Integrated DeNOx–DeSoot Catalytic Systems with Improved Low-Temperature Performanceстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 11 января 2018 г.
Аннотация:Performance of the combined catalysts [CeO2–
ZrO2 + FeBETA] and [Mn/CeO2–ZrO2 + FeBETA], prepared
by mechanical mixing of the component powders, was
studied in soot oxidation and NH3-SCR. [CeO2–ZrO2 +
FeBETA] catalyst (with component volumetric ratio of 3/1)
demonstrated efficient soot oxidation at 400–450 C and
DeNOx performance similar to that of FeBETA catalyst,
despite the fact that the amount of zeolite was reduced by
four times indicating a strong synergistic effect between
the components. Low-temperature DeNOx performance of
the [CeO2–ZrO2 + FeBETA] system can be additionally
enhanced by doping the CeO2–ZrO2 with Mn. It was found
that NOx conversion over [Mn/CeO2–ZrO2 + FeBETA] at
150–250 C was steadily improved by increasing the Mn
loading, and [5.4 % Mn/CeO2–ZrO2 + FeBETA] attained
NOx conversion above 90 % at Treact *190 C. Comparative
studies of soot oxidation and NH3-SCR over combined
catalysts and individual components indicated that the soot
oxidation activity is assigned to the soot oxidation over
ceria–zirconia component, while enhanced low-temperature
SCR performance is a result of a ‘‘bi-functional’’ SCR
mechanism comprising NO oxidation to NO2 over CeO2–
ZrO2 component followed by fast-SCR over FeBETA.