Browse Publications Technical Papers 2019-01-0735
2019-04-02

Low-Temperature NH3 Storage, Isothermal Desorption, Reactive Consumption, and Thermal Release from Cu-SSZ-13 and V2O5-WO3/TiO2 Selective Catalytic Reduction Catalysts 2019-01-0735

Worldwide, regulations continue to drive reductions in brake-specific emissions of nitric oxide (NO) and nitrogen dioxide (NO2) from on-highway and nonroad diesel engines. NOx, formed as a byproduct of the combustion of fossil fuels (e.g., natural gas, gasoline, diesel, etc.), can be converted to diatomic nitrogen (N2) through ammonia (NH3) selective catalytic reduction (SCR). In this study, we closely examine the low-temperature storage, isothermal desorption, reactive consumption, and thermal decomposition of NH3 on a commercially available Cu-SSZ-13 SCR catalyst. Both catalyst core-reactor and diffuse reflectance Fourier transform infrared spectrometer (DRIFTS) experiments are utilized to investigate the fundamental chemical processes relevant to low-temperature (T < 250°C) NH3 SCR. Finally, results are compared to similar experiments conducted on a commercially available V-SCR catalyst, since these catalysts are also broadly used to reduce NOx emissions worldwide. The authors anticipate that the results presented herein can benefit the research communities' efforts to significantly lower NOx emissions in comparison to today's regulated limits.

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