Issue 6, 2022

Understanding the superior NH3-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

Abstract

Synthesizing CHA-type zeolite via template-free interzeolite transformation has been considered as a green method, but the resultant zeolite exhibits low activity in the selective catalytic reduction of NOx by ammonia (NH3-SCR). Herein we report a highly active NH3-SCR catalyst (Cu-CHAUSY) derived from CHA-type zeolite (CHAUSY) that is synthesized via template-free interzeolite transformation from ultra-stable Y (USY). The ultra-high activity is attributed to the specific silicon and aluminum configurations in USY which are distinctly different from those in the conventionally used parent NaY, although they have similar SiO2/Al2O3 ratios. This characteristic endows CHAUSY with more single Al atoms in a six-membered ring, benefiting the self-reduction of [Cu(OH)]+ and the activation of O2 during the NH3-SCR reaction. Moreover, Cu-CHAUSY is demonstrated to outperform the two reference catalysts prepared from the aluminosilicate gel by conventional hydrothermal crystallization with the assistance of organic templates. Our work provides a new strategy for preparing highly active NH3-SCR catalysts.

Graphical abstract: Understanding the superior NH3-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

Supplementary files

Article information

Article type
Research Article
Submitted
09 Xim 2021
Accepted
07 Nah 2022
First published
08 Nah 2022

Inorg. Chem. Front., 2022,9, 1300-1312

Understanding the superior NH3-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

N. Lv, C. Sun, X. Wang, C. Wang, Y. Yue and X. Bao, Inorg. Chem. Front., 2022, 9, 1300 DOI: 10.1039/D1QI01414E

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