Methane Bi-reforming for direct ethanol production over smart Cu/Mn- ferrite catalysts

El‐Hafiz, Dalia R. Abd; Sakr, Ayat A.-E.; Ebiad, Mohamed A.

doi:10.1016/j.renene.2020.11.078

Cited by 17 publications

(11 citation statements)

References 68 publications

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“…447 Some hightemperature reactions using Cu−Fe and Cu−Mn catalyst and CO 2 as a soft oxidant were also found to yield ethanol. 448 However, the mentioned processes either required temperature or electricity input and rely on expensive catalytic systems with low product yield. Photocatalytic conversion of CH 4 to oxygenates might be a solution; however, uncontrolled oxidation from generated •OH radicals leads to deep mineralization reducing the overall carbon efficiency.…”

Section: Photoactive Sacs For Ch 4 Ormentioning

confidence: 99%

“…Electrocatalytic approach using Ni/NiO has also been applied to reach maximum Faradaic efficiency of 89% and ethanol yield of 25 μmol g NiO –1 h –1 at 1.40 V vs RHE . Some high-temperature reactions using Cu–Fe and Cu–Mn catalyst and CO 2 as a soft oxidant were also found to yield ethanol . However, the mentioned processes either required temperature or electricity input and rely on expensive catalytic systems with low product yield.…”

Section: Photoactive Sacs For Ch4ormentioning

confidence: 99%

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Single Atom Catalysts for Selective Methane Oxidation to Oxygenates

Kumar

Al‐Attas

et al. 2022

ACS Nano

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Direct conversion of methane (CH 4 ) to C 1−2 liquid oxygenates is a captivating approach to lock carbons in transportable value-added chemicals, while reducing global warming. Existing approaches utilizing the transformation of CH 4 to liquid fuel via tandemized steam methane reforming and the Fischer−Tropsch synthesis are energy and capital intensive. Chemocatalytic partial oxidation of methane remains challenging due to the negligible electron affinity, poor C−H bond polarizability, and high activation energy barrier. Transition-metal and stoichiometric catalysts utilizing harsh oxidants and reaction conditions perform poorly with randomized product distribution. Paradoxically, the catalysts which are active enough to break C−H also promote overoxidation, resulting in CO 2 generation and reduced carbon balance. Developing catalysts which can break C−H bonds of methane to selectively make useful chemicals at mild conditions is vital to commercialization. Single atom catalysts (SACs) with specifically coordinated metal centers on active support have displayed intrigued reactivity and selectivity for methane oxidation. SACs can significantly reduce the activation energy due to induced electrostatic polarization of the C−H bond to facilitate the accelerated reaction rate at the low reaction temperature. The distinct metal−support interaction can stabilize the intermediate and prevent the overoxidation of the reaction products. The present review accounts for recent progress in the field of SACs for the selective oxidation of CH 4 to C 1−2 oxygenates. The chemical nature of catalytic sites, effects of metal−support interaction, and stabilization of intermediate species on catalysts to minimize overoxidation are thoroughly discussed with a forward-looking perspective to improve the catalytic performance.

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Section: Photoactive Sacs For Ch 4 Ormentioning

confidence: 99%

Section: Photoactive Sacs For Ch4ormentioning

confidence: 99%

Single Atom Catalysts for Selective Methane Oxidation to Oxygenates

Kumar

Al‐Attas

et al. 2022

ACS Nano

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“…In the second step, the reduced OC is reoxidized by reacting with the oxidizing agent (steam, air, O 2 ). For example, CLR of methane using steam as an oxidizing agent yields syngas and pure H 2 in reduction and oxidation steps, respectively, as shown by eqs and . CL-SR is operated in both fluidized bed and packed bed reactor.…”

Section: Chemical Looping-steam Reforming (Cl-sr)mentioning

confidence: 99%

“…For example, CLR of methane using steam as an oxidizing agent yields syngas and pure H 2 in reduction and oxidation steps, respectively, as shown by eqs 3 and 4. 4 CL-SR is operated in both fluidized bed and packed bed reactor. In fluidized bed reactor, OC is circulated between the two reactors as shown in Figure 1.…”

Section: Chemical Looping-steam Reforming (Cl-sr)mentioning

confidence: 99%

Recent Insights into the Production of Syngas and Hydrogen Using Chemical Looping-Steam Reforming (CL-SR)

Sayyed

Vaidya

2022

Ind. Eng. Chem. Res.

