scholarly journals Investigation on the Suitability of Engelhard Titanium Silicate as a Support for Ni-Catalysts in the Methanation Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1225
Author(s):  
Patrizia Frontera ◽  
Mariachiara Miceli ◽  
Francesco Mauriello ◽  
Pierantonio De Luca ◽  
Anastasia Macario
Keyword(s):  
Catalytic Performance ◽  
Titanium Content ◽  
Low Grade ◽  
Ni Catalysts ◽  
Titanium Silicate ◽  
Co2 Methanation ◽  
Methanation Reaction ◽  
Titanium Silicates ◽  
Adsorption Desorption ◽  
Catalytic Performances

Methanation reaction of carbon dioxide is currently envisaged as a facile solution for the storage and transportation of low-grade energies, contributing at the same time to the mitigation of CO2 emissions. In this work, a nickel catalyst impregnated onto a new support, Engelhard Titanium Silicates (ETS), is proposed, and its catalytic performance was tested toward the CO2 methanation reaction. Two types of ETS material were investigated, ETS-4 and ETS-10, that differ from each other in the titanium content, with Si/Ti around 2 and 3% by weight, respectively. Catalysts, loaded with 5% of nickel, were tested in the CO2 methanation reaction in the temperature range of 300–500 °C and were characterized by XRD, SEM–EDX, N2 adsorption–desorption and H2-TPR. Results showed an interesting catalytic activity of the Ni/ETS catalysts. Particularly, the best catalytic performances are showed by Ni/ETS-10: 68% CO2 conversion and 98% CH4 selectivity at T = 400 °C. The comparison of catalytic performance of Ni/ETS-10 with those obtained by other Ni-zeolites catalysts confirms that Ni/ETS-10 catalyst is a promising one for the CO2 methanation reaction.

scholarly journals CO2 Methanation over Ni/Al@MAl2O4 (M = Zn, Mg, or Mn) Catalysts

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 599 ◽  
Author(s):  
Le ◽  
Kim ◽  
Jeong ◽  
Park
Keyword(s):  
Surface Oxidation ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Core Shell ◽  
Ni Doping ◽  
Ni Catalysts ◽  
Co2 Methanation ◽  
Temperature Programmed ◽  
Diffuse Reflectance Infrared ◽  
Spinel Structures

In this study, unique core-shell aluminate spinel supports, Al@MAl2O4 (M = Zn, Mg, or Mn), were obtained by simple hydrothermal surface oxidation and were applied to the preparation of supported Ni catalysts for CO2 methanation. For comparison, CO methanation was also evaluated using the same catalysts. The prepared catalysts were characterized with a variety of techniques, including N2 physisorption, CO2 chemisorption, H2 chemisorption, temperature-programmed reduction with H2, temperature-programmed desorption of CO2, X-ray diffraction, high-resolution transmission electron microscopy, and in-situ diffuse reflectance infrared Fourier transform spectroscopy. The combination of supports with core-shell spinel structures and Ni doping with a deposition–precipitation method created outstanding catalytic performance of the Ni catalysts supported on Al@MgAl2O4 and Al@MnAl2O4 due to improved dispersion of Ni nanoparticles and creation of moderate basic sites with suitable strength. Good stability of Ni/Al@MnAl2O4 catalyst was also confirmed in the study.

scholarly journals Ca-Doped CrOX/γ-Al2O3 Catalysts with Improved Dehydrogenation Performance for the Conversion of Isobutane to Isobutene

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 968
Author(s):  
Guangjian Wang ◽  
Ning Song ◽  
Kai Lu ◽  
Wentai Wang ◽  
Liancheng Bing ◽  
...  
Keyword(s):  
Building Blocks ◽  
Catalytic Performance ◽  
Active Species ◽  
Low Carbon ◽  
One Pot ◽  
Ca Doping ◽  
Increasing Demand ◽  
Adsorption Desorption ◽  
Al2o3 Catalyst ◽  
Catalytic Performances

