Cu oxo nanoclusters for direct oxidation of methane to methanol: formation, structure and catalytic performance

2020 ◽  
Vol 10 (21) ◽  
pp. 7124-7141
Author(s):  
Lei Tao ◽  
Insu Lee ◽  
Maricruz Sanchez-Sanchez
Keyword(s):  
Catalytic Performance ◽  
Direct Oxidation ◽  
The Past ◽  
Selective Conversion ◽  
Oxidation Of Methane ◽  
Methanol Formation ◽  
Conversion Of Methane ◽  
Microporous Solids

Cu oxo nanoclusters hosted in microporous solids have emerged in the past decades as promising materials for catalyzing the selective conversion of methane to methanol.

Revealing the effect of N-content in Fe doped graphene on its catalytic performance for direct oxidation of methane to methanol

2020 ◽  
Vol 527 ◽  
pp. 146833 ◽  
Author(s):  
Thantip Roongcharoen ◽  
Sarawoot Impeng ◽  
Nawee Kungwan ◽  
Supawadee Namuangruk
Keyword(s):  
Catalytic Performance ◽  
Direct Oxidation ◽  
N Content ◽  
Oxidation Of Methane ◽  
Doped Graphene

Selective Methanol Formation via CO-Assisted Direct Partial Oxidation of Methane over Copper Containing CHA-type Zeolites Prepared by One-pot Synthesis

2021 ◽  
Author(s):  
Sibel Sogukkanli ◽  
Takahiko Moteki ◽  
Masaru Ogura
Keyword(s):  
Partial Oxidation ◽  
Direct Conversion ◽  
Partial Oxidation Of Methane ◽  
One Pot ◽  
One Pot Synthesis ◽  
Oxidation Of Methane ◽  
Methanol Formation ◽  
Conversion Of Methane ◽  
Direct Partial Oxidation

Catalytic CO-assisted direct conversion of methane into methanol was demonstrated over Cu-CHA zeolites. Methanol was selectively produced as a solo oxygenate product. The results suggested the necessity of low copper...

scholarly journals OXIDATIVE CONVERSION OF METHANE OVER ReOX/ALUMINA CATALYSTS

2017 ◽  
Vol 60 (8) ◽  
pp. 65
Author(s):  
Etibar H. Ismailov ◽  
Sevinj N. Osmanova ◽  
Ulviya A. Kerimova
Keyword(s):  
High Temperature ◽  
Unpaired Electron ◽  
Esr Spectra ◽  
Oxidative Conversion ◽  
Direct Oxidation ◽  
Oxide Structure ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Oxidative Conversion Of Methane ◽  
Alumina Catalysts

ReOx/alumina samples have been studied as catalysts for the oxidative conversion of methane. It was shown that the reaction of methane with an oxidized and then evacuated at this temperature (973 K, 1 h) samples leads to the formation of primarily C2H6, C2H4 and CO2, and then only CO and C6H6. The formation of ethane and ethylene in the initial stage of the reaction of methane with ReOx / alumina samples is the result of the reaction of oxidative condensation of methane with the formation of ethane, followed by its dehydrogenation to ethylene. The reaction proceeds with the participation of O-• ion-radical type (V-type defect) centers of the ReOx / aluminum-oxide structure (CH4 + [O-•] = CH3• + OH-, 2CH3• = C2H6). CO2 is formed by the oxidation of methane with surface oxygen forms (O22- and / and O2-•) oxide structure. Direct oxidation of methane to methanol and further splitting of the latter to CO and H2 in our case are not excluded: CH4 + ReOx/Al2O3 = CO + 2H2 + ReOx-1/Al2O3. It was shown that catalysts preliminarily oxidized at 973 K for 1 h in oxygen and then evacuated at the same temperature for 1 h are characterized by ESR spectra belonging to the paramagnetic Re6+ ion with 5d1 unpaired electron and strong Re=O bond. The ESR spectra of this ion are characterized by a hyperfine structure (A║ = 48.3 mT) due to the interaction of an unpaired electron with 185.187Re magnetic nuclei having the spin of I = 5/2 and are easily observed at room temperature for all samples. The ESR signals of these centers disappear after the interaction of samples evacuated at high temperature (973 K) with methane. It was shown that high-temperature contact of this sample with methane leads to the formation of centers that catalyze the oxidative dehydrocyclization of methane. The degree of oxidation of rhenium ions in these samples is less than 6+, and these ions are coordinatively unsaturated. To maintain the activity of the catalyst, its regeneration is required. Activation of the catalyst is achieved by short-term heat treatment in oxygen flow followed by purging with an inert gas (nitrogen, argon). Forcitation:Ismailov E.H., Osmanova S.N., Kerimova U.A. Oxidative conversion of methane over ReOx/Alumina catalysts. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 8. P. 65-69.

scholarly journals Copper Phyllosilicates-Derived Catalysts in the Production of Alcohols from Hydrogenation of Carboxylates, Carboxylic Acids, Carbonates, Formyls, and CO2: A Review

