Spinel-type MnxCr3-xO4-based catalysts for ethanol steam reforming

Smal, Ekaterina; Simonov, Mikhail; Mezentseva, Natalia; Krieger, Tamara; Ларина, Т. В.; Saraev, Аndrey А.; Glazneva, Tatiana S.; Ищенко, А. В.; Rogov, Vladimir A.; Eremeev, Nikita; Sadovskaya, E. M.; Sadykov, Vladіslav

doi:10.1016/j.apcatb.2020.119656

Cited by 18 publications

(23 citation statements)

References 50 publications

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“…Ester polymeric precursors (Pechini) method [88] is based upon using citric acid and ethylene diamine as chelating agents. With ethylene glycol solution single-phase nanocrystalline doped cerium-zirconium oxides [13,18,89], perovskites [31,32,34,35] and spinel oxides [69] were obtained possessing a high spatial uniformity of cations distribution. In the case of aqueous solutions such spatial uniformity was not obtained [62][63][64][65].…”

Section: Pechini Methodsmentioning

confidence: 99%

“…Oxides with a spinel structure based on MnCr2O4 prepared by Pechini method [69,90] have 2-40% of admixture phase with corundum structure due to segregation of (Mn,Cr)2O3 oxide during annealing in air. Doping with Fe and Zn cations as well as supporting Ru + Ni decrease the content of this admixture due to spinel structure stabilization.…”

Section: Structural Featuresmentioning

confidence: 99%

“…use mixed oxides of rare earth and transition metals with variable oxidation states of cations/oxygen stoichiometry. As the result, such oxides with fluorite [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], perovskite and spinel [68][69][70][71][72][73][74][75][76] structures as well as their nanocomposites [35,72,73] have sufficient amount of reactive surface/bulk oxygen species characterized also by a high mobility providing their fast migration to metal particles, where they react with activated fuel molecules, thus preventing coking [71][72][73]. These oxides are the most promising supports for catalysts of hydrocarbons or oxygenates reforming to syngas without coking .…”

Section: Introductionmentioning

confidence: 99%

“…The most important new aspect of this review is detailed description of oxygen mobility in catalysts of fuels transformation into syngas comprised of mixed oxides with fluorite, perovskite and spinel structures promoted with Ni and Pt-group metals. It is based on application of unique techniques of oxygen isotope heteroexchange of these catalysts with 18 O2 or C 18 O2 in the gas phase in flow installations including experiments in the temperature-programmed mode as well as in the steady-state of catalytic reactions (Steady-State Isotope Transients Kinetic Analysis, SSITKA) [18,35,68,69,71,72,87]. Even though it is well known that a high oxygen mobility and reactivity in these catalysts allows to prevent coking in the reactions of biofuels transformation into syngas by a fast transfer of oxygen species to the metal-support interface, where they interact with activated fuels fragments transforming them into syngas, only in our works such strict characteristics of oxygen mobility as oxygen self-diffusion coefficients were systematically estimated using sophisticated software for isotope exchange kinetics data analysis.…”

Section: Introductionmentioning

confidence: 99%

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Modern Trends in Design of Catalysts for Transformation of Biofuels into Syngas and Hydrogen: From Fundamental Bases to Performance in Real Feeds

et al. 2021

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This review considers problems related to design of efficient structured catalysts for natural gas and biofuels transformation into syngas. Their active components are comprised of fluorite, perovskite and spinel oxides or their nanocomposites (both bulk and supported on high surface area Mg-doped alumina or MgAl2O4) promoted by platinum group metals, nickel and their alloys. A complex of modern structural, spectroscopic and kinetic methods was applied to elucidate atomic-scale factors controlling their performance and stability to coking, such as dispersion of metals/alloys, strong metal-support interaction and oxygen mobility/reactivity as dependent upon their composition and synthesis procedures. Monolithic catalysts comprised of optimized active components loaded on structured substrates with a high thermal conductivity demonstrated high activity and stability to coking in processes of natural gas and biofuels reforming into syngas. A pilot-scale axial reactor equipped with the internal heat exchanger and such catalysts allowed to efficiently convert into syngas the mixture of natural gas, air and liquid biofuels in the autothermal reforming mode at low (~50–100 °C) inlet temperatures and GHSV up to 40,000 h−1.

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Section: Pechini Methodsmentioning

confidence: 99%

Section: Structural Featuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modern Trends in Design of Catalysts for Transformation of Biofuels into Syngas and Hydrogen: From Fundamental Bases to Performance in Real Feeds

et al. 2021

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“…The primary reason for catalyst deactivation was the carbonaceous deposition. Spinel-type mixed manganese-chromium oxides MnxCr 3-x O 4 , prepared by Pechini route have been used as support for the co-deposition of Ni and Ru; the strong metal-support interaction stabilized small clusters of metals/alloys, preventing carbon nucleation in ESR [53].…”

Section: Ethanol Steam Reformingmentioning

confidence: 99%

Main Hydrogen Production Processes: An Overview

et al. 2021

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Due to its characteristics, hydrogen is considered the energy carrier of the future. Its use as a fuel generates reduced pollution, as if burned it almost exclusively produces water vapor. Hydrogen can be produced from numerous sources, both of fossil and renewable origin, and with as many production processes, which can use renewable or non-renewable energy sources. To achieve carbon neutrality, the sources must necessarily be renewable, and the production processes themselves must use renewable energy sources. In this review article the main characteristics of the most used hydrogen production methods are summarized, mainly focusing on renewable feedstocks, furthermore a series of relevant articles published in the last year, are reviewed. The production methods are grouped according to the type of energy they use; and at the end of each section the strengths and limitations of the processes are highlighted. The conclusions compare the main characteristics of the production processes studied and contextualize their possible use.

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Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

El‐Salamony

2023

ChemistrySelect

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Hydrogen is regarded as one of the most promising renewable energy that carriers with a high heating value for replacing fossil fuels and meeting clean energy requirements. Steam reforming has shown considerable promises in the creation of hydrogen. Many studies on catalytic steam reforming of ethanol have been published. Hence, developing efficient and stable catalysts capable of producing large H2 yields and ethanol conversion is a crucial step. Nickel is an essential industrial catalyst because it enhances hydrogenation and dehydrogenation reactions by promoting the scission of C−C bonds. Many studies have been conducted by employing noble metal‐based catalysts to reduce coke deposition and enhance metal stability against sintering since they are known to successfully break the C−C bond, resulting in less carbonaceous deposits and hence more stable catalysts. To avoid carbon production, alkaline promoters, and bimetallic heterogeneous catalysts are commonly utilized in catalysis. However, because huge amounts of by‐product CO2 produced by SRE courses are usually regarded as the primary cause of hydrogen purity degradation, it is recommended to remove CO2 in‐situ to achieve high hydrogen production.

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Spinel-type MnxCr3-xO4-based catalysts for ethanol steam reforming

Cited by 18 publications

References 50 publications

Modern Trends in Design of Catalysts for Transformation of Biofuels into Syngas and Hydrogen: From Fundamental Bases to Performance in Real Feeds

Modern Trends in Design of Catalysts for Transformation of Biofuels into Syngas and Hydrogen: From Fundamental Bases to Performance in Real Feeds

Main Hydrogen Production Processes: An Overview

Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

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