ON THE MECHANISM OF OXIDATION OF trans-DECAHYDRONAPHTHALENE AT 100 °C.

1949 ◽  
Vol 27b (2) ◽  
pp. 43-60
Author(s):  
D. S. McArthur ◽  
E. A. Smith
Keyword(s):  
Carbon Monoxide ◽  
Volatile Compounds ◽  
Oxygen Concentration ◽  
Trans Isomer ◽  
Oxidation Reaction ◽  
Activation Energies ◽  
Oxidation Products ◽  
Gaseous Oxygen ◽  
Volatile Oxidation Products ◽  
Mechanism Of Oxidation

The mechanism of oxidation of the trans-isomer of decahydronaphthalene (trans-decalin) by gaseous oxygen at 100 °C. has been studied. The rate of retention of oxygen by decalin and the rates of formation of three volatile oxidation products were measured over the first 100 to 200 hr. of the oxidation reaction. The rate of retention of oxygen has been found to be independent of the oxygen concentration in the oxidizing gases but to depend on decalin concentration to the three-halves power. The rates of formation of the volatile oxidation products are also independent of oxygen concentration but are proportional to the decalin concentration. The activation energies of each of the reactions were determined. An initiating reaction forming carbon monoxide and hydrogen has been postulated based on the ratio of the rates of formation of the volatile compounds in the inhibited period of oxidation. Some data on the mechanism of the oxidation reaction in the accelerated period have also been obtained.

scholarly journals Quantification of Contaminant Removal by Evactron Cleaning Using Quartz Crystal Thickness Monitors

2007 ◽  
Vol 15 (5) ◽  
pp. 22-25
Author(s):  
Christopher G. Morgan ◽  
Mark M. Gleason ◽  
Ronald Vane
Keyword(s):  
Volatile Compounds ◽  
Oxygen Radicals ◽  
Quartz Crystal ◽  
Oxygen Radical ◽  
Oxidation Products ◽  
Crystal Thickness ◽  
Contaminant Removal ◽  
Persistent Problem ◽  
Volatile Oxidation Products ◽  
Electron Microscopes

Hydrocarbon (HC) contamination is a persistent problem for users of electron microscopes (EMs), often leading to image distortion and interference with nanoprobing. The Evactron De-Contaminator (D-C) has been available for HC contamination removal in EMs since 1999. The Evactron D-C uses low power radio frequency (RF) generated plasma in order to produce oxygen radicals that clean the EM. The Oxygen Radical Source (ORS) is attached to the EM chamber, and a controlled leak of oxygen containing gas such as room air is passed through the plasma in order to produce oxygen radicals. The oxygen radicals chemically react with the HCs to form volatile oxidation products such as H2O, CO and CO2. These volatile compounds are pumped out of the EM chamber.

Characterization of Non-volatile Oxidation Products Formed from Triolein in a Model Study at Frying Temperature

2021 ◽  
Vol 69 (11) ◽  
pp. 3466-3478
Author(s):  
Sílvia Petronilho ◽  
Bruna Neves ◽  
Tânia Melo ◽  
Sara Oliveira ◽  
Eliana Alves ◽  
...  
Keyword(s):  
Oxidation Products ◽  
Frying Temperature ◽  
Model Study ◽  
Volatile Oxidation Products

scholarly journals Secondary Organic Aerosol Formation Enhanced by Organic Seeds of Similar Polarity at Atmospherically Relative Humidity

2015 ◽  
Vol 1 (2) ◽  
pp. 6-10 ◽  
Author(s):  
Catherine A. Gordon ◽  
Jianhuai Ye ◽  
Arthur W.H. Chan
Keyword(s):  
Climate Models ◽  
Secondary Organic Aerosol ◽  
Phase Particle ◽  
Organic Aerosol ◽  
Atmospheric Particulate Matter ◽  
Oxidation Products ◽  
Tetraethylene Glycol ◽  
Aerosol Formation ◽  
Volatile Oxidation Products ◽  
Low Humidity

Secondary Organic Aerosol (SOA) forms in the atmosphere when semi-volatile oxidation products from biogenic and anthropogenic hydrocarbons condense onto atmospheric particulate matter. Climate models assume that oxidation products and preexisting organic aerosol form a well-mixed particle and enhance condensation, and, as a result, predict that future increases in anthropogenic primary organic aerosol (POA) will cause a significant increase in SOA. However, recent experiments performed at low humidity (<10%) demonstrate a single-phase particle does not always form, challenging the validity of model assumptions. In this work, we investigate the formation of SOA at atmospherically relevant humidities (55 - 65%) and examine this mixing assumption. We hypothesized that humidity leads to decreased viscosity and shorter mixing timescales, which is favorable for aerosol mixing. Here, α-pinene, a biogenic volatile organic compound is oxidized with ozone in a flow tube reactor in the presence of different organic aerosol seeds. Increased humidity did not enhance SOA formation with erythritol or squalane seed as hypothesized, implying that these compounds do not mix with α-pinene SOA in the range of humidities studied (55 – 65%). Yield enhancements were observed with tetraethylene glycol seed, demonstrating interaction between the SOA and seed. These observations suggest increased humidity does not promote mixing between the oxidation products and POA and highlight the need to fully understand the aerosol phase state in the atmosphere in order to better parameterize SOA formation and accurately predict future changes in air quality.

