Low-Temperature NH<sub>3</sub> Storage, Isothermal Desorption, Reactive Consumption, and Thermal Release from Cu-SSZ-13 and V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> Selective Catalytic Reduction Catalysts
作者：Nathan Ottinger, Yuanzhou Xi, Christopher J. Keturakis, Z. Gerald Liu · 发表于：SAE technical papers on CD-ROM/SAE technical paper series · 年份：2019 · DOI：10.4271/2019-01-0735 · 被引用次数：2 · 研究领域：Catalytic Processes in Materials Science、Ammonia Synthesis and Nitrogen Reduction、Caching and Content Delivery
<div class="section abstract"><div class="htmlview paragraph">Worldwide, regulations continue to drive reductions in brake-specific emissions of nitric oxide (NO) and nitrogen dioxide (NO<sub>2</sub>) from on-highway and nonroad diesel engines. NO<sub>x</sub>, formed as a byproduct of the combustion of fossil fuels (e.g., natural gas, gasoline, diesel, etc.), can be converted to dinitrogen (N<sub>2</sub>) through ammonia (NH<sub>3</sub>) selective catalytic reduction (SCR). In this study, we closely examine the low-temperature storage, isothermal desorption, reactive consumption, and thermal release of NH<sub>3</sub> on commercial Cu-SSZ-13 and V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> SCR catalysts. Catalyst core-reactor, N<sub>2</sub> adsorption (BET) surface area, and in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) experiments are utilized to investigate the fundamental chemical processes relevant to low-temperature (T &lt; 250°C) NH<sub>3</sub> SCR. Results show that NH<sub>3</sub> stored at low-temperature continuously, yet slowly releases from the SCR catalysts, and that nearly all of the weakly bound NH<sub>3</sub> stored on Cu<sup>2+</sup> sites of the Cu-SSZ-13 catalyst will isothermally desorb from the catalyst in the absence of NO<sub>...