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Chemical looping-steam reforming (CL-SR) is a prospective technology for the simultaneous production of syngas and hydrogen (H2). The quality of syngas and hydrogen (H2) obtained from CL-SR process has garnered the interest of the scientific society. A recyclable oxygen storage material (oxygen carrier) is reacted through an alternating cycle of fuel (reduction step) and steam (oxidation step) at higher temperatures. Oxygen carrier (OC) plays a vital role in directing the path of the reaction in the CL-SR process. Hence, developing and selecting a proper OC is crucial. The current study intends to address recent breakthroughs in the development and performance of OCs subjected to different reacting fuel species such as methane (CL-SMR), CO2 (CL-HG), and liquid fuels. The performance of various classes of OCs such as metal oxide, mixed metal oxides, and perovskites toward conversion and lattice oxygen selectivity is investigated. The thermodynamic study and constraints related to the performance of OCs in CL-SR are discussed along with the economic evaluation of the CL-SR process and the conventional SMR process. Further, the theoretical approaches involved in determining the kinetics of the CL-SR process and kinetic models developed by the researchers are reviewed. Finally, the scientific barriers and the suggestions for optimized operation of the CL-SR process are listed.

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“…Like multi-component lithium ferrites, Ni-Zn ferrites are the basis for obtaining microwave ceramic products for civil and military applications [10][11][12]. Furthermore, it has been discovered that nanostructured ferrite powders are capable of acting as efficient catalysts [13,14] and photocatalysts (due to their crystalline structure, able to absorb visible light and conduct oxidation processes) [15][16][17] and antimicrobial materials [18,19]; they are also used for the purification of natural water sources along with wastewater from various pollutants (utilizing photocatalysis and absorption) [20,21]. In recent years, they have been used in the water purification field and seem to be promising future materials for this particular application as adsorbents of metal ions (e.g., Ag, Hg, Cd, Co, Cr, Cu, Ni, Mn, Mo, Pb, Sn, and Zn), dyes, pesticides and insecticides, pharmaceuticals (separately or in a combination with other materials, e.g., chitosan), and other refractory organic pollutants [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, and Antimicrobial Performance of NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) Magnetic Powders toward E. coli, B. cereus, S. citreus, and C. tropicalis

Martinson

Beliaeva

Sakhno

et al. 2022

Water

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The active development of water purification functional materials based on multicomponent spinel ferrites makes it necessary to search for new efficient methods of obtaining initial nanostructured powders. In this study, a two-stage method for the synthesis of perspective pollutant absorption agents based on NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) spinel ferrites are proposed and implemented. The approach is based on the synthesis of the initial powder using the solution combustion method and its subsequent thermal treatment in the air. It was found that synthesized samples are single-phase Ni-Zn ferrites with an average crystallite size of 41.4 to 35.7 nm and a degree of crystallinity of ~95–96%. The analysis of antimicrobial activity against four diverse test-cultures: Escherichia coli ATCC 11229 (non-spore-forming gram-negative), Bacillus cereus ATCC 10702 (spore-forming gram-positive), Staphylococcus citreus NCTC 9379 (non-spore-forming gram-positive), and Candida tropicalis ATCC 750 (yeast) showed that almost all of the synthesized powders exhibit an advanced ability to inhibit the growth of the microorganisms mentioned above. The compositions obtained can be a perspective basis for both natural and wastewater purificators with magnetic separation ability and can find biotechnological and biomedical applications as promising antimicrobial materials.

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Methane Bi-reforming for direct ethanol production over smart Cu/Mn- ferrite catalysts

Cited by 17 publications

References 68 publications

Single Atom Catalysts for Selective Methane Oxidation to Oxygenates

Single Atom Catalysts for Selective Methane Oxidation to Oxygenates

Recent Insights into the Production of Syngas and Hydrogen Using Chemical Looping-Steam Reforming (CL-SR)

Synthesis, Structure, and Antimicrobial Performance of NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) Magnetic Powders toward E. coli, B. cereus, S. citreus, and C. tropicalis

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