Ceria-promoted Co@NC catalyst for biofuel upgrade: synergy between ceria and cobalt species

2021 ◽  
Vol 9 (13) ◽  
pp. 8541-8553
Author(s):  
Bowei Wang ◽  
Ruixiao Gao ◽  
Dan Zhang ◽  
Yuyao Zeng ◽  
Fangying Zhang ◽  
...  
Keyword(s):  
Cobalt Species

Ceria is introduced to promote the activity of Co@NC. HDO of vanillin can be catalyzed by Co/Ce@NC either using H2 or ethanol as the H donor.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Position and Lewis acidic property of active cobalt species on MFI zeolite for catalytic methylation of benzene with methane

2021 ◽  
Vol 310 ◽  
pp. 110649
Author(s):  
Hitoshi Matsubara ◽  
Kana Yamamoto ◽  
Etsushi Tsuji ◽  
Kazu Okumura ◽  
Koshiro Nakamura ◽  
...  
Keyword(s):  
Acidic Property ◽  
Mfi Zeolite ◽  
Cobalt Species

scholarly journals Co(O)x Particles in Polymeric N-Doped Carbon Nanotube Applied for Photocatalytic H2 or Electrocatalytic O2 Evolution

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1836
Author(s):  
Xiaoxue Zheng ◽  
Ke Liu ◽  
Lichao Chen ◽  
Hengxiao He ◽  
Lusheng Chen ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Visible Light ◽  
H2 Production ◽  
O2 Evolution ◽  
High Catalytic Activity ◽  
Good Activity ◽  
Two Dimensional ◽  
Porous Composite ◽  
O2 Production ◽  
Cobalt Species

A new way for synthesizing porous composite with cobalt species and N-doped carbon nanotubes (NDCNTs) was reported here by using cobalt salts and melamine mixtures as precursor. The Co(O)x/NDCNTs exhibited good activity of electrocatalytic O2 production. Furthermore, after reduced by H2, the Co–NDCNTs showed strong absorption of visible light and high catalytic activity of H2 production, which is 598.5 μmol g−1 h−1 under the visible light (λ > 420 nm). The results suggested that supramolecular preorganization of melamine monomers may be a promising method of synthesizing two-dimensional N-doped carbon nanotube with Co particles in it. The morphologies should be beneficial for the charge transport and separation. This work can encourage further synthesize new efficient noble-metal-free photocatalysts or electrocatalysts.

Effects of annealing conditions on the oxygen evolution activity of a BaTaO2N photocatalyst loaded with cobalt species

2020 ◽  
Vol 354 ◽  
pp. 204-210 ◽  
Author(s):  
Hiroya Okamoto ◽  
Masanori Kodera ◽  
Takashi Hisatomi ◽  
Masao Katayama ◽  
Tsutomu Minegishi ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Annealing Conditions ◽  
Cobalt Species

The nature of cobalt species in carbon nanotubes and their catalytic performance in Fischer–Tropsch reaction

2009 ◽  
Vol 19 (48) ◽  
pp. 9241 ◽  
Author(s):  
Hui Zhang ◽  
Christine Lancelot ◽  
Wei Chu ◽  
Jingping Hong ◽  
Andrei Y. Khodakov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Performance ◽  
Fischer Tropsch ◽  
Cobalt Species
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