Green and mild oxidation: from acetate anion to oxalate anion

2018 ◽  
Vol 71 (23) ◽  
pp. 3947-3954 ◽  
Author(s):  
Lu-Yi Zheng ◽  
Yan-Hui Chi ◽  
Yuan Liang ◽  
Ethan Cottrill ◽  
Ning Pan ◽  
...  
Keyword(s):  
Acetate Anion ◽  
Mild Oxidation ◽  
Oxalate Anion

scholarly journals Crystal-to-Crystal Transformation from K2[Co(C2O4)2(H2O)2]·4H2O to K2[Co(μ-C2O4)(C2O4)]

2021 ◽  
Vol 7 (6) ◽  
pp. 77
Author(s):  
Bin Zhang ◽  
Yan Zhang ◽  
Guangcai Chang ◽  
Zheming Wang ◽  
Daoben Zhu
Keyword(s):  
Hydrogen Bond ◽  
Physical Properties ◽  
Crystal Structures ◽  
Molecular Crystal ◽  
Trigonal Prism ◽  
Space Group ◽  
Cell Parameters ◽  
Oxalate Anion ◽  
Crystal Transformation ◽  
Antiferromagnetic Ordering

Crystal-to-crystal transformation is a path to obtain crystals with different crystal structures and physical properties. K2[Co(C2O4)2(H2O)2]·4H2O (1) is obtained from K2C2O4·2H2O, CoCl2·6H2O in H2O with a yield of 60%. It is crystallized in the triclinic with space group P1 and cell parameters: a = 7.684(1) Å, b = 9.011(1) Å, c = 10.874(1) Å, α = 72.151(2)°, β = 70.278(2)°, γ = 80.430(2)°, V = 670.0(1) Å3, Z = 2 at 100 K. 1 is composed of K+, mononuclear anion [Co(C2O4)2(H2O)22−] and H2O. Co2+ is coordinated by two bidentated oxalate anion and two H2O in an octahedron environment. There is a hydrogen bond between mononuclear anion [Co(C2O4)2(H2O)22−] and H2O. K2[Co(μ-C2O4)(C2O4)] (2) is obtained from 1 by dehydration. The cell parameters of 2 are a = 8.460(5) Å, b = 6.906 (4) Å, c = 14.657(8) Å, β = 93.11(1)°, V = 855.0(8) Å3 at 100 K, with space group in P2/c. It is composed of K+ and zigzag [Co(μ-C2O4)(C2O42−]n chain. Co2+ is coordinated by two bisbendentate oxalate and one bidentated oxalate anion in trigonal-prism. 1 is an antiferromagnetic molecular crystal. The antiferromagnetic ordering at 8.2 K is observed in 2.

Mono-N-oxidation of heterocycle-fused pyrimidines

2021 ◽  
Vol 50 (6) ◽  
pp. 2143-2148
Author(s):  
Yongxing Tang ◽  
Kejia Li ◽  
Ajay Kumar Chinnam ◽  
Richard J. Staples ◽  
Jean'ne M. Shreeve
Keyword(s):  
Mild Oxidation ◽  
Oxidation Reactions ◽  
Energetic Compounds ◽  
Thermal Stabilities

Mild oxidation reactions of nitrogen-rich heterocyclic rings lead to the formation of energetic compounds with the mono-N-oxide moiety which show good thermal stabilities and detonation performances.

Solvent-free mechanochemical mild oxidation method to enhance adsorption properties of chitosan

2021 ◽  
Vol 15 (6) ◽  
Author(s):  
Mohammadtaghi Vakili ◽  
Wen Qiu ◽  
Giovanni Cagnetta ◽  
Jun Huang ◽  
Gang Yu
Keyword(s):  
Adsorption Properties ◽  
Solvent Free ◽  
Mild Oxidation ◽  
Oxidation Method

scholarly journals Hydrogenation of Furfural to Furfuryl Alcohol over Ru Particles Supported on Mildly Oxidized Biochar

