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- Title
Functionalization of SSZ-13 and Fe-Beta with Copper by NH<sub>3</sub> and NO Facilitated Solid-State Ion-Exchange.
- Authors
Shishkin, Alexander; Shwan, Soran; Pingel, Torben Nilsson; Olsson, Eva; Clemens, Anna; Carlsson, Per-Anders; Härelind, Hanna; Skoglundh, Magnus
- Abstract
We show that functionalization of SSZ-13 (CHA) and Fe-beta (*BEA) with copper using a recently reported solid-state ion-exchange method, facilitated by NH3 and nitrogen oxides (NO), is a viable route to prepare Cu-SSZ-13 and (Cu + Fe)-beta catalysts, starting from H-SSZ-13 and Fe-beta, respectively. The physicochemical properties of the prepared catalysts are characterized by XRD, UV-Vis-spectroscopy and STEM-EDS, confirming that copper originally present in the physical mixture of CuO and H-SSZ-13, and CuO and Fe-beta, is inserted into the micropores of SSZ-13 and Fe-beta, respectively. Activity measurements in gas-flow reactor show that the samples are active for NO reduction by NH3-SCR over a broad temperature range, i.e., 150-500 °C. For the Cu-SSZ-13 catalysts, which have a copper loading range of 0.5-4 wt. %, the sample prepared from the physical mixture with a CuO/SSZ-13 ratio corresponding to 2 wt.% Cu is the most active catalyst for NH3-SCR under the present reaction conditions. Furthermore, the (Cu + Fe)-beta catalyst shows higher NH3-SCR activity over a broader temperature range and especially at low temperature as compared to the Fe-beta and Cu-beta counterparts. The results encourage further elaboration on sequential ion-exchange procedures for bimetallic functionalization of zeolites.
- Subjects
COPPER; COPPER catalysts; NITROGEN oxides; SOLID state chemistry; CATALYSTS; ION exchange (Chemistry)
- Publication
Catalysts (2073-4344), 2017, Vol 7, Issue 8, p232
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal7080232