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Research paper thumbnail of Physicochemical Features and NH3-SCR Catalytic Performance of Natural Zeolite Modified with Iron—The Effect of Fe Loading

Catalysts

In modern dual-pressure nitric acid plants, the tail gas temperature usually exceeds 300 °C. The ... more In modern dual-pressure nitric acid plants, the tail gas temperature usually exceeds 300 °C. The NH3-SCR catalyst used in this temperature range must be resistant to thermal deactivation, so commercial vanadium-based systems, such as V2O5-WO3 (MoO3)-TiO2, are most commonly used. However, selectivity of this material significantly decreases above 350 °C due to the increase in the rate of side reactions, such as oxidation of ammonia to NO and formation of N2O. Moreover, vanadium compounds are toxic for the environment. Thus, management of the used catalyst is complicated. One of the alternatives to commercial V2O5-TiO2 catalysts are natural zeolites. These materials are abundant in the environment and are thus relatively cheap and easily accessible. Therefore, the aim of the study was to design a novel iron-modified zeolite catalyst for the reduction of NOx emission from dual-pressure nitric acid plants via NH3-SCR. The aim of the study was to determine the influence of iron loading i...

Research paper thumbnail of a Instytut Nawozów Sztucznych, Puławy; b Uniwersytet Jagielloński, Kraków; c Université des Sciences et Technologies de Lille, Francja

Research paper thumbnail of Niskotemperaturowa redukcja emisji N2O z gazów resztkowych w wytwórniach kwasu azotowego

Research paper thumbnail of Geträgerter katalysator zur minderung von stickstoff(i)-oxidemissionen, insbesondere aus salpetersäurenanlagen und verfahren zu dessen herstellung

Research paper thumbnail of Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Catalysts, 2021

Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst ... more Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) in the temperature range of 150–450 °C. The catalyst was prepared at a laboratory scale in a powder form and then the series of experiments of its shaping into tablets was conducted. Physicochemical studies of the catalyst (N2 sorption at −196 °C, FT-IR, XRD, UV-vis) were performed to determine the textural and structural properties and identify the surface functional groups, the crystalline structure of the catalysts and the form and aggregation of the active phase. The activity tests over the shaped catalyst were performed industry-reflecting conditions, using tail gases from the pilot nitric acid plant. The influence of a temperature, catalyst load, and the amount of reducing agent (ammonia) on the NOx reduction process were investigated. The results of catalytic tests that were performed on model gas mixt...

Research paper thumbnail of Research on the shaping process of PKR-2 catalyst for a high-temperature N2O decomposition with using capillary rheometry

Chemical technology and engineering. Proceedings.2019.№1, 2019

PKR-2 catalyst for N 2 O abatement in HNO 3 plants is shaped by an extrusion process, from a mixt... more PKR-2 catalyst for N 2 O abatement in HNO 3 plants is shaped by an extrusion process, from a mixture of catalyst powder and plasticizing additives. The catalyst mass composition, allowing for its troublefree shaping on an industrial extruder and producing catalyst extrudates with the best mechanical parameters, was opimized using capillary rheometry. Кеуwords-N 2 O emission abatement, secondary catalyst, ammonia burner, rheological properties, PKR-2 catalyst mass, capillary rheometry, catalyst extrudates.

Research paper thumbnail of The application of RANS CFD for design of SNCR technology for a pulverized coal-fired boiler

Polish Journal of Chemical Technology, 2017

The article describes the technology of NOx emission abatement by SNCR method. The scope of resea... more The article describes the technology of NOx emission abatement by SNCR method. The scope of research included CDF simulations as well as design and construction of the pilot plant and tests of NOx reduction by urea in the plant located in industrial pulverized-coal fired boiler. The key step of research was to determine the appropriate temperature window for the SNCR process. The proposed solution of the location of injection lances in the combustion chamber enabled to achieve over a 30% reduction of NOx. It is possible to achieve higher effectiveness of the proposed SNCR technology and meet the required emission standards via providing prior reduction of NOx to the level of 350 mg/um3 using the primary methods.

Research paper thumbnail of Katalizator do niskotemperaturowego rozkładu tlenku azotu (I) ze strumienia gazów resztkowych z instalacji kwasu azotowego

Research paper thumbnail of Low temperature catalyst for nitrous oxide decomposition from nitric acid plant tail gases

Research paper thumbnail of Cobalt Spinel Catalyst for N2O Abatement in the Pilot Plant Operation–Long-Term Activity and Stability in Tail Gases

Industrial & Engineering Chemistry Research, 2014

Research paper thumbnail of Laboratory and pilot scale synthesis, characterization and reactivity of multicomponent cobalt spinel catalyst for low temperature removal of N2O from nitric acid plant tail gases

Catalysis Today, 2011

Synthesis of a multicomponent (K, Zn-doped) cobalt spinel deN2O catalyst developed in a laborator... more Synthesis of a multicomponent (K, Zn-doped) cobalt spinel deN2O catalyst developed in a laboratory was extended to a pilot scale. The optimal composition and morphology of the prototype catalyst elucidated in the laboratory conditions were successfully reproduced upon large scale synthesis and shaping. Tuning of the catalyst properties was guided by in situ work function measurements in conjunction with the

