scholarly journals Kinetic Regularities of Methane Dry Reforming Reaction on Nickel-Containing Modified Ceria–Zirconia

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2973
Author(s):  
Valeria Fedorova ◽  
Mikhail Simonov ◽  
Konstantin Valeev ◽  
Yuliya Bespalko ◽  
Ekaterina Smal ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Catalytic Properties ◽  
Plug Flow ◽  
Reaction Rate Constant ◽  
Dry Reforming ◽  
Incipient Wetness Impregnation ◽  
One Pot ◽  
Methane Dry Reforming ◽  
Metal Support Interaction ◽  
Detailed Kinetics

The Ni-containing catalysts based on ceria–zirconia doped with Ti and Ti+Nb were prepared by the solvothermal method in supercritical fluids. Ni deposition was carried out by incipient wetness impregnation and the one-pot technique. All materials were investigated by a complex of physicochemical methods (XRD, BET, TEM, H2-TPR). Samples catalytic properties were studied in methane dry reforming in the plug-flow reactor. Conversions of CH4 and CO2, H2/CO ratio, and CO and H2 yields were measured, and detailed kinetics analysis was carried out. The influence of Ni loading method and support modification on the catalytic behavior in the methane dry reforming process was studied. The preparation method of catalysts affects the textural characteristics. For one-pot samples, pore volume and surface area are lower than for impregnated samples. For catalysts on modified supports, strong metal–support interaction was shown to increase catalytic activity. A reduction pretreatment of samples was shown to have significant influence on their catalytic properties. The kinetic parameters such as reaction rate constant at 700 °C, effective activation energy, and TOF were estimated and analyzed.

scholarly journals Structural, Textural, and Catalytic Properties of Ni-CexZr1−xO2 Catalysts for Methane Dry Reforming Prepared by Continuous Synthesis in Supercritical Isopropanol

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3728
Author(s):  
Svetlana Pavlova ◽  
Marina Smirnova ◽  
Aleksei Bobin ◽  
Svetlana Cherepanova ◽  
Vasily Kaichev ◽  
...  
Keyword(s):  
Nickel Nanoparticles ◽  
Catalytic Properties ◽  
Dry Reforming ◽  
High Dispersion ◽  
Incipient Wetness Impregnation ◽  
One Pot ◽  
Methane Dry Reforming ◽  
Continuous Synthesis ◽  
The One ◽  
Supercritical Isopropanol

A series of 5%Ni-CexZr1−xO2 (x = 0.3, 0.5, 0.7) catalysts has been prepared via one-pot solvothermal continuous synthesis in supercritical isopropanol and incipient wetness impregnation of CexZr1−xO2 obtained by the same route. The textural, structural, red-ox, and catalytic properties in methane dry reforming (MDR) of Ni-modified Ce-Zr oxides synthesized by two routes have been compared. It was shown by XRD, TEM, and Raman spectroscopy that the method of Ni introduction does not affect the phase composition of the catalysts, but determines the dispersion of NiO. Despite a high dispersion of NiO and near-uniform distribution of Ni within Ce-Zr particles observed for the one-pot catalysts, they have shown a lower activity and stability in MDR as compared with impregnated ones. This is a result of a low Ni concentration in the surface layer due to segregation of Ce and decoration of nickel nanoparticles with support species.

One-pot synthesis of highly sintering- and coking-resistant Ni nanoparticles encapsulated in dendritic mesoporous SiO2 for methane dry reforming

2018 ◽  
Vol 54 (99) ◽  
pp. 13993-13996 ◽  
Author(s):  
Jingqing Tian ◽  
Bing Ma ◽  
Saiyu Bu ◽  
Qinghong Yuan ◽  
Chen Zhao
Keyword(s):  
Dry Reforming ◽  
Ni Nanoparticles ◽  
One Pot ◽  
Methane Dry Reforming ◽  
One Pot Synthesis ◽  
Mesoporous Sio2

We present a one-pot method for the encapsulation of small Ni particles into a dendritic SiO2 skeleton.

