Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 16, Pages 7375-7382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b06708
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Funding
- INCOE (International Network of Centers of Excellence) project
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A Cu-containing CHA-type zeolite was prepared via aqueous ion exchange of the CHA zeolite from organic template-free synthesis. The thus-obtained template-free Cu-CHA showed the best catalytic performance (i.e., high low- and high-temperature reactivity, wide temperature-window, and high hydrothermal stability) in ammonia selective catalytic reduction (NH3-SCR) of NOx among three investigated Cu-CHA zeolites. Different Cu ion distributions of these Cu-CHA catalysts were confirmed by deconvolution of NO adsorbed Fourier transform infrared spectra; the Cu-containing template-free CHA catalyst has a high amount of isolated Cu2+ in a six-membered ring (6MR). Furthermore, the framework Al distribution is investigated by Si-29 MAS NMR analysis, indicating that the catalyst has a high fraction of paired Al sites, which stabilize Cu2+ ions in the 6MR, leading to a high ability to resist the harsh hydrothermal aging.
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