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 934 ◽  
Author(s):  
Raoof Bardestani ◽  
Rouholamin Biriaei ◽  
Serge Kaliaguine
Keyword(s):  
Surface Density ◽  
Furfuryl Alcohol ◽  
Surface Segregation ◽  
Catalyst Support ◽  
Mild Oxidation ◽  
Tem Analysis ◽  
Original Contribution ◽  
Icp Analysis ◽  
Optimized Conditions ◽  
Autoclave Reactor

Catalytic hydrogenation of aldehydes is required as the stabilizing step in bio-oils conversion. Ruthenium supported on carbon was used in the present work for hydrogenation of furfural (FF) to furfuryl alcohol (FA). Converting a biochar with no surface area and low carboxyl groups surface density to an outstanding catalyst support using a very simple mild air/steam oxidation is the original contribution of this work. The mildly oxidized biochar is impregnated with a targeted loading of 2.5 wt.% Ru via ion-exchange, using Ru(NH3)6Cl2 precursor. ICP analysis shows that the mild oxidation increases Ru adsorption capacity of untreated biochar from 1.2 to 2.2 wt.%. H2 chemisorption and TEM analysis indicate that the preliminary mild oxidation leads to higher Ru dispersion. XPS analysis also shows that the treatment prevents Ru from surface segregation. The highest value of 93% FA selectivity at 53% FF conversion was obtained in a batch autoclave reactor under optimized conditions.

EFFECT OF PERACETIC ACID OXIDATION ON N-CONTAINING COMPONENTS OF HUMIC MATERIALS

1980 ◽  
Vol 60 (3) ◽  
pp. 541-548 ◽  
Author(s):  
M. SCHNITZER ◽  
D. A. HINDLE
Keyword(s):  
Amino Acid ◽  
Peracetic Acid ◽  
Amino Sugar ◽  
Chemical Oxidation ◽  
Acid Oxidation ◽  
Mild Oxidation ◽  
Total N ◽  
Different Types ◽  
Humic Materials ◽  
Insight Into

Three humic and one fulvic acid were degraded by mild chemical oxidation with peracetic acid, with special emphasis on the effects of this type of oxidation on N-containing components. The different types of N that were considered were NH4+-N, amino acid-N, amino sugar-N, NO2−-N + NO3−-N, and by difference from total N, "unknown" N. The behaviour toward mild chemical oxidation of all four preparations was essentially similar: there were decreases in mino acid-N, amino sugar-N and "unknown" N, increases in NH4+-N, NO2−-N + NO3−-N with one material, and in N-gases. The "unknown" N was not inert. Between 16.6 and 59.1% of the latter appeared to be converted, as a result of mild chemical oxidation, to NH3 and N-gases which were expelled from the systems. The results presented provide an insight into what happens to N-containing humic components as a result of mild oxidation.

Mild oxidation of starches with aqueous bromine

1973 ◽  
Vol 27 (2) ◽  
pp. 341-357 ◽  
Author(s):  
I. Ziderman ◽  
J. Bel-Ayche
Keyword(s):  
Mild Oxidation

MeAPO4 Berlinite as an Effective Catalyst for Mild Oxidation of Cyclohexane

2013 ◽  
Vol 709 ◽  
pp. 102-105 ◽  
Author(s):  
Da Lei Sun ◽  
Zi Sheng Chao
Keyword(s):  
Molecular Oxygen ◽  
Atmospheric Pressure ◽  
Molecular Sieve ◽  
Catalytic Performance ◽  
Synergic Effect ◽  
Mild Oxidation ◽  
Effective Catalyst ◽  
Ft Ir

Cobalt and/or manganese incorporated berlinites (CoMnAPO4) and aluminophosphate molecule sieve (CoMnAPO-5) were hydrothermally synthesized, characterized by XRD, FT-IR, XPS and SEM, and employed as catalysts in the oxidation of cyclohexane with molecular oxygen at 348 K under atmospheric pressure. It was found that the berlinite-based catalysts were more selective for the production of KA oil, stable during the reaction, but slightly less active for the conversion of cyclohexane, when compared to their molecular sieve counterparts. The CoMnAPO4exhibited a better catalytic performance, due to a synergic effect, than the CoAPO4or MnAPO4.

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