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Iron ore was studied as a CO2 absorbent. Carbonation was carried out by mechanochemical and high temperature–high pressure (HTHP) reactions. Kinetics of the carbonation reactions was studied for the two methods. In the mechanochemical process, it was analyzed as a function of the CO2 pressure and the rotation speed of the planetary ball mill, while in the HTHP process, the kinetics was studied as a function of pressure and temperature. The highest CO2 capture capacities achieved were 3.7341 mmol of CO2/g of sorbent in ball milling (30 bar of CO2 pressure, 400 rpm, 20 h) and 5.4392 mmol of CO2/g of absorbent in HTHP (50 bar of CO2 pressure, 100 °C and 4 h). To overcome the kinetics limitations, water was introduced to all carbonation experiments. The calcination reactions were studied in Argon atmosphere using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. Siderite can be decomposed at the same temperature range (100 °C to 420 °C) for the samples produced by both methods. This range reaches higher temperatures compared with pure iron oxides due to decomposition temperature increase with decreasing purity. Calcination reactions yield magnetite and carbon. A comparison of recyclability (use of the same material in several cycles of carbonation–calcination), kinetics, spent energy, and the amounts of initial material needed to capture 1 ton of CO2, revealed the advantages of the mechanochemical process compared with HTHP.
Eduin Yesid Mora Mendoza; Armando Sarmiento Santos; Enrique Vera López; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent. Processes 2019, 7, 735 .
AMA StyleEduin Yesid Mora Mendoza, Armando Sarmiento Santos, Enrique Vera López, Vadym Drozd, Andriy Durygin, Jiuhua Chen, Surendra K. Saxena. Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent. Processes. 2019; 7 (10):735.
Chicago/Turabian StyleEduin Yesid Mora Mendoza; Armando Sarmiento Santos; Enrique Vera López; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. 2019. "Siderite Formation by Mechanochemical and High Pressure–High Temperature Processes for CO2 Capture Using Iron Ore as the Initial Sorbent." Processes 7, no. 10: 735.
A potential, environmentally friendly production process for refractory metal carbides is investigated whereby methane is used as the reducing agent for many oxides. Using the most recently available thermodynamic data, the optimum conditions for production of binary and ternary carbides, together with hydrogen-rich gases, have been calculated. Our thermodynamic analysis indicates that methane reduction of the oxides is both economic and helpful in reducing carbon emissions. The investigations show that hot syngas from one reactor may be re-used as input to other reactors to minimize the use of energy in carbide production.
Surendra Saxena; Philip Spencer; Vadym Drozd. An alternative, environmentally friendly production process for refractory metal carbides and syngas using methane reduction of the oxide ores. Monatshefte für Chemie - Chemical Monthly 2017, 149, 411 -422.
AMA StyleSurendra Saxena, Philip Spencer, Vadym Drozd. An alternative, environmentally friendly production process for refractory metal carbides and syngas using methane reduction of the oxide ores. Monatshefte für Chemie - Chemical Monthly. 2017; 149 (2):411-422.
Chicago/Turabian StyleSurendra Saxena; Philip Spencer; Vadym Drozd. 2017. "An alternative, environmentally friendly production process for refractory metal carbides and syngas using methane reduction of the oxide ores." Monatshefte für Chemie - Chemical Monthly 149, no. 2: 411-422.
The partially ionic high pressure phase of boron γ-B28 was synthesized at 12 GPa 1500oC using a multi-anvil press. The crystal structure of γ-B28 was confirmed by x-ray diffraction. The γ-B28 phase is metastable at ambient condition. Upon grinding, the sample back transform to α-B12 phase. Optical absorption was conducted to investigate the γ-B28 sample. The optical absorption edge was observed at a wavelength of 725nm indicating a band gap of 1.7 eV for this semiconducting high pressure phase, in a good agreement with theoretical calculation (1.5-1.7 eV).
J. Chen; X. Liang; B. Yang; J. Girard; V. Drozd; Z. Liu. Band Gap of Semiconducting High Pressure Phase of Boron. DEStech Transactions on Materials Science and Engineering 2017, 1 .
AMA StyleJ. Chen, X. Liang, B. Yang, J. Girard, V. Drozd, Z. Liu. Band Gap of Semiconducting High Pressure Phase of Boron. DEStech Transactions on Materials Science and Engineering. 2017; (msce):1.
Chicago/Turabian StyleJ. Chen; X. Liang; B. Yang; J. Girard; V. Drozd; Z. Liu. 2017. "Band Gap of Semiconducting High Pressure Phase of Boron." DEStech Transactions on Materials Science and Engineering , no. msce: 1.
