- Tytuł:
- The influence of holmium on catalytic properties of Fe or Cu-modified vermiculites
- Autorzy:
-
Samojeden, Bogdan
Grzybek, Teresa
Kowal, Joanna
Szymaszek, Agnieszka
Jabłońska, Magdalena
Gläser, Roger
Motak, Monika - Powiązania:
- https://bibliotekanauki.pl/articles/109844.pdf
- Data publikacji:
- 2019
- Wydawca:
- Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
- Tematy:
-
selective catalytic reduction
deNOx
holmium
vermiculite - Opis:
- Natural layered clay, vermiculite, was modified and tested as catalyst for the selective catalytic reduction of NOx with ammonia (NH3-SCR). Its modification included the application of the blowing agent (azodicarbonamide), acid treatment and pillaring with Al2O3. Active phase (transition metals: Cu or Fe) was introduced via impregnation. The obtained materials were characterized by N2 sorption (texture), XRD (structure), DR-UV-Vis (oxidation state and aggregation of the active phase), H2-TPR (reducibility of the active phase), in situ DRIFTS (types of adsorbed species due to contact of the sample NH3) and NH3-TPD (type/strength of the acidic sites). The initial modification procedures (treatment with azodicarboamide) resulted in the increase of specific surface area of vermiculite. The introduction of transition metal ions provided a significant amount of acidic sites. The promoting impact of holmium was confirmed by the increased strength of the sites. The highest catalytic activity was exhibited by the sample Fe-containing vermiculite and doped with Ho.
- Źródło:
-
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1484-1495
1643-1049
2084-4735 - Pojawia się w:
- Physicochemical Problems of Mineral Processing
- Dostawca treści:
- Biblioteka Nauki
Artykuł