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 255
Author(s):  
Dien-Thien To ◽  
Yu-Chuan Lin
Keyword(s):  
Carboxylic Acids ◽  
Catalytic Performance ◽  
Spatial Effect ◽  
Synthesis Methods ◽  
The Past ◽  
Surface Areas ◽  
Preparation Conditions ◽  
Remedial Actions ◽  
The Stability ◽  
Size Interaction

Copper phyllosilicates-derived catalysts (CuPS-cats) have been intensively explored in the past two decades due to their promising activity in carbonyls hydrogenation. However, CuPS-cats have not been completely reviewed. This paper focuses on the aspects concerning CuPS-cats from synthesis methods, effects of preparation conditions, and dopant to catalytic applications of CuPS-cats. The applications of CuPS-cats include the hydrogenation of carboxylates, carboxylic acids, carbonates, formyls, and CO2 to their respective alcohols. Besides, important factors such as the Cu dispersion, Cu+ and Cu0 surface areas, particles size, interaction between Cu and supports and dopants, morphologies, and spatial effect on catalytic performance of CuPS-cats are discussed. The deactivation and remedial actions to improve the stability of CuPS-cats are summarized. It ends up with the challenges and prospective by using this type of catalyst.

Dioxygen splitting at room temperature over distant binuclear transition metal centers in zeolites for direct oxidation of methane to methanol

2021 ◽  
Author(s):  
Kinga Mlekodaj ◽  
Mariia Lemishka ◽  
Stepan Sklenak ◽  
Jiri Dedecek ◽  
Edyta Tabor
Keyword(s):  
Transition Metal ◽  
Room Temperature ◽  
Direct Oxidation ◽  
Metal Centers ◽  
Oxidation Of Methane ◽  
First Time

Here we demonstrate for the first time the splitting of dioxygen at RT over distant binuclear transition metal (M = Ni, Mn, and Co) centers stabilized in ferrierite zeolite. Cleaved...

Pyrolysis of Methane to Higher Hydrocarbons: A Thermodynamic Study

1989 ◽  
Vol 42 (10) ◽  
pp. 1655 ◽  
Author(s):  
FP Larkins ◽  
AZ Khan
Keyword(s):  
Gas Phase ◽  
Pressure Range ◽  
Solid Carbon ◽  
Free Energies ◽  
Oxidation Of Methane ◽  
Conversion Of Methane ◽  
Equilibrium Conversion ◽  
Benzene Toluene ◽  
Higher Hydrocarbons ◽  
The Individual

Some basic thermodynamic parameters such as Gibbs free energies, enthalpies of reactions and equilibrium compositions of products from the pyrolysis and partial oxidation of methane to higher hydrocarbons in the gas phase have been determined within a consistent framework for the temperature range 800-1500 K and the pressure range 0.1-3 MPa , by using the CSIRO-SGTE THERMODATA system. It has been established that the pyrolysis of methane to higher hydrocarbons, e.g. acetylene, ethylene, ethane, prop-1-ene, propane, benzene, toluene, naphthalene, 1-methylnaphthalene and 2-methylnaphthalene, considered as separate reactions, is a highly endothermic reaction with the Gibbs free energies for the individual reactions being positive until 1300 K. The aromatics are thermodynamically most favoured with the equilibrium yields increasing with temperature. Addition of O2 lowers the heats of synthesis and the free energies for methane conversion but no enhancement in the equilibrium yields of hydrocarbons is observed. When solid carbon is allowed, it is the dominant product in all cases with the equilibrium yields for all hydrocarbons becoming negligible. Increasing the pressure at a particular temperature has more effect on the lowering of the equilibrium conversion of methane than on the suppression of solid carbon. Such data are valuable for understanding the conversion limits for methane into higher hydrocarbons.

scholarly journals Perspective tendencies in development of small scale processing of gas resources

2017 ◽  
Vol 89 (8) ◽  
pp. 1033-1047 ◽  
Author(s):  
Vladimir S. Arutyunov ◽  
Valery I. Savchenko ◽  
Igor V. Sedov ◽  
Alexey V. Nikitin ◽  
Ilya G. Fokin ◽  
...  
Keyword(s):  
Value Added ◽  
Small Scale ◽  
Oxidative Conversion ◽  
Direct Oxidation ◽  
Hydrocarbon Gases ◽  
Associated Petroleum Gas ◽  
Syngas Production ◽  
Oxidation Of Methane ◽  
Alternative Routes

AbstractThis paper analyses alternative routes for production of chemicals from different hydrocarbon gases by their direct, without syngas production, oxidative conversion to oxygenates or ethylene. Main of these routes are direct oxidation of methane to methanol (DMTM) and selective oxy-cracking of heavier natural or associated petroleum gas components which can be used for production of high value-added petrochemicals (in combination with carbonylation processes) and fuel gases, useful for gas piston engines. The advantages and practical capabilities of such technologies are discussed.

Syngas formation by direct oxidation of methane

2000 ◽  
Vol 61 (1-4) ◽  
pp. 55-64 ◽  
Author(s):  
G Veser ◽  
J Frauhammer ◽  
U Friedle
Keyword(s):  
Direct Oxidation ◽  
Oxidation Of Methane
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