The effect of CeO2 on the surface and catalytic properties of Pt/CeO2–ZrO2 catalysts for methane dry reforming

2009 ◽  
Vol 89 (1-2) ◽  
pp. 149-159 ◽  
Author(s):  
S. Damyanova ◽  
B. Pawelec ◽  
K. Arishtirova ◽  
M.V. Martinez Huerta ◽  
J.L.G. Fierro
Keyword(s):  
Catalytic Properties ◽  
Dry Reforming ◽  
Methane Dry Reforming

scholarly journals Ni-containing catalysts based on ordered mesoporous MgO–Al2O3for methane dry reforming

2018 ◽  
Vol 5 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Svetlana Pavlova ◽  
Yuliya Fedorova ◽  
Arkadii Ishchenko ◽  
Maxim Melgunov ◽  
Elena Melgunova ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Structure ◽  
Dry Reforming ◽  
One Pot ◽  
Methane Dry Reforming ◽  
Pluronic P123 ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly ◽  
The One ◽  
Adsorption Desorption

Abstract The ordered mesoporous Mg- and Ni-Mg-alumina samples of general formula xwt%Mg-Al2O3 and ywt%Nixwt% Mg-Al2O3(x, y = 5, 10 % wt) have been prepared by the one-pot evaporation induced self-assembly (EISA) method using Pluronic P123 as a template. The textural and structural properties of the prepared samples have been characterized by N2adsorption-desorption analysis, BET, XRD, TEM with EDX, HAADF-STEM, and H2-TPR. The samples calcined at 700°C had an ordered mesoporous structure with a SSA of 170-250 m2/g, a pore volume of 0.5-0.64 cm3/g and a narrow distribution of the pore size (mean 12-16 nm). For the catalysts prepared by the one-pot EISA method, the size of the metal Ni particles was in the range of 3-12 nm and was conditioned by their confinement in the mesopores and the interaction with MgO and Al2O3. Testing in methane dry reforming in the 15v.% CH4+ 15v.%CO2feed, with He balance, at 650-750°C and the contact time of 0.015 s has shown the higher activity and stability of the ordered mesoporous 10w%Ni- 10w%Mg-Al2O3catalysts prepared by the one-pot method as compared with the catalyst of the same composition obtained by impregnation.

scholarly journals The Distinctive Effects of Glucose-Derived Carbon on the Performance of Ni-Based Catalysts in Methane Dry Reforming

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 21
Author(s):  
UPM Ashik ◽  
Shusaku Asano ◽  
Shinji Kudo ◽  
Doan Pham Minh ◽  
Srinivas Appari ◽  
...  
Keyword(s):  
Physicochemical Characteristics ◽  
Dry Reforming ◽  
Co2 Conversion ◽  
Metal Dispersion ◽  
Ni Catalysts ◽  
Methane Dry Reforming ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
The Stability

This study aimed to investigate the effect of carbon derived from glucose (C) on the physicochemical characteristics and catalytic activity of Ni, supported over SiO2, ZSM-5, and TiO2 in methane dry reforming. Among the Ni catalysts without C, Ni/SiO2 exhibited the highest CH4-CO2 conversion and stability at all experimented temperatures. On the other hand, the C-incorporated catalysts prepared by glucose impregnation, followed by pyrolysis, showed dissimilar performances. C improved the stability of Ni/SiO2 in the reforming at 650 °C and 750 °C and increased the CH4 and CO2 conversion to the level close to the thermodynamic equilibrium at 850 °C. However, this element did not substantially affect the activity of Ni/ZSM-5 and exerted a retarding effect on Ni/TiO2. Characterizations with H2-TPD, XRD, EXAFS, and STEM-EDS revealed that the different influences of C by the supports were attributed to the extent of metal dispersion and metal-support interaction.

