Towards high CO2 conversions using Cu/Zn catalysts supported on aluminum fumarate metal-organic framework for methanol synthesis
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Date
Authors
Duma, Zama G.
Moma, John
Langmi, Henrietta Wakuna
Louis, Benoit
Parkhomenko, Ksenia
Musyoka, Nicholas M.
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
Green methanol is a viable alternative for the storage of hydrogen and may be produced
from captured anthropogenic sources of carbon dioxide. The latter was hydrogenated over Cu-ZnO
catalysts supported on an aluminum fumarate metal-organic framework (AlFum MOF). The catalysts,
prepared via slurry phase impregnation, were assessed for thermocatalytic hydrogenation of CO2 to
methanol. PXRD, FTIR, and SBET exhibited a decrease in crystallinity of the AlFum MOF support
after impregnation with Cu-Zn active sites. SEM, SEM-EDS, and TEM revealed that the morphology
of the support is preserved after metal loading, where H2-TPR confirmed the presence of active
sites for hydrogen uptake. The catalysts exhibited good activity, with a doubling in Cu and Zn
loading over the AlFum MOF, resulting in a 4-fold increase in CO2 conversions from 10.8% to 45.6%
and an increase in methanol productivity from 34.4 to 56.5 gMeOH/Kgcat/h. The catalysts exhibited
comparatively high CO selectivity and high yields of H2O, thereby favoring the reverse water-gas
shift reaction. The selectivity of the catalysts towards methanol was found to be 12.9% and 6.9%. The
performance of the catalyst supported on AlFum MOF further highlights the potential use of MOFs
as supports in the heterogeneous thermocatalytic conversion of CO2 to value-added products.
Description
SUPPLEMENTARY MATERIAL : FIGURE S1: Individual elemental maps of 7Cu/3Zn/AlFum MOF. (a) Al K 1; (b) Cu K 1; and (c) Zn K 1; FIGURE S2: Individual elemental maps of 15Cu/6.4Zn/AlFum MOF. (a) Al K 1; (b) Cu K 1; and (c) Zn K 1; FIGURE S3: Derivative TGA plot of AlFum MOF. FIGURE S4: Derivative TGA plot of 7Cu/3ZnO/AlFum MOF; FIGURE S5: Derivative TGA plot of 15Cu/6.4ZnO/AlFum MOF.
Keywords
CO2 hydrogenation, Green methanol, Reverse water-gas shift reaction, Metal-organic frameworks, Catalysis, Aluminum fumarate metal-organic framework (AlFum MOF)
Sustainable Development Goals
Citation
Duma, Z.G.; Moma, J.;
Langmi, H.W.; Louis, B.;
Parkhomenko, K.; Musyoka, N.M.
Towards High CO2 Conversions
Using Cu/Zn Catalysts Supported on
Aluminum Fumarate Metal-Organic
Framework for Methanol Synthesis.
Catalysts 2022, 12, 1104. https://DOI.org/10.3390/catal12101104.