Research paper thumbnail of Physicochemical Features and NH3-SCR Catalytic Performance of Natural Zeolite Modified with Iron—The Effect of Fe Loading

Catalysts

In modern dual-pressure nitric acid plants, the tail gas temperature usually exceeds 300 °C. The ... more In modern dual-pressure nitric acid plants, the tail gas temperature usually exceeds 300 °C. The NH3-SCR catalyst used in this temperature range must be resistant to thermal deactivation, so commercial vanadium-based systems, such as V2O5-WO3 (MoO3)-TiO2, are most commonly used. However, selectivity of this material significantly decreases above 350 °C due to the increase in the rate of side reactions, such as oxidation of ammonia to NO and formation of N2O. Moreover, vanadium compounds are toxic for the environment. Thus, management of the used catalyst is complicated. One of the alternatives to commercial V2O5-TiO2 catalysts are natural zeolites. These materials are abundant in the environment and are thus relatively cheap and easily accessible. Therefore, the aim of the study was to design a novel iron-modified zeolite catalyst for the reduction of NOx emission from dual-pressure nitric acid plants via NH3-SCR. The aim of the study was to determine the influence of iron loading i...

Research paper thumbnail of a Instytut Nawozów Sztucznych, Puławy; b Uniwersytet Jagielloński, Kraków; c Université des Sciences et Technologies de Lille, Francja

Research paper thumbnail of Niskotemperaturowa redukcja emisji N2O z gazów resztkowych w wytwórniach kwasu azotowego

Research paper thumbnail of Geträgerter katalysator zur minderung von stickstoff(i)-oxidemissionen, insbesondere aus salpetersäurenanlagen und verfahren zu dessen herstellung

Research paper thumbnail of Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants

Catalysts, 2021

Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst ... more Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) in the temperature range of 150–450 °C. The catalyst was prepared at a laboratory scale in a powder form and then the series of experiments of its shaping into tablets was conducted. Physicochemical studies of the catalyst (N2 sorption at −196 °C, FT-IR, XRD, UV-vis) were performed to determine the textural and structural properties and identify the surface functional groups, the crystalline structure of the catalysts and the form and aggregation of the active phase. The activity tests over the shaped catalyst were performed industry-reflecting conditions, using tail gases from the pilot nitric acid plant. The influence of a temperature, catalyst load, and the amount of reducing agent (ammonia) on the NOx reduction process were investigated. The results of catalytic tests that were performed on model gas mixt...

Research paper thumbnail of Research on the shaping process of PKR-2 catalyst for a high-temperature N2O decomposition with using capillary rheometry

Chemical technology and engineering. Proceedings.2019.№1, 2019

PKR-2 catalyst for N 2 O abatement in HNO 3 plants is shaped by an extrusion process, from a mixt... more PKR-2 catalyst for N 2 O abatement in HNO 3 plants is shaped by an extrusion process, from a mixture of catalyst powder and plasticizing additives. The catalyst mass composition, allowing for its troublefree shaping on an industrial extruder and producing catalyst extrudates with the best mechanical parameters, was opimized using capillary rheometry. Кеуwords-N 2 O emission abatement, secondary catalyst, ammonia burner, rheological properties, PKR-2 catalyst mass, capillary rheometry, catalyst extrudates.

Research paper thumbnail of The application of RANS CFD for design of SNCR technology for a pulverized coal-fired boiler

Polish Journal of Chemical Technology, 2017

The article describes the technology of NOx emission abatement by SNCR method. The scope of resea... more The article describes the technology of NOx emission abatement by SNCR method. The scope of research included CDF simulations as well as design and construction of the pilot plant and tests of NOx reduction by urea in the plant located in industrial pulverized-coal fired boiler. The key step of research was to determine the appropriate temperature window for the SNCR process. The proposed solution of the location of injection lances in the combustion chamber enabled to achieve over a 30% reduction of NOx. It is possible to achieve higher effectiveness of the proposed SNCR technology and meet the required emission standards via providing prior reduction of NOx to the level of 350 mg/um3 using the primary methods.

Research paper thumbnail of Katalizator do niskotemperaturowego rozkładu tlenku azotu (I) ze strumienia gazów resztkowych z instalacji kwasu azotowego

Research paper thumbnail of Low temperature catalyst for nitrous oxide decomposition from nitric acid plant tail gases

Research paper thumbnail of Cobalt Spinel Catalyst for N2O Abatement in the Pilot Plant Operation–Long-Term Activity and Stability in Tail Gases

Industrial & Engineering Chemistry Research, 2014

Research paper thumbnail of Laboratory and pilot scale synthesis, characterization and reactivity of multicomponent cobalt spinel catalyst for low temperature removal of N2O from nitric acid plant tail gases

Catalysis Today, 2011

Synthesis of a multicomponent (K, Zn-doped) cobalt spinel deN2O catalyst developed in a laborator... more Synthesis of a multicomponent (K, Zn-doped) cobalt spinel deN2O catalyst developed in a laboratory was extended to a pilot scale. The optimal composition and morphology of the prototype catalyst elucidated in the laboratory conditions were successfully reproduced upon large scale synthesis and shaping. Tuning of the catalyst properties was guided by in situ work function measurements in conjunction with the

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