Laser-assisted processing and in-situ characterization of a Ni0.7-Al0.1235-Co0.15-Ti0.0265 alloy were carried out under a range of simultaneous hydrostatic high pressures of ∼30 GPa and high temperature conditions ∼2000°C using a laser-assisted heating in diamond anvil cell with synchrotron X-ray micro-diffraction. The characterization of the microstructure and X-ray diffraction analysis at ambient conditions confirmed the formation of the cuboids of ordered γ′ phase in the disordered γ matrix. The isothermal bulk modulus (B0) and its first-order derivative (B0’) of the alloy were determined to be B0 = 123 ± 9 GPa and B0’ = 5.7 ± 2.8. The in-situ characterization of the alloy at high temperatures under high pressures revealed that the γ′ phase transforms into the tetragonaly distorted D022-type structure. This transformation is similar to the transformation that occurs in the ordered Ni3Al, responsible for the improved strength at high temperatures. High pressure was found to increase the onset temperature of the structural distortion. The pressure–temperature phase diagram of the Ni0.7-Al0.1235-Co0.15-Ti0.0265 up to ∼30 GPa and ∼2000°C was determined and is reported here.
Selva Vennila Raju; Rostislav Hrubiak; Vadym Drozd; Surendra Saxena. Laser-assisted processing of Ni-Al-Co-Ti under high pressure. Materials and Manufacturing Processes 2016, 32, 1606 -1611.
AMA StyleSelva Vennila Raju, Rostislav Hrubiak, Vadym Drozd, Surendra Saxena. Laser-assisted processing of Ni-Al-Co-Ti under high pressure. Materials and Manufacturing Processes. 2016; 32 (14):1606-1611.
Chicago/Turabian StyleSelva Vennila Raju; Rostislav Hrubiak; Vadym Drozd; Surendra Saxena. 2016. "Laser-assisted processing of Ni-Al-Co-Ti under high pressure." Materials and Manufacturing Processes 32, no. 14: 1606-1611.
We have studied the effect of ball milling on alumina mixed nickel, magnetite and Raney nickel on the reaction: 2NaOH(s) + CO (g) = Na2CO3 (s)+ H2 (g) and determined the optimum particle size for the catalysts. The best performance was shown by a 2 h ball milled Raney nickel with average crystallite size of 209 Å. This reaction serves the dual purpose of carbon sequestration and yielding hydrogen gas.
Sushant Kumar; Vadym Drozd; Surendra K. Saxena. Catalytic Studies of Sodium Hydroxide and Carbon Monoxide Reaction. Catalysts 2012, 2, 532 -543.
AMA StyleSushant Kumar, Vadym Drozd, Surendra K. Saxena. Catalytic Studies of Sodium Hydroxide and Carbon Monoxide Reaction. Catalysts. 2012; 2 (4):532-543.
Chicago/Turabian StyleSushant Kumar; Vadym Drozd; Surendra K. Saxena. 2012. "Catalytic Studies of Sodium Hydroxide and Carbon Monoxide Reaction." Catalysts 2, no. 4: 532-543.
Subrahmanyam Garimella; Vadym Drozd; Andriy Durygin; Jiuhua Chen. High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl. Journal of Applied Physics 2012, 111, 112606 .
AMA StyleSubrahmanyam Garimella, Vadym Drozd, Andriy Durygin, Jiuhua Chen. High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl. Journal of Applied Physics. 2012; 111 (11):112606.
Chicago/Turabian StyleSubrahmanyam Garimella; Vadym Drozd; Andriy Durygin; Jiuhua Chen. 2012. "High pressure Raman and x-ray diffraction studies on the decomposition of tungsten carbonyl." Journal of Applied Physics 111, no. 11: 112606.
Rostislav Hrubiak; Vadym Drozd; Ali Karbasi; Surendra K. Saxena. High P-T phase transitions and P-V-T equation of state of hafnium. Journal of Applied Physics 2012, 111, 112612 .
AMA StyleRostislav Hrubiak, Vadym Drozd, Ali Karbasi, Surendra K. Saxena. High P-T phase transitions and P-V-T equation of state of hafnium. Journal of Applied Physics. 2012; 111 (11):112612.
Chicago/Turabian StyleRostislav Hrubiak; Vadym Drozd; Ali Karbasi; Surendra K. Saxena. 2012. "High P-T phase transitions and P-V-T equation of state of hafnium." Journal of Applied Physics 111, no. 11: 112612.
Shah Najiba; Jiuhua Chen; Vadym Drozd; Andriy Durygin; Yongzhou Sun. Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure. Journal of Applied Physics 2012, 111, 112618 .
AMA StyleShah Najiba, Jiuhua Chen, Vadym Drozd, Andriy Durygin, Yongzhou Sun. Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure. Journal of Applied Physics. 2012; 111 (11):112618.
Chicago/Turabian StyleShah Najiba; Jiuhua Chen; Vadym Drozd; Andriy Durygin; Yongzhou Sun. 2012. "Tetragonal to orthorhombic phase transition of ammonia borane at low temperature and high pressure." Journal of Applied Physics 111, no. 11: 112618.
Sushant Kumar; Vadym Drozd; Surendra Saxena. A Catalytic Study of the Modified Coal Gasification Process to Produce Clean Hydrogen Gas. CheM 2012, 2, 20 -26.
