【摘要】 用IR,PAS,XRD和DTA,TGA及XPS,SEM对Na-Y型分子筛担载的过渡金属氧化物催化剂的表面结构和特征进行了研究.结果表明,单元RuO₂/Y催化剂的活性相分布均匀,价态单一,Ru:O≤2,RuO₂微晶粒线度为30—40（?）,催化剂表面上存在L酸和B酸中心。对于分浸或共浸Ru-Fe复合催化剂,它们的表面结构、金属价态、微晶粒线度均有所不同,并存在着不同的金属与金属或担体间的强相互作用（或化学作用）,因而它们的催化活性差异也大。同晶型的RuO₂,IrO₂及其复合的催化剂的结构性能变化不大,都具有较高的催化活性。更多还原

【Abstract】 It has been previously reported that RuO2/Y mixed with MeOx/Y, e. g. RuO2/Y+FeOX/Y, RuO2/Y+IrOx/Y, etc, gives higher catalytic activity than RuO2/Y itself in the photooxidation process of water to dioxygen. In this paper, the surface structure and properties of zeolite-supported transition metal oxide catalysts are studied by IR, PAS, XRD, DTA, TGA.XPS and SEM.IR spectra show that (RuO2/Y+FeOx/Y) contains much more acid sites (Bronsted acid and Lewis acid) than the corresponding co-impregnated catalyst (RuO2-FeOx)/Y. The composition and properties of (RuO2/Y + FeOx/Y) and (RuO2-FeOx)/Y are quite different as shown by both their photoacoustic spectra and X-ray photoelectron spectra. On these two catalysts, the strong metal-support interaction has taken place. Such inference is supported by the results of SEM observation and DTA, TGA analyses. SEM observations demonstrate that the morphological structures of (RuO2/Y + FeOx/Y) and (RuO2-FeOx)/Y are also different. The above mentioned results have, been studied in regard to the diameter of RuO2, RuO2+FeO, and (RuO2-FeOx) particles, the dispersibility of active metal oxides, and valence state. The diameter of RuO2 on the surface of RuO2/Y catalyst determined is 30-40A andd Ru:O≤2.更多还原