Ab initio kinetics on low temperature oxidation of iso-pentane: The first oxygen addition

2018 ◽  
Vol 190 ◽  
pp. 119-132 ◽  
Author(s):  
Lili Ye ◽  
Lidong Zhang ◽  
Fei Qi
Keyword(s):  
Low Temperature ◽  
Ab Initio ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxygen Addition

scholarly journals Catalytic Effect of Cobalt Additive on the Low Temperature Oxidation Characteristics of Changqing Tight Oil and Its SARA Fractions

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2848 ◽  
Author(s):  
Tengfei Wang ◽  
Jiexiang Wang
Keyword(s):  
Low Temperature ◽  
Oil Recovery ◽  
Catalytic Effect ◽  
Addition Reaction ◽  
Tight Oil ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Bond Scission ◽  
Sara Fractions ◽  
Oxygen Addition

Air flooding is a potential enhanced oil recovery (EOR) method to economically and efficiently develop a tight oil reservoir due to its sufficient gas source and low operational costs, during which low temperature oxidation (LTO) is the key to ensuring the success of air flooding. In addition to inefficiency of conventional LTO, air flooding has seen its limited applications due to the prolonged reaction time and safety constraints. In this paper, a novel air injection technique based on the catalyst-activated low temperature oxidation (CLTO) is developed to improve the operational safety together with its oil recovery in tight oil reservoirs. Experimentally, static oxidation experiments are conducted to examine the influence of the catalyst on the LTO reaction kinetics of Changqing tight oil and its fractions. The catalytic oxidation characteristics are identified by applying a thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR) with respect to tight oil and its SARA (i.e., saturates, aromatics, resins, and asphaltenes) fractions. Accordingly, the catalyst can obviously decrease the LTO reaction activation energy of the Changqing tight oil and its SARA fraction. Cobalt additive can change the LTO reaction pathways of the SARA fractions, i.e., promoting the formation of hydroxyl-containing oxides and CO2 from the oxidation of saturates, aromatics and resins, while inhibiting the formation of ethers from the oxidation of aromatics and resins. The LTO of each SARA fraction contains both oxygen addition reaction and bond scission reaction that can be effectively promoted with the cobalt additive. The catalytic effect on the bond scission reaction is continuously enhanced and becomes gradually stronger than that on the oxygen addition reaction as the reaction proceeds.

scholarly journals Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 641
Author(s):  
Lukasz Wolski ◽  
Grzegorz Nowaczyk ◽  
Stefan Jurga ◽  
Maria Ziolek
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Benzyl Alcohol ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Key Factor ◽  
Au Particle Size ◽  
Co Precipitation

The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

Low temperature oxidation of copper alloys—AEM and AFM characterization

2007 ◽  
Vol 42 (12) ◽  
pp. 4684-4691 ◽  
Author(s):  
Mari Honkanen ◽  
Minnamari Vippola ◽  
Toivo Lepistö
Keyword(s):  
Low Temperature ◽  
Copper Alloys ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation

scholarly journals A study of the low-temperature oxidation of a long chain aldehyde: n-hexanal

2017 ◽  
Vol 36 (1) ◽  
pp. 365-372 ◽  
Author(s):  
Anne Rodriguez ◽  
Olivier Herbinet ◽  
Frédérique Battin-Leclerc
Keyword(s):  
Low Temperature ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Long Chain ◽  
Chain Aldehyde
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