Catalytic oxidation of cellulose to formic acid in H5PV2Mo10O40 + H2SO4 aqueous solution with molecular oxygen

2016 ◽  
Vol 18 (17) ◽  
pp. 4725-4732 ◽  
Author(s):  
Ting Lu ◽  
Muge Niu ◽  
Yucui Hou ◽  
Weize Wu ◽  
Shuhang Ren ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Catalytic Oxidation ◽  
Molecular Oxygen ◽  
Heteropoly Acid ◽  
Ph Modifier ◽  
H2so4 Aqueous Solution

In this work, the most frequently-used heteropoly acid H5PV2Mo10O40 was employed with a pH “modifier” of H2SO4 in aqueous solution for the catalytic oxidation of cellulose to formic acid.

Conversion of wheat straw into formic acid in NaVO3–H2SO4 aqueous solution with molecular oxygen

2015 ◽  
Vol 17 (1) ◽  
pp. 453-459 ◽  
Author(s):  
Muge Niu ◽  
Yucui Hou ◽  
Shuhang Ren ◽  
Weize Wu ◽  
Kenneth N. Marsh
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Wheat Straw ◽  
Molecular Oxygen ◽  
High Efficiency ◽  
Mild Conditions ◽  
H2so4 Aqueous Solution

Wheat straw could be directly converted into formic acid in NaVO3–H2SO4 aqueous solution with molecular O2 as an oxidant under mild conditions with a high efficiency.

Reaction of Dihydroxymethyl Radical with Molecular Oxygen in Aqueous Solution

1980 ◽  
Vol 35 (8) ◽  
pp. 1035-1039 ◽  
Author(s):  
Eberhard Bothe ◽  
Dietrich Schulte-Frohlinde
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Formic Acid ◽  
Molecular Oxygen ◽  
Rate Constants ◽  
Oxygen Diffusion ◽  
Bimolecular Reaction ◽  
Dose Rates ◽  
A Value ◽  
Diffusion Controlled

Abstract Dihydroxymethyl radical (1) was found to react with oxygen diffusion controlled (k = 4.5 x 109 M-1 s-1). The final products of the reaction are formic acid and 1/2 hydrogen peroxide. The precursor of H2O2 was shown to be O2·- which is formed with G(O2·-) = 6.3 (a value which includes the O2·- formed by H atoms and oxygen (G(H) = 0.55)). If it is assumed that dihydroxymethylperoxyl radicals are formed as intermediates the rate constant of O2·- formation must be ≥ 106 s-1 . A bimolecular reaction of two dihydroxy-methylperoxyl radicals forming tetroxides does not occur at the dose rates used. The rate constants for the establishment of the equilibriumhave been determined at pH 5.7 and 19 °C to be k3=1.9x 10-2 M-1 s-1 and k-3 = 1.5 X 10-6 M-1 s-1 in aqueous solution.

Catalytic oxidation of cellulose to formic acid in V(V)-Fe(III)-H 2 SO 4 aqueous solution with O 2

2018 ◽  
Vol 173 ◽  
pp. 197-204 ◽  
Author(s):  
Ting Lu ◽  
Yucui Hou ◽  
Weize Wu ◽  
Muge Niu ◽  
Wei Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Catalytic Oxidation

Cationic poly-L-amino acid-enhanced selective hydrogen production based on formate decomposition with platinum nanoparticles dispersed by polyvinylpyrrolidone

2021 ◽  
Author(s):  
Yusuke Minami ◽  
Yutaka Amao
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Hydrogen Production ◽  
Formic Acid ◽  
Platinum Nanoparticles ◽  
Hydrogen Carrier ◽  
Low Toxicity ◽  
Formate Decomposition

Formate is attracting attention as a hydrogen carrier because of its low toxicity and easy handling in aqueous solution. In order to utilize formic acid as a hydrogen carrier, a...

scholarly journals Crystallization and preliminary X-ray characterization of the 2,4′-dihydroxyacetophenone dioxygenase fromAlcaligenessp. 4HAP

2014 ◽  
Vol 70 (6) ◽  
pp. 823-826 ◽  
Author(s):  
G. Beaven ◽  
A. Bowyer ◽  
P. Erskine ◽  
S. P. Wood ◽  
A. McCoy ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Formic Acid ◽  
Molecular Oxygen ◽  
Aromatic Ring ◽  
Bond Cleavage ◽  
Its Sequence ◽  
Hydroxybenzoic Acid ◽  
X Ray

The enzyme 2,4′-dihydroxyacetophenone dioxygenase (or DAD) catalyses the conversion of 2,4′-dihydroxyacetophenone to 4-hydroxybenzoic acid and formic acid with the incorporation of molecular oxygen. Whilst the vast majority of dioxygenases cleave within the aromatic ring of the substrate, DAD is very unusual in that it is involved in C—C bond cleavage in a substituent of the aromatic ring. There is evidence that the enzyme is a homotetramer of 20.3 kDa subunits each containing nonhaem iron and its sequence suggests that it belongs to the cupin family of dioxygenases. By the use of limited chymotrypsinolysis, the DAD enzyme fromAlcaligenessp. 4HAP has been crystallized in a form that diffracts synchrotron radiation to a resolution of 2.2 Å.

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