论文部分内容阅读
应用X光衍射法(XRD)测定了WO_3/γ-Al_2O_3体系的物相组成和平均晶粒度,以及该体系的孔容和比表面;应用XRD相定量外推法和光电子能谱(XPS)峰强度比(I_(W4f)/I_(Al2s)法定量测定了WO_3在γ-Al_2O_3表面的最大分散量,测值分别为0.21和0.20gWO_3/100m~2γ-Al_2O_3,与按照WO_3在γ-Al_2O_3表面作密置单层排布模型的计算值(0.189gWO_3/100m~2,即4.9×10~(18)W原子/m~2)相近。对WO_3/γ-Al_2O_3体系与MoO_3/γ-Al_2O_3体系作了比较和讨论。
The phase composition and average grain size of WO_3 / γ-Al_2O_3 system and the pore volume and specific surface area of the system were determined by X-ray diffraction (XRD) The maximum dispersion of WO_3 on γ-Al_2O_3 surface was measured by I_ (W4f) / I_ (Al2s) method and the measured values were 0.21 and 0.20gWO_3 / 100m ~ 2γ-Al_2O_3, The calculated values for the surface monolayer model (0.189gWO_3 / 100m ~ 2, 4.9 × 10 ~ (18) W atoms / m ~ 2) System made a comparison and discussion.