论文部分内容阅读
应用XPS,UPS,LEED和TDS考察了酚在Pd(110)上的吸附和分解.所得到的酸在Pd(110)上分解过程为:在300K,酚中O-H键首先断开形成化学吸附的酚氧基并放出H2;进一步加热引起酚氧基中C-C键的断裂而生成化学吸附的烃碎片和CO.后者在44K开始脱附;烃碎片中的C-H键在450K断裂并同时放出H2。降低酚的表面复盖度并不改变酚的分解动力学.但提高了CO和H2的脱附温度.在酚的分解过程中.C-O键永不断裂.UPS谱指出,酚在Pd(110)上的吸附促使了酚氧基中苯环的π键和氧孤对电子的稳定化,表明了表面相互作用是通过苯环及氧原子的表面化学键合实现的.
Adsorption and decomposition of phenol on Pd (110) were investigated using XPS, UPS, LEED and TDS. The resulting acid decomposes on Pd (110) as follows: At 300 K, the O-H bond in the phenol breaks first to form a chemically adsorbed phenoxy group and releases H2; further heating causes the cleavage of the C-C bond in the phenoxy group While generating chemisorbed hydrocarbon fragments and CO. The latter begins to desorb at 44K; the C-H bond in the hydrocarbon fragment breaks at 450K and at the same time releases H2. Decreasing phenol surface coverage does not change the kinetic of phenol decomposition. But increased the desorption temperature of CO and H2. Phenol in the decomposition process. C-O keys never break. The spectrum of the UPS indicates that the adsorption of phenol on Pd (110) promotes the stabilization of π bond and oxygen lone pair of benzene ring in phenoxy group, indicating that the surface interaction is achieved through the chemical bonding of benzene ring and oxygen atom of.