SCHEDULED MAINTENANCE
Selective catalytic reduction of NOx over micro-/meso-/macroporous Cu-SAPO-34†
*a
Kinga
Góra-Marek,
b
Marko
Bertmer,
c
Reinhard
Denecke,
d
Konstantin
Marcinowski,
a
Roger
Gläser
a
Abstract
Micro-/meso-/macroporous Cu-containing SAPO-34 was successfully prepared by the post-synthetic modification of a commercial support with diethylamine (DEA). The treatment in disodium ethylenediaminetetraacetate (Na2H2EDTA) did not yield a micro-/mesoporous material. The post-synthetic modification of SAPO-34 allows for the introduction of a higher content of copper species (1–2.6 wt%) compared to the unmodified material (0.5 wt%). Cu-SAPO-34_DEA exhibits the highest NO conversion below 250 °C, and the widest activity temperature window to achieve >80% of NO conversion (200–450 °C) during NH3-SCR-DeNOx. However, the presence of H2O in the feed was detrimental to all the materials. As evidenced by DR UV-vis and in situ XPS, the mobility of copper species and their accumulation in the internal part of SAPO-34 grains appeared with increasing temperature. By employing the rapid scan FT-IR approach, the consecutive reaction steps were identified in the first 300 s of NH3-SCR-DeNOx in the presence of H2O.
Please wait while we load your content...
