AVILA adolfo Maria
congresos y reuniones científicas
Process Optimization based screening and design of adsorbent materials for post-combustion CO2 capture
A.K. RAJAGOPALAN; ADOLFO M. AVILA; A. RAJENDRAN
29 May - 3 June 2016 Graf-Zeppelin-Haus, Friedrichshafen/Lake Constance
Congreso; 12th International Conference on the Fundamentals of Adsorption; 2016
Recent interest in carbon capture has led to development of hundreds of adsorbents. The selection of the adsorbents and analyzing their performance for a given process is a challenging task. Usually, the expected performances of these adsorbents are evaluated by inspecting the isotherms and using simple screening metrics (selectivity, working capacities, figures of merit, etc.), whereas very few claims are based on process-scale studies. In this work, we present a systematic approach to screen adsorbents for post-combustion CO2 capture which accounts for the complexities associated with the process and gives an overall picture of the adsorbent performance for the chosen process using a pressure swing adsorption (PSA) cycle model coupled with a genetic algorithm based optimization with an objective to maximize purity/recovery and maximize productivity/minimize energy. By choosing 4 adsorbents reported in the literature and performing rigorous process optimization we show that adsorption metrics are not reliable indicators of process performance. Further, we ask the question ?What should be the characteristics of an ideal adsorbent for post-combustion CO2 capture that will be effective at a process level?? We explore this question by systematically studying the effect of CO2 and N2 adsorption on hypothetical materials. The optimization study considers both material properties and process operating variables. Keen insights from this study point to the fact that in adsorptive CO2 capture, the removal of N2 is often more challenging than capturing CO2. This study provides key-directions for adsorbent development that can offer higher rates of success for large-scale implementation.