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Must the Best Laboratory Prepared Catalyst Also Be the Best in an Operational Application?

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27730%2F19%3A10242033" target="_blank" >RIV/61989100:27730/19:10242033 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/61989100:27710/19:10242033

  • Výsledek na webu

    <a href="https://www.mdpi.com/2073-4344/9/2/160" target="_blank" >https://www.mdpi.com/2073-4344/9/2/160</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.3390/catal9020160" target="_blank" >10.3390/catal9020160</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Must the Best Laboratory Prepared Catalyst Also Be the Best in an Operational Application?

  • Popis výsledku v původním jazyce

    Three cobalt mixed oxide deN2O catalysts, with optimal content of alkali metals (K, Cs), were prepared on a large scale, shaped into tablets, and tested in a pilot plant reactor connected to the bypassed tail gas from the nitric production plant, downstream from the selective catalytic reduction of NOx by ammonia (SCR NOx/NH3) catalyst. High efficiency in N2O removal (N2O conversion of 75-90% at 450 oC, VHSV = 11,000 m3 mbed MINUS SIGN 3 h MINUS SIGN 1 ) was achieved. However, a different activity order of the commercially prepared catalyst tablets compared to the laboratory prepared catalyst grains was observed. Catalytic experiments in the kinetic regime using laboratory and commercial prepared catalysts and characterization methods (XRD, TPR-H2, physisorption, and chemical analysis) were utilized to explain this phenomenon. Experimentally determined internal effectiveness factors and their general dependency on kinetic constants were evaluated to discuss the relationship between the catalyst activity in the kinetic regime and the internal diffusion limitation in catalyst tablets as well as their morphology. The theoretical N2O conversion as a function of the intrinsic kinetic constants and diffusion rate, expressed as effective diffusion coefficients, was evaluated to estimate the final catalyst performance on a large scale and to answer the question of the above article title.

  • Název v anglickém jazyce

    Must the Best Laboratory Prepared Catalyst Also Be the Best in an Operational Application?

  • Popis výsledku anglicky

    Three cobalt mixed oxide deN2O catalysts, with optimal content of alkali metals (K, Cs), were prepared on a large scale, shaped into tablets, and tested in a pilot plant reactor connected to the bypassed tail gas from the nitric production plant, downstream from the selective catalytic reduction of NOx by ammonia (SCR NOx/NH3) catalyst. High efficiency in N2O removal (N2O conversion of 75-90% at 450 oC, VHSV = 11,000 m3 mbed MINUS SIGN 3 h MINUS SIGN 1 ) was achieved. However, a different activity order of the commercially prepared catalyst tablets compared to the laboratory prepared catalyst grains was observed. Catalytic experiments in the kinetic regime using laboratory and commercial prepared catalysts and characterization methods (XRD, TPR-H2, physisorption, and chemical analysis) were utilized to explain this phenomenon. Experimentally determined internal effectiveness factors and their general dependency on kinetic constants were evaluated to discuss the relationship between the catalyst activity in the kinetic regime and the internal diffusion limitation in catalyst tablets as well as their morphology. The theoretical N2O conversion as a function of the intrinsic kinetic constants and diffusion rate, expressed as effective diffusion coefficients, was evaluated to estimate the final catalyst performance on a large scale and to answer the question of the above article title.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    20402 - Chemical process engineering

Návaznosti výsledku

  • Projekt

    Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2019

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Catalysts

  • ISSN

    2073-4344

  • e-ISSN

  • Svazek periodika

    9

  • Číslo periodika v rámci svazku

    2

  • Stát vydavatele periodika

    CH - Švýcarská konfederace

  • Počet stran výsledku

    18

  • Strana od-do

    160

  • Kód UT WoS článku

    000460702200054

  • EID výsledku v databázi Scopus