Oxidation of Aldehydes With Permanganate in Acidic and Alkaline Media

JÁKY, M.; SZAMMER, J.

doi:10.1002/(sici)1099-1395(199706)10:6<420::aid-poc898>3.3.co;2-p

Cited by 4 publications

(7 citation statements)

References 35 publications

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“…Permanganate can be present as a pure solid (Shaabani et al, 2005) or supported in polymeric materials (Chacko and Mathew, 2003). Jaky and Szammer (1997) showed that the addition of water to the organic solvents increased the reaction rates, indicating that the hydrate form of aldehydes is more reactive than the free form, and that acid catalyzed nucleophilic addition of permanganate is involved. Although not directly applicable to our study, this literature suggests that heterogeneous VOC-permanganate chemistry involves complex mechanisms, in which the presence of moisture likely plays a significant role.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation(UVPCO)/Chemisorbent Air Cleaner for Indoor Air Applications

Hodgson¹,

Destaillats²,

Hotchi³

et al. 2007

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We previously reported that gas-phase byproducts of incomplete oxidation were generated when a prototype ultraviolet photocatalytic oxidation (UVPCO) air cleaner was operated in the laboratory with indoor-relevant mixtures of VOCs at realistic concentrations. Under these conditions, there was net production of formaldehyde and acetaldehyde, two important indoor air toxicants. Here, we further explore the issue of byproduct generation. Using the same UVPCO air cleaner, we conducted experiments to identify common VOCs that lead to the production of formaldehyde and acetaldehyde and to quantify their production rates. We sought to reduce the production of formaldehyde and acetaldehyde to acceptable levels by employing different chemisorbent scrubbers downstream of the UVPCO device. Additionally, we made preliminary measurements to estimate the capacity and expected lifetime of the chemisorbent media. For most experiments, the system was operated at 680 -780 m 3 /h (400 -460 cfm).A set of experiments was conducted with common VOCs introduced into the UVPCO device individually and in mixture. Compound conversion efficiencies and the production of formaldehyde and acetaldehyde were determined by comparison of compound concentrations upstream and downstream of the reactor. There was general agreement between compound conversions efficiencies determined individually and in the mixture. This suggests that competition among compounds for active sites on the photocatalyst surface will not limit the performance of the UVPCO device when the total VOC concentration is low. A possible exception was the very volatile alcohols, for which there were some indications of competitive adsorption. The results also showed that formaldehyde was produced from many commonly 2 encountered VOCs, while acetaldehyde was generated by specific VOCs, particularly ethanol.The implication is that formaldehyde concentrations are likely to increase when an effective UVPCO air cleaner is used in buildings containing typical VOC sources. The magnitude of the expected increase will depend upon a number of interrelated factors.Series of experiments were conducted to determine if the oxidizer, sodium permanganate (NaMnO 4 ·H 2 O), has sufficient reaction rates and capacity to counteract formaldehyde and acetaldehyde production and enable a 50 % reduction in building ventilation rate without net increases in indoor aldehyde concentrations. A commercially produced filter element and two laboratory-fabricated media beds containing NaMnO 4 ·H 2 O chemisorbent media were evaluated. Because the commercial unit contained activated carbon as an additional component, it was effective at removing lower volatility compounds that typically have low oxidation rates in the UVPCO reactor. The filter element also met the minimum efficiency objective for formaldehyde. However, the removal of acetaldehyde was less than required.The air residence time in the single panel bed was not optimized as the removal efficiencies for both formaldehyde and acetaldehyde were s...

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Section: Discussionmentioning

confidence: 99%

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation(UVPCO)/Chemisorbent Air Cleaner for Indoor Air Applications

Hodgson¹,

Destaillats²,

Hotchi³

et al. 2007

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“…However, the absorbance of the reaction mixture decreased with time. This revealed the formation of an intermediate pre-equilibrium complex which led to product formation [4]. Applying steady state approximation:…”

Section: Spectral Studiesmentioning

confidence: 99%

“…Potassium permanganate discovered by Margueritte in 1846 has now been widely used for redox reactions involving a variety of chemical reactions. It is a versatile strong oxidizing agent in both acidic and alkaline media which has been employed for the oxidation of various organic compounds like alcohols [1][2][3], aldehydes and ketones [4][5][6], amines [7], glyoxal and glyoxalic acid [8]. There are few reports in the literature on the oxidation of Diols.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Propane-1,3-diol (Non-Vicinal) by Potassium Permanganate in Aqueous Medium. A Kinetic Study

Latona

2020

Adv. J. Chem. A

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The oxidation of propane-1,3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1,3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1,3-diol] and independent on the ionic strength of the solution. The activation parameters were evaluated from Arrhenius and Erying's equations and the values of〖∆H〗 #(kJ mol-1), 〖∆S〗^#(kJK-1 mol-1) and〖∆G〗^#(kJmol-1) were 24.98,-0.22 and 90.50 respectively. Negative entropy of activation revealed an association mechanism and an ordered transition state for the reaction. Stoichiometric study showed 1:1 consumption of KMnO4 and propane-1,3-diol. Spectroscopic studies and FTIR analysis revealed the product of the reaction to be 3-hydroxyl-propanal. A suitable reaction mechanism was proposed for the reaction investigated.

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“…However, the absorbance of the reaction mixture decreased with time. This revealed the formation of an intermediate preequilibrium complex which led to product formation [4].…”

Section: Spectral Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Propane-1,3-diol Oxidation by Mn(VII) in Aqueous Medium

Latona

2019

Adv. J. Chem. A

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The oxidation of propane-1, 3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1, 3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1, 3-diol] and independent in the ionic strength of the solution. The values of ∆ # (kJ mol -1 ), ∆ # (kJK -1 mol -1 ) ∆ # (kJ mol -1 ) were 24.98, -0.22 and 90.50 respectively. Negative activation of entropy revealed an ordered transition state for the reaction. Spectroscopic studies and FTIR analysis revealed the product of the reaction to be 3-hydroxy-propanone.

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Oxidation of Aldehydes With Permanganate in Acidic and Alkaline Media

Cited by 4 publications

References 35 publications

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation(UVPCO)/Chemisorbent Air Cleaner for Indoor Air Applications

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation(UVPCO)/Chemisorbent Air Cleaner for Indoor Air Applications

Oxidation of Propane-1,3-diol (Non-Vicinal) by Potassium Permanganate in Aqueous Medium. A Kinetic Study

Kinetics and Mechanism of Propane-1,3-diol Oxidation by Mn(VII) in Aqueous Medium

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