3031-73-0Relevant academic research and scientific papers
Fourier Transform Infrared Studies of the Self-Reaction of CH3O2 Radicals
Niki, H.,Maker, P. D.,Savage, C. M.,Breitenbach, L. P.
, p. 877 - 881 (1981)
Product studies were made with the FT IR method in the photooxidation of CH3N2CH3 and in the Cl-atom initiated oxidation of CH4 in O2-N2 mixtures at 700 torr and 297 K.The major products were CH2O, CH3OH, and CH3O2H in both systems.A weak, broad absorption band centered at 1030 cm-1 was assigned tentatively to CH3O2CH3.These results are consistent with the following primary and secondary reactions: (primary) 2CH3O2 ---> 2CH3O + O2 (1a); 2CH3O2 ---> CH3OH + CH2O + O2 (1b); 2CH3O2 ---> CH3O2CH3 + O2 (1c); (secondary) CH3O + O2 ---> CH2O + HO2 (5); CH3O2 + HO2 ---> CH3O2H + O2 (6).The relative rate costants for reactions 1a-c were determined to be k1a:k1b:k1c = 0.32 : 0.60 : 0. 08, respectively.
A product yield study of the reaction of HO2 radicals with ethyl peroxy (C2H5O2), acetyl peroxy (CH3C(O)O2), and acetonyl peroxy (CH3C(O)CH2O2) radicals
Hasson, Alam S.,Tyndall, Geoffrey S.,Orlando, John J.
, p. 5979 - 5989 (2004)
Branching ratios for HO2 and RO2 reaction were measured for three organic peroxy radicals: ethyl peroxy, acetyl peroxy, and acetonyl peroxy radicals. In the absence of methanol, yields of acetaldehyde and ethyl hydroperoxide (EHP) were 47 and 35%, respectively. In the presence of equal concentrations of ethane and methanol, the acetaldehyde yield dropped to zero, and the EHP yield rose to 93%. Cl atoms reacted with acetaldehyde in the presence of O2 to form acetyl peroxy radicals. The observed paracetic acid and acetic acid were formed almost exclusively in the reaction of acetyl peroxy radicals with H2O2. In the absence of methanol, Cl atoms reacted with acetone to form acetonyl peroxy radicals, which then predominantly reacted with other peroxy radicals present to form acetonoxy radicals. Simulations showed that chain propagation in RO2+HO2 reactions might have a small impact on tropospheric chemistry under low NOx conditions. The impact of these reactions on OH radical concentrations would be greater for aged air, which typically contains higher concentrations of oxygenated organics and lower levels of NOx.
Catalytic oxidation of methane to methyl hydroperoxide and other oxygenates under mild conditions
Nizova, Galina V.,Suess-Fink, Georg,Shul'pin, Georgiy B.
, p. 397 - 398 (1997)
Methane is oxidized by air in acetonitrile solution to give methyl hydroperoxide (easily reduced to methanol), formaldehyde and formic acid in the presence of [NBu4]VO3-pyrazine-2-carboxylic acid as the catalyst and H2O2 as a promoter.
Selective oxidation of methane to methanol using AuPd@ZIF-8
Sun, Chenghua,Xu, Guowang,Xu, Yongjun,Yu, Aimin
, (2021)
Selective methane conversion to alcohol derivatives remains an open challenge. Here, bimetallic catalyst, AuPd@ZIF-8, has been synthesized and demonstrated as an excellent catalyst in the presence of H2O2 and O2 under mild
Insights into the direct selective oxidation of methane to methanol over ZSM-5 zeolytes in aqueous hydrogen peroxide
Al-Megren, Hamid,Al-Shihri, Saeed,Chadwick, David,Richard, Christian J.
