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用Ni、Ce、Cu、Cr的硝酸盐、醋酸盐(Cu为丙酸盐)溶液分别浸渍γ-Al_2O_3,经蒸发烘干、焙烧分解制得各种金属氧化物-γ-Al_2O_3体系。利用x射线相定量参比法,测得各体系中氧化物在γ-Al_2O_3上的最大单层分散容量(简称分散阈值)。不同的氧化物有不同的分散阈值。对于制得的同一种氧化物也会因所用原料盐的不同而具有不同的分散阈值。这为制备载负型体系选用原料盐时,提供了有益的参考。
Γ-Al_2O_3 was impregnated with Ni, Ce, Cu and Cr nitrate and acetate (Cu) propionate respectively, and then evaporated to dry and calcined to prepare various metal oxide-γ-Al 2 O 3 systems. Using X-ray phase quantitative reference method, the maximum monolayer dispersion capacity (referred to as dispersion threshold) of oxides on γ-Al 2 O 3 in each system was measured. Different oxides have different dispersion thresholds. For the same kind of oxide obtained, it also has different dispersion thresholds depending on the raw material salt used. This provides a useful reference when preparing raw materials for preparing negative system.