Abstract
Desulfurization is a necessary process to reduce the corrosiveness of natural gas. In this regard, H2S adsorption on porous materials has gained attention in the development of new eco-friendly technologies. Although there are many experimental and theoretical studies about gas adsorption on MOFs, so far, there has been no theoretical work about desulfurization of natural gas or biogas through H2S adsorption on MOF BTC. Therefore, the objective of this study was to preselect by ab initio calculations which metal center M2+, such as Co2+, Ni2+, Cu2+, or Zn2+, has the highest potential for selective desulfurization of natural gas. DFT calculations were performed at B3LYP-D3/6-311++G(2d,p)+LanL2DZ level for H2O, H2S, COS, CO2, and CH4 adsorption on M-BTC MOF clusters in order to obtain adsorption complex equilibrium geometries, adsorption energies and thermodynamic properties. It was found that Zn-BTC MOF cluster has the highest potential for selective H2S removal from dry natural gas streams, since its adsorption energy is −79.4 kJ mol−1, which is 2.4 times higher than CH4. Furthermore, H2S adsorption on Zn-BTC MOF is an exothermic process and thermodynamically favorable. Through NBO and EDA analyses, it was found that d electrons transfer from adsorbate to metal center unoccupied orbitals contributes mainly to a possible H2S chemisorption on Zn-BTC and Co-BTC, while for CO2 and CH4 adsorption, non-bonded interactions predominate. Most of the gases coordinate to coordinatively unsaturated site of BTC MOF cluster at axial position, indicating a stronger interaction with metal center compared to linkers.
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Abbreviations
- \(\Delta E\) :
-
Adsorption energy
- \(E\left(X\cdot MOF\right)\) :
-
Adsorption complex energy
- \(E\left(X\right)\) :
-
Adsorbate molecule energy
- \(E\left(MOF\right)\) :
-
MOF cluster energy
- \(\Delta H\) :
-
Integral molar adsorption enthalpy
- \(\Delta G\) :
-
Gibbs free energy of adsorption
- \(\Delta S\) :
-
Adsorption entropy
- B3LYP:
-
Becke-3 parameter-Lee–Yang–Parr functional
- D3:
-
Grimme’s empirical dispersion correction
- NBO:
-
Natural bond orbital
- ALMO:
-
Absolutely localized molecular orbitals
- EDA:
-
Energy decomposition analysis
- Scf:
-
Self-consitent field
- DFT:
-
Density functional theory
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This work was supported by National Laboratory for Scientific Computing (LNCC), National Council for Scientific and Technological Development (CNPq) Grant ID: 141219/2021-1 and Coordination for the Improvement of Higher Education Personnel (CAPES) Grant ID: 88882.449152/2019-01.
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MUCB: All theoretical calculations, literature search, write the original paper and revise the manuscript. GHP: Theoretical calculations and help to write the manuscript. LHdO was the supervisor of this manuscript and helped to write and revise the manuscript, to discuss the results, to prepare the figures and tables and corrected English Grammar. PAA is the coordinator of this research, coordinator od Laboratory of Adosrption and Ion Exchange, and helped to revise the manuscript, to discuss the results, to prepare the figures and tables and revise the final version.
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Braga, M.U.C., Perin, G.H., de Oliveira, L.H. et al. DFT calculations for adsorption of H2S and other natural gas compounds on M-BTC MOF clusters. Adsorption (2024). https://doi.org/10.1007/s10450-024-00439-w
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DOI: https://doi.org/10.1007/s10450-024-00439-w