The formation of magnetic ferric oxides in soils over underground gas storage reservoirs

Mozharova, N. V.; Pronina, V. V.; Ivanov, A. V.; Шоба, С. А.; Zagurskii, A. M.

doi:10.1134/s1064229307060051

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The synthesis of magnetic oxides of iron in soils occurs during an alternation of processes of the humidifying/ drying up, corresponding to the anaerobic and the aerobic periods, variable Eh on microlocuses, with the participation of organic substances. The mechanism of this process is described in the paper (Mozharova et al 2007). …”

Section: Resultsmentioning

confidence: 99%

Specificity of soil functioning and formation on gas-bearing areas

Mozharova

Kulachkova

2008

J Soils Sediments

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Section: Resultsmentioning

confidence: 99%

Specificity of soil functioning and formation on gas-bearing areas

Mozharova

Kulachkova

2008

J Soils Sediments

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“…Metal oxides have a broad range of uses including catalysts, gas sensors, − and gas storage. − Nanomanganese oxide, mesoporus nickel, and magnesium oxide have been studied for hydrogen storage. Group 4 metal oxides are well established for the generation of hydrogen in a photoelectrochemical cell, − and play an important role in gas absorption and hydrogen storage. − Thus, it is important to understand the interactions between hydrogen and group 4 metal oxides to determine their potential capability for hydrogen storage.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Molecular Hydrogen Adsorption over Small (MO₂)_n Nanoclusters (M = Ti, Zr, Hf; n = 1 to 4)

et al. 2018

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Hydrogen adsorption on small group 4 metal oxide clusters for both the singlet and the first excited triplet states have been investigated by density functional theory and correlated molecular orbital theory at the coupled cluster CCSD(T) level. The reaction starts with hydrogen physisorption on a metal center followed by formation of metal hydride/hydroxides due to splitting H into H and H. The hydrogen physisorption energies are predicted to be -1 to -8 kcal/mol for the singlet and -1 to -26 kcal/mol for the triplet, respectively. The formation of metal hydride/hydroxides does not involve redox processes. Chemisorption leading to formation of metal hydride/hydroxides is exothermic by -10 to -50 kcal/mol for the singlet, and exothermic by up to -60 kcal/mol for the triplet. The predicted energy barriers are less than 20 kcal/mol. Formation of metal dihydroxides from the metal hydride/hydroxides is generally endothermic for the monomer and dimer and is exothermic for the trimer and tetramer. Formation of the dihydroxide is a proton coupled electron transfer (PCET) process. The singlet energy barriers for the H→ H transfer process are predicted to be 35-60 kcal/mol, in comparison to triplet energy barriers of less than 15 kcal/mol for the H → H transfer process. For trimers and tetramers, there exist two different pathways: the first is a direct pathway with PCET to a terminal oxygen and the second is a two-step pathway with initial formation of a bridge OH group followed by a proton transfer to generate a terminal OH group. For the singlet, the two-step pathway is preferred for M = Ti and the direct pathway is more favorable for M = Zr and Hf. The two-step pathway is always preferred for the triplet as one-electron transfer is always more likely than two-electron transfer in the direct pathway.

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“…Metal oxides still attract attention for adsorption due to their wide application in catalysis, − gas storage, − and sensors. − However, with respect to the usage in physisorption of hydrogen, few research outcomes have been reported, , since there remains the difficult task of synthesizing highly porous metal oxides with unsaturated metal centers, which account for the strong interaction with hydrogen. − Nickel oxides and magnesium oxides are polar materials with an intrinsic dipole moment. The externally applied electric field could further enhance the dipole moment so that the hydrogen could be more strongly adsorbed.…”

Section: Introductionmentioning

confidence: 99%

“…Metal oxides still attract attention for adsorption due to their wide application in catalysis, [41][42][43][44][45][46][47][48][49] gas storage, [50][51][52] and sensors. [53][54][55][56] However, with respect to the usage in physisorption of hydrogen, few research outcomes have been reported, 57,58 since there remains the difficult task of synthesizing highly porous metal oxides with unsaturated metal centers, which account for the strong interaction with hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Storage in Mesoporous Metal Oxides with Catalyst and External Electric Field

2010

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The effects of catalyst and external electric field on hydrogen storage were evaluated for mesoporous nickel oxide and magnesium oxide. When Pt was introduced into the metal oxides, the capacity of hydrogen adsorption increased remarkably. Furthermore, the measurements of hydrogen adsorption were also carried out on metal oxides by using piezoelectric materials PMN-PT to generate the external electric field. It was observed that the external electric field can increase hydrogen uptake by 37.5% for nickel oxide and 25% for magnesium oxide in a pressure range from 0 to 60 bar. Our DFT calculations support this electrical field enhancement.

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The formation of magnetic ferric oxides in soils over underground gas storage reservoirs

Cited by 7 publications

References 7 publications

Specificity of soil functioning and formation on gas-bearing areas

Specificity of soil functioning and formation on gas-bearing areas

Computational Study of Molecular Hydrogen Adsorption over Small (MO₂)_n Nanoclusters (M = Ti, Zr, Hf; n = 1 to 4)

Hydrogen Storage in Mesoporous Metal Oxides with Catalyst and External Electric Field

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The formation of magnetic ferric oxides in soils over underground gas storage reservoirs

Cited by 7 publications

References 7 publications

Specificity of soil functioning and formation on gas-bearing areas

Specificity of soil functioning and formation on gas-bearing areas

Computational Study of Molecular Hydrogen Adsorption over Small (MO2)n Nanoclusters (M = Ti, Zr, Hf; n = 1 to 4)

Hydrogen Storage in Mesoporous Metal Oxides with Catalyst and External Electric Field

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Computational Study of Molecular Hydrogen Adsorption over Small (MO₂)_n Nanoclusters (M = Ti, Zr, Hf; n = 1 to 4)