Catalytic ozonation of refractory organic model compounds in aqueous solution by aluminum oxide

2004 ◽  
Vol 47 (1) ◽  
pp. 15-25 ◽  
Author(s):  
Mathias Ernst ◽  
Franck Lurot ◽  
Jean-Christophe Schrotter
Keyword(s):  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Catalytic Ozonation ◽  
Model Compounds

The reaction mechanism of catalytic oxidation with hydrogen peroxide and ozone in aqueous solution

2003 ◽  
Vol 47 (1) ◽  
pp. 179-184 ◽  
Author(s):  
J.S. Park ◽  
H. Choi ◽  
K.H. Ahn
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Catalytic Ozonation ◽  
Sorption Behavior ◽  
Model Compounds ◽  
Reaction Characteristics ◽  
Hydrophobic Portion ◽  
Bicarbonate Addition

The sorption and catalytic oxidation of model compounds (pCBA and phenanthrene) and NOM on FeOOH were investigated using hydrogen peroxide and ozone, respectively. After oxidation with ozone, the hydrophobic, transphilic, and hydrophilic NOM fractions were isolated using XAD-8 and -4 resins to analyze the reaction characteristics. The sorption of pCBA was strongly dependent upon the pH, but phenanthrene exhibited a sorption behavior that was independent of the pH. In the case of NOM, the hydrophobic portion showed higher sorption affinity than hydrophilic and transphilic at pH 7.2. The concentrations of model compounds and oxidants were measured during the oxidations and the efficiency was compared for tests done with ozone alone and those using catalytic ozonation. Through the comparison of the sorption and decomposition of the model compounds, along with the effects of bicarbonate addition, mechanisms for catalytic oxidation with hydrogen peroxide or ozone were proposed, respectively.

Lanthanum Aluminum Oxide Thin-Film Dielectrics from Aqueous Solution

2015 ◽  
Vol 7 (3) ◽  
pp. 1678-1684 ◽  
Author(s):  
Paul N. Plassmeyer ◽  
Kevin Archila ◽  
John F. Wager ◽  
Catherine J. Page
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Oxide Thin Film ◽  
Lanthanum Aluminum Oxide ◽  
Thin Film Dielectrics

scholarly journals Tunable high-κ ZrxAl1−xOy thin film dielectrics from all-inorganic aqueous precursor solutions

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 39147-39152 ◽  
Author(s):  
K. N. Woods ◽  
E. C. Waddington ◽  
C. A. Crump ◽  
E. A. Bryan ◽  
T. S. Gleckler ◽  
...  
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Dielectric Properties ◽  
Aluminum Oxide ◽  
Oxide Thin Film ◽  
Solution Route ◽  
Thin Film Dielectrics ◽  
Film Dielectric ◽  
Inorganic Aqueous Solution

An all-inorganic, aqueous solution route enables facile control of composition and optimization of zirconium aluminum oxide thin film dielectric properties.

Slip velocity and temperature jump of a non-Newtonian nanofluid, aqueous solution of carboxy-methyl cellulose/aluminum oxide nanoparticles, through a microtube

2019 ◽  
Vol 29 (5) ◽  
pp. 1606-1628 ◽  
Author(s):  
Marjan Goodarzi ◽  
Saeed Javid ◽  
Ali Sajadifar ◽  
Mehdi Nojoomizadeh ◽  
Seyed Hossein Motaharipour ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Temperature Jump ◽  
Methyl Cellulose ◽  
Oxide Nanoparticles ◽  
Carboxy Methyl Cellulose ◽  
Aluminum Oxide Nanoparticles ◽  
Content Type ◽  
Carboxy Methyl

Purpose With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of using aluminum oxide nanoparticles in non-Newtonian fluid of aqueous solution of carboxy-methyl cellulose in microtube and through application of different slip coefficients to achieve various qualities on surface of microtube. Design/methodology/approach Simultaneously, the effect of presence of nanoparticles and phenomenon of slip and temperature jump has been explored in non-Newtonian nanofluid in this essay. The assumption of homogeneity of nanofluid and fixed temperature of wall in microtube has been used in modeling processes. Findings The results have been presented as diagrams of velocity, temperature and Nusselt Number and the investigations have indicated that addition of nanoparticles to the base fluid and increase in microtube slip coefficient might improve rate of heat transfer in microtube. Originality/value The flow of non-Newtonian nanofluid of aqueous solution of carboxy methyl cellulose-aluminum oxide has been determined in a microtube for the first time.

The Chemical Evolution of a Nitrogenase Model, 20 Alkyl Molybdates(VI) and the Mechanism of Hydrocarbon Production by Nitrogenase [1]

1982 ◽  
Vol 37 (3) ◽  
pp. 380-385 ◽  
Author(s):  
G. N. Schrauzer ◽  
Laura A. Hughes ◽  
Norman Strampach
Keyword(s):  
Aqueous Solution ◽  
Alkaline Hydrolysis ◽  
Room Temperature ◽  
Bond Cleavage ◽  
Model Compounds ◽  
Hydrocarbon Production ◽  
Acidic Solutions ◽  
Reducing Conditions ◽  
Hydrolysis Of ◽  
Derivatives Of

Abstract Colorless alkylmolybdates(VI) of composition R-MoO3-are generated in aqueous solutions by the alkaline hydrolysis of complexes R-Mo(Bpy)(0)2Br(Bpy = 2,2′-bipyridyl, R = CH3 and higher alkyl). At room temperature in alkaline aqueous solution, the new organometallic derivatives of oxomolybdate(VI) are remarkably resistant against Mo-C bond hydrolysis. Decomposition occurs more rapidly on heating, affording unrearranged alkanes according to the eq.: R-MoO3- + OH-→RH + Mo04=. In acidic solutions, the methylmolybdate(VI) species decomposes with the formation of a mixture of methane and ethane while higher alkylmolybdates carrying hydrogen in the β-position relative to molybdenum undergo Mo-C bond heterolysis by way of β-elimina-tion: R-CH2CH2-MoO3 → Mo+4 (aq) + H+ + R-CH = CH2. The Mo-C bond of alkylmolybdates is resistant to oxidants but is very sensitive to cleavage under reducing conditions. Reductive Mo-C bond cleavage occurs particularly rapidly in the presence of thiols and reduced ferredoxin model compounds. The latter reactions simulate the terminal steps of hydrocarbon producing reactions of nitrogenase with alternate substrates such as CN-, R-CN or R-NC, confirming previous mechanistic conclusions concerning the mechanism of nitrogenase action.

Catalytic ozonation by Si-doped α-Fe2O3 for the removal of nitrobenzene in aqueous solution

2019 ◽  
Vol 228 ◽  
pp. 115766 ◽  
Author(s):  
Pengwei Yan ◽  
Jimin Shen ◽  
Lei Yuan ◽  
Jing Kang ◽  
Binyuan Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Ozonation ◽  
Si Doped
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