氧化物－NaZSM－5催化剂的研究　Ⅰ．ZnO－NaZSM－5催化剂的表征

STUDIES ON OXIDE-NaZSM-5 CATALYSTS I. CHARACTERIZATION OF ZnO-NaZSM-5

氧化物－ＮａＺＳＭ－５催化剂的研究 Ⅰ．ＺｎＯ－ＮａＺＳＭ－５催化剂的表征杨民，徐柏庆，梁娟，盛世善（中国科学院大连化学物理研究所，大连１１６０２３；大连理工大学化工学院化学系，大连１１６０１２）关键词ＺＳＭ－５沸石，氧化锌，分散，强相互作用，表征在...

ZnO-NaZSM-5 catalysts with different ZnO loadings (0～17%)have been prepared by impregnation method. Physico-chemical properties of the catalysts are characterized by XRD, IR, XPS, MAS NMRand TPD techniques. At low Zno loadings up to 8. 3%, ZnO exists inhighly dispersed state which is non-detectable by XRD. At higher ZnOloadings, crystalline Zno particle can be observed. The highly dispersedZnO, existing in a form of oxide cluster, can exist either on the externalsurface or in the pore system of the zeolite, but crystalline ZnO existsonly on the external surface. 23Na MAS NMR result suggests that Na+in the zeolite participates in the formation of the cluster, while theframework vibration spectra show a strong interaction between theframework oxygen and the cluster.