This pilot plant study covered the CO2 absorption potential of a novel bi-solvent blend containin... more This pilot plant study covered the CO2 absorption potential of a novel bi-solvent blend containing AMP and 1,5–diamino–2–methylpentane (DA2MP). The CO2 concentration was kept at 15.1 vol.% to represent the flue gas from a coal-fired power plant. The simulated flue gas flow rate and the amine volumetric flow rate were 14 SLPM and 50 ml/min respectively. Comparative CO2 absorption analysis was conducted for the AMP-DA2MP blend and MEA (5 kmol/m3 or 30 wt.%). The concentration of AMP is 2 kmol/m3 while that of DA2MP was varied from 2 kmol/m3 to 3 kmol/m3 making the total concentration 4 kmol/m3 and 5 kmol/m3. The comparative analysis is based on rich amine loading, CO2 absorption rate, absorber overall mass transfer coefficient, and initial amine solution cost. The parametric effect of lean amine loading on the above-mentioned parameters was also investigated. Pilot plant results showed that the rich amine loading, CO2 absorption rate and absorber mass transfer coefficient of the AMP-D...
Abstract A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9 nm for cott... more Abstract A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9 nm for cotton linter and linen, respectively, was developed. A series of polyvinyl alcohol (PVA)/nano-cellulose films were cast. Mechanical, biodegradation and scanning electron micrograph (SEM) of nano-cellulose-filled PVA films were studied. With the addition of 20% nano-cellulose from linen there was an increase in the tensile strength and percentage elongation at break. The SEM indicates the change in the morphological structure of the PVA films in the presence of different percent of nano-cellulose.
Correction for ‘Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(ii) complexes’ by Phili... more Correction for ‘Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(ii) complexes’ by Philipp Dierks et al., Chem. Commun., 2021, 57, 6640–6643, https://doi.org/10.1039/D1CC01716K.
Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) an... more Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies.
2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO), 2017
Development of a highly efficient, nickel-based nano-catalyst in the carbon dioxide reformation o... more Development of a highly efficient, nickel-based nano-catalyst in the carbon dioxide reformation of methane is reported. The alumina supported Ni-based catalyst with a metal loading of 5wt% was prepared via solution combustion synthesis (SCS) method and conventional wetness impregnation method. Compared to that of conventional Ni(I) catalyst, the Ni(SCS) catalyst exhibited high activity for methane conversion and superior selectivity for H2 and CO production during dry reforming of methane. This difference in the catalytical performances of both catalysts during the dry reformation of methane was attributed to difference in morphology and chemical structures of the catalysts. The HAADF-EDS analysis of the Ni(SCS)catalyst revealed Ni was homogeneously distributed over the substrate with an average particle size of 7±2.31nm. Additionally, SAED patterns suggested that nickel was mainly observed in the NiAl2O4 phase. These findings were affirmed by the XRD analysis. By contrast the Ni(I)...
Abstract Shale gas is mostly made up of methane and is currently being exploited in fulfilling th... more Abstract Shale gas is mostly made up of methane and is currently being exploited in fulfilling the world’s energy demands. Density Functional Theory (DFT) and Molecular Dynamics (MD) techniques are employed for understanding methane transport in the pores at typical reservoir conditions. Shale, which is made up of clay and quartz-like material, is represented in this study by a combined silica-kaolinite surface. The simulations revealed that the interface is formed by a chemical bond between silicon to two oxygen atoms from the kaolinite surface. Physisorption is the mode of adsorption of methane irrespective of the position of the gas on the interface. However, methane has stronger adsorption on the kaolinite region than the silica region.
International Journal of Greenhouse Gas Control, 2021
Abstract Carbon dioxide enhanced gas recovery (EGR) is a promising technique to sequester CO2 and... more Abstract Carbon dioxide enhanced gas recovery (EGR) is a promising technique to sequester CO2 and boost natural gas recovery from conventional depleted and unconventional tight gas reservoirs. Clay minerals are usually present in sandstone reservoirs and their influence on the efficiency of CO2-EGR is yet to be examined. In this study, the impact of clays on CO2 adsorption was evaluated for different sandstone rocks with various amounts and types of clays in the temperature range from 50–100 °C and pressures up 20 bars. The results showed that the adsorption of CO2 on sandstone rocks depends on the clay type, amount, and distribution. Clay-rich sandstone rocks, which have swellable clays such as illite, showed the highest CO2 uptake at a temperature of 50 °C and a pressure of 20 bars with total CO2 uptake of 4.6 and 2.6 mg/g for Kentucky and Scioto rocks, respectively. In contrast, sandstone samples with low clay content and a considerable percentage of carbonates showed CO2 uptake just above 1.5 mg/g for Bandera sandstone and 1.1 mg/ gm for Berea sandstone at similar conditions. Moreover, raising the temperature to 75 °C decreased the CO2 uptake on sandstones. However, the alteration of clays crystallinity at a temperature of 100 °C improves the CO2 adsorption. Adsorption isotherm analysis revealed that at the CO2 adsorption is monolayer at low temperature (50 °C) and pressure of 20 bars; whereas multilayer adsorption at 75 and 100 °C is predicted by Freundlich isotherm model. The thermodynamic analysis illustrated that the adsorption of CO2 on sandstone rocks is physisorption and exothermic on Kentucky, Scioto, and Berea sandstones and endothermic on Bandera sandstone. Core flooding experiments at 100 °C revealed the potential of CO2-EGR for clay-rich sandstone and highlighted the role of clays distribution.
