Remarkably enhanced density and specific activity of active sites in Al-rich Cu-, Fe- and Co-beta zeolites for selective catalytic reduction of NOx

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F16%3A00458270" target="_blank" >RIV/61388955:_____/16:00458270 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.apcatb.2016.02.020" target="_blank" >http://dx.doi.org/10.1016/j.apcatb.2016.02.020</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcatb.2016.02.020" target="_blank" >10.1016/j.apcatb.2016.02.020</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Remarkably enhanced density and specific activity of active sites in Al-rich Cu-, Fe- and Co-beta zeolites for selective catalytic reduction of NOx

Popis výsledku v původním jazyce

The efficiency of catalysts for abatement of emissions of nitrogen oxides (NOx) from stationary and especially mobile sources using selective catalytic reduction (SCR) is obviously still not sufficient to meet increasingly more stringent environmental limits. We demonstrate that the conversion of NOx to nitrogen under the relevant conditions of the SCR-NOx can be dramatically increased using Al-rich beta zeolite catalysts with a high concentration of transition metal counter-ions, bearing extra-framework oxygen ligand (M/M-oxo, where M = Cu, Co, Fe), particularly in the low-temperature region as well as at high space velocities. The high concentration of framework Al and corresponding high population of AlSiAl sequences in template-free synthesized Al-rich beta zeolite does not result in relative increased binding of bare non-reducible and non-active M(II) ions. To the contrary, the unparalleled high concentration of the atomically dispersed M/M-oxo counter-ions with appropriate redox properties and enhanced specific activities provides 3–12 times higher reaction rates for the SCR-NOx using ammonia, methane and propane as reducing agents compared to state-of-the-art Si-rich zeolite catalysts.

Název v anglickém jazyce

Remarkably enhanced density and specific activity of active sites in Al-rich Cu-, Fe- and Co-beta zeolites for selective catalytic reduction of NOx

Popis výsledku anglicky

The efficiency of catalysts for abatement of emissions of nitrogen oxides (NOx) from stationary and especially mobile sources using selective catalytic reduction (SCR) is obviously still not sufficient to meet increasingly more stringent environmental limits. We demonstrate that the conversion of NOx to nitrogen under the relevant conditions of the SCR-NOx can be dramatically increased using Al-rich beta zeolite catalysts with a high concentration of transition metal counter-ions, bearing extra-framework oxygen ligand (M/M-oxo, where M = Cu, Co, Fe), particularly in the low-temperature region as well as at high space velocities. The high concentration of framework Al and corresponding high population of AlSiAl sequences in template-free synthesized Al-rich beta zeolite does not result in relative increased binding of bare non-reducible and non-active M(II) ions. To the contrary, the unparalleled high concentration of the atomically dispersed M/M-oxo counter-ions with appropriate redox properties and enhanced specific activities provides 3–12 times higher reaction rates for the SCR-NOx using ammonia, methane and propane as reducing agents compared to state-of-the-art Si-rich zeolite catalysts.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/TH01021259" target="_blank" >TH01021259: Katalytický proces pro úplnou likvidaci emisí oxidů dusíku pro technologie výroby kyseliny dusičné</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Applied Catalysis B - Environmental

ISSN

0926-3373

e-ISSN

—

Svazek periodika

189

Číslo periodika v rámci svazku

JUL 2016

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

65-74

Kód UT WoS článku

000374608300008

EID výsledku v databázi Scopus

2-s2.0-84958292399