The dehydrogenation of low-carbon alkane to obtain olefins is an effective way to meet the steadily increasing demand of these building blocks in chemical industry. In this study, Ca-doped CrOx/γ-Al2O3 catalysts were fabricated via a one-pot method by employing Cr(OH)3 as the precursor, and their catalytic performances were tested in the dehydrogenation of isobutane to isobutene (DITI) process. The prepared catalysts were intensively characterized by XRD, SEM, NH3-TPD, H2-TPR, low-temperature N2 adsorption–desorption, etc. These characterization results indicated that the doping of Ca into the CrOx/γ-Al2O3 catalysts could tune the acidity properties of the prepared catalysts and enhance the interaction between the active species and support. The Ca-doped CrOx/γ-Al2O3 catalysts, especially the Ca2-Cr/γ-Al2O3 catalyst with a Ca doping of 2 wt%, exhibited a superior catalytic performance in the DITI process in comparison with the undoped catalyst.

Catalytic performance of Ni catalysts supported on CeO2 with different morphologies for low-temperature CO2 methanation

2020 ◽  
Author(s):  
Thapanee Jomjaree ◽  
Paweennut Sintuya ◽  
Atthapon Srifa ◽  
Wanida Koo-amornpattana ◽  
Sirapassorn Kiatphuengporn ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
Ni Catalysts ◽  
Co2 Methanation

scholarly journals Three-Dimensional Mesoporous Ni-CeO2 Catalysts with Ni Embedded in the Pore Walls for CO2 Methanation

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 523 ◽  
Author(s):  
Luhui Wang ◽  
Junang Hu ◽  
Hui Liu ◽  
Qinhong Wei ◽  
Dandan Gong ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Nitrogen Adsorption ◽  
Combustion Method ◽  
Catalytic Performance ◽  
Oxide Interface ◽  
Solution Combustion ◽  
Co2 Methanation ◽  
Transmission Electron ◽  
Temperature Programmed ◽  
Adsorption Desorption

Mesoporous Ni-based catalysts with Ni confined in nanochannels are widely used in CO2 methanation. However, when Ni loadings are high, the nanochannels are easily blocked by nickel particles, which reduces the catalytic performance. In this work, three-dimensional mesoporous Ni-CeO2-CSC catalysts with high Ni loadings (20−80 wt %) were prepared using a colloidal solution combustion method, and characterized by nitrogen adsorption–desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and H2 temperature programmed reduction (H2-TPR). Among the catalysts with different Ni loadings, the 50% Ni-CeO2-CSC with 50 wt % Ni loading exhibited the best catalytic performance in CO2 methanation. Furthermore, the 50% Ni-CeO2-CSC catalyst was stable for 50 h at 300° and 350 °C in CO2 methanation. The characterization results illustrate that the 50% Ni-CeO2-CSC catalyst has Ni particles smaller than 5 nm embedded in the pore walls, and the Ni particles interact with CeO2. On the contrary, the 50% Ni-CeO2-CP catalyst, prepared using the traditional coprecipitation method, is less active and selective for CO2 methanation due to the larger size of the Ni and CeO2 particles. The special three-dimensional mesoporous embedded structure in the 50% Ni-CeO2-CSC can provide more metal–oxide interface and stabilize small Ni particles in pore walls, which makes the catalyst more active and stable in CO2 methanation.

scholarly journals Role of oxide support in Ni based catalysts for CO2 methanation

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17648-17657
Author(s):  
Ye Hwan Lee ◽  
Jeong Yoon Ahn ◽  
Dinh Duc Nguyen ◽  
Soon Woong Chang ◽  
Sung Su Kim ◽  
...  
Keyword(s):  
Co2 Methanation ◽  
Methanation Reaction ◽  
Support Interaction ◽  
Oxide Support ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Catalytic Performances

The effect of metal–support interaction and role of support on catalytic performances during Ni based CO2 methanation reaction were investigated.