, p. 269 - 278 (2020)
The direct selective oxidation of methane by aqueous hydrogen peroxide over ZSM-5(50) has been investigated. Methyl hydroperoxide was confirmed as the initial product of methane oxidation. The decomposition of methyl hydroperoxide to formaldehyde is established as a key intermediate in an oxidation pathway to formic acid and ultimately CO2. Hydrogen was detected during the oxidation of methane over ZSM-5 zeolites. The hydrogen was evaluated in terms of its origins and possible role in the production of MeOH. The addition of a copper salt to the ZSM-5(50) zeolite was found to decrease the overall productivity of all methane oxygenates. The use of copper also promoted the selectivity for methyl hydroperoxide whilst removing formic acid. The role of hydroxymethyl-methyl hydroperoxide is considered as an intermediate in the decomposition of methyl hydroperoxide to methanol. A tentative proposal into the nature of the iron species responsible for the catalytic species in ZSM-5(50) is made.
Formation of Molecular Hydrogen by Thermal Decomposition of n-Dialkyl Peroxides in Oxygen
Sahetchian, K. A.,Heiss, A.,Rigny, R.
, p. 2382 - 2386 (1987)
The decomposition of low concentrations of di-n-butyl, di-n-heptyl, and di-tert-butyl peroxides in presence of oxygen was investigated in the temperature range 150-200 deg C and under atmospheric pressure.It was shown that H2 and H2O2 were simultaneously formed.The ratio /( + ) was practically independent of oxygen concentration, peroxide concentration, and temperature and its value was about 8percent of that for the n-alkyl peroxides.The results are in favor of the formation of H2 and H2O2 by the homogeneous recombination of HO2 radicals.
FTIR Study of the Kinetics and Mechanism for Cl-Atom-Initiated Reactions of Acetaldehyde
Niki, H.,Maker. P. D.,Savage, C. M.,Breitenbach, L. P.
, p. 588 - 591 (1985)
The rate constant for the reaction Cl + CH3CHO -> CH3CO + HCl was determined to be 7.6 X 10-11 cm3 molecule-1 s-1 at 298 +/- 2 K, using the competitive chlorination method with the reaction Cl + C2H6 as the refe
Cu single-atoms embedded in porous carbon nitride for selective oxidation of methane to oxygenates
Wu, Bo,Yang, Ruoou,Shi, Lei,Lin, Tiejun,Yu, Xing,Huang, Min,Gong, Kun,Sun, Fanfei,Jiang, Zheng,Li, Shenggang,Zhong, Liangshu,Sun, Yuhan
, p. 14677 - 14680 (2020)
Cu single atoms embedded in the C3N4 (Cu-SAs/C3N4) matrix exhibited high activity with 95% oxygenate selectivity for the direct conversion of methane at ambient temperature. The presence of abundant anchoring sites in C3N4 led to highly dispersed Cu-N4 mo
High-Pressure Falloff Curves and Specific Rate Constants for the Reaction CH3 + O2 CH3O2 CH3O + O
Cobos, C. J.,Hippler, H.,Luther, K.,Ravishankara, A. R.,Troe, J.
, p. 4332 - 4338 (1985)
The recombination reaction CH3 + O2 -> CH3O2 was studied at room temperature by laser flash photolysis over the pressure range 0.25-150 bar in the bath gases Ar and N2.Falloff curves are onstructed, leading to a limiting high-pressure rate constant of krec,infinite = (2.2 +/- 0.3) E-12 cm3 molecule-1s-1.By use of a simplified adiabatic channel model, on the basis of the measured krec,infinite a set of specific rate constants k(E,J) is calculated for the unimolecular dissociation CH3O2 -> CH3 + O2 and compared with the reaction CH3O2 -> CH3O + O.With the derived specific rate constants, thermal rate constants for the reaction CH3 + O2 ->/- CH 3O + O are calculated and compared with experiments.
Flash Photolysis Study of the CH3O2 + HO2 Reaction between 248 to 573 K
Lightfoot, P. D.,Veyret, B.,Lesclaux, R.
, p. 708 - 714 (1990)
The kinetics of the reaction CH3O2 + HO2 -> products (1) has been investigated between 248 and 573 K, using the flash photolysis-UV absorption technique.The rate constant, k1, was found to be independent of the presence of up to 12.8 Torr of wa
