TY - JOUR AU - Alsobaai, A. PY - 2017/03/01 Y2 - 2024/03/29 TI - Storage of Nitrous Oxide (NOx) in Diesel Engine Exhaust Gas using Alumina-Based Catalysts: Preparation, Characterization, and Testing JF - The Journal of Engineering Research [TJER] JA - Jou. Eng. Res. VL - 14 IS - 1 SE - Articles DO - 10.24200/tjer.vol14iss1pp64-73 UR - https://journals.squ.edu.om/index.php/tjer/article/view/187 SP - 64-73 AB - <p class="p1">This work investigated the nitrous oxide (NOx) storage process using alumina-based catalysts (K<span class="s1">2</span> O/Al<span class="s1">2</span> O<span class="s1">3</span> , CaO/Al<span class="s1">2</span> O<span class="s1">3, </span> and BaO/Al<span class="s1">2</span> O<span class="s1">3</span> ). The feed was a synthetic exhaust gas containing 1,000 ppm of nitrogen monoxide (NO), 1,000 ppm i-C<span class="s1">4</span> H<span class="s1">10</span> , and an 8% O<span class="s1">2 </span> and N<span class="s1">2 </span> balance. The catalyst was carried out at temperatures between 250–450°C and a contact time of 20 minutes. It was found that NOx was effectively adsorbed in the presence of oxygen. The NOx storage capacity of K<span class="s1">2</span> O/Al<span class="s1">2</span> O<span class="s1">3 </span>was higher than that of BaO/Al<span class="s1">2</span> O<span class="s1">3. </span> The NOx storage capacity for K<span class="s1">2</span> O/Al<span class="s1">2</span> O<span class="s1">3 </span> decreased with increasing temperature and achieved a maximum at 250°C. Potassium loading higher than 15% in the catalyst negatively affected the morphological properties. The combination of Ba and K loading in the catalyst led to an improvement in the catalytic activity compared to its single metal catalysts. As a conclusion, mixed metal oxide was a potential catalyst for de-NOx process in meeting the stringent diesel engine exhaust emissions regulations. The catalysts were characterized by a number of techniques and measurements, such as X-ray diffraction (XRD), electron affinity (EA), a scanning electron microscope (SEM), Brunner-Emmett-Teller (BET) to measure surface area, and pore volume and pore size distribution assessments.</p><p class="p1"> </p> ER -