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Co-beta Zeolite Highly Active in Propane-SCR-NOx in the Presence of Water Vapor: Effect of Zeolite Preparation and Al Distribution in the Framework

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F04%3A00107577" target="_blank" >RIV/61388955:_____/04:00107577 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Co-beta Zeolite Highly Active in Propane-SCR-NOx in the Presence of Water Vapor: Effect of Zeolite Preparation and Al Distribution in the Framework

  • Original language description

    CoNH4-beta and CoH-beta zeolites, with various Co loadings were prepared by Co ion exchange into NH4- and H-beta parent zeolites, from which the template was removed by calcination of the as-synthesized beta zeolite in a stream of ammonia and oxygen, respectively. It has been found that the CoNH4-beta zeolites, in contrast to CoH-beta zeolites, exhibited high and stable activity in selective catalytic reduction of NOx with propane in the presence of water vapor (10 %). To analyze the reasons of the exceptional activity of CoNH4-beta zeolites, both zeolite preparations were studied with respect to the state and location of aluminium, character of Al-related acid sites and Co ion exchange capacity by means of FTIR spectra of OH groups of dehydrated zeolites and those after adsorption of d3-acetonitrile, 29Si , 27Al and 27Al 3Q MAS NMR spectra. It has been shown that the procedure of template removal in an ammonia stream (in contrast to standard calcination in oxygen).

  • Czech name

    Co-beta zeolit vysoce aktivní v reakci propan-SCR-NOx v přítomnosti vodní páry: efekt přípravy zeolitu a distribuce Al ve skeletu

  • Czech description

    CoNH4-beta andCoH-beta zeolity s různou koncentrací kobaltu, byly připraveny iontovou výměnou výchozích NH4- a H-beta zeolitů, ze kterých byl odstraněn templát kalcinací syntetizovaného beta zeolitu v proudu amoniaku a kyslíku, resp. Bylo zjištěno, že CoNH4-beta zeolity, ve srovnání s CoH-beta zeolity, vykazují vysokou a stabilní aktivitu v selektivní katalytické redukci NOx propanem v přítomnosti vodní páry (10 %). Z důvodu analýzy této vyjímečné aktivity CoNH4-beta zoelitů, obě přípravy zeolitů byly studovány ve vztahu ke stavu, lokalizaci a charakteru Al-typů kyselých center, a Co-iontové kapacity pomocí FTIR spekter OH skupin dehydratovaných zeolitů a po adsorpci d3-acetonitrilu a 29Si, 27Al a 27Al 3Q MAS NMR spectra. Postup odstranění templátu s použitím amoniaku vyrovnává negativní náboj skeletu NH4+ ionty a tím zamezuje perturbaci a dealuminace skeletu. Co-beta zeolit s vysokou koncentrací Td koordinovaných Al atomů ve skeletu (CoNH4-BERA) obsahuje vedle "holých" Co iontů tak...

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/1P04OCD15.20" target="_blank" >1P04OCD15.20: Metal ion structures in crystalline matrices. Synthesis/structure/activity/selectivity relationship for development of catalysts for highly specific catalytic reactions.</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2004

  • Confidentiality

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

Data specific for result type

  • Name of the periodical

    Journal of Catalysis

  • ISSN

    0021-9517

  • e-ISSN

  • Volume of the periodical

    227

  • Issue of the periodical within the volume

    2

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    15

  • Pages from-to

    352-366

  • UT code for WoS article

  • EID of the result in the Scopus database