沸石
化学
无机化学
吸附
氨
铜
催化作用
布朗斯特德-洛瑞酸碱理论
选择性
物理化学
有机化学
作者
Haiyang Zhu,Ja Hun Kwak,Charles H. F. Peden,János Szanyi
标识
DOI:10.1016/j.cattod.2012.08.043
摘要
DRIFT spectroscopy combined with mass spectrometry was used to investigate the oxidation of adsorbed ammonia by NO2, NO + O2 and NO2 + O2 on a copper ion exchanged SSZ-13 (Cu-SSZ-13) zeolite. Compared with both NO2 and NO, the adsorption of ammonia is much stronger on the Cu-SSZ-13 zeolite. Two adsorbed ammonia species were found over the Cu-SSZ-13 zeolite studied here, notably ammonia on Brønsted acid sites (proton) and ammonia on Lewis acid sites (copper ions). These adsorbed ammonia species present different activity profiles and selectivity to N2 during NH3 oxidation. The results obtained suggest that ammonia adsorbed onto copper ions in Cu-SSZ-13 is more active at low temperatures than proton-adsorbed NH3, and give rise to a higher selectivity to N2. The formation of N2O is associated primarily with the reaction of NOx with proton-adsorbed NH3 via the formation and subsequent thermal decomposition of NH4NO3.
科研通智能强力驱动
Strongly Powered by AbleSci AI