【摘要】 用热脱附谱等方法研究了NO分别在清洁和Cs覆盖的Ru(1010)表面上的吸附.结果表明:存在两种NO分子吸附态(a1,a2),脱附温度分别处于325℃和550℃附近.Cs的存在增加了Ru(1010)表面上a2态的吸附位置,提高了该态的脱附温度.Cs在Ru(1010)表面上的存在同时促进了吸附NO分子的分解.NO在Ru(1010)表面上分解后形成吸附O原子和N原子.N原子复合以N2在约500℃附近脱附,同时Cs的存在也促进了N2O的形成.在Cs覆盖的Ru(1010)表面上,N2O的脱附温度约在425℃.更多还原

【Abstract】 The adsorption of NO on the clean and Cs\|precovered Ru(1010) surfaces has been studied by means of thermal desorption spectroscopy (TDS).For NO adsorption on the clean surface, two adsorption states ( a 1,a 2) for the desorption temperatures at 325?℃ and 550?℃ were observed. In the case of NO adsorption on the Cs\|precovered Ru(1010) surface, the existence of Cs resulted in more adsorption sites for a\-2 states, and the desorption temperature of this state was also increased. Furthermore, the desorption species such as N\-2 and N\-2O were observed. This implies that part of NO molecules dissociate into N and O adatoms on the surface, and those adsorbed species recombine into N\-2 and N\-2O.This result gives evidence for the promoting effect of alkali\|metals.更多还原