Physical mixing of TiO2 with sponge nickel creates new active sites for selective CO methanation

2016 ◽  
Vol 6 (11) ◽  
pp. 3713-3717 ◽  
Author(s):  
S. Tada ◽  
D. Shoji ◽  
K. Urasaki ◽  
N. Shimoda ◽  
S. Satokawa
Keyword(s):  
Metal Oxides ◽  
Active Sites ◽  
Physical Contact ◽  
Co Methanation ◽  
Selective Co Methanation ◽  
Physical Mixing

Ni–α-Al2O3, Ni–SiO2, Ni–γ-Al2O3, Ni–TiO2, and Ni–ZrO2 were prepared by physical mixing of metal oxides with sponge Ni, and the effect of physical contact of the metal oxides with sponge Ni on selective CO methanation was examined.

scholarly journals Selective CO Methanation Over Ru Supported on Carbon Spheres: The Effect of Carbon Functionalization on the Reverse Water Gas Shift Reaction

2018 ◽  
Vol 148 (11) ◽  
pp. 3502-3513 ◽  
Author(s):  
David O. Kumi ◽  
Mbongiseni W. Dlamini ◽  
Tumelo N. Phaahlamohlaka ◽  
Sabelo D. Mhlanga ◽  
Neil J. Coville ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Carbon Spheres ◽  
Co Methanation ◽  
Reverse Water Gas Shift ◽  
Selective Co Methanation ◽  
Shift Reaction ◽  
Water Gas

scholarly journals CO Oxidation over Metal Oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2) Doped CuO-Based Catalysts Supported on Mesoporous Ce0.8Zr0.2O2 with Intensified Low-Temperature Activity

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 724 ◽  
Author(s):  
Yan Cui ◽  
Leilei Xu ◽  
Mindong Chen ◽  
Chufei Lv ◽  
Xinbo Lian ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Co Oxidation ◽  
Active Sites ◽  
Earth Metal ◽  
High Dispersion ◽  
Impregnation Method ◽  
X Ray

CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2 support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2 temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3 showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2 solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.

scholarly journals Designing and Fabricating Ordered Mesoporous Metal Oxides for CO2 Catalytic Conversion: A Review and Prospect

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 276 ◽  
Author(s):  
Yan Cui ◽  
Xinbo Lian ◽  
Leilei Xu ◽  
Mindong Chen ◽  
Bo Yang ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Active Sites ◽  
Porous Metal ◽  
Catalytic Conversion ◽  
Thermal Stabilities ◽  
Heterogeneous Catalytic ◽  
Mesoporous Metal Oxides ◽  
Internal Surfaces ◽  
Ordered Mesoporous ◽  
Mesoporous Metal

In the past two decades, great progress has been made in the aspects of fabrication and application of ordered mesoporous metal oxides. Ordered mesoporous metal oxides have attracted more and more attention due to their large surface areas and pore volumes, unblocked pore structure, and good thermal stabilities. Compared with non-porous metal oxides, the most prominent feature is their ability to interact with molecules not only on their outer surface but also on the large internal surfaces of the material, providing more accessible active sites for the reactants. This review carefully describes the characteristics, classification and synthesis of ordered mesoporous metal oxides in detail. Besides, it also summarizes the catalytic application of ordered mesoporous metal oxides in the field of carbon dioxide conversion and resource utilization, which provides prospective viewpoints to reduce the emission of greenhouse gas and the inhibition of global warming. Although the scope of current review is mainly limited to the ordered mesoporous metal oxides and their application in the field of CO2 catalytic conversion via heterogeneous catalysis processes, we believe that it will provide new insights and viewpoints to the further development of heterogeneous catalytic materials.

scholarly journals Effect of a titania covering on CNTS as support for the Ru catalysed selective CO methanation

2018 ◽  
Vol 232 ◽  
pp. 492-500 ◽  
Author(s):  
David O. Kumi ◽  
Tumelo N. Phaahlamohlaka ◽  
Mbongiseni W. Dlamini ◽  
Ian T. Mangezvo ◽  
Sabelo D. Mhlanga ◽  
...  
Keyword(s):  
Co Methanation ◽  
Selective Co Methanation

scholarly journals Selective CO Methanation in H2-Rich Gas for Household Fuel Cell Applications

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2844 ◽  
Author(s):  
Panagiota Garbis ◽  
Andreas Jess
Keyword(s):  
Fuel Cell ◽  
Natural Gas ◽  
Fixed Bed ◽  
Cell System ◽  
Operating Conditions ◽  
Attractive Alternative ◽  
Inlet Temperature ◽  
Co2 Methanation ◽  
Co Methanation ◽  
Selective Co Methanation

Polymer electrolyte membrane fuel cells (PEMFCs) are often used for household applications, utilizing hydrogen produced from natural gas from the gas grid. The hydrogen is thereby produced by steam reforming of natural gas followed by a water gas shift (WGS) unit. The H2-rich gas contains besides CO2 small amounts of CO, which deactivates the catalyst used in the PEMFCs. Preferential oxidation has so far been a reliable process to reduce this concentration but valuable H2 is also partly converted. Selective CO methanation considered as an attractive alternative. However, CO2 methanation consuming the valuable H2 has to be minimized. The modelling of selective CO methanation in a household fuel cell system is presented. The simulation was conducted for single and two-stage adiabatic fixed bed reactors (in the latter case with intermediate cooling), and the best operating conditions to achieve the required residual CO content (100 ppm) were calculated. This was done by varying the gas inlet temperature as well as the mass of the catalyst. The feed gas represented a reformate gas downstream of a typical WGS reaction unit (0.5%–1% CO, 10%–25% CO2, and 5%–20% H2O (rest H2)).

Effects of preparation conditions of Ni/TiO2 catalysts for selective CO methanation in the reformate gas

2013 ◽  
Vol 452 ◽  
pp. 174-178 ◽  
Author(s):  
Kohei Urasaki ◽  
Yuta Tanpo ◽  
Yuta Nagashima ◽  
Ryuji Kikuchi ◽  
Shigeo Satokawa
Keyword(s):  
Co Methanation ◽  
Preparation Conditions ◽  
Selective Co Methanation ◽  
Reformate Gas

Effect of reduction pretreatment and support materials on selective CO methanation over supported Ru catalysts

2011 ◽  
Vol 404 (1-2) ◽  
pp. 149-154 ◽  
Author(s):  
Shohei Tada ◽  
Ryuji Kikuchi ◽  
Kohei Urasaki ◽  
Shigeo Satokawa
Keyword(s):  
Co Methanation ◽  
Ru Catalysts ◽  
Support Materials ◽  
Selective Co Methanation

Selective CO Methanation on Ru/TiO2 Catalysts: Role and Influence of Metal–Support Interactions

ACS Catalysis ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 6753-6763 ◽  
Author(s):  
Ali M. Abdel-Mageed ◽  
D. Widmann ◽  
S. E. Olesen ◽  
I. Chorkendorff ◽  
J. Biskupek ◽  
...  
Keyword(s):  
Co Methanation ◽  
Selective Co Methanation ◽  
Metal Support ◽  
Metal Support Interactions

Catalytic activity and durability of a mesoporous silica-coated Ni-alumina-based catalyst for selective CO methanation

2015 ◽  
Vol 251 ◽  
pp. 81-87 ◽  
Author(s):  
Toshihiro Miyao ◽  
Junya Tanaka ◽  
Weihua Shen ◽  
Katsuhiko Hayashi ◽  
Kazutoshi Higashiyama ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Co Methanation ◽  
Selective Co Methanation
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