Continuous N<sub>2</sub>O Capture and Reduction to\nN<sub>2</sub> Using Ca-Zeolite Adsorbent and Pd/La/Al<sub>2</sub>O<sub>3</sub> Reduction Catalyst

There is an urgent need to develop effective methods\nfor converting\nnitrous oxide (N<sub>2</sub>O) into nonharmful N<sub>2</sub> because\nN<sub>2</sub>O is a potent greenhouse gas, and its increasing concentration\nin the atmosphere is a major concern for global warming. In this study,\nwe developed a two-step N<sub>2</sub>O capture and reduction system,\nemploying CaO-incorporated zeolites (Ca-zeolites) as N<sub>2</sub>O adsorbents and Pd nanoparticles on La-containing Al<sub>2</sub>O<sub>3</sub> (Pd/La/Al<sub>2</sub>O<sub>3</sub>) as catalysts for\nN<sub>2</sub>O reduction. This process is suitable for continuous\noperation over a temperature swing of 50–150 °C. The N<sub>2</sub>O capture capacity and subsequent reduction ability were preserved\nfor at least 15 h (10 cycles). Notably, this system can operate at\nlow temperatures (below 150 °C) using a simple temperature-swing\nprocess in the presence of O<sub>2</sub>.