Unambiguous evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion in CuZSM-5 zeolite
Unambiguous evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion in CuZSM-5 zeolite
复制标题
DOI：
10.1016/j.micromeso.2005.07.011
复制
发表时间：
2005-11
影响因子：
5.2
通讯作者：
Atsushi Itadani;Y. Kuroda;Masashi Tanaka;M. Nagao
中科院分区：
文献类型：
--
作者：
Atsushi Itadani;Y. Kuroda;Masashi Tanaka;M. Nagao
通过结合量热法和光谱学方法，以CO为探针分子，我们获得了支持NO在CuZSM-5沸石中两种一价铜离子(Cu+)物质上发生分解反应的证据。这些 Cu+ 物质在 21,000 和 18,500cm−1 处显示出特征发射带，并且分别给出了 122 和 110kJmol−1 的 CO 吸附热。考虑到我们之前的EXAFS数据，发现前者采用包含晶格氧原子的二配位结构，而后者则采用三配位结构。在本文中，我们还强调了我们最初指定的 CuZSM-5 室温下 N2 吸附活性位点的有效性；三配位的 Cu+ 物质吸附 N2 分子。
By combining the methods of calorimetry and spectroscopy using CO as a probe molecule, we obtained the evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion (Cu+) species in CuZSM-5 zeolite. These Cu+species showed the characteristic emission bands at 21,000 and 18,500cm−1and, respectively, gave the CO adsorption heats of 122 and 110kJmol−1. Taking account of our previous EXAFS data, it was found that the former species take the two-coordinated structure involving lattice oxygen atoms, while the latter ones the three-coordinated structure. In this paper, we also emphasized the validity of our original assignment of active sites on CuZSM-5 for N2adsorption at room temperature; three-coordinated Cu+species adsorb N2molecules.