Methanol formation by catalytic hydrogenation of CO2 on a nitrogen doped zinc oxide surface: an evaluative study on the mechanistic pathway by density functional theory

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60524-60533 ◽  
Author(s):  
Ramasamy Shanmugam ◽  
Arunachalam Thamaraichelvan ◽  
Balasubramanian Viswanathan
Keyword(s):  
Density Functional ◽  
Reaction Pathway ◽  
Oxide Surface ◽  
Functional Theory ◽  
Nitrogen Doped ◽  
Evaluative Study ◽  
Mechanistic Pathway ◽  
Computational Evaluation ◽  
Methanol Formation ◽  
Simultaneous Activation

Computational evaluation of reaction pathway for simultaneous activation of CO2 and water on N doped ZnO surface revealed carbamate mediated methanol formation.

Graph theory-based reaction pathway searches and DFT calculations for the mechanism studies of free radical-initiated peptide sequencing mass spectrometry (FRIPS MS): a model gas-phase reaction of GGR tri-peptide

2020 ◽  
Vol 22 (9) ◽  
pp. 5057-5069 ◽  
Author(s):  
Jae-ung Lee ◽  
Yeonjoon Kim ◽  
Woo Youn Kim ◽  
Han Bin Oh
Keyword(s):  
Graph Theory ◽  
Dft Calculations ◽  
Gas Phase ◽  
Density Functional ◽  
Reaction Pathway ◽  
Peptide Sequencing ◽  
Phase Reaction ◽  
Functional Theory ◽  
Fragmentation Mechanisms ◽  
Gas Phase Fragmentation

A new approach for elucidating gas-phase fragmentation mechanisms is proposed: graph theory-based reaction pathway searches (ACE-Reaction program) and density functional theory (DFT) calculations.

COMPLEX DONORS IN NITROGEN-DOPED DIAMOND

2004 ◽  
Vol 03 (04n05) ◽  
pp. 455-461
Author(s):  
YING DAI ◽  
ANYI LI ◽  
YING ZHANG ◽  
SHENGHAO HAN
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Shallow Donor ◽  
Dangling Bond ◽  
Single Vacancy ◽  
Functional Theory ◽  
Nitrogen Doped ◽  
Ultrananocrystalline Diamond ◽  
Cluster Methods ◽  
Donor Character

Several Nitrogen (N)-hydrogen(H), N-dangling bond (DB) and N-single vacancy (V) complexes as the possible donor centers in diamond have been investigated using both supercell and cluster methods within the frame of density functional theory. We have found that the H—N—N—H complex exhibits shallower donor character than that of the N—H—N center discussed by Miyazaki et al.1 and it is one of the possible effective shallow donor centers in crystalline diamond. We conclude that the N—V related complex demonstrates a character of shallow donors and it should be one of the possible donor centers for the ultrananocrystalline diamond (UNCD) films, which are responsible for the n-type high conductivity of these films.

Synthesis of novel N-functionalized 4-aryl-tetrahydrobiquinoline-2,5-(1H,3H)-diones via one-pot three-component reaction: a joint experimental and computational study

2018 ◽  
Vol 96 (12) ◽  
pp. 1071-1078
Author(s):  
Vahideh Zadsirjan ◽  
Sayyed Jalil Mahdizadeh ◽  
Majid M. Heravi ◽  
Masumeh Heydari
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Computational Study ◽  
Reaction Pathway ◽  
Deep Insight ◽  
One Pot ◽  
Functional Theory ◽  
Three Component Reaction ◽  
High Yields ◽  
Mechanism Of The Reaction

A novel series of N-functionalized 4-aryl-tetrahydrobiquinoline-2,5-(1H,3H)-diones were synthesized in high yields by a one-pot three-component reaction involving 2-chloroquinoline-3-carbaldehydes, Meldrum’s acid, and enaminones (dimedone-based enaminones) in the presence of K2CO3 in CH3CN under reflux condition. To gain a deep insight on the mechanism of the reaction, an extensive series of quantum mechanics calculations in the framework of density functional theory (DFT) were carried out for supporting the suggested reaction pathway.