scholarly journals Study Ni Nanoparticles on Reducible Metal Oxides (Sm2O3, CeO2, ZnO) as Catalysts for CO2 Methanation

2021 ◽  
Vol 16 (3) ◽  
pp. 641-650
Author(s):  
Athirah Ayub ◽  
Hasliza Bahruji ◽  
Abdul Hanif Mahadi
Keyword(s):  
Oxygen Vacancies ◽  
Interfacial Interaction ◽  
Co2 Conversion ◽  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
Methanation Reaction ◽  
Metal Support ◽  
Reducing Environment ◽  
Open Access Article ◽  
Catalytic Performances

The activity of reducible metal oxide Sm2O3, CeO2, and ZnO as Ni nanoparticles support was investigated for CO2 methanation reaction. CO2 methanation was carried out between 200 °C to 450 °C with the optimum catalytic activity was observed at 450 °C. The reducibility of the catalysts has been comparatively studied using H2-Temperature Reduction Temperature (TPR) method. The H2-TPR analysis also elucidated the formation of surface oxygen vacancies at temperature above 600 °C for 5Ni/Sm2O3 and 5Ni/CeO2. The Sm2O3 showed superior activity than CeO2 presumably due to the transition of the crystalline phases under reducing environment. However, the formation of NiZn alloy in 5Ni/ZnO reduced the ability of Ni to catalyze methanation reaction. A highly dispersed Ni on Sm2O3 created a large metal/support interfacial interaction to give 69% of CO2 conversion with 100% selectivity at 450 °C. The 5Ni/Sm2O3 exhibited superior catalytic performances with an apparent phase transition from cubic to a mixture of cubic and monoclinic phases over a long reaction, presumably responsible for the enhanced conversion after 10 h of reaction. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Structural Investigation of the Carbon Deposits on Ni/Al2O3 Catalyst Modified by CaO-MgO for the Biogas Dry Reforming Reaction

2020 ◽  
Vol 2 (1) ◽  
pp. 15
Author(s):  
Nikolaos D. Charisiou ◽  
Georgios I. Siakavelas ◽  
Victor Sebastian ◽  
Steven J. Hinder ◽  
Mark A. Baker ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Structural Investigation ◽  
Catalytic Performance ◽  
Dry Reforming ◽  
Ni Catalysts ◽  
Carbon Deposits ◽  
Carbon Structures ◽  
Spent Catalysts ◽  
Adsorption Desorption ◽  
Al2o3 Catalyst

Ni catalysts based on Al2O3 and Al2O3 modified with CaO-MgO were tested for the dry reforming of biogas (BDR). Time-on-stream experiments were carried out between 600 and 800 °C, and the spent catalysts were examined using a variety of characterization techniques including, N2 adsorption/desorption, thermogravimetric analysis (TGA), Raman spectroscopy, electron microscopy (STEM-HAADF and HR-TEM), and X-ray photoelectron spectroscopy (XPS). It was revealed that the carbon deposits consisted of carbon nanotubes and amorphous carbon for both samples. XPS studies showed the presence of Ni0 on both catalysts and Ni2O3/NiAl2O4 on the Ni/Al2O3 sample. The time-on-stream experiments showed that the Ni/CaO-MgO-Al2O3 catalyst is more resistant to deactivation and more active and selective for all temperatures under investigation. It was concluded that doping Al2O3 with CaO-MgO enhances catalytic performance as: (a) it helps to maintain highly dispersed Ni0 during the BDR as the interaction between metal and support is a stronger one, (b) it leads to the formation of carbon structures that are easier to oxidize, and (c) it facilitates the gasification of the carbon deposits because its increased surface basic sites enhance the adsorption of carbon dioxide.

scholarly journals Investigation of Catalyst Development from Mg2NiH4 Hydride and Its Application for the CO2 Methanation Reaction

