Selective catalytic reduction of NOx over micro-/meso-/macroporous Cu-SAPO-34. Issue 22 (21st October 2022)

• Record Type: Journal Article
• Authors: Jabłońska, Magdalena; Góra-Marek, Kinga; Fernadi Lukman, Muhammad; Tarach, Karolina; Bertmer, Marko; Denecke, Reinhard; Poppitz, David; Marcinowski, Konstantin; Pöppl, Andreas; Gläser, Roger
• Is Part Of: Catalysis science & technology. Volume 12:Issue 22(2022)
• Page Start: 6660
• Page End: 6675
• Publication Date: 2022-10-21
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy01548j
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Micro-/meso-/macroporous Cu-containing SAPO-34 prepared by the post-synthetic modification of a commercial support with diethylamine (DEA), shows enhanced activity in NH3 -SCR-DeNO x . 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 (Na2 H2 EDTA) 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-DeNO x . However, the presence of H2 O 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-DeNO x in the presence of H2 O.