DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

Jodłowski, Przemysław J.; Kuterasiński, Łukasz; Jędrzejczyk, Roman J.; Chlebda, Damian K.; Gancarczyk, A.; Basąg, Sylwia; Chmielarz, Lucjan

doi:10.3390/catal7070205

Cited by 16 publications

(11 citation statements)

References 34 publications

(43 reference statements)

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“…Copper belongs among the most promising active components of the low-temperature NH 3 -SCR catalysts [1], especially in the case of copper deposited into zeolites [6][7][8][9][10]. It is not surprising, taking into account the ion-exchange properties of zeolites important for the deposition of metal in highly dispersed forms, surface acidity important for chemisorption and the activation of basic ammonia molecules, high surface area and uniform porous structure important to generate large number of active sites.…”

Section: Introductionmentioning

confidence: 99%

Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process

et al. 2020

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The main goal of the study was the development of effective catalysts for the low-temperature selective catalytic reduction of NO with ammonia (NH3-SCR), based on ferrierite (FER) and its delaminated (ITQ-6) and silica-intercalated (ITQ-36) forms modified with copper. The copper exchange zeolitic samples, with the intended framework Si/Al ratio of 30 and 50, were synthetized and characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low-temperature N2 adsorption), form and aggregation of deposited copper species (UV-vis-DRS), surface acidity (NH3-TPD) and reducibility (H2-TPR). The samples of the Cu-ITQ-6 and Cu-ITQ-36 series were found to be significantly more active NH3-SCR catalysts compared to Cu-FER. The activity of these catalysts in low-temperature NH3-SCR was assigned to the significant contribution of highly dispersed copper species (monomeric cations and small oligomeric species) catalytically active in the oxidation of NO to NO2, which is necessary for fast-SCR. The zeolitic catalysts, with the higher framework alumina content, were more effective in high-temperature NH3-SCR due to their limited catalytic activity in the side reaction of ammonia oxidation.

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Section: Introductionmentioning

confidence: 99%

Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process

et al. 2020

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“…The parent zeolite samples were prepared according to the method described in detail in our previous paper [34] and in Section 4. Materials and Results.…”

Section: Catalysts Preparation and Characterizationmentioning

confidence: 99%

Experimental and Theoretical Studies of Sonically Prepared Cu–Y, Cu–USY and Cu–ZSM-5 Catalysts for SCR deNOx

et al. 2021

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The objective of our study was to prepare Y-, USY- and ZSM-5-based catalysts by hydrothermal synthesis, followed by copper active-phase deposition by either conventional ion-exchange or ultrasonic irradiation. The resulting materials were characterized by XRD, BET, SEM, TEM, Raman, UV-Vis, monitoring ammonia and nitrogen oxide sorption by FT-IR and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). XRD data confirmed the purity and structure of the Y/USY or ZSM-5 zeolites. The nitrogen and ammonia sorption results indicated that the materials were highly porous and acidic. The metallic active phase was found in the form of cations in ion-exchanged zeolites and in the form of nanoparticle metal oxides in sonochemically prepared catalysts. The latter showed full activity and high stability in the SCR deNOx reaction. The faujasite-based catalysts were fully active at 200–400 °C, whereas the ZSM-5-based catalysts reached 100% activity at 400–500 °C. Our in situ DRIFTS experiments revealed that Cu–O(NO) and Cu–NH3 were intermediates, also indicating the role of Brønsted sites in the formation of NH4NO3. Furthermore, the results from our experimental in situ spectroscopic studies were compared with DFT models. Overall, our findings suggest two possible mechanisms for the deNOx reaction, depending on the method of catalyst preparation (i.e., conventional ion-exchange vs. ultrasonic irradiation).

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“…First, the appropriate catalysts were prepared. For selective catalytic reduction of NO with NH 3 (SCR deNOx), ultrastabilized Y-type zeolite (USY) was synthesized under rigorous conditions, then subjected to the sonochemical irradiation with 0.5 M aqueous copper nitrate solutions (for details see [31]), denoted as Cu/USY/s. For CH 4 combustion, a palladium catalyst (Pd/ZrO 2 ) was prepared by impregnation, also using a sonochemically irradiated catalyst precursor (for details see [34]).…”

Section: Kinetic Testsmentioning

confidence: 99%

“…Kinetic tests for both catalysts were performed using a Catlab (Hiden Analytical, Warrington, UK) fixed-bed quartz tubular test reactor. For SCR deNOx, the experiments were carried out at atmospheric pressure within a temperature range of 50-550 • C using a gas mixture containing 2500 ppm of NO, 2500 ppm of NH 3, and 25,000 ppm of O 2 balanced by helium, with a total flow rate of 40 mL/min [31]. For methane catalytic combustion tests, the temperature ranged from 100 • C to 550 • C and gas composition was set to 2000 ppm CH 4 /Air [35].…”

Section: Kinetic Testsmentioning

confidence: 99%

Metal Foams as Novel Catalyst Support in Environmental Processes

et al. 2019

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Metal foams are considered as promising catalyst carriers due to their high porosity, large specific surface area, and satisfactory thermal and mechanical stability. The study presents heat transfer and pressure drop experiments performed for seven foams of different pore densities made from diverse metals. Mass transfer characteristics are derived using the Chilton–Colburn analogy. It was found that the foams display much more intense heat/mass transfer than a monolith, comparable to packed bed. Next, the foams’ efficiencies have been compared, using 1D reactor modeling, in catalytic reactions displaying either slower (selective catalytic reduction of NOx) or faster kinetics (catalytic methane combustion). For the slow kinetics, the influence of carrier specific surface area at which catalyst can be deposited (i.e., catalyst amount) was decisive to achieve high process conversion and short reactor. For this case, monolith appears as the best choice assuming it’s the lowest pressure drop. For the fast reaction, the mass transfer becomes the limiting parameter, thus solid foams are the best solution.

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DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

Cited by 16 publications

References 34 publications

Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process

Ferrierite and Its Delaminated and Silica-Intercalated Forms Modified with Copper as Effective Catalysts for NH3-SCR Process

Experimental and Theoretical Studies of Sonically Prepared Cu–Y, Cu–USY and Cu–ZSM-5 Catalysts for SCR deNOx

Metal Foams as Novel Catalyst Support in Environmental Processes

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