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1178
Author(s):  
Martynas Lelis ◽  
Sarunas Varnagiris ◽  
Marius Urbonavicius ◽  
Kestutis Zakarauskas
Keyword(s):  
Thermogravimetric Analysis ◽  
Scale Development ◽  
Gas Flow ◽  
Catalytic Properties ◽  
Low Grade ◽  
High Grade ◽  
Co2 Methanation ◽  
Catalyst Development ◽  
Methanation Reaction ◽  
Catalyst Formation

In current study various aspects of catalyst development for the Sabatier type methanation reaction were investigated. It was demonstrated that starting from 330–380 °C Mg2NiH4 hydride heating under CO2 and H2 gas flow initiates hydride decomposition, disproportionation and oxidation. These reactions empower catalytic properties of the material and promotes CO2 methanation reaction. Detailed structural, colorimetric and thermogravimetric analysis revealed that in order to have fast and full-scale development of the catalyst (formation of MgO decorated by nanocrystalline Ni) initial hydride has to be heated above 500 °C. Another considerable finding of the study was confirmation that potentially both high grade and low grade starting Mg2Ni alloy can be equally suitable for the hydride synthesis and its usage for the promotion of methanation reactions.

scholarly journals Effect of Support and Chelating Ligand on the Synthesis of Ni Catalysts with High Activity and Stability for CO2 Methanation

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 493 ◽  
Author(s):  
Vetrivel Shanmugam ◽  
Stefan Neuberg ◽  
Ralf Zapf ◽  
Helmut Pennemann ◽  
Gunther Kolb
Keyword(s):  
Catalytic Performance ◽  
Impregnation Method ◽  
Chelating Ligands ◽  
Co2 Conversion ◽  
Ni Catalysts ◽  
Co2 Methanation ◽  
High Co2 ◽  
X Ray ◽  
Metal Support Interaction ◽  
Methane Selectivity

Carbon dioxide methanation was carried out over Ni-based catalysts on different supports and chelating ligands in microreactors. To investigate the influence of chelating ligands and supports, the Ni catalysts were prepared using different support such as CeO2, Al2O3, SiO2, and SBA-15 by a citric acid (CA)-assisted impregnation method. The properties of the developed catalysts were studied by X-ray diffraction (XRD), Transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) measurement, and the results show that the addition of CA in the impregnation solution improved the dispersion, refines the particle size, and enhanced the interaction of nickel species. The catalytic performance of the developed Ni catalysts were evaluated by CO2 methanation in microreactors in the temperature range of 275 °C–375 °C under 12.5 bar pressure. All the catalysts exhibit high CO2 conversion and extremely high selectivity to methane. However, the catalysts prepared via CA-assisted method exhibited excellent activity and stability, compared with Ni catalysts prepared by a conventional impregnation method, which could be attributed to highly dispersed nickel particles with strong metal–support interaction. The activity of CO2 methanation followed the order of Ni/CeO2-CA > Ni/SBA-15-CA > Ni/Al2O3-CA > Ni/SiO2-CA > Ni/CeO2. The Ni/CeO2 catalysts have also been prepared using different chelating ligands such as ethylene glycol (EG), sucrose (S), oxalic acid (OA) and ethylene diamine tetra acidic acid (EDTA). Among the tested catalysts prepared with different support and chelating ligands, the Ni/CeO2 catalyst prepared via CA-assisted method gave superior catalytic performance and it could attain 98.6% of CO2 conversion and 99.7% methane selectivity at 325 °C. The partial reduction of the CeO2 support generates more surface oxygen vacancies and results in a high CO2 conversion and methane selectivity compared with other catalysts. The addition of CA as promoter favored the synergistic effect of Ni and support, which led to high dispersion, controls the size, and stabilizes the Ni nanoparticles. Furthermore, the Ni/CeO2-CA catalyst yields high CO2 conversion in a time-on-stream study due to the ability of preventing the carbon deposition and sintering of Ni particles under the applied reaction conditions. However, the Ni/Al2O3-CA and Ni/SBA-15-CA catalysts showed stable performance for 100 h of time on stream.

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