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Utilizing CO2 and rejected H2 from FP-PEMFC system: A combined experimental and modelling study on CO2 methanation with low H2/CO2 over Ni–La/Al2O3.

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Title: Utilizing CO2 and rejected H2 from FP-PEMFC system: A combined experimental and modelling study on CO2 methanation with low H2/CO2 over Ni–La/Al2O3.
Authors: Öztepe, Cihat1,2 (AUTHOR) cihat.oztepe@bogazici.edu.tr, Mutlu, Ece Cigdem2,3 (AUTHOR) emutlu@ucf.edu, Caglayan, Burcu Selen2,4 (AUTHOR) selenbur@bogazici.edu.tr, Aksoylu, A. Erhan1,2 (AUTHOR) aksoylu@bogazici.edu.tr
Source: International Journal of Hydrogen Energy. Oct2024, Vol. 88, p815-829. 15p.
Subjects: Bimetallic catalysts, Response surfaces (Statistics), Carbon dioxide, Methanation, Temperature effect
Abstract: In an FP-PEMFC system vent, recycling a fraction of CO 2 provides clear benefits for CO 2 utilization and rejected H 2 conversion to methane. However, the low H 2 /CO 2 ratio, deviating from the ideal stoichiometric value, presents challenges. This study examines the effects of temperature, H 2 /CO 2 ratio, residence time (F/W cat ratio), and La promoter loading on CO 2 and H 2 conversions and CH 4 selectivity over Ni–La/γ-Al 2 O 3 catalyst using a Box-Behnken design. Experimentally, higher CO 2 conversion is observed with increased temperature, H 2 /CO 2 , La loading, and reduced F/W. CH 4 selectivity, however, decreases with higher temperature and F/W but improves with higher H 2 /CO 2 and La loading. Modeling highlighted significant interactions, revealing two optimal conditions: for low La loading, high temperature, H 2 /CO 2 , and F/W are favorable; for high La loading, lower temperature and F/W, coupled with a high H 2 /CO 2 , are optimal. These findings necessitate precise control over input factors, especially H 2 /CO 2 , in optimizing methanation under low H 2 /CO 2 conditions. [Display omitted] • Effective CO 2 methanation with low H 2 /CO 2 ratios and optimal catalyst conditions. • Finding complex interaction where traditional kinetic models struggle. • Nonlinear and combined effects of temperature, La loading and/or F/W. • Combined optimization of catalyst formulation and reaction conditions. • Crucial use of RSM unraveling complex relationship for combined input optimization. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In an FP-PEMFC system vent, recycling a fraction of CO 2 provides clear benefits for CO 2 utilization and rejected H 2 conversion to methane. However, the low H 2 /CO 2 ratio, deviating from the ideal stoichiometric value, presents challenges. This study examines the effects of temperature, H 2 /CO 2 ratio, residence time (F/W cat ratio), and La promoter loading on CO 2 and H 2 conversions and CH 4 selectivity over Ni–La/γ-Al 2 O 3 catalyst using a Box-Behnken design. Experimentally, higher CO 2 conversion is observed with increased temperature, H 2 /CO 2 , La loading, and reduced F/W. CH 4 selectivity, however, decreases with higher temperature and F/W but improves with higher H 2 /CO 2 and La loading. Modeling highlighted significant interactions, revealing two optimal conditions: for low La loading, high temperature, H 2 /CO 2 , and F/W are favorable; for high La loading, lower temperature and F/W, coupled with a high H 2 /CO 2 , are optimal. These findings necessitate precise control over input factors, especially H 2 /CO 2 , in optimizing methanation under low H 2 /CO 2 conditions. [Display omitted] • Effective CO 2 methanation with low H 2 /CO 2 ratios and optimal catalyst conditions. • Finding complex interaction where traditional kinetic models struggle. • Nonlinear and combined effects of temperature, La loading and/or F/W. • Combined optimization of catalyst formulation and reaction conditions. • Crucial use of RSM unraveling complex relationship for combined input optimization. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.09.168