Mn–Fe nanoparticles on a reduced graphene oxide catalyst for enhanced olefin production from syngas in a slurry reactor

Nasser, Alhassan; Guo, Lisheng; Elnaggar, Hamada A.; Wang, Yang; Guo, Xiaoyu; Abdelmoneim, Ahmed; Tsubaki, Noritatsu

doi:10.1039/c8ra02193g

Cited by 29 publications

(54 citation statements)

References 63 publications

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“…The WITec Alpha 300R Confocal Raman Microscope equipped with a 532 nm diode laser with an output power of 30 mWwas used to perform Raman spectroscopic analysis of the reacted catalyst. the XRD data show weak diffraction of manganese oxides, which is in good agreement with literatures (Feyzi and Jafari, 2012;Lee et al, 1991;Nasser et al, 2018;Yang et al, 2005). This might be due to Mn was present as amorphous or highly dispersed on the surface of the Al2O3 support (Nasser et al, 2018).…”

Section: Characterisation Of Fresh and Reacted Catalystsupporting

confidence: 91%

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Zhang

et al. 2021

Journal of Hazardous Materials

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Thermo-chemical conversion is a promising technology for the recycle of waste plastics, as it can produce high-value products such as carbon nanotubes (CNTs) and hydrogen. However, the low yield of CNTs is one of the challenges. In this work, the addition of Mn (0 wt.%, 1 wt.%, 5 wt.%, and 10 wt.%) to Fe-based catalyst to improve the production of CNTs has been investigated. Results show that the increase of Mn content from 0 wt.% to 10 wt.% significantly promotes CNTs yield formed on the catalyst from 23.4 wt.% to 32.9 wt.%. The results show that Fe-particles in the fresh catalysts are between 10-25 nm. And the addition of Mn in the Febased catalyst enhanced the metal-support interactions and the dispersion of metal particles, thus leading to the improved catalytic performance in relation to filamentous carbon growth. In addition, the graphitization of CNTs is promoted with the increase of Mn content. Overall, in terms of the quantity and quality of the produced CNTs, 5 wt.% of Mn in Fe-based catalyst shows the best catalytic performance, due to the further increase of Mn content from 5 wt.% to 10 wt.% led to a dramatic decrease of purity by 10 wt.%.

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Section: Characterisation Of Fresh and Reacted Catalystsupporting

confidence: 91%

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Zhang

et al. 2021

Journal of Hazardous Materials

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“…With varying the catalyst material compositions (e. g., active d-block metal, support material and structural and/or chemical promoters) the catalysts behaviour can be modified. [1,7,16,17,[8][9][10][11][12][13][14][15] General requirements for an industrially good FTS reaction catalyst material are: i) sufficient activity towards FTS reaction, ii) high selectivity for converting the input CO only to the desired hydrocarbons and iii) mechanical and catalytical stability. [4] Despite most of the d-block transition metals being somewhat active towards the FTS reaction, [1,18,19] catalysts based on Fe and Co are the most suitable ones for FTS reaction applications.…”

Section: Introductionmentioning

confidence: 99%

“…With varying the catalyst material compositions (e. g., active d‐block metal, support material and structural and/or chemical promoters) the catalysts behaviour can be modified . General requirements for an industrially good FTS reaction catalyst material are: i) sufficient activity towards FTS reaction, ii) high selectivity for converting the input CO only to the desired hydrocarbons and iii) mechanical and catalytical stability .…”

Section: Introductionmentioning

confidence: 99%

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Paalanen

Weckhuysen

2020

ChemCatChem

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Fisher‐Tropsch Synthesis (FTS) is industrially used for converting a carbon‐containing feedstock, such as coal, natural gas, biomass, and municipal waste, via the production of synthesis gas (a mixture of CO+H2) into hydrocarbons. This review article focuses on Fe‐based FTS catalysis, thereby focusing on the process conditions available for steering the various carbon pathways from input CO and their associated reactions. We will also discuss the effects of alkali‐sulphur chemical promotion and the identification of the FTS reaction active Fe carbides, which are assigned with precise crystal structures and nomenclature. Each observed Fe carbide crystal structure is further assigned with corresponding Mössbauer Absorption Spectroscopy (MAS) hyperfine fields. The expected formation temperatures and experimental conditions for the identified Fe carbides encountered in FTS research, namely ϵ‐Fe3C, η‐Fe2C, χ‐Fe5C2, θ‐Fe3C and θ‐Fe7C3, are reviewed.

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“…peaks. [10][11] Moreover, the crystallite size was calculated ~22 nm using the Quantum yield (QY), defined as the ratio of the number of emitted photons to the number of absorbed photons per time unit, is a significant parameter to characterize PL. 13 The QY of the SPION-CDs was estimated to be 2.4%.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Spion-CDs as a Multifunctional Fluorescence/Magnetic Resonance Nanoparticle

et al. 2019

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A multifunctional nanoparticle, Super Paramagnetic Iron Oxide Nanoparticle-Carbon Dots (SPION-CDs), for fluorescence and magnetic resonance imaging is introduced. This nanoparticle possesses the magnetic properties of super-paramagnetic iron oxide (SPION) core as well as the fluorescence characteristics of carbon dots (CDs) coated in mesoporous structure. The SPION-CDs were synthesized using a high temperature facile single-pot hydrothermal method. The products were characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), UV/vis absorption, vibrating sample magnetometer (VSM). The cytotoxic effect of SPION-CDs on OVCAR-3 cells was also evaluated. The synthesized nanoparticle possesses optimal size, low toxicity and excellent magnetic properties, including super-paramagnetic behavior (Ms = 42 emu g−1). Moreover, in the viewpoint of optical properties, the quantum yield of ~2.4% was obtained and the nanoparticle shows good fluorescence stability for cell-labeling studies. This multifunctional nanoparticle with appropriate characterization is a promising candidate for multimodal fluorescence/magnetic resonance imaging platform.

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Mn–Fe nanoparticles on a reduced graphene oxide catalyst for enhanced olefin production from syngas in a slurry reactor

Abstract: Mn acted as a promoter by forming a Mn-rich layer around a core rich in Fe. The outer layer hindered the formation of magnetite, and impeded H2 adsorption whilst encouraging CO dissociative adsorption, which gave the perfect conditions for olefin production.

Cited by 29 publications

References 63 publications

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Waste plastics recycling for producing high-value carbon nanotubes: Investigation of the influence of Manganese content in Fe-based catalysts

Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis

Preparation and Characterization of Spion-CDs as a Multifunctional Fluorescence/Magnetic Resonance Nanoparticle

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