Abstract The adsorption of gas molecules (CO2, CH4, H2O, H2S and N2) on the “dense” (0 0 1) surfa... more Abstract The adsorption of gas molecules (CO2, CH4, H2O, H2S and N2) on the “dense” (0 0 1) surface of α-quartz has been investigated by means of Density Functional Theory (DFT) for the molecular characterization of Enhanced Gas Recovery (EGR) processes by CO2 injection. Several configurations have been studied for the different compounds. Overall, the five molecules are weakly physisorbed on the surface; no charge transfer takes place and no new bonds are formed. The potential surface is quite flat, with all the different values falling into a range of less than 0.15 eV. Consequently, all the molecules can easily move from a configuration to the other. As for the order of preference, hydrogen sulfide adsorbs the most with a maximum adsorption energy of −0.23 eV, followed by carbon dioxide with −0.21 eV. For the other three molecules (H2O, CH4 and N2), there is no net sequence but values lower than that of CO2 are inferred. Coverage analysis of CO2 and CH4 show that carbon dioxide can replace methane on the surface improving its extraction, but high CO2 concentration could weaken its adsorption, hindering the whole process. These results could prove to be useful in designing the EGR process based on CO2 injection.
This pilot plant study covered the CO2 absorption potential of a novel bi-solvent blend containin... more This pilot plant study covered the CO2 absorption potential of a novel bi-solvent blend containing AMP and 1,5–diamino–2–methylpentane (DA2MP). The CO2 concentration was kept at 15.1 vol.% to represent the flue gas from a coal-fired power plant. The simulated flue gas flow rate and the amine volumetric flow rate were 14 SLPM and 50 ml/min respectively. Comparative CO2 absorption analysis was conducted for the AMP-DA2MP blend and MEA (5 kmol/m3 or 30 wt.%). The concentration of AMP is 2 kmol/m3 while that of DA2MP was varied from 2 kmol/m3 to 3 kmol/m3 making the total concentration 4 kmol/m3 and 5 kmol/m3. The comparative analysis is based on rich amine loading, CO2 absorption rate, absorber overall mass transfer coefficient, and initial amine solution cost. The parametric effect of lean amine loading on the above-mentioned parameters was also investigated. Pilot plant results showed that the rich amine loading, CO2 absorption rate and absorber mass transfer coefficient of the AMP-D...
Abstract A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9 nm for cott... more Abstract A procedure for synthesizing cellulose nanospheres with size of 5.9 and 10.9 nm for cotton linter and linen, respectively, was developed. A series of polyvinyl alcohol (PVA)/nano-cellulose films were cast. Mechanical, biodegradation and scanning electron micrograph (SEM) of nano-cellulose-filled PVA films were studied. With the addition of 20% nano-cellulose from linen there was an increase in the tensile strength and percentage elongation at break. The SEM indicates the change in the morphological structure of the PVA films in the presence of different percent of nano-cellulose.
Correction for ‘Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(ii) complexes’ by Phili... more Correction for ‘Distinct photodynamics of κ-N and κ-C pseudoisomeric iron(ii) complexes’ by Philipp Dierks et al., Chem. Commun., 2021, 57, 6640–6643, https://doi.org/10.1039/D1CC01716K.
Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) an... more Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies.
