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Functionalization of SSZ-13 and Fe-Beta with copper by NH3 and NO facilitated solid-state ion-exchange

Alexander Shishkin (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Soran Shwan (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Torben Pingel (Institutionen för fysik, Eva Olsson Group (Chalmers) ; Kompetenscentrum katalys (KCK)) ; Eva Olsson (Institutionen för fysik, Eva Olsson Group (Chalmers) ; Kompetenscentrum katalys (KCK)) ; Anna Clemens (Institutionen för fysik (Chalmers) ; Kompetenscentrum katalys (KCK)) ; Per-Anders Carlsson (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Hanna Härelind (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Catalysts (2073-4344). Vol. 7 (2017), 8, p. 1-10.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Solid-state ion-exchange; Copper; Iron; Zeolite; CHA; BEA; NH3-SCR; NOx-reduction



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Denna post skapades 2017-08-17. Senast ändrad 2017-09-14.
CPL Pubid: 251252

 

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