Iron modified vanadyl phosphate as oxidation catalyst

Some additional data about properties and applicability of a styrene-divinylbenzene polymer catalyst containing acidic and redox functional groups are reported. It is shown that the catalysts of this type can be prepared reproducibly and exhibit catalytic properties comparable to the properties of noble metal catalysts.

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Polymer oxidation catalyst containing acidic functional groups

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19811237 ◽

1981 ◽

Vol 46 (5) ◽

pp. 1237-1247

Author(s):

Zdeněk Prokop ◽

Karel Setínek

Keyword(s):

Functional Groups ◽

Elevated Temperatures ◽

Redox Properties ◽

Oxidation Catalyst ◽

Carbon Clusters ◽

Oxidation Activity ◽

Redox Sites ◽

Styrene Divinylbenzene ◽

Proportional Decrease ◽

Polymer Oxidation

The catalyst containing redox sites in addition to acid functional groups was prepared by sulphonation of a macroporous chloromethylated styrene-divinylbenzene copolymer with concentrated sulphuric acid at elevated temperatures. Its activity was tested for the oxidation of 2-propanol by molecular oxygen at 120 °C and was found to be comparable to that of the iridium on carbon catalyst.Neutralisation of acid functional groups by alkali metal led to proportional decrease in the oxidation activity. The results of EPR spectroscopic study of these catalysts show that the redox properties of the polymer are caused by carbon clusters which are capable of electron exchange.

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Adsorption of Vapours of Some Organic Compounds on Surface of Iron-Substituted Layered Vanadyl Phosphate

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20000047 ◽

2000 ◽

Vol 65 (1) ◽

pp. 47-57 ◽

Cited By ~ 1

Author(s):

Pavel Hradil ◽

Jiří Votinský ◽

Karel Komárek ◽

Vítězslav Zima ◽

Jaroslava Kalousová ◽

...

Keyword(s):

Organic Compounds ◽

Organic Molecules ◽

Ferric Ions ◽

Vanadyl Phosphate ◽

Enthalpy Of Adsorption ◽

Adsorbent Surface ◽

Specific Retention Volumes ◽

Specific Retention ◽

Retention Volumes ◽

Chromatographic Measurement

Gas chromatographic measurement of specific retention volumes of vapours of selected groups of organic compounds has been used to determine differential molar enthalpy of adsorption of their molecules on the surface of layered vanadyl phosphate substituted with ferric ions having the composition of [Fe(H2O)]0.20(VO)0.80PO4. Various types of bonds of the molecules to the surface of the layered adsorbent including their probable orientation with respect to the layers have been discussed. It was observed a dependence of the specific peak elution volume and shape of chromatographic peak on the sample size in the cases of those compounds whose molecules are chemically bound to the adsorbent surface. A connection is pointed out between the adsorption strength of the organic molecules on the layered adsorbent and the tendency of the system to undergo intercalation reaction.

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An Investigation on the Performance of an Oxidation Catalyst Using Two-dimensional Simulation with Detailed Reaction Mechanism

Chemical Product and Process Modeling ◽

10.1515/cppm-2019-0115 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Sreeharsh Nair ◽

Mayank Mittal

Keyword(s):

Single Channel ◽

Catalytic Converter ◽

Oxidation Catalyst ◽

Low Temperature Combustion ◽

Wide Range ◽

Detailed Reaction Mechanism ◽

Temperature Combustion ◽

High Concentrations ◽

Dimensional Simulation ◽

Surface Reaction Kinetics

AbstractThe advent of stricter emission standards has increased the importance of aftertreatment devices and the role of numerical simulations in the evolution of better catalytic converters in order to satisfy these emission regulations. In this paper, a 2-D numerical simulation of a single channel of the monolith catalytic converter is presented by using detailed surface reaction kinetics aiming to investigate the chemical behaviour inside the converter. The model has been developed to study the conversion of carbon monoxide (CO) in the presence of propene (C3H6) for low-temperature combustion (LTC) engine application. The inhibition effect of C3H6 over a wide range of CO inlet concentrations is investigated. Considering both low and high levels of CO concentration at the inlet, the 2-D model predicted better results than their corresponding 1-D counterparts when compared with the experimental data from literature. It was also observed that C3H6 inhibition at high temperatures was significant, particularly for high concentrations of CO compared to low concentrations of CO at the inlet.

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Optimal water concentration for aqueous Li+ intercalation in vanadyl phosphate

Chemical Science ◽

10.1039/d0sc04647g ◽

2021 ◽

Vol 12 (12) ◽

pp. 4450-4454

Author(s):

Dan Sun ◽

Masashi Okubo ◽

Atsuo Yamada

Keyword(s):

Water Concentration ◽

Vanadyl Phosphate

We demonstrate aqueous Li+ intercalation chemistry of vanadyl phosphate in the form of monohydrates, which are only stable in an optimal water-concentration environment.

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