Carbon-supported Fe$z.sbnd;Mn and K$z.sbnd;Fe$z.sbnd;Mn clusters for the synthesis of C2$z.sbnd;C4 olefins from CO and H2 I. Chemisorption and catalytic behavior

Venter, Jeremy J.; Kaminsky, Mark; Geoffroy, Gregory L.; Vannice, M. A.

doi:10.1016/0021-9517(87)90136-9

Cited by 99 publications

(16 citation statements)

References 45 publications

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“…The program facilitated vacuum measurements and data logging. Estimation of the dispersion involved an assumption of one atom of CO molecule adsorbing onto two iron surface atoms (Fe s ), thus the stoichiometric factor used was CO/Fe s –1 = 0.5. ,− The Supporting Information presents the formula for estimating dispersion of the active particle size (eq S1).…”

Section: Methodsmentioning

confidence: 99%

On the Chemistry of Iron Oxide Supported on γ-Alumina and Silica Catalysts

et al. 2018

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Catalysts of iron oxide on γ-alumina and silica which were prepared by an incipient wetness impregnation technique have been investigated in an effort to understand how the surface chemical properties are influenced by the nature of the supports. Surprisingly, this is the first study to compare in depth the influence of the supports on physicochemical parameters such as acidity, site nuclearity, and reducibility. In this study, surface characterisation techniques including N 2 physisorption at −196 °C, ammonia temperature-programmed desorption, inductively coupled plasma optical emission spectrometry, temperature-programmed reduction with hydrogen, CO-chemisorption, scanning electron microscopy, transmission electron microscopy, and NO adsorption by in situ Fourier transform infrared spectroscopy have been performed to understand the different surface reactions occurring over the two different supports. The aim of this study is to ascertain the primary differences between these two catalysts using several catalyst characterization techniques and correlate their chemical and structural differences to their catalytic activity in the conversion of 2-chlorophenol. The results disclose a higher density of acid sites, a smaller particle size of iron oxide, stabilization of Fe(II) aluminate after reduction on the alumina surface, and finally, the formation of isolated iron cations on the surface of alumina which are notably absent on the silica-supported catalyst.

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Section: Methodsmentioning

confidence: 99%

On the Chemistry of Iron Oxide Supported on γ-Alumina and Silica Catalysts

et al. 2018

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“…Manganese modified iron-based catalysts have been widely used to improve the selectivity to light olefins [58][59][60][61][62][63][64]. Incorporation of manganese oxide causes an increase in both activity and chain propagation; if MnO reacts with iron oxides, a spinel structure ((Fe1−xMnx)3O4, x < 1) could be obtained and increases the selectivity to light olefins [65,66]. Wang et al [67] reported that the introduction of manganese to the Fe catalyst (Mn:Fe atomic ratio = 4:96) increased the CO conversion (from 91.8% to 96.3%) and selectivity to C2-C4 olefins (from 26% to 52%), while the CO conversion and selectivity to light olefins decreased following a further increase in the Mn content (Table S2).…”

Section: Fe-based Bimetallic Catalystsmentioning

confidence: 99%

Production of Light Olefins via Fischer-Tropsch Process Using Iron-Based Catalysts: A Review

Gholami

Tišler

et al. 2022

Catalysts

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The production of light olefins, as the critical components in chemical industries, is possible via different technologies. The Fischer–Tropsch to olefin (FTO) process aims to convert syngas to light olefins with high selectivity over a proper catalyst, reduce methane formation, and avoid the production of excess CO2. This review describes the production of light olefins through the FTO process using both unsupported and supported iron-based catalysts. The catalytic properties and performances of both the promoted and bimetallic unsupported catalysts are reviewed. The effect of support and its physico-chemical properties on the catalyst activity are also described. The proper catalyst should have high stability to provide long-term performance without reducing the activity and selectivity towards the desired product. The good dispersion of active metals on the surface, proper porosity, optimized metal-support interaction, a high degree of reducibility, and providing a sufficient active phase for the reaction are important parameters affecting the reaction. The selection of the suitable catalyst with enhanced activity and the optimum process conditions can increase the possibility of the FTO reaction for light-olefins production. The production of light olefins via the FTO process over iron-based catalysts is a promising method, as iron is cheap, shows higher resistance to sulfur, and has a higher WGS activity which can be helpful for the feed gas with a low H2/CO ratio, and also has higher selectivity towards light olefins.

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“…For the supported catalysts, the catalytic activity and selectivity were influenced by the properties of the support materials (such as silica, alumina, and titania), the metal dispersion and loading, and the preparation method. [5,6] Vannice and co-workers [7][8][9][10][11] investigated iron catalysts supported on active carbon and reported a higher activity per unit volume and higher olefin selectivity compared to those of unsupported catalysts. Considering these catalytic benefits and the unique properties of carbon nanotubes (CNTs), such as high thermal conductivity and chemical stability, CNTs can be expected to be a superior catalyst support for the FTS.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐ and Oxygen‐Functionalized Multiwalled Carbon Nanotubes Used as Support in Iron‐Catalyzed, High‐Temperature Fischer–Tropsch Synthesis

et al. 2011

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High‐temperature Fischer–Tropsch synthesis for the production of short‐chain olefins over iron catalysts supported on multiwalled carbon nanotubes (CNTs) was investigated under industrially relevant conditions (340 °C, 25 bar, H2/CO=1) to elucidate the influence of nitrogen and oxygen functionalization of the CNTs on the activity, selectivity, and long‐term stability. Surface functionalization of the CNTs was achieved by means of a gas‐phase treatment using nitric acid vapor at 200 °C for oxygen functionalization (O‐CNTs) and ammonia at 400 °C for the subsequent nitrogen doping (N‐CNTs). Ammonium iron citrate impregnation followed by calcination was applied for the deposition of iron nanoparticles with particle sizes below 9 nm. Subsequent to reduction in pure H2 at 380 °C, the Fe/N‐CNT and Fe/O‐CNT catalysts were applied in Fischer–Tropsch synthesis, in which they showed comparable initial conversion values with an excellent olefin selectivity [S(C3–C6)>85 %] and low chain growth probability (α≤0.5). TEM analysis of the used catalysts detected particle sizes of 23 and 26 nm on O‐CNTs and N‐CNTs, respectively, and Fe5C2 was identified as the major phase by using XRD, with only traces of Fe3O4. After 50 h time on stream under steady‐state conditions, an almost twofold higher activity compared to the Fe/O‐CNT catalysts had been maintained by the Fe/N‐CNT catalysts, which are considered excellent Fischer–Tropsch catalysts for the production of short‐chain olefins owing to their high activity, high selectivity to olefins, low chain growth probability, and superior long‐term stability.

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Carbon-supported Fe$z.sbnd;Mn and K$z.sbnd;Fe$z.sbnd;Mn clusters for the synthesis of C2$z.sbnd;C4 olefins from CO and H2 I. Chemisorption and catalytic behavior

Cited by 99 publications

References 45 publications

On the Chemistry of Iron Oxide Supported on γ-Alumina and Silica Catalysts

On the Chemistry of Iron Oxide Supported on γ-Alumina and Silica Catalysts

Production of Light Olefins via Fischer-Tropsch Process Using Iron-Based Catalysts: A Review

Nitrogen‐ and Oxygen‐Functionalized Multiwalled Carbon Nanotubes Used as Support in Iron‐Catalyzed, High‐Temperature Fischer–Tropsch Synthesis

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