Effect of Ce and La dopants in Co3O4 nanorods on the catalytic activity of CO and C3H6 oxidation

2019 ◽  
Vol 9 (5) ◽  
pp. 1165-1177 ◽  
Author(s):  
Ping Li ◽  
Xiaoyin Chen ◽  
Lei Ma ◽  
Adarsh Bhat ◽  
Yongdan Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Structural Properties ◽  
Surface Reaction ◽  
Lattice Oxygen ◽  
Adsorbed Oxygen ◽  
Reaction Intermediates ◽  
C3h6 Oxidation ◽  
Co3o4 Nanorods

The catalytic activity is enhanced by Ce but inhibited by La dopant. The catalysts have been characterized in light of structural properties, reducibility, mobility of adsorbed oxygen and lattice oxygen, and surface reaction intermediates.

scholarly journals Role of CO2 During Oxidative Dehydrogenation of Propane Over Bulk and Activated-Carbon Supported Cerium and Vanadium Based Catalysts

2021 ◽  
Author(s):  
Petar Djinović ◽  
Janez Zavašnik ◽  
Janvit Teržan ◽  
Ivan Jerman
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Oxidative Dehydrogenation ◽  
Active Phase ◽  
Lattice Oxygen ◽  
Chemisorbed Oxygen ◽  
Catalytically Active ◽  
Temperature Programmed ◽  
Propane Cracking

AbstractCeO2, V2O5 and CeVO4 were synthesised as bulk oxides, or deposited over activated carbon, characterized by XRD, HRTEM, CO2-TPO, C3H8-TPR, DRIFTS and Raman techniques and tested in propane oxidative dehydrogenation using CO2. Complete oxidation of propane to CO and CO2 is favoured by lattice oxygen of CeO2. The temperature programmed experiments show the ~ 4 nm AC supported CeO2 crystallites become more susceptible to reduction by propane, but less prone to re-oxidation with CO2 compared to bulk CeO2. Catalytic activity of CeVO4/AC catalysts requires a 1–2 nm amorphous CeVO4 layer. During reaction, the amorphous CeVO4 layer crystallises and several atomic layers of carbon cover the CeVO4 surface, resulting in deactivation. During reaction, V2O5 is irreversibly reduced to V2O3. The lattice oxygen in bulk V2O5 favours catalytic activity and propene selectivity. Bulk V2O3 promotes only propane cracking with no propene selectivity. In VOx/AC materials, vanadium carbide is the catalytically active phase. Propane dehydrogenation over VC proceeds via chemisorbed oxygen species originating from the dissociated CO2. Graphic Abstract

scholarly journals Electrical Promotion-Assisted Automotive Exhaust Catalyst: Highly Active and Selective NO Reduction to N2 at Low-Temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Lattice Oxygen ◽  
Pd Catalyst ◽  
Highly Active ◽  
Automotive Exhaust Catalyst ◽  
Activated Surface

Pd catalyst (Pd/Ce<sub>0.7</sub>Zr<sub>0.3</sub>O<sub>2</sub>) in an electric field exhibits extremely high three-way catalytic activity (TWC: NO-C<sub>3</sub>H<sub>6</sub>-CO-O<sub>2</sub>-H<sub>2</sub>O). By applying an electric field to the semiconductor catalyst, low-temperature operation of TWC can be achieved even at 473 K by virtue of the activated surface-lattice oxygen.

Plasma-chemical promotion of catalysis for CH4 dry reforming: unveiling plasma-enabled reaction mechanisms

2020 ◽  
Vol 22 (34) ◽  
pp. 19349-19358
Author(s):  
Zunrong Sheng ◽  
Hyun-Ha Kim ◽  
Shuiliang Yao ◽  
Tomohiro Nozaki
Keyword(s):  
Reaction Mechanisms ◽  
Surface Reaction ◽  
Dry Reforming ◽  
Adsorbed Oxygen ◽  
Oxygen Species ◽  
Plasma Chemical ◽  
Vibrationally Excited ◽  
Adsorbed Oxygen Species ◽  
Carbonate Species

Abundant carbonate species are generated over lanthanum by vibrationally excited CO2, which increase adsorbed oxygen species fixation for surface reaction.

scholarly journals Understanding the formation of bulk- and surface-active layered (oxy)hydroxides for water oxidation starting from a cobalt selenite precursor

2020 ◽  
Vol 13 (10) ◽  
pp. 3607-3619
Author(s):  
Jan Niklas Hausmann ◽  
Stefan Mebs ◽  
Konstantin Laun ◽  
Ingo Zebger ◽  
Holger Dau ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Structural Properties ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Active Oxygen ◽  
Near Surface ◽  
Surface Active

Starting from a cobalt selenite precatalyst, we obtained a bulk and a near-surface active oxygen evolution catalyst and connected their structural properties to the precatalyst structure, the transformation conditions, and the catalytic activity.

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