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.

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.

CO2as a hydrogen vector – transition metal diamine catalysts for selective HCOOH dehydrogenation

2017 ◽  
Vol 46 (5) ◽  
pp. 1670-1676 ◽  
Author(s):  
Cornel Fink ◽  
Gábor Laurenczy
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Formic Acid ◽  
Catalytic Dehydrogenation ◽  
Mild Conditions ◽  
Adjustable Rate

The homogeneous catalytic dehydrogenation of formic acid in aqueous solution provides an efficientin situmethod for hydrogen production, under mild conditions, and at an adjustable rate.

Promoted oxidation of phenol in aqueous solution using molecular oxygen at mild conditions

1999 ◽  
Vol 18 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Frédéaric Vogel ◽  
Julien Harf ◽  
Andreas Hug ◽  
Philipp Rudolf Von Rohr
Keyword(s):  
Aqueous Solution ◽  
Molecular Oxygen ◽  
Mild Conditions ◽  
Oxidation Of Phenol

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.

Phosphomolybdate assembly as a low-cost catalyst for the reduction of toxic Cr(vi) in aqueous solution

2017 ◽  
Vol 46 (24) ◽  
pp. 7917-7925 ◽  
Author(s):  
Xiaoxiao Wang ◽  
Jiaojiao Wang ◽  
Zongke Geng ◽  
Zhao Qian ◽  
Zhangang Han
Keyword(s):  
Activation Energy ◽  
Aqueous Solution ◽  
Formic Acid ◽  
Low Cost ◽  
Hybrid Compound ◽  
Molecular Catalyst ◽  
Mild Conditions

A fully reduced phosphomolybdate hybrid compound was active as a heterogeneous molecular catalyst to reduce toxic Cr(vi) to nontoxic Cr(iii) using formic acid under mild conditions. The activation energy was calculated to be 78.5 kJ·mol−1.

ADSORPTION OF LEAD AND COPPER FROM AQUEOUS SOLUTION USING UNMODIFIED WHEAT STRAW

2013 ◽  
Vol 12 (11) ◽  
pp. 2117-2124 ◽  
Author(s):  
Mehwish Anis ◽  
Sajjad Haydar ◽  
Abdul Jabbar Bari
Keyword(s):  
Aqueous Solution ◽  
Wheat Straw

REMOVAL OF HEAVY METAL Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II) IONS FROM AQUEOUS SOLUTION BY MENTHA PIPERITA EXTRACT

2020 ◽  
pp. 15-20
Author(s):  
Ersin Yucel ◽  
Mine Yucel
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
High Efficiency ◽  
Correlation Coefficients ◽  
Langmuir Model ◽  
Mentha Piperita ◽  
Freundlich Model ◽  
Biosorption Capacity ◽  
Peppermint Extract ◽  
The Stability

In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.

Application of Poly(Vinylbenzyltrimethylammonium Tribromide) Resin as an Efficient Polymeric Catalyst in the Acetalization and Diacetylation of Benzaldehydes

2020 ◽  
Vol 17 ◽  
Author(s):  
Zubiao Zheng ◽  
Bingbing Han ◽  
Junjun Hu ◽  
Xianwei Li
Keyword(s):  
High Efficiency ◽  
Optimal Conditions ◽  
Mild Conditions ◽  
Polymeric Catalyst

: The applications of a new supported tribromide reagent (poly(vinylbenzyltrimethylammonium tribromide) resin) were reported. This supported tribromide resin was used as a catalyst in the acetalization and diacetylation of benzaldehydes under mild conditions with high efficiency. The effects of solvents, amount of the supported tribromide resin on the reactions were investigated. Under the optimal conditions, most of acetal and 1,1-diacetates of benzaldehydes were selectively obtained in excellent yields.

scholarly journals Practical Synthesis of 2-Iodosobenzoic Acid (IBA) without Contamination by Hazardous 2-Iodoxybenzoic Acid (IBX) under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1897
Author(s):  
Hideyasu China ◽  
Nami Kageyama ◽  
Hotaka Yatabe ◽  
Naoko Takenaga ◽  
Toshifumi Dohi
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Practical Method ◽  
Hypervalent Iodine ◽  
Mild Conditions ◽  
Sequential Procedures ◽  
Iodine Compounds ◽  
Practical Synthesis ◽  
Iodosobenzoic Acid ◽  
Lower Temperature

We report a convenient and practical method for the preparation of nonexplosive cyclic hypervalent iodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy group under mild conditions of 80 °C or lower temperature. These sequential procedures are highly reliable to selectively afford cyclic hypervalent iodine compounds in excellent yields without contamination by hazardous pentavalent iodine(III) compound.

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