Lattice oxygen and surface states dual modulation of manganese oxide with remarkably enhanced catalytic activity for toluene oxidation

2021 ◽  
pp. 108680
Author(s):  
Hanyu Zhang ◽  
Liming He ◽  
Xiaohan Zhang ◽  
Yongze Xia ◽  
Jian Qi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Manganese Oxide ◽  
Surface States ◽  
Lattice Oxygen ◽  
Toluene Oxidation

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

Effective toluene oxidation under ozone over mesoporous MnOx/γ-Al2O3 catalyst prepared by solvent deficient method: Effect of Mn precursors on catalytic activity

2021 ◽  
Vol 195 ◽  
pp. 110876
Author(s):  
Kannapu Hari Prasad Reddy ◽  
Beom-Sik Kim ◽  
Su Shiung Lam ◽  
Sang-Chul Jung ◽  
JiHyeon Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Toluene Oxidation ◽  
Method Effect ◽  
Al2o3 Catalyst

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.

Surface Partial-Charge-Tuned Enhancement of Catalytic Activity of Platinum Nanocatalysts for Toluene Oxidation

ACS Catalysis ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 7431-7442 ◽  
Author(s):  
Aolin Lu ◽  
Hanlei Sun ◽  
Nuowei Zhang ◽  
Liming Che ◽  
Shiyao Shan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Charge ◽  
Toluene Oxidation

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.

Low-valence or tetravalent cation doping of manganese oxide octahedral molecular sieve (K-OMS-2) materials for nitrogen oxide emission abatement

2019 ◽  
Vol 9 (15) ◽  
pp. 4108-4117 ◽  
Author(s):  
Xiaomin Wu ◽  
Xiaolong Yu ◽  
Ziyi Chen ◽  
Zhiwei Huang ◽  
Guohua Jing
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancy ◽  
Manganese Oxide ◽  
Nitrogen Oxide ◽  
Molecular Sieve ◽  
Oxide Catalysts ◽  
Nitrogen Oxide Emission ◽  
Vacancy Defects ◽  
Cation Doping ◽  
Tetravalent Cation

Substitutionally doped oxide catalysts with abundant oxygen vacancy defects (OVDs) can effectively improve the catalytic activity efficiency.

Catalytic Activity of Manganese Oxide Anchored on to Alumina and Zirconia for the Synthesis of Dihydropyrimidinones: Role of Acidity, Crystal Phase and Morphology

2014 ◽  
Vol 3 (1) ◽  
pp. 88-102 ◽  
Author(s):  
Mahadevaiah Rekha ◽  
Hagalahalli Hareesh ◽  
Nagaraju Kathyayini ◽  
Narasimaiah Nagaraju
Keyword(s):  
Catalytic Activity ◽  
Manganese Oxide ◽  
Crystal Phase

Diameter-dependent catalytic activity of ceria nanorods with various aspect ratios for toluene oxidation

2014 ◽  
Vol 256 ◽  
pp. 439-447 ◽  
Author(s):  
Yinnian Liao ◽  
Lifang He ◽  
Changgeng Man ◽  
Limin Chen ◽  
Mingli Fu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Toluene Oxidation ◽  
Aspect Ratios

Catalytic Activity of Supported Platinum and Metal Oxide Catalysts for Toluene Oxidation

2009 ◽  
Vol 52 (5) ◽  
pp. 517-527 ◽  
Author(s):  
Saleh M. Saqer ◽  
Dimitris I. Kondarides ◽  
Xenophon E. Verykios
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Oxide Catalysts ◽  
Metal Oxide Catalysts ◽  
Toluene Oxidation ◽  
Supported Platinum
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