AMA StyleSushant Kumar, Vadym Drozd, Surendra Saxena. A Catalytic Study of the Modified Coal Gasification Process to Produce Clean Hydrogen Gas. CheM. 2012; 2 (1):20-26.
Chicago/Turabian StyleSushant Kumar; Vadym Drozd; Surendra Saxena. 2012. "A Catalytic Study of the Modified Coal Gasification Process to Produce Clean Hydrogen Gas." CheM 2, no. 1: 20-26.
Mg2FeH6 was synthesized by ball milling MgH2 and Fe (2:1 molar ratio) mixture for 72 h followed by heating at 400 °C under H2 pressure. The hydride formation, its structure and homogeneity were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and Raman spectroscopy. High pressure in situ synchrotron X-ray diffraction and Vienna ab initio simulation were used to determine bulk modulus of the sample. The bulk modulus of Mg2FeH6 was found to be 75.4(4) GPa by optimized experiment and 76.3 GPa by theoretical simulation. From high temperature in situ X-ray diffraction study the volumetric thermal expansion coefficient of Mg2FeH6 was found to be αv = 5.85(3) × 10−5 + 7.47(7) × 10−8 (T − To)/°C. Decomposition of Mg2FeH6 was observed at 425 °C and the decomposition products were Mg, Fe and H2.
Lyci George; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies. International Journal of Hydrogen Energy 2009, 34, 3410 -3416.
AMA StyleLyci George, Vadym Drozd, Andriy Durygin, Jiuhua Chen, Surendra K. Saxena. Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies. International Journal of Hydrogen Energy. 2009; 34 (8):3410-3416.
Chicago/Turabian StyleLyci George; Vadym Drozd; Andriy Durygin; Jiuhua Chen; Surendra K. Saxena. 2009. "Bulk modulus and thermal expansion coefficient of mechano-chemically synthesized Mg2FeH6 from high temperature and high pressure studies." International Journal of Hydrogen Energy 34, no. 8: 3410-3416.
Polycrystalline solid solutions Sr1−xKxPbO3−yFy (0 ≤ x, y ≤ 0.20) were synthesized. Their structural properties were determined by X-ray diffraction. Resistivity and thermoelectric power were measured as functions of temperature. It was shown that a simultaneous substitution of potassium for strontium and fluorine for oxygen results in a transformation of conductivity from semiconductive to metallic at low temperatures. The results are discussed in connection with possible superconductivity in new families of doped perovskites.
V.O. Drozd; Alexander M. Gabovich; S.O. Solopan; S.A. Nedil’Ko; M. Pękała; O.G. Dzyaz’Ko. Synthesis and transport properties of solid solutions Sr1−xKxPbO3−yFy (0≤x, y≤0.20). Journal of Alloys and Compounds 2008, 465, 15 -19.
AMA StyleV.O. Drozd, Alexander M. Gabovich, S.O. Solopan, S.A. Nedil’Ko, M. Pękała, O.G. Dzyaz’Ko. Synthesis and transport properties of solid solutions Sr1−xKxPbO3−yFy (0≤x, y≤0.20). Journal of Alloys and Compounds. 2008; 465 (1-2):15-19.
Chicago/Turabian StyleV.O. Drozd; Alexander M. Gabovich; S.O. Solopan; S.A. Nedil’Ko; M. Pękała; O.G. Dzyaz’Ko. 2008. "Synthesis and transport properties of solid solutions Sr1−xKxPbO3−yFy (0≤x, y≤0.20)." Journal of Alloys and Compounds 465, no. 1-2: 15-19.
Hydrogen generating reaction between sodium borohydride, NaBH4, and magnesium hydroxide, Mg(OH)2 (brucite), was studied. Reaction rate was found to depend on the degree of reactants homogenization and/or their particle size. Kinetic of the reaction was studied in isothermal approach in the temperature range of 240–360 °C. It is shown that the reaction obeys 2D diffusion mechanism and its activation energy is 155.9 kJ/mol. Powder XRD analysis and Raman spectroscopy reveal that mechanically activated mixture of NaBH4 and Mg(OH)2 reacts yielding MgO as the only crystalline phase in the temperature range of 240–318 °C. At higher temperatures a new crystalline tetragonal phase of as yet undetermined composition is developed.
Vadym Drozd; Surendra Saxena; Subrahmanyam V. Garimella; Andriy Durygin. Hydrogen release from a mixture of NaBH4 and Mg(OH)2. International Journal of Hydrogen Energy 2007, 32, 3370 -3375.
AMA StyleVadym Drozd, Surendra Saxena, Subrahmanyam V. Garimella, Andriy Durygin. Hydrogen release from a mixture of NaBH4 and Mg(OH)2. International Journal of Hydrogen Energy. 2007; 32 (15):3370-3375.
Chicago/Turabian StyleVadym Drozd; Surendra Saxena; Subrahmanyam V. Garimella; Andriy Durygin. 2007. "Hydrogen release from a mixture of NaBH4 and Mg(OH)2." International Journal of Hydrogen Energy 32, no. 15: 3370-3375.