Nickel Catalysts Supported Over TiO2, SiO2 and ZrO2 for the Steam Reforming of Glycerol

Rossetti, Ilenia; Gallo, Alessandro; Santo, Vladimiro Dal; Bianchi, Claudia L.; Nichele, Valentina; Signoretto, Michela; Finocchio, Elisabetta; Ramis, Gianguido; Michele, Alessandro Di

doi:10.1002/cctc.201200481

Cited by 81 publications

(67 citation statements)

References 65 publications

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“…Higher reduction temperature usually is ascribed to more dispersed Ni and to metal species more strongly interacting with the support. This can be a key point to prevent the formation of C filaments over metal particles [28,[36][37][38].…”

Section: -Textural Structural and Morphological Properties Of The Frmentioning

confidence: 99%

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Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Rossetti

Compagnoni

Finocchio

et al. 2017

Applied Catalysis B: Environmental

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After a preliminary thermodynamic investigation, proper operating conditions have been selected to maximise ethylene productivity by ethanol dehydration and limit side products such as coke and higher olefins or oxygenates. We focused on the possibility to operate with a diluted bioethanol solution (ca. 50 wt%), which represents a promising and convenient raw material, obtainable by simple flash concentration of the fermentation broth. Furthermore, water addition to the ethanol dehydration reactor may help preventing catalyst coking and diethyl ether formation, although affecting the thermodynamic products distribution. A proof of concept for an ethanol dehydration process using diluted ethanol is also provided through process simulation. Catalysts based on a BEA zeolite have been compared, characterised by different acidity imparted by dealumination treatments. Ni addition in variable loading helped suppressing undesired byproducts, difficult to separate from ethylene. For instance, no trace of diethyl ether nor acetaldehyde has been observed for the Ni-loaded samples under optimised working conditions. Catalyst characterisation by FT IR allowed correlating a high selectivity to ethylene with the acid sites nature of the catalyst, whereas the presence of extraframework Lewis acidic sites induced faster coke formation. Durability was finally checked on the most active and selective catalyst evidencing stable operation for 80 h-on-stream and without evidence of coke deposition, as determined after characterisation of the spent samples. A γ-Al2O3 catalyst has been tested as benchmark under the same conditions

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Section: -Textural Structural and Morphological Properties Of The Frmentioning

confidence: 99%

“…This should be beneficial to improve catalyst resistance towards coking as extensively described in the literature [43][44][45].…”

Section: -Textural Structural and Morphological Properties Of The Frmentioning

confidence: 99%

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Rossetti

Compagnoni

Finocchio

et al. 2017

Applied Catalysis B: Environmental

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“…These carbon filaments have several negative influences on the SR process. They may impair the activity of catalysts by covering active sites or causing detachment of active metal Ni from the support [39,51,52]. They may also lead to some operation problems by blocking the reactor.…”

Section: Micro-morphology Of Carbon Depositsmentioning

confidence: 99%

Steam Reforming of Bio-Compounds with Auto-Reduced Nickel Catalyst

Cheng

Dupont

2017

Catalysts

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Abstract:As an extension of chemical looping combustion, chemical looping steam reforming (CLSR) has been developed for H 2 production. During CLSR, a steam reforming (SR) process occurs following the reduction of catalysts by the reforming feedstock itself (termed "auto-reduction"), as opposed to a separate, dedicated reducing agent like H 2 . This paper studied SR performances of four common bio-compounds (ethanol, acetone, furfural, and glucose) with a nickel catalyst that had undergone auto-reduction. A packed bed reactor was used to carry out the experiment of auto-reduction and subsequent SR. The effects of temperature and steam to carbon ratio (S/C) on the carbon conversions of the bio-compounds to gases and yields of gaseous products were investigated. The carbon deposition on spent catalysts was characterized by CHN elemental analysis and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX). The SR performance with the auto-reduced catalyst was close to that with the H 2 -reduced catalyst. In general, an increase in temperature or S/C would lead to an increase in H 2 yields. The dependence of SR performance on temperature or S/C was specific to the type of bio-compounds. Accordingly, the main bottlenecks for SR of each bio-compound were summarized. A large amount of CH 4 existed in the reforming product of ethanol. Severe carbon deposition was observed for SR of acetone at temperatures below 650 • C. A high thermal stability of furfural molecules or its derivatives restricted the SR of furfural. For SR of glucose, the main problem was the severe agglomeration of catalyst particles due to glucose coking.

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“…Materials were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), N2-physisorption, X-ray powder diffraction (XRD), hydrogen temperature programmed reduction (H2-TPR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analyses (TGA), in order to relate their catalytic activity with their physicochemical properties. To date, only a few studies have been published about the use of Ni/SBA-15 in glycerol steam reforming [7,33,34]. These bimetallic materials are novel catalysts for glycerol steam reforming.…”

Section: Introductionmentioning

confidence: 99%

Production of Renewable Hydrogen from Glycerol Steam Reforming over Bimetallic Ni-(Cu,Co,Cr) Catalysts Supported on SBA-15 Silica

et al. 2017

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Glycerol steam reforming (GSR) is a promising alternative to obtain renewable hydrogen and help the economics of the biodiesel industry. Nickel-based catalysts are typically used in reforming reactions. However, the choice of the catalyst greatly influences the process, so the development of bimetallic catalysts is a research topic of relevant interest. In this work, the effect of adding Cu, Co, and Cr to the formulation of Ni/SBA-15 catalysts for hydrogen production by GSR has been studied, looking for an enhancement of its catalytic performance. Bimetallic Ni-M/SBA-15 (M: Co, Cu, Cr) samples were prepared by incipient wetness co-impregnation to reach 15 wt % of Ni and 4 wt % of the second metal. Catalysts were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), N2-physisorption, X-ray powder diffraction (XRD), hydrogen temperature programmed reduction (H2-TPR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analyses (TGA), and tested in GSR at 600 °C and atmospheric pressure. The addition of Cu, Co, and Cr to the Ni/SBA-15 catalyst helped to form smaller crystallites of the Ni phase, this effect being more pronounced in the case of the NiCr/SBA-15 sample. This catalyst also showed a reduction profile shifted towards higher temperatures, indicating stronger metal-support interaction. As a consequence, the Ni-Cr/SBA-15 catalyst exhibited the best performance in GSR in terms of glycerol conversion and hydrogen production. Additionally, Ni-Cr/SBA-15 achieved a drastic reduction in coke formation compared to the Ni/SBA-15 material.

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Nickel Catalysts Supported Over TiO₂, SiO₂ and ZrO₂ for the Steam Reforming of Glycerol

Cited by 81 publications

References 65 publications

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Steam Reforming of Bio-Compounds with Auto-Reduced Nickel Catalyst

Production of Renewable Hydrogen from Glycerol Steam Reforming over Bimetallic Ni-(Cu,Co,Cr) Catalysts Supported on SBA-15 Silica

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