scholarly journals Nanosized Ni/SBA-15 Catalysts for CO2 Reforming of CH4

2019 ◽  
Vol 9 (9) ◽  
pp. 1926 ◽  
Author(s):  
Ahmed A. Ibrahim ◽  
Ashraf Amin ◽  
Ahmed S. Al-Fatesh ◽  
Nadavala Siva Kumar ◽  
Samsudeen Olajide Kasim ◽  
...  
Keyword(s):  
Bimetallic Catalysts ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Fixed Bed Reactor ◽  
Co2 Reforming ◽  
Methane Dry Reforming ◽  
Remarkable Effect ◽  
Co2 Reforming Of Ch4

Ni, Co, and Co–Ni bimetallic catalysts supported over SBA-15 and over SBA-15 doped with Zn or Ce oxides were prepared and tested in a methane dry reforming reaction. The loading of the metals in the catalyst was 5 wt % for either mono or bimetallic catalysts. The prepared catalysts were tested in a continuous-flow fixed-bed reactor at 800 °C under atmospheric pressure. XRD, TPR, TPD, and SEM characterization techniques were employed to investigate the catalytic properties of fresh catalysts. SEM and TGA were used to study the catalytic properties of spent catalysts. A remarkable effect on the reduction properties and catalytic performance of catalysts was observed after adding Zn and Ce. Over an 8 h test, Ni/SBA-15 showed the best activity and stability. The conversion was 90% for CH4 and CO2. Co–Ni/SBA-15 and Co–Ni/Ce–SBA-15 have shown a reasonable activity and stability. Selectivity of the Ni/SBA-15 catalyst was higher than all other catalysts as indicated by the H2/CO ratio. Co/SBA-15 and Co–Ni/Zn–SBA-15 showed a low activity and selectivity. TPD–NH3 profiles indicated that doping SBA-15 with Ce and/or Zn increased the catalyst acidic sites. Ni/SBA-15 is an excellent potential catalyst for commercial methane dry reforming processes.

scholarly journals One-pot prepared mesoporous silica SBA-15-like monoliths with embedded Ni particles as selective and stable catalysts for methane dry reforming

2021 ◽  
Vol 280 ◽  
pp. 119417 ◽  
Author(s):  
Oscar Daoura ◽  
Giulia Fornasieri ◽  
Maya Boutros ◽  
Nissrine El Hassan ◽  
Patricia Beaunier ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Dry Reforming ◽  
One Pot ◽  
Methane Dry Reforming

scholarly journals Novel Ni/Ce(Ti)ZrO2 Catalysts for Methane Dry Reforming Prepared in Supercritical Alcohol Media

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3365
Author(s):  
Yuliya Bespalko ◽  
Ekaterina Smal ◽  
Mikhail Simonov ◽  
Konstantin Valeev ◽  
Valeria Fedorova ◽  
...  
Keyword(s):  
Pechini Method ◽  
Nickel Catalysts ◽  
Oxygen Storage Capacity ◽  
Dry Reforming ◽  
Oxygen Storage ◽  
Dry Reforming Of Methane ◽  
Incipient Wetness Impregnation ◽  
One Pot ◽  
Oxide Support ◽  
Supercritical Alcohol

To achieve a high activity and coking stability of nickel catalysts in dry reforming of methane, materials comprised of ceria–zirconia doped by Ti were investigated as supports. Ceria–zirconia supports doped with titanium were prepared either via the Pechini method or by synthesis in supercritical alcohol media. Ni-containing catalysts were prepared by two techniques: standard incipient wetness impregnation and one-pot synthesis. The catalytic reaction of DRM to synthesis gas was carried out in the 600–750 °C range over 5% wt. Ni/Ce(Ti)ZrO2. Dried and calcined supports and catalysts were characterized by physicochemical methods including N2 adsorption, XRD, Raman, H2-TPR, and HRTEM. Both preparation methods led to formation of solid solution with cubic fluorite-like structure, as well as after addition of Ti. Introduction of Ti should provide improved oxygen storage capacity and mobility of support oxygen. The highest activity was observed with the catalyst of 5% wt. Ni/Ce0.75Ti0.2Zr0.05O2−δ composition due to optimized oxide support structure and support oxygen mobility.

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