scholarly journals Cation-exchanged zeolites for the selective oxidation of methane to methanol

2018 ◽  
Vol 8 (1) ◽  
pp. 114-123 ◽  
Author(s):  
Ambarish R. Kulkarni ◽  
Zhi-Jian Zhao ◽  
Samira Siahrostami ◽  
Jens K. Nørskov ◽  
Felix Studt
Keyword(s):  
Transition Metal ◽  
Selective Oxidation ◽  
Metal Cation ◽  
Active Site ◽  
Methane Activation ◽  
Transition Metal Cation ◽  
Trade Off ◽  
Oxidation Of Methane ◽  
Active Site Motif

Development of an ideal methane activation catalyst presents a trade-off between stability and reactivity of the active site that can be achieved by tuning the transition metal cation, active site motif and the zeolite topology.

scholarly journals Approaches for Selective Oxidation of Methane to Methanol

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 194 ◽  
Author(s):  
Richa Sharma ◽  
Hilde Poelman ◽  
Guy B. Marin ◽  
Vladimir V. Galvita
Keyword(s):  
Selective Oxidation ◽  
Active Site ◽  
Density Functional ◽  
Spectroscopic Studies ◽  
Methane Activation ◽  
Chemical Looping ◽  
Intermediate Species ◽  
Functional Theory ◽  
Oxidation Of Methane ◽  
Industrial Standards

Methane activation chemistry, despite being widely reported in literature, remains to date a subject of debate. The challenges in this reaction are not limited to methane activation but extend to stabilization of the intermediate species. The low C-H dissociation energy of intermediates vs. reactants leads to CO2 formation. For selective oxidation, nature presents methane monooxygenase as a benchmark. This enzyme selectively consumes methane by breaking it down into methanol. To assemble an active site similar to monooxygenase, the literature reports Cu-ZSM-5, Fe-ZSM-5, and Cu-MOR, using zeolites and systems like CeO2/Cu2O/Cu. However, the trade-off between methane activation and methanol selectivity remains a challenge. Density functional theory (DFT) calculations and spectroscopic studies indicate catalyst reducibility, oxygen mobility, and water as co-feed as primary factors that can assist in enabling higher selectivity. The use of chemical looping can further improve selectivity. However, in all systems, improvements in productivity per cycle are required in order to meet the economical/industrial standards.

Splitting dioxygen over distant binuclear transition metal cationic sites in zeolites. Effect of the transition metal cation

2021 ◽  
Author(s):  
Jiri Dedecek ◽  
Edyta Tabor ◽  
Prokopis C. Andrikopoulos ◽  
Stepan Sklenak
Keyword(s):  
Transition Metal ◽  
Metal Cation ◽  
Transition Metal Cation

Impact of trace extrinsic defect formation on the local symmetry transition in spinel LiNi0.5Mn1.5O4−δ systems and their electrochemical characteristics

2018 ◽  
Vol 6 (45) ◽  
pp. 22749-22757 ◽  
Author(s):  
Hiromasa Shiiba ◽  
Nobuyuki Zettsu ◽  
Satoru Kida ◽  
Dae-wook Kim ◽  
Katsuya Teshima
Keyword(s):  
Transition Metal ◽  
Metal Cation ◽  
Electronic Structures ◽  
Defect Formation ◽  
Local Symmetry ◽  
Electrochemical Characteristics ◽  
Transition Metal Cation ◽  
Extrinsic Defect

Many fundamental studies have been conducted on the electrochemical and electronic structures in transition metal cation-substituted LiNi0.5Mn1.5O4 systems.

Solid-state reaction as a way to transition metal cation introduction into high-silica zeolites

1994 ◽  
Vol 90 (3) ◽  
pp. 323-354 ◽  
Author(s):  
Alexei V. Kucherov ◽  
Alexei A. Slinkin
Keyword(s):  
Solid State ◽  
Transition Metal ◽  
Metal Cation ◽  
Solid State Reaction ◽  
Transition Metal Cation ◽  
High Silica ◽  
High Silica Zeolites

LiPF6 Stabilizer and Transition-Metal Cation Scavenger: A Bifunctional Bipyridine-Based Ligand for Lithium-Ion Battery Application

2019 ◽  
Vol 31 (11) ◽  
pp. 4025-4033 ◽  
Author(s):  
Hao Jia ◽  
Bastian Billmann ◽  
Hitoshi Onishi ◽  
Jens Smiatek ◽  
Stephan Roeser ◽  
...  
Keyword(s):  
Transition Metal ◽  
Lithium Ion Battery ◽  
Metal Cation ◽  
Lithium Ion ◽  
Transition Metal Cation ◽  
Battery Application

Insight into the active site and reaction mechanism for selective oxidation of methane to methanol using H2O2 on a Rh1/ZrO2 catalyst

2020 ◽  
Vol 44 (4) ◽  
pp. 1632-1639 ◽  
Author(s):  
Qi Zhao ◽  
Bing Liu ◽  
Yuebing Xu ◽  
Feng Jiang ◽  
Xiaohao Liu
Keyword(s):  
Reaction Mechanism ◽  
Selective Oxidation ◽  
Active Site ◽  
Oxidation Of Methane ◽  
Methanol Formation ◽  
Zro2 Catalyst ◽  
Insight Into

Five-coordinated Rh leads to the over-oxidation of CH4, while four-coordinated Rh stabilizes CH3 and facilitates methanol formation via the CH3OOH intermediate.

Gas sorption and transition-metal cation separation with a thienothiophene based zirconium metal–organic framework

2015 ◽  
Vol 232 ◽  
pp. 221-227 ◽  
Author(s):  
Mostakim SK ◽  
Maciej Grzywa ◽  
Dirk Volkmer ◽  
Shyam Biswas
Keyword(s):  
Transition Metal ◽  
Metal Cation ◽  
Metal Organic Framework ◽  
Transition Metal Cation ◽  
Gas Sorption ◽  
Metal Organic ◽  
Zirconium Metal ◽  
Organic Framework
Sign in / Sign up

Export Citation Format

Share Document