The synergistic effect between supercritical water and redox properties of iron oxide nanoparticles during in-situ catalytic upgrading of heavy oil with formic acid. Isotopic study

Hosseinpour, Morteza; Fatemi, Shohreh; Ahmadi, Seyed Javad; Morimoto, Masato; Akizuki, Makoto; Oshima, Yoshito; Fumoto, Eri

doi:10.1016/j.apcatb.2018.02.030

Cited by 57 publications

(17 citation statements)

References 42 publications

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“…As noted by Khalil et al, 22 upon the oxidation of thiophene by lattice oxygen from hematite, the latter is transformed into magnetite; however, due to interaction with water, magnetite again is transformed into hematite. A similar conclusion was made by Hosseinpour et al 42 based on the research results of the SCW conversion of heavy oil in the presence of iron oxide nanoparticles. Even though in the present work, the inner surface of the reactor was annealed in an atmosphere of O 2 (see Section 4) to obtain the oxide layer before each test, the formation of Fe x O y could also be caused by the oxidation of iron with water 43 or a water− oxygen mixture.…”

Section: Resultssupporting

confidence: 84%

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

2021

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The article presents the results of a study of thiophene oxidation in highdensity C 4 H 4 S/O 2 mixtures (ρ Thi = 0.12 and 0.15 mol/dm 3 , ρ O2 = 0.74−1.26 mol/dm 3 ), diluted with water vapor and argon (dilution level x D = 35−65% mol), at uniform heating (1 K/min) of a stainless-steel tubular reactor up to 823 K. It is established that the temperature of thiophene oxidation onset weakly depends on the nature of the diluent and the oxygen content in the reaction mixture. From the time dependences of the reaction mixtures on temperature and pressure, it follows that the oxidation of thiophene in the water vapor and argon media proceeds according to the mechanisms of homogeneous and heterogeneous reactions. Upon oxidation of thiophene in the stoichiometric mixtures in argon with a small amount of water vapor, as well as in the lean mixtures in water vapor, the contribution of reactions on the surface of the Pt−Rh/Pt thermocouple, inserted into the center of the reaction volume, is increased. Upon oxidation of thiophene in water vapor in the fuelenriched and stoichiometric mixtures, reactions on the oxidized surface of the reactor wall (primarily iron oxides) prevail. Increasing the density of water vapor both reduces the contribution of heterogeneous reactions on the reactor wall and prevents complete carbon burnout. It is shown that the neutralization of sulfuric acid, resulting from the oxidation of thiophene, with calcium carbonate reduces the corrosion of stainless steel. The X-ray diffraction analysis revealed the presence of ferrochromite, iron and chromium oxides, iron, nickel, and chromium sulfates in the corrosion products.

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Section: Resultssupporting

confidence: 84%

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

2021

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“…In-situ H 2 gas production can also take place through redox reactions. For example, water-gas shift reaction (CO + H 2 O ⇌ CO 2 + H 2 ) may occur within the HDO process to supply hydrogen [14].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen donation of bio-acids over transition metal facets: A density functional theory study

Zhang

Osatiashtiani

et al. 2019

Applied Catalysis A: General

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Highlights • Hydrogen donation in catalytic decomposition of bio-acids and H 2 was investigated. • Ten transition metals were tested for bio-acid adsorption. • Electron density difference was analysed to elucidate interface interaction. • Mo showed good effects in facilitating the decomposition of bio-acids. • AcOH had good potential as an alternative hydrogen donor compound over Mo (110).

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“…It can stimulate and inhibit the central nervous system and various nerve endings in humans. The degradation of 4-nitrophenol has been used as a general test for evaluating the catalytic performance of NPs because its degradation can be easily measured by UV-Vis spectroscopy [94,95]. Zhang et al used the marine bacterium Bacillus sp.…”

Section: Degradation Of 4-nitrophenolmentioning

confidence: 99%

Microorganism Assisted Synthesized Nanoparticles for Catalytic Applications

et al. 2019

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Metal and metalloid nanoparticles (NPs) have attracted substantial attention from research communities over the past few decades. Traditional methodologies for NP fabrication have also been intensely explored. However, drawbacks such as the use of toxic agents and the high energy consumption involved in chemical and physical processes hinder their further application in various fields. It is well known that some bacteria are capable of binding and concentrating dissolved metal and metalloid ions, thereby detoxifying their environments. Bioinspired fabrication of NPs is environmentally friendly and inexpensive and requires only low energy consumption. Some biosynthesized NPs are usually used as heterogeneous catalysts in environmental remediation and show higher catalytic efficiency because of their enhanced biocompatibility, stability and large specific surface areas. Therefore, bacteria used as nanofactories can provide a novel approach for removing metal or metalloid ions and fabricating materials with unique properties. Even though a wide range of NPs have been biosynthesized, and their synthetic mechanisms have been proposed, some of these mechanisms are not known in detail. This review focuses on the synthesis and catalytic applications of NPs obtained using bacteria. The known mechanisms of bioreduction and prospects in the design of NPs for catalytic applications are also discussed.

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The synergistic effect between supercritical water and redox properties of iron oxide nanoparticles during in-situ catalytic upgrading of heavy oil with formic acid. Isotopic study

Cited by 57 publications

References 42 publications

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

Hydrogen donation of bio-acids over transition metal facets: A density functional theory study

Microorganism Assisted Synthesized Nanoparticles for Catalytic Applications

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