Preparation of high-surface-area Ni/α-Al2O3 catalysts for improved CO methanation

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7539-7546 ◽  
Author(s):  
Youjun Liu ◽  
Jiajian Gao ◽  
Qing Liu ◽  
Fangna Gu ◽  
Xiaopeng Lu ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Good Activity ◽  
Co Methanation ◽  
Α Al2o3

High-surface-area Ni/α-Al2O3 catalysts exhibit good activity, stability and coking-resistance because the high-surface-area support is favorable to the dispersion of Ni.

Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation

RSC Advances ◽  
2013 ◽  
Vol 3 (39) ◽  
pp. 18156 ◽  
Author(s):  
Jiajian Gao ◽  
Chunmiao Jia ◽  
Meiju Zhang ◽  
Fangna Gu ◽  
Guangwen Xu ◽  
...  
Keyword(s):  
Surface Area ◽  
Nickel Catalyst ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Co Methanation ◽  
Barium Hexaaluminate

scholarly journals High surface area, amorphous titania with reactive Ti3+ through a photo-assisted synthesis method for photocatalytic H2 generation

2017 ◽  
Vol 5 (22) ◽  
pp. 10957-10967 ◽  
Author(s):  
Dennis Zywitzki ◽  
Hangkun Jing ◽  
Harun Tüysüz ◽  
Candace K. Chan
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Synthesis Method ◽  
Good Activity ◽  
H2 Generation ◽  
Amorphous Titania ◽  
Photocatalytic H2 Generation

A facile approach for the preparation of high surface area, Ti3+ containing titania with good activity for photocatalytic H2 production is reported.

Effects of SiO2-doping on high-surface-area Ru/TiO2 catalysts for the selective CO methanation

2021 ◽  
Vol 282 ◽  
pp. 119483
Author(s):  
Sebastian Cisneros ◽  
Shilong Chen ◽  
Thomas Diemant ◽  
Joachim Bansmann ◽  
Ali M. Abdel-Mageed ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Co Methanation ◽  
Selective Co Methanation

Facile preparation of a Ni/MgAl2O4 catalyst with high surface area: enhancement in activity and stability for CO methanation

2018 ◽  
Vol 41 (3-4) ◽  
pp. 73-89 ◽  
Author(s):  
Shengjia Wang ◽  
Zhiwei Tian ◽  
Qing Liu ◽  
Yingyun Qiao ◽  
Yuanyu Tian
Keyword(s):  
Carbon Black ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Co Methanation ◽  
Co Precipitation ◽  
Spinel Catalysts ◽  
Nickel Species

Abstract To enhance the performance of anti-coking and anti-sintering of the Ni-based catalysts during the reaction process of CO methanation, we synthesized a group of catalysts denoted as “Ni-xMgAl2O4” via the modified co-precipitation method utilizing carbon black as hard template. The addition of carbon black could significantly improve the specific surface area of MgAl2O4 to 235.8 m2 g−1. The Ni catalysts supported on high-surface-area MgAl2O4 (Ni-0.25MA) exhibited enhanced catalytic performance and hydrothermal stability in comparison with the conventional Ni-based magnesia alumina spinel catalysts with the same NiO content. In the process of 120-h stability test, the Ni-0.25MA catalyst exhibited remarkable improvement in both anti-sintering and anti-coking. After a series of characterizations, we found that the addition of carbon black could make more pores over MgAl2O4, resulting in the supported Ni particles being anchored in the pore rather than on the outside surface of support. This structure enhanced the dispersion of nickel nanoparticles, thus strengthening the interaction between nickel species and the MgAl2O4 support, which led to the promotion in catalytic activity and stability of high-surface-area Ni/MgAl2O4.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

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