Methane conversion on Pt–Ru nanoparticles alloy supported on hydrothermal carbon

Matos, Juan; Rosales, Maibelín; Demir‐Cakan, Rezan; Titirici, Maria‐Magdalena

doi:10.1016/j.apcata.2010.07.047

Cited by 25 publications

(11 citation statements)

References 23 publications

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“…On the contrary, the two C-containing composites showed a better stability along reaction, and for the C/ZnO/Zn sample, almost 100% BB41 photodegradation was observed after only 3 h irradiation. The higher photoactivity and stability of this sample is ascribed to the protector effect of carbon [32,33] from the lixiviation phenomena, due to carbon-based materials maintain a reductive chemical environment, inhibiting the lixiviation of Zn-containing nanoparticles by the oxidative acid attack.…”

Section: Photocatalytic Testsmentioning

confidence: 97%

“…The inhibition process of lixiviation of ZnO under UV-visible irradiation has been reported for carbon-based materials [18,27,28] and carbon quantum dots as dopants [31]. In major part, this effect occurs due to the high reduction potential of carbon materials [32][33][34][35], which allows an efficient electron-donor transference from the graphene-based layers to the semiconductor, protecting them from thermo-or photo-oxidation processes, even at strong oxidation conditions such as UV irradiation and high temperature. The particle size, morphology, surface area, crystalline framework, and composition are responsible of the optoelectronic properties of ZnO [18][19][20][21][27][28][29][30][31] including the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

et al. 2019

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Innovative composites based on an amorphous-carbon matrix containing a second phase ZnO oxide and/or highly dispersed Zn metallic were synthesized via a modified Pechini route, in which a partial pyrolysis method was reached. Studies of adsorption in the dark and the photocatalytic activity for the cationic azo-dye, basic blue 41, and degradation were carried out. X-ray diffraction patterns for the carbon matrix and its composite with Zn show characteristics of the amorphous carbon. The infrared in the mid region of the composite prepared with ZnO and Zn exhibit vibrational bands related to bonds zinc oxide. The surface pH of the material is the main factor responsible for the adsorption of the azo-dye, but the contribution of mesopores favored the diffusion of molecules from the bulk of solution to the pore framework. Esters-like functional groups on the surface of carbons hinder the adsorption of the azo-dye. When Zn is embedded within amorphous carbon the photocatalytic activity of the composites showed up to 2.4 higher than neat ZnO. The enhancement in the photocatalytic activity and stability of C/ZnO/Zn and C/Zn composites is discussed in terms of a protector effect by the carbon layers inserted in composites. Carbon layers are responsible to inhibit the lixiviation of ZnO particles along irradiation.

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Section: Photocatalytic Testsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

et al. 2019

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“…Thus, e.g., carbon materials interact less with the precursor oxidic phases, allowing a more complete formation of the active sulfides when employing conventional active phases. [32][33][34][35][36] Therefore, the synthesis of hybrid metal oxide/carbon materials bearing supported metal oxide nanoparticles highly dispersed on the carbonaceous support remains an interesting route for the preparation of novel catalysts [37][38][39][40] with a superior performance in hydroprocessing, particularly in deep hydrodesulphurisation.…”

