Wyniki wyszukiwania - BazTech

1

Zmniejszenie emisji podtlenku azotu z instalacji kwasu azotowego

Petryk J., Iwanek E., Krawczyk K., Piętka L.

Przemysł Chemiczny

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2012

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T. 91, nr 9

1757-1760

PL

Przedstawiono wyniki badań nad utlenianiem amoniaku na dwustopniowym układzie katalitycznym składającym się z siatek platynoworodowych i warstwy tlenkowego katalizatora kobaltowo-cerowego. Do badań wybrano katalizatory aktywne w wysokotemperaturowym rozkładzie podtlenku azotu. Przedmiotem badań była aktywność, selektywność i podaność na dezaktywację tych katalizatorów. Na dwustopniowym katalizatorze uzyskano wyższą niż na siatkach Pt-Rh sprawność utleniania amoniaku do NO i jednocześnie dziesięciokrotnie mniejsze straty amoniaku w postaci podtlenku azotu.

EN

NH₃ was oxidized at 760–840°C over a 2-stage catalyst system consisting of Pt-Rh gauze, followed by a catalyst composed of Ce and Co oxides. Use of the catalyst system resulted in a higher conversion to NO than on the Pt-Rh gauzes alone and a tenfold lower NH₃ losses due to N₂O formation.

2

Catalytic Decomposition of Nitrous Oxide

Wilczkowska E., Kowalczyk Z., Petryk J., Raróg-Pilecka W., Kaszkur Z.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 3

515-518

3

The Homogeneous Synthesis of N2O in Ammonia Oxidation Process

Petryk J., Kołakowska E.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 5

941-944

4

Ammonia Oxidation over Cobalt-Type Catalysts. Effect of La and Ce Loading

Petryk J., Kowalczyk Z., Kołakowska E., Jodzis S.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 10

1699-1703

5

Ozone synthesis under surface discharge conditions

Jodzis S., Petryk J.

Polish Journal of Applied Chemistry

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2005

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Vol. 49, nr 1-2

53-60

EN

Experiments concerning the applying of dielectric-metal mesh system in ozone synthesis process were carried out. The mixed surface-glow discharge was obtained. It was found that Teflon is especially interesting as a dielectric material although its life-time in conditions of ozone synthesis process is not long. Well developed discharge on Teflon surface was obtained. High ozone concentration was obtained.

6

Ozone synthesis under barrier discharge at high and low concentrations

Petryk J., Jodzis S., Zarębski W.

Polish Journal of Chemical Technology

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2002

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Vol. 4, nr 2

28-32

EN

The influence of discharge parameters on the obtained ozone concentration has been analysed by means of a simple model of synthesis under silent discharge conditions. The overall rate of ozone synthesis decreases with an increase in the ozone concentration. The maximum content of ozone is obtained when in specified conditions the rate of the reaction, in which ozone is formed will be equal with that of the reactions causing its decomposition. It has been found that for the model assumed, the temperature is the main parameter which influences the maximum ozone concentrations. The calculation models are often simplified, with omitting the endothermic effect of the ozone synthesis and without taking into account the rise in average molar specific heat of a gas mixture resulting from the presence of ozone in it besides oxygen. Calculations taking into account and then omitting the above parameters were carried out. It appears that their influence is insignificant, so the simplification of the model does not cause a significant error. This especially refers to the synthesis at low concentrations of ozone. Many times it has been experimentally found that at low ozone concentrations the better process efficiency, i.e. a little higher ozone concentration is obtained when the synthesis proceeds at a higher temperature (with maintaining the other experiment conditions invariable). This anomaly has been explained on the basis of experimental results and calculations using a simple model of the process. model of synthesis under silent discharge conditions. The overall rate of ozone synthesis decreases with an increase in the ozone concentration. The maximum content of ozone is obtained when in specified conditions the rate of the reaction, in which ozone is formed will be equal with that of the reactions causing its decomposition. It has been found that for the model assumed, the temperature is the main parameter which influences the maximum ozone concentrations. The calculation models are often simplified, with omitting the endothermic effect of the ozone synthesis and without taking into account the rise in average molar specific heat of a gas mixture resulting from the presence of ozone in it besides oxygen. Calculations taking into account and then omitting the above parameters were carried out. It appears that their influence is insignificant, so the simplification of the model does not cause a significant error. This especially refers to the synthesis at low concentrations of ozone. Many times it has been experimentally found that at low ozone concentrations the better process efficiency, i.e. a little higher ozone concentration is obtained when the synthesis proceeds at a higher temperature (with maintaining the other experiment conditions invariable). This anomaly has been explained on the basis of experimental results and calculations using a simple model of the process.

7

Utlenianie amoniaku w dwustopniowym układzie katalitycznym PtRh5 + Co3O4 pod ciśnieniem 0,46 MPa

Petryk J., Krawczyk K., Kozłowski K.

Przemysł Chemiczny

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1999

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T. 78, nr 9

329-331

8

The macrostructure and transformations of cobalt oxide catalyst for ammonia oxidation

Schmidt-Szałowski K., Krawczyk K., Petryk J.

Polish Journal of Applied Chemistry

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1999

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Vol. 43, nr 1-2

29-45

EN

Cobalt catalysts may be used in the future for ammonia oxidation to NO instead of platinum gauze. A new catalyst of high and stable activity and selectivity has been obtained from Co(3)On. On this catalyst much less nitrous oxide is produced than on platinum gauze. The effect of heat treatment of the catalyst's granules, made of CO(3)O(4) with organic binder, on their final composition and macrostructure has been studied (within 1000-l250°C). It has been found that the macrostructure of the catalyst has an essential effect on its activity and selectivity. The conversion of Co(3)O(4) into the inactive oxide CoO, proceeding in the reacting gas mixture of low ammonia conversion, is the main cause of the cobalt catalyst deactivation which is, however, reversible.

9

Wpływ liniowej prędkości przepływu gazu na przebieg procesu utleniania amoniaku na tlenkowym katalizatorze kobaltowym

Petryk J., Sadren J.

Przemysł Chemiczny

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1998

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T. 77, nr 1

11-14

10

Charakterystyka kinetyczna fluidalnej warstwy katalizatora kobaltowego do procesu utleniania amoniaku

Petryk J.

Przemysł Chemiczny

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1998

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T. 77, nr 12

455-457

11

Macrokinetics of the oxygen-ozone system under conditions of silent discharge

Jodzis S., Petryk J., Schmidt-Szałowski K.

Polish Journal of Applied Chemistry

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1998

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Vol. 42, nr 2

95-104

EN

The effect of essential parameters (active power consumption and temperature of electrodes) on the process of ozone synthesis was studied in temperature range 1- 50' C. A catalytic effect of granular dielectric packing, placed in the discharge gap, on the process efficiency was observed. High concentrations of ozone were obtained in presence of dielectric packing when the discharge (glass) electrodes were cooled down to 1st.C.

12

Kinetic model of ozone synthesis in silent discharges

Petryk J., Schmidt-Szałowski K.

Polish Journal of Applied Chemistry

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1998

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Vol. 42, nr 2

105-112

EN

A simplified kinetic model of ozone synthesis in a silent discharge is presented. The influence of the discharge gap width on the ozone concentration and the energetic efficiency achieved has been calculated for this model. From the calculations it appears that, in agreement with the results of experiments and industrial practice, better results are obtained in an ozonizer with a smaller gap. This is an effect only of higher heat transfer rate resulting in a lower temperature in the discharge gap.