Methane dry reforming over ceria-zirconia supported Ni catalysts

Wolfbeisser, Astrid; Sophiphun, Onsulang; Bernardi, Johannes; Wittayakun, Jatuporn; Föttinger, Karin; Rupprechter, Günther

doi:10.1016/j.cattod.2016.04.025

Cited by 214 publications

(143 citation statements)

References 90 publications

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“…41 It is noteworthy that a small amount of La 2 O 3 can be identified from the XRD pattern at 2θ = 74.8°( 104). This implies that the Ni is well dispersed on the on LSCF and there exists a Ni-LSCF interaction between the Ni and the LSCF support, which is consistent with that reported by Wolfbeisser et al 42 for Ni/CeO-ZrO 2 catalyst. Interestingly, the formation of orthorhombic phase of The morphology of the Ni/LSCF catalyst as captured by the TEM and SEM images and the elemental compositions are represented in Figures 5A to 5C, respectively.…”

Section: Catalyst Characterizationsupporting

confidence: 90%

Experimental and optimization studies of hydrogen production by steam methane reforming over lanthanum strontium cobalt ferrite supported Ni catalyst

et al. 2019

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Summary Over the years, research focused has been on the development of active and stable catalysts for hydrogen (H2) production by steam methane reforming (SMR). However, there is less attention on the individual and interaction effect of key process parameters that influence the catalytic performance of such catalysts and how to optimize them. The main objective of this study is to investigate the individual and interaction effects of key parameters such as methane partial pressure ( PCH4true) (10‐30 kPa), steam partial pressure ( PH2normalO()gtrue) (10‐30 kPa), and reaction temperature (T) (750‐850°C) on H2 yield and methane (CH4) conversion during SMR using Box‐Behnken experimental design (BBD) and response surface methodology. The H2 production was catalyzed using Ni/LSCF prepared by wet impregnation method. The evaluation of the Ni/LSCF using different instrument techniques revealed that the catalyst exhibited excellent physicochemical properties suitable for SMR. Response surface models showing the individual and interaction effect of each of the parameters on the H2 yield and CH4 conversion were obtained using the set of data obtained from the BBD matrix. The three parameters were found to have significant effects on the H2 yield and CH4 conversion. At the highest desirability of 0.8994, maximum H2 yield and CH4 conversion of 89.77% and 89.01%, respectively, were obtained at optimum conditions of 30 kPa, 28.86 kPa, and 850°C for PCH4, PH2normalO()g, and temperature, respectively. The predicted values of the responses from the response surface models were found to be in good agreement with the experimental values. At optimum conditions, the catalyst was found to be stable up to 390 minutes with time on stream. The characterization of the used catalyst using thermogravimetric analysis, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and transmission electron microscopy showed some evidence deposition of a small amount of carbon on the catalyst surface.

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Section: Catalyst Characterizationsupporting

confidence: 90%

Experimental and optimization studies of hydrogen production by steam methane reforming over lanthanum strontium cobalt ferrite supported Ni catalyst

et al. 2019

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“…A further interest in the formation of carbonates on metal oxide surfaces arises from the observation that they are involved in a series of reactions, especially related to CO oxidation and PROX [30], and synthesis gas production [31, 32]. For various reactions and for different oxides, carbonates have been suggested to be intermediates, but also to be spectators or even poisoning active sites.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Reaction of CO on (Pd–)Al2O3 and (Pd–)ZrO2: Vibrational Spectroscopy of Carbonate Formation

et al. 2017

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γ-Alumina is widely used as an oxide support in catalysis, and palladium nanoparticles supported by alumina represent one of the most frequently used dispersed metals. The surface sites of the catalysts are often probed via FTIR spectroscopy upon CO adsorption, which may result in the formation of surface carbonate species. We have examined this process in detail utilizing FTIR to monitor carbonate formation on γ-alumina and zirconia upon exposure to isotopically labelled and unlabelled CO and CO2. The same was carried out for well-defined Pd nanoparticles supported on Al2O3 or ZrO2. A water gas shift reaction of CO with surface hydroxyls was detected, which requires surface defect sites and adjacent OH groups. Furthermore, we have studied the effect of Cl synthesis residues, leading to strongly reduced carbonate formation and changes in the OH region (isolated OH groups were partly replaced or were even absent). To corroborate this finding, samples were deliberately poisoned with Cl to an extent comparable to that of synthesis residues, as confirmed by Auger electron spectroscopy. For catalysts prepared from Cl-containing precursors a new CO band at 2164 cm−1 was observed in the carbonyl region, which was ascribed to Pd interacting with Cl. Finally, the FTIR measurements were complemented by quantification of the amount of carbonates formed via chemisorption, which provides a tool to determine the concentration of reactive defect sites on the alumina surface.

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“…Here only carbonyl bands corresponding to terminal carbonyls with νCO > 2100 cm -1 are observed, while lowfrequency bands corresponding to bridging carbonyls are not detected. The band observed at 2155 cm -1 can be attributed to CO adsorption on the OH groups, or cerium, zirconium, or praseodymium cations, and also to CO complexes with Ni 2+ cations [18,27]. The dependence of the intensity of the band at 2155 cm -1 on the nickel content in the sample is complex which could be explained by the aggregation of NiO on the surface that increases with increased loading.…”

Section: Surface Characteristics Of Adsorbed Co By Ftirmentioning

confidence: 99%

Synthesis, physicochemical and catalytic properties of Ni/PrCeZrO catalysts for water-gas shift reaction

Ларина¹,

Fedorova²,

Krieger³

et al. 2017

Catalysis for Sustainable Energy

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Mixed nanocrystalline ceria-zirconia oxides doped with praseodymium containing 5, 7.5, 10, and 12.5 wt. % nickel were prepared by the incipient wetness impregnation of the oxide support. Complex physicochemical characterization by X-ray diffraction analysis, ultraviolet-visible diffuse reflectance spectroscopy, high resolution transmission electron microscopy and Fourier-transform infrared spectroscopy of adsorbed CO revealed that the nickelcontaining samples are comprised of a solid solution of praseodymium, cerium and zirconium oxides with the fluorite structure as well as nickel oxide particles with a size up to 100 nm. All prepared nanocomposite catalysts show a high catalytic activity in the water-gas shift reaction. The optimum content of nickel in the catalyst providing the maximum activity was found to be 10 wt. %. A high oxygen mobility in these catalysts estimated by the temperature-programmed oxygen isotope heteroexchange with C 18 O 2 provides required coking stability. To eliminate local overheating of the catalyst and decrease the pressure drop in the reactor, as required for further up-scaling, the active component was supported on a metal plate made of Ni-Al foam alloy. At a fixed contact time, the same level of CO conversion with a fraction of the active component was achieved with an approximately 50 wt% loading on the support.

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Methane dry reforming over ceria-zirconia supported Ni catalysts

Cited by 214 publications

References 90 publications

Experimental and optimization studies of hydrogen production by steam methane reforming over lanthanum strontium cobalt ferrite supported Ni catalyst

Experimental and optimization studies of hydrogen production by steam methane reforming over lanthanum strontium cobalt ferrite supported Ni catalyst

Adsorption and Reaction of CO on (Pd–)Al2O3 and (Pd–)ZrO2: Vibrational Spectroscopy of Carbonate Formation

Synthesis, physicochemical and catalytic properties of Ni/PrCeZrO catalysts for water-gas shift reaction

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