Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 27, Pages 12304-12312Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b05808
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Funding
- National Natural Science Foundation of China [21473064]
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The cold start wetting effect on Cu-SSZ-13 has been simulated via soaking catalysts with various Si/Al ratios in ammonium water at disparate pH levels. It is found that a mild treatment (pH = 9) has little effect on the selective catalytic reduction of NOx with NH3 performance of Cu-SSZ-13. However, on increasing the pH to 12, the deNOx activity and resistant ability to hydrothermal aging decrease obviously. Such a decrease could be attributed to the desilication phenomenon during the soaking process, which results in a number of effects including extraction of Cu2+ ions from the exchange sites, decrease in acidity, and damage to the zeolite structure. Meanwhile, the alkaline treatment exhibits distinct impacts on the physicochemical properties of Cu-SSZ-13 with different Si/Al ratios. The low Si/Al ratio catalyst (Si/Al-6) is insusceptible to desilication because of a higher content of the AlO4- structure and extra-framework Al (Alef), which could hamper the desilication.
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