The Rate of Racemization and Isomerization of the cis-Chloroaquobis(ethylenediamine) cobalt(III) Ion

1963 ◽  
Vol 16 (3) ◽  
pp. 352 ◽  
Author(s):  
AM Sargeson
Keyword(s):  
Trans Isomer ◽  
Activation Energies ◽  
Kcal Mole

The rate of isomerization of the cis-chloroaquobis(ethylenediamine)cobalt(III) ion to the trans-isomer k30� = 2.7 x 10-3 min-1 has been shown to be the same as the rate of racemization k30� = 2.61 x 10-3 min-1. The activation energies and entropies for the reactions are AEa = 27 � 1 kcal/mole, AS? = $2 e.u., and ΔEa = 26.7 � 0.2 kcal/mole, AS? = +2.3 e.u. respectively.

Tribocatalytic Enhancement of Methane Oxidation

2005 ◽  
Author(s):  
Tomotaka Abe ◽  
Ken’ichi Hiratsuka ◽  
Czesław Kajdas
Keyword(s):  
Organic Chemistry ◽  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Electron Emission ◽  
Oxidation Reaction ◽  
Negative Ion ◽  
Silver Catalyst ◽  
Oxidation Reactions ◽  
Action Mechanism

Oxidation reaction of methane is one of the most fundamental reactions in organic chemistry. This reaction is enhanced by silver catalyst [1]. In this study, we confirmed that the catalytic activity of silver is enhanced more by the friction. This effect is called tribocatalysis. In previous studies about tribocatalysis, we have shown that the oxidation reactions of hydrogen [2], carbon monoxide [3] and ethylene were promoted by the friction. According to NIRAM (negative-ion-radical action mechanism) approach, exo-electron emission triggers the promotion of chemical reactions [4]. Insulator such as aluminum oxide, when it is worn, emits larger number of negative particles including electrons compared with metals [5]. Therefore we expected that the friction of aluminum oxide promotes tribochemical reactions more than metals.

scholarly journals Effect of Omega-3 Microcapsules Addition on the Profile of Volatile Compounds in Enriched Dry-Cured and Cooked Sausages

Foods ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1683
Author(s):  
Juan Carlos Solomando ◽  
Teresa Antequera ◽  
Alberto Martín ◽  
Trinidad Perez-Palacios
Keyword(s):  
Lipid Oxidation ◽  
Volatile Compounds ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Oxidation Stability ◽  
Meat Products ◽  
Oxidation Products ◽  
Gas Chromatography Mass Spectrometry ◽  
Omega 3 ◽  
Meat Samples

The main goal of the present study was evaluating the effect of enriching meat products (cooked (C-SAU) and dry-cured sausages (D-SAU)) with monolayered (Mo) and multilayered (Mu) fish oil microcapsules on the profile of volatile compounds, with special interest in lipid oxidation markers. For that, Solid-Phase Microextraction (SPME) and Gas Chromatography-Mass Spectrometry (GC-MS) were used. Significant differences were found in the volatile compound profile between Mo and Mu, which was been reflected in the meat samples. Thus, in general, volatile compounds from lipid oxidation have shown higher abundance in Mo and C-SAU and D-SAU enriched with this type of microcapsule, indicating that the wall of Mu (chitosan-maltodextrine) might protect the encapsulated bioactive compounds more effectively than that of Mo (maltodextrine). However, this finding is not reflected in the results of previous studies evaluating the sensory perception and oxidation stability of C-SAU and D-SAU, but it should be considered since unhealthy oxidation products can be formed in the enriched meat products with Mo. Thus, the addition of Mu as an omega-3 vehicle for enriching meat products may be indicated.

scholarly journals A New Method for Determining Phosphorus in Organic Phosphorus Compounds

1891 ◽  
Vol 17 ◽  
pp. 382-384
Author(s):  
E. A. Letts ◽  
R. F. Blake
Keyword(s):  
Phosphoric Acid ◽  
Organic Phosphorus ◽  
Combustion Process ◽  
Oxidation Products ◽  
New Method ◽  
Phosphorus Compounds ◽  
Great Stability ◽  
Considerable Uncertainty ◽  
Volatile Oxidation Products

In the phosphines and their derivatives, which we have investigated from, time to time, considerable uncertainty has always attended the determinations of phosphorus by the ordinary methods recommended for the purpose. In fact, we never felt any confidence in the result, for no matter how carefully the determinations were made, duplicate analyses led to different numbers.The uncertainty depends partly upon the difficulty of oxidising the phosphorus in such compounds to phosphoric acid. For, as a rule, in any dry combustion process which may be employed, volatile oxidation products, containing phosphorus, are formed of great stability, which frequently pass over the red-hot oxidising mixture almost unchanged. Moreover, the glass of the tube is attacked by the oxidising mixture, and this undoubtedly leads to inaccuracies, probably of considerable magnitude.

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