MOF-derived hierarchical hollow spheres composed of carbon-confined Ni nanoparticles for efficient CO2 methanation

2019 ◽  
Vol 9 (3) ◽  
pp. 731-738 ◽  
Author(s):  
Xiahui Lin ◽  
Sibo Wang ◽  
Wenguang Tu ◽  
Zhibiao Hu ◽  
Zhengxin Ding ◽  
...  
Keyword(s):  
Hollow Spheres ◽  
Ni Nanoparticles ◽  
Co2 Methanation

Hierarchical Ni@C hollow spheres composed of dispersed Ni nanoparticles confined in carbon shells were readily synthesized for efficient CO2 methanation.

Highly dispersed and stable Ni nanoparticles confined by MgO on ZrO2 for CO2 methanation

2019 ◽  
Vol 481 ◽  
pp. 1538-1548 ◽  
Author(s):  
Jiaojiao Tan ◽  
Jiaming Wang ◽  
Ziyang Zhang ◽  
Zhi Ma ◽  
Luhui Wang ◽  
...  
Keyword(s):  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
Highly Dispersed

scholarly journals Co-Promoted Ni Nanocatalysts Derived from NiCoAl-LDHs for Low Temperature CO2 Methanation

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 121
Author(s):  
Fanying Zhang ◽  
Bin Lu ◽  
Peiqin Sun
Keyword(s):  
Low Temperature ◽  
Active Sites ◽  
High Performance ◽  
Carbon Deposition ◽  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
Test Conditions ◽  
Challenging Research ◽  
Continuous Reaction

Ni-based catalysts are prone to agglomeration and carbon deposition at high temperatures. Therefore, the development of Ni-based catalysts with high activities at low temperatures is a very urgent and challenging research topic. Herein, Ni-based nanocatalysts containing Co promoter with mosaic structure were prepared by reduction of NiCoAl-LDHs, and used for CO2 methanation. When the reaction temperature is 250 °C (0.1 MPa, GHSV = 30,000 mL·g−1·h−1), the conversion of CO2 on the NiCo0.5Al-R catalyst reaches 81%. However, under the same test conditions, the conversion of CO2 on the NiAl-R catalyst is only 26%. The low-temperature activity is significantly improved due to Co which can effectively control the size of the Ni particles, so that the catalyst contains more active sites. The CO2-TPD results show that the Co can also regulate the number of moderately basic sites in the catalyst, which is beneficial to increase the amount of CO2 adsorbed. More importantly, the NiCo0.5Al-R catalyst still maintains high catalytic performance after 92 h of continuous reaction. This is due to the confinement effect of the AlOx substrate inhibiting the agglomeration of Ni nanoparticles. The Ni-based catalysts with high performance at low temperature and high stability prepared by the method used have broad industrial application prospects.

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 Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO2 methanation

2020 ◽  
Vol 10 (12) ◽  
pp. 4061-4071
Author(s):  
Ainhoa Bustinza ◽  
Marina Frías ◽  
Yuefeng Liu ◽  
Enrique García-Bordejé
Keyword(s):  
Pressure Drop ◽  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Space Velocity ◽  
Low Pressure ◽  
Metal Catalysts ◽  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
High Space ◽  
High Space Velocity

A bimetallic catalyst consisting of Ni nanoparticles interspersed with atomic Ru on alumina coated monolith afforded higher activity than other mono and bimetallic catalysts in CO2 methanation, providing low pressure drop at high space velocity.

scholarly journals Tunable colloidal Ni nanoparticles confined and redistributed in mesoporous silica for CO2 methanation

2019 ◽  
Vol 9 (10) ◽  
pp. 2578-2591 ◽  
Author(s):  
Wilbert L. Vrijburg ◽  
Jolanda W. A. van Helden ◽  
Arno J. F. van Hoof ◽  
Heiner Friedrich ◽  
Esther Groeneveld ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
Hydrogenation Catalysts ◽  
Seed Mediated

Colloidal Ni nanoparticles were prepared using seed-mediated strategies and encapsulated in mesoporous silica to yield stable and sinter-resistant hydrogenation catalysts.

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