scholarly journals Experimental and Computational Investigation of Acetic Acid Deoxygenation over Oxophilic Molybdenum Carbide: Surface Chemistry and Active Site Identity

ACS Catalysis ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1181-1197 ◽  
Author(s):  
Joshua A. Schaidle ◽  
Jeffrey Blackburn ◽  
Carrie A. Farberow ◽  
Connor Nash ◽  
K. Xerxes Steirer ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Surface Chemistry ◽  
Active Site ◽  
Molybdenum Carbide ◽  
Computational Investigation

scholarly journals Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

10.3791/55314 ◽  
2017 ◽  
Author(s):  
Connor P. Nash ◽  
Carrie A. Farberow ◽  
Jesse E. Hensley
Keyword(s):  
Acetic Acid ◽  
Molybdenum Carbide ◽  
Temperature Programmed

scholarly journals Active Site and Electronic Structure Elucidation of Pt Nanoparticles Supported on Phase-Pure Molybdenum Carbide Nanotubes

2017 ◽  
Vol 9 (11) ◽  
pp. 9815-9822 ◽  
Author(s):  
Shuai Tan ◽  
Lucun Wang ◽  
Shibely Saha ◽  
Rebecca R Fushimi ◽  
Dongmei Li
Keyword(s):  
Electronic Structure ◽  
Active Site ◽  
Structure Elucidation ◽  
Molybdenum Carbide ◽  
Pt Nanoparticles ◽  
Pure Molybdenum ◽  
Phase Pure

Surface chemistry of acetic acid on clean and oxygen-covered Pd(100)

2008 ◽  
Vol 602 (2) ◽  
pp. 416-423 ◽  
Author(s):  
Zhenjun Li ◽  
Feng Gao ◽  
W.T. Tysoe
Keyword(s):  
Acetic Acid ◽  
Surface Chemistry

Computational Investigation of the Role of Active Site Heterogeneity for a Supported Organovanadium(III) Hydrogenation Catalyst

ACS Catalysis ◽  
2021 ◽  
pp. 7257-7269
Author(s):  
Prajay Patel ◽  
Robert H. Wells ◽  
David M. Kaphan ◽  
Massimiliano Delferro ◽  
Rex T. Skodje ◽  
...  
Keyword(s):  
Active Site ◽  
Hydrogenation Catalyst ◽  
Computational Investigation ◽  
Site Heterogeneity

Acetic acid hydrodeoxygenation on molybdenum carbide catalysts

2018 ◽  
Vol 8 (11) ◽  
pp. 2938-2953 ◽  
Author(s):  
Anurag Kumar ◽  
Sohan Phadke ◽  
Aditya Bhan
Keyword(s):  
Acetic Acid ◽  
Hydrogen Pressure ◽  
Molybdenum Carbide ◽  
Selective Catalyst

Kinetics and site requirements of acetic acid hydrodeoxygenation on molybdenum carbide – a stable and selective catalyst under atmospheric hydrogen pressure.

scholarly journals Double agent indole-3-acetic acid (IAA): Mechanistic analysis of indole-3-acetaldehyde dehydrogenase AldA that synthesizes IAA, an auxin that aids bacterial virulence

2021 ◽  
Author(s):  
Ateek Shah ◽  
Yamini Mathur ◽  
Amrita Hazra
Keyword(s):  
Acetic Acid ◽  
Pseudomonas Syringae ◽  
Active Site ◽  
Industrial Applications ◽  
Active Site Residues ◽  
Innovative Methods ◽  
Mechanistic Analysis ◽  
Double Agent ◽  
Indole 3 Acetic Acid ◽  
Bacterial Plant Pathogen

The large diversity of organisms inhabiting various environmental niches on our planet are engaged in a lively exchange of biomolecules, including nutrients, hormones, and vitamins. In a quest to survive, organisms that we define as pathogens employ innovative methods to extract valuable resources from their host leading to an infection. One such instance is where plant-associated bacterial pathogens synthesize and deploy hormones or their molecular mimics to manipulate the physiology of the host plant. This commentary describes one such specific example - the mechanism of the enzyme AldA, an aldehyde dehydrogenase (ALDH) from the bacterial plant pathogen Pseudomonas syringae which produces the plant auxin hormone indole-3-acetic acid (IAA) by oxidizing the substrate indole-3-acetaldehyde (IAAld) using the cofactor NAD+ (Bioscience Reports, 2020, 40, https://doi.org/10.1042/BSR20202959). Using mutagenesis, enzyme kinetics, and structural analysis, Zhang K. et al., establish that the progress of the reaction hinges on the formation of two distinct conformations of NAD(H) during the reaction course. Additionally, a key mutation in the AldA active site ‘aromatic box’ changes the enzyme’s preference for an aromatic substrate to an aliphatic one. Our commentary concludes that such molecular level investigations help to establish the nature of the dynamics of NAD(H) in ALDH-catalysed reactions, and further show that key active site residues control substrate specificity. We also contemplate that insights from this study can be used to engineer novel ALDH enzymes for environmental, health and industrial applications.

scholarly journals Effect of metal-doped VPO catalysts for the aldol condensation of acetic acid and formaldehyde to acrylic acid

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 5958-5966 ◽  
Author(s):  
Yumeng Wang ◽  
Yuelin Hou ◽  
Xue Hao ◽  
Zhenlu Wang ◽  
Wanchun Zhu
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Active Site ◽  
Aldol Condensation ◽  
Catalytic Performance ◽  
Moderate Amount ◽  
Vpo Catalysts ◽  
Metal Doped

The acidity of the catalyst is a major factor affecting the catalytic performance of the catalyst. It is presumed that B acid is the main active site of this reaction, and a moderate amount of acid is favorable to facilitate the reaction.

scholarly journals Acetic Acid/Propionic Acid Conversion on Metal Doped Molybdenum Carbide Catalyst Beads for Catalytic Hot Gas Filtration

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 643
Author(s):  
Mi Lu ◽  
Andrew Lepore ◽  
Jae-Soon Choi ◽  
Zhenglong Li ◽  
Zili Wu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Propionic Acid ◽  
Molybdenum Carbide ◽  
Fast Pyrolysis ◽  
Supported Catalyst ◽  
Laboratory Scale ◽  
Gas Filtration ◽  
Hot Gas ◽  
Hot Gas Filtration ◽  
Metal Doped

Catalytic hot gas filtration (CHGF) is used to precondition biomass derived fast pyrolysis (FP) vapors by physically removing reactive char and alkali particulates and chemically converting reactive oxygenates to species that are more easily upgraded during subsequent catalytic fast pyrolysis (CFP). Carboxylic acids, such as acetic acid and propionic acid, form during biomass fast pyrolysis and are recalcitrant to downstream catalytic vapor upgrading. This work developed and evaluated catalysts that can convert these acids to more upgradeable ketones at the laboratory scale. Selective catalytic conversion of these reactive oxygenates to more easily upgraded compounds can enhance bio-refinery processing economics through catalyst preservation by reduced coking from acid cracking, by preserving carbon efficiency, and through process intensification by coupling particulate removal with partial upgrading. Two metal-doped molybdenum carbide (Mo2C) supported catalyst beads were synthesized and evaluated and their performance compared with an undoped Mo2C control catalyst beads. For laboratory scale acetic acid conversion, calcium doped Mo2C supported catalyst beads produced the highest yield of acetone at ~96% at 450 °C among undoped and Ca or Ni doped catalysts.

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