Section: Introductionmentioning

confidence: 99%

Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

et al. 2013

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Novel MoO(2)/C nano/microcomposites were prepared via a bottom-up approach by hydrothermal carbonization of a solution of glucose as a carbon precursor in the presence of polyoxometalates (POMs: phosphomolybdic acid [H(3)PMo(12)O(40)] and ammonium heptamolybdate tetrahydrate [(NH(4))(6)Mo(7)O(24)]·4H(2)O). The structural characterization by FT-IR, XRPD, SEM and TEM analyses revealed the controlled formation of hierarchical MoO(2)/C composites with different morphologies: strawberry-like, based on carbon microspheres decorated with MoO(2) nanoparticles; MoO(2)/C core-shell composites; and irregular aggregates in combination with ring-like microstructures bearing amorphous Mo species. These composites can be fine-tuned by varying reaction time, glucose/POM ratio and type of POM precursor. Subsequent transformations in the solid state through calcinations of MoO(2)/C core-shell composites in air lead to hollow nanostructured molybdenum trioxide microspheres together with nanorods and plate microcrystals or cauliflower-like composites (MoO(2)/C). In addition, the MoO(2)/C composite undergoes a morphology evolution to urchin-like composites when it is calcined under nitrogen atmosphere (MoO(2)/C-N(2)). The MoO(2)/C strawberry-like and MoO(2)/C-N(2) composites were transformed into Mo carbide and nitride supported on carbon microspheres (Mo(2)C/C, MoN/C, and MoN/C-N(2)). These phases were tested as precursors in thiophene hydrodesulphurization (HDS) at 400 °C, observing the following trend in relation to the thiophene steady-state conversion: MoN/C-N(2)> MoN/C > Mo(2)C/C > MoO(2)/C-N(2) > MoO(2)/C. According to these conversion values, a direct correlation was observed between higher HDS activity and decreasing crystal size as estimated from the Scherrer equation. These results suggest that such composites represent interesting and promising precursors for HDS catalysts, where the activity and stability can be modified either by chemical or structural changes of the composites under different conditions.

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“…Numerous scientific papers [23][24][25][26][27][28][29][30][31] report that transition metals of the VIII group, except for osmium, especially Ni, Co, Pd, Ir, and Pt, are active in the DRM reaction. Because of the high cost of noble metals and its deficit, to prepare the catalysts is mainly used nickel and cobalt.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cobalt Oxide Content on the Activity of NiO-Co2O3/γ-Al2O3 Catalyst in the Reaction of Dry Reforming of Methane to Synthesis Gas

Myltykbayeva

Ергазиева

Telbayeva

et al. 2020

Eurasian Chem. Tech. J.

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The effect of cobalt oxide content on the activity of NiO-Co2O3/γ-Al2O3 catalyst was investigated in process of dry reforming of methane (DRM) to synthesis gas. It was found that among the studied catalysts the highest activity is shown by the NiO-Co2O3/ γ-Al2O3, where methane conversion is 89%. It was determined by the scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) there are oxides of Ni and Co in the form of nanosized particles on active NiO-Co2O3/γ-Al2O3 catalyst and Co-Ni alloys, formed after the reaction of DRM, the size of 17‒23 nm. Thermogravimetric Analysis (TGA)/ Differential Thermal Analysis (DTA)/ Differential Scanning Calorimetry (DSC) of catalyst showed that the highest weight loss (2.7%) is observed at a degree from 30 to 260 °C after DRM. After heating above 300 °C there is a slight increase in weight, accompanied by an exothermic effect on the DSC curve due to the gas adsorption used to purge the unit. The data indicate the absence of coke formation on NiO-Co2O3/γ-Al2O3 surface. According to TPR-H2 there are peaks at relatively low temperatures of Т1mах = 205 °C and Т2mах = 497 °C on thermally programmed reduction (TPR) TPR-Н2 spectrum of NiO-Со2О3/γ-Al2O3, which are associated with the formation of easily reducible cobalt and nickel oxides, indicating the presence of active and mobile oxygen in the catalyst. These results confirm that the activity of NiO-Co2O3/γ-Al2O3 is due to the formation of nanophases, the presence of active oxygen, and the absence of coke on the catalyst surface.

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Methane conversion on Pt–Ru nanoparticles alloy supported on hydrothermal carbon

Cited by 25 publications

References 23 publications

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

Effect of Cobalt Oxide Content on the Activity of NiO-Co2O3/γ-Al2O3 Catalyst in the Reaction of Dry Reforming of Methane to Synthesis Gas

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Methane conversion on Pt–Ru nanoparticles alloy supported on hydrothermal carbon

Cited by 25 publications

References 23 publications

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

Novel MoO2/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity

Effect of Cobalt Oxide Content on the Activity of NiO-Co2O3/γ-Al2O3 Catalyst in the Reaction of Dry Reforming of Methane to Synthesis Gas

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Product

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Novel MoO₂/carbon hierarchical nano/microcomposites: synthesis, characterization, solid state transformations and thiophene HDS activity