped MOF MIL-160(Al) by pressure swing adsorption process: Experimental and dynamic modelling assessmentPublication . Karimi, Mohsen; Siqueira, Rafael M.; Rodrigues, Alírio; Nouar, Farid; Silva, José A.C.; Serre, Christian; Ferreira, AlexandreBiogas has been introduced as a sustainable source of energy, which is considered as a promising alternative for conventional fossil fuels. Indeed, biogas requires to be upgraded from the impurities, specifically, carbon dioxide to be commercially utilized. In this study, the potential of shaped form MIL-160(Al) as a water stable Al dicarboxylate microporous MOF has been assessed concerning the biogas upgrading application. To this end, firstly, the dynamic fixed-bed adsorption of carbon dioxide and methane was investigated at 313 K and 4.0 bar. The measured breakthrough outcomes were simulated with a developed mathematical model, which the results confirmed an acceptable potential of model predictions. Afterwards, a pressure swing adsorption (PSA) process with 5-steps was designed relying on dynamic equilibrium results, and experimentally validated by a lab-scale PSA set-up for a 50:50 CO2/CH4 mixture. Finally, an industrial PSA process was designed to have a precise knowledge on the potential of MIL-160(Al) for biogas upgrading for large scale applications. The results demonstrated the purity and recovery of methane around 99 % and 63 %, respectively, which indicated the appealing capacity of this adsorbent for such a purpose.
- Integrated experimental, process simulation, and techno-economic assessment of biogas upgrading via pressure/vacuum swing adsorptionPublication . Karimi, Mohsen; Siqueira, Rafael M.; Shirzad, Mohammad; Ferreira, Alexandre F.P.; Rodrigues, Alírio; Silva, José A.C.This study presents an integrated approach in biogas upgrading technology through the development and optimization of a shaped MIL-160(Al)-based pressure/vacuum swing adsorption (PSA/VPSA) system. Combining detailed experimental investigations with comprehensive process modeling and techno-economic analysis, we demonstrate a complete pathway from fundamental dynamic adsorption to industrial implementation. Breakthrough tests reveal notable CO2/CH2 separation performance with shaped MIL-160(Al), while 23 cyclic PSA experiments achieved over 90 % methane purity. Advanced process modeling, validated with less than 5 % deviation from experimental data, enables successful scale-up to industrial VPSA configurations, where 38 distinct cases were evaluated to identify an optimal system producing 99.81 % pipeline-quality biomethane with 92.6 % recovery. Our holistic techno-economic assessment reveals the system's acceptable economic viability, with the total capital expenditure (CapEx) of $14.33 million. Accordingly, this work provides clear methodological insights that strengthen the understanding of MIL-160(Al)-based PSA/VPSA process and support its potential application for biogas upgrading.
- Separation of CO2/N2 onto Shaped MOF MIL-160(Al) Using the Pressure Swing Adsorption Process for Post-combustion ApplicationPublication . Karimi, Mohsen; Siqueira, Rafael M.; Rodrigues, Alírio; Nouar, Farid; Silva, José A.C.; Serre, Christian; Ferreira, Alexandre F.P.Adsorption processes have already been considered as an appealing technology for carbon capture and climate change mitigation. Accordingly, this work investigated the capacity of shaped MIL-160(Al) as a water stable bioderived Al dicarboxylate microporous metal-organic framework for separation of carbon dioxide and nitrogen concerning postcombustion application. First, breakthrough experiments of carbon dioxide and nitrogen were accomplished at 313 K and 4.0 bar. Then, a set of equations/relations were considered to model the dynamic fixed-bed tests, in which the outcomes proved the capacity of the developed model for such a purpose. Next, a pressure swing adsorption (PSA) process with five steps, including pressurization, feed, rinse, blowdown, and purge, was planned and validated using performed experiments in a laboratory-scale PSA setup. In the end, an industrial PSA process was designed to attain a better grasp of the capacity of MIL-160(Al) for postcombustion application. The results indicated an exciting potential of this adsorbent for postcombustion carbon capture, with the purity and recovery of carbon dioxide around 67.3 and 99.1%, respectively.