Methanol carbonylation to acetaldehyde on Au particles supported by single-layer MoS2 grown on silica

2021 ◽  
Vol 34 (10) ◽  
pp. 104005
Author(s):  
Kortney Almeida ◽  
Katerina Chagoya ◽  
Alan Felix ◽  
Tao Jiang ◽  
Duy Le ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Density Functional ◽  
Ostwald Ripening ◽  
Reaction Pathway ◽  
Single Layer ◽  
Process Conditions ◽  
Higher Alcohols ◽  
Low Carbon ◽  
Functional Theory ◽  
Supported Gold

Abstract Homogenous single-layer MoS2 films coated with sub-single layer amounts of gold are found to isolate the reaction of methanol with carbon monoxide, the fundamental step toward higher alcohols, from an array of possible surface reactions. Active surfaces were prepared from homogenous single-layer MoS2 films coated with sub-single layer amounts of gold. These gold atoms formed clusters on the MoS2 surface. A gas mixture of carbon monoxide (CO) and methanol (CH3OH) was partially converted to acetaldehyde (CH3CHO) under mild process conditions (308 kPa and 393 K). This carbonylation of methanol to a C2 species is a critical step toward the formation of higher alcohols. Density functional theory modeling of critical steps of the catalytic process identify a viable reaction pathway. Imaging and spectroscopic methods revealed that the single layer of MoS2 facilitated formation of nanoscale gold islands, which appear to sinter through Ostwald ripening. The formation of acetaldehyde by the catalytic carbonylation of methanol over supported gold clusters is an important step toward realizing controlled production of useful molecules from low carbon-count precursors.

Electronic properties of N-rich graphene nano-chevrons.

2021 ◽  
Author(s):  
Anderson Soares da Costa Azevêdo ◽  
Aldilene Saraiva-Souza ◽  
Vincent Meunier ◽  
Eduardo Costa Girão
Keyword(s):  
Density Functional Theory ◽  
Magnetic Properties ◽  
Theoretical Analysis ◽  
Electronic Properties ◽  
Density Functional ◽  
Functional Theory ◽  
Nitrogen Doped ◽  
Electronic And Magnetic Properties ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Theoretical analysis based on density functional theory is used to describe the microscopic origins of emerging electronic and magnetic properties in quasi-1D nitrogen-doped graphene nanoribbon structures with chevron-like (or wiggly-edged)...

scholarly journals A DFT investigation of the mechanisms of CO2 and CO methanation on Fe (111)

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Caroline R. Kwawu ◽  
Albert Aniagyei ◽  
Richard Tia ◽  
Evans Adei
Keyword(s):  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Environmentally Benign ◽  
Methane Formation ◽  
Functional Theory ◽  
Co Methanation ◽  
Detailed Mechanism ◽  
Catalytic Surfaces ◽  
Methanol Formation ◽  
Spin Polarized

AbstractInsight into the detailed mechanism of the Sabatier reaction on iron is essential for the design of cheap, environmentally benign, efficient and selective catalytic surfaces for CO2 reduction. Earlier attempts to unravel the mechanism of CO2 reduction on pure metals including inexpensive metals focused on Ni and Cu; however, the detailed mechanism of CO2 reduction on iron is not yet known. We have, thus, explored with spin-polarized density functional theory calculations the relative stabilities of intermediates and kinetic barriers associated with methanation of CO2 via the CO and non-CO pathways on the Fe (111) surface. Through the non-CO (formate) pathway, a dihydride CO2 species (H2CO2), which decomposes to aldehyde (CHO), is further hydrogenated into methoxy, methanol and then methane. Through the CO pathway, it is observed that the CO species formed from dihydroxycarbene is not favorably decomposed into carbide (both thermodynamically and kinetically challenging) but CO undergoes associative hydrogenation to form CH2OH which decomposes into CH2, leading to methane formation. Our results show that the transformation of CO2 to methane proceeds via the CO pathway, since the barriers leading to alkoxy transformation into methane are high via the non-CO pathway. Methanol formation is more favored via the non-CO pathway. Iron (111) shows selectivity towards CO methanation over CO2 methanation due to differences in the rate-determining steps, i.e., 91.6 kJ mol−1 and 146.2 kJ mol−1, respectively.

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