2017 IEEE 17th International Conference on Nanotechnology (IEEE-NANO), 2017
Development of a highly efficient, nickel-based nano-catalyst in the carbon dioxide reformation o... more Development of a highly efficient, nickel-based nano-catalyst in the carbon dioxide reformation of methane is reported. The alumina supported Ni-based catalyst with a metal loading of 5wt% was prepared via solution combustion synthesis (SCS) method and conventional wetness impregnation method. Compared to that of conventional Ni(I) catalyst, the Ni(SCS) catalyst exhibited high activity for methane conversion and superior selectivity for H2 and CO production during dry reforming of methane. This difference in the catalytical performances of both catalysts during the dry reformation of methane was attributed to difference in morphology and chemical structures of the catalysts. The HAADF-EDS analysis of the Ni(SCS)catalyst revealed Ni was homogeneously distributed over the substrate with an average particle size of 7±2.31nm. Additionally, SAED patterns suggested that nickel was mainly observed in the NiAl2O4 phase. These findings were affirmed by the XRD analysis. By contrast the Ni(I)...
Abstract Shale gas is mostly made up of methane and is currently being exploited in fulfilling th... more Abstract Shale gas is mostly made up of methane and is currently being exploited in fulfilling the world’s energy demands. Density Functional Theory (DFT) and Molecular Dynamics (MD) techniques are employed for understanding methane transport in the pores at typical reservoir conditions. Shale, which is made up of clay and quartz-like material, is represented in this study by a combined silica-kaolinite surface. The simulations revealed that the interface is formed by a chemical bond between silicon to two oxygen atoms from the kaolinite surface. Physisorption is the mode of adsorption of methane irrespective of the position of the gas on the interface. However, methane has stronger adsorption on the kaolinite region than the silica region.
International Journal of Greenhouse Gas Control, 2021
Abstract Carbon dioxide enhanced gas recovery (EGR) is a promising technique to sequester CO2 and... more Abstract Carbon dioxide enhanced gas recovery (EGR) is a promising technique to sequester CO2 and boost natural gas recovery from conventional depleted and unconventional tight gas reservoirs. Clay minerals are usually present in sandstone reservoirs and their influence on the efficiency of CO2-EGR is yet to be examined. In this study, the impact of clays on CO2 adsorption was evaluated for different sandstone rocks with various amounts and types of clays in the temperature range from 50–100 °C and pressures up 20 bars. The results showed that the adsorption of CO2 on sandstone rocks depends on the clay type, amount, and distribution. Clay-rich sandstone rocks, which have swellable clays such as illite, showed the highest CO2 uptake at a temperature of 50 °C and a pressure of 20 bars with total CO2 uptake of 4.6 and 2.6 mg/g for Kentucky and Scioto rocks, respectively. In contrast, sandstone samples with low clay content and a considerable percentage of carbonates showed CO2 uptake just above 1.5 mg/g for Bandera sandstone and 1.1 mg/ gm for Berea sandstone at similar conditions. Moreover, raising the temperature to 75 °C decreased the CO2 uptake on sandstones. However, the alteration of clays crystallinity at a temperature of 100 °C improves the CO2 adsorption. Adsorption isotherm analysis revealed that at the CO2 adsorption is monolayer at low temperature (50 °C) and pressure of 20 bars; whereas multilayer adsorption at 75 and 100 °C is predicted by Freundlich isotherm model. The thermodynamic analysis illustrated that the adsorption of CO2 on sandstone rocks is physisorption and exothermic on Kentucky, Scioto, and Berea sandstones and endothermic on Bandera sandstone. Core flooding experiments at 100 °C revealed the potential of CO2-EGR for clay-rich sandstone and highlighted the role of clays distribution.
Abstract The adsorption of gas molecules (CO2, CH4, H2O, H2S and N2) on the “dense” (0 0 1) surfa... more Abstract The adsorption of gas molecules (CO2, CH4, H2O, H2S and N2) on the “dense” (0 0 1) surface of α-quartz has been investigated by means of Density Functional Theory (DFT) for the molecular characterization of Enhanced Gas Recovery (EGR) processes by CO2 injection. Several configurations have been studied for the different compounds. Overall, the five molecules are weakly physisorbed on the surface; no charge transfer takes place and no new bonds are formed. The potential surface is quite flat, with all the different values falling into a range of less than 0.15 eV. Consequently, all the molecules can easily move from a configuration to the other. As for the order of preference, hydrogen sulfide adsorbs the most with a maximum adsorption energy of −0.23 eV, followed by carbon dioxide with −0.21 eV. For the other three molecules (H2O, CH4 and N2), there is no net sequence but values lower than that of CO2 are inferred. Coverage analysis of CO2 and CH4 show that carbon dioxide can replace methane on the surface improving its extraction, but high CO2 concentration could weaken its adsorption, hindering the whole process. These results could prove to be useful in designing the EGR process based on CO2 injection.
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Papers by Mohammed J Al-Marri