scholarly journals Role of Mixed Oxides in Hydrogen Production through the Dry Reforming of Methane over Nickel Catalysts Supported on Modified γ-Al2O3

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 157
Author(s):  
Ahmed Sadeq Al-Fatesh ◽  
Mayankkumar Lakshmanbhai Chaudhary ◽  
Anis Hamza Fakeeha ◽  
Ahmed Aidid Ibrahim ◽  
Fahad Al-Mubaddel ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Nickel Catalysts ◽  
H2 Production ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Incipient Wetness Impregnation ◽  
Thermally Stable ◽  
Oxide Systems ◽  
Catalyst Systems ◽  
H2 Yield

H2 production through dry reforming of methane (DRM) is a hot topic amidst growing environmental and atom-economy concerns. Loading Ni-based reducible mixed oxide systems onto a thermally stable support is a reliable approach for obtaining catalysts of good dispersion and high stability. Herein, NiO was dispersed over MOx-modified-γ-Al2O3 (M = Ti, Mo, Si, or W; x = 2 or 3) through incipient wetness impregnation followed by calcination. The obtained catalyst systems were characterized by infrared, ultraviolet–visible, and X-ray photoelectron spectroscopies, and H2 temperature-programmed reduction. The mentioned synthetic procedure afforded the proper nucleation of different NiO-containing mixed oxides and/or interacting-NiO species. With different modifiers, the interaction of NiO with the γ-Al2O3 support was found to change, the Ni2+ environment was reformed exclusively, and the tendency of NiO species to undergo reduction was modified greatly. Catalyst systems 5Ni3MAl (M = Si, W) comprised a variety of species, whereby NiO interacted with the modifier and the support (e.g., NiSiO3, NiAl2O4, and NiWO3). These two catalyst systems displayed equal efficiency, >70% H2 yield at 800 °C, and were thermally stable for up to 420 min on stream. 5Ni3SiAl catalyst regained nearly all its activity during regeneration for up to two cycles.

Study of Nickel Catalysts Supported on MnOx–CeO2 Mixed Oxides in Dry Reforming of Methane

2021 ◽  
Vol 62 (6) ◽  
pp. 765-777
Author(s):  
M. V. Grabchenko ◽  
N. V. Dorofeeva ◽  
I. N. Lapin ◽  
V. La Parola ◽  
L. F. Liotta ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Nickel Catalysts ◽  
Dry Reforming ◽  
Dry Reforming Of Methane

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.

scholarly journals Catalytic Performance of Metal Oxides Promoted Nickel Catalysts Supported on Mesoporous γ-Alumina in Dry Reforming of Methane

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 522
Author(s):  
Anis H. Fakeeha ◽  
Abdulaziz A. Bagabas ◽  
Mahmud S. Lanre ◽  
Ahmed I. Osman ◽  
Samsudeen O. Kasim ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Nickel Catalysts ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Coke Deposition ◽  
Dry Reforming Of Methane ◽  
Catalyst Stability ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Ni Catalysts

Dry reforming of CH4 was conducted over promoted Ni catalysts, supported on mesoporous gamma-alumina. The Ni catalysts were promoted by various metal oxides (CuO, ZnO, Ga2O3, or Gd2O3) and were synthesized by the incipient wetness impregnation method. The influence of the promoters on the catalyst stability, coke deposition, and H2/CO mole ratio was investigated. Stability tests were carried out for 460 min. The H2 yield was 87% over 5Ni+1Gd/Al, while the CH4 and CO2 conversions were found to decrease in the following order: 5Ni+1Gd/Al > 5Ni+1Ga/Al > 5Ni+1Zn/Al > 5Ni/Al > 5Ni+1Cu/Al. The high catalytic performance of 5Ni+1Gd/Al, 5Ni+1Ga/Al, and 5Ni+1Zn/Al was found to be closely related to their contents of NiO species, which interacted moderately and strongly with the support, whereas free NiO in 5Ni+1Cu/Al made it catalytically inactive, even than 5Ni/Al. The 5Ni+1Gd/Al catalyst showed the highest CH4 conversion of 83% with H2/CO mole ratio of ~1.0.

scholarly journals Preparation, Characterization, and Activity of Pd/PSS-Modified Membranes in the Low Temperature Dry Reforming of Methane with and without Addition of Extra Steam

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 518
Author(s):  
Cecilia Mateos-Pedrero ◽  
Miguel A. Soria ◽  
Antonio Guerrero-Ruíz ◽  
Inmaculada Rodríguez-Ramos
Keyword(s):  
Low Temperature ◽  
Flow Reactor ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Porous Stainless Steel ◽  
Pd Membrane ◽  
Continuous Flow Reactor ◽  
Oxidation In Air ◽  
H2 Yield ◽  
Water Gas

The external surface of a commercial porous stainless steel (PSS) was modified by either oxidation in air at varying temperatures (600, 700, and 800 °C) or coating with different oxides (SiO2, Al2O3, and ZrO2). Among them, PSS-ZrO2 appears as the most suitable carrier for the synthesis of the Pd membrane. A composite Pd membrane supported on the PSS-ZrO2 substrate was prepared by the electroless plating deposition method. Supported Ru catalysts were first evaluated for the low-temperature methane dry reforming (DRM) reaction in a continuous flow reactor (CR). Ru/ZrO2-La2O3 catalyst was found to be active and stable, so it was used in a membrane reactor (MR), which enhances the methane conversions above the equilibrium values. The influence of adding H2O to the feed of DRM was investigated over a Ru/ZrO2-La2O3 catalyst in the MR. Activity results are compared with those measured in a CR. The addition of H2O into the feed favors other reactions such as Water-Gas Shift (RWGS) and Steam Reforming (SR), which occur together with DRM, resulting in a dramatic decrease of CO2 conversion and CO production, but a marked increase of H2 yield.

scholarly journals Highly-efficient hydroxyapatite-supported nickel catalysts for dry reforming of methane

2020 ◽  
Vol 45 (36) ◽  
pp. 18502-18518 ◽  
Author(s):  
Bruna Rego de Vasconcelos ◽  
Doan Pham Minh ◽  
Emmanuel Martins ◽  
Alain Germeau ◽  
Patrick Sharrock ◽  
...  
Keyword(s):  
Nickel Catalysts ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Highly Efficient ◽  
Supported Nickel Catalysts

Ni–Nb-Based Mixed Oxides Precursors for the Dry Reforming of Methane

2011 ◽  
Vol 54 (1-4) ◽  
pp. 170-178 ◽  
Author(s):  
Juan Alvarez ◽  
Gustavo Valderrama ◽  
Eglé Pietri ◽  
María Josefina Pérez-Zurita ◽  
Caribay Urbina de Navarro ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Dry Reforming ◽  
Dry Reforming Of Methane

Effect of a second metal (Co, Cu, Mn or Zr) on nickel catalysts derived from hydrotalcites for the carbon dioxide reforming of methane

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 70537-70546 ◽  
Author(s):  
Xiaopeng Yu ◽  
Fubao Zhang ◽  
Wei Chu
Keyword(s):  
Carbon Dioxide ◽  
Nickel Catalysts ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Ni Catalyst ◽  
Carbon Dioxide Reforming ◽  
Enhanced Stability

NiCo and NiCu catalysts exhibited enhanced stability compared with a Ni catalyst for the dry reforming of methane. On the contrary, NiMn and NiZr catalysts decreased the reforming stability.

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