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MoO_3与不同制备方法和来源的γ-Al_2O_3(包括η-Al_2O_3)干混、焙烧制备的样品,或者用浸渍、焙烧制备的样品,通过X光衍射测得的MoO_3最大分散量都与按密置单层模型计算得到的结果(每100米~2γ-Al_2O_3表面0.117克MoO_3,即4.9×10~(18)Mo原子/米~2)相近。这样可以通过X光衍射测定MoO_3在每克γ-Al_2O_3上的最大分散量而得到γ-Al_2O_3的比表面。比表面和孔容的研究结果也支持MoO_3在γ-Al_2O_3表面呈密置单层分散的模型。
MoO_3 with different preparation methods and sources of γ-Al_2O_3 (including η-Al_2O_3) dry-mixed, calcined samples, or samples prepared by impregnation and calcination, the maximum dispersion of MoO_3 measured by X-ray diffraction, The results calculated by the single-layer model (0.117 g MoO_3 per 100 m ~ 2γ-Al_2O_3 surface, ie, 4.9 × 10 ~ (18) Mo atoms / m ~ 2) are similar. In this way, the specific surface area of γ-Al 2 O 3 can be obtained by measuring the maximum amount of MoO 3 dispersed per gram of γ-Al 2 O 3 by X-ray diffraction. The results of specific surface area and pore volume support the model that MoO_3 is densely packed monolayer on γ-Al_2O_3 surface.