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[求助] 透射电镜观察分子筛负载钯催化剂表面是否有钯黑

请教高手,我合成的分子筛负载钯催化剂在反应后需要证实在分子筛表面或者结构中生成了钯黑。请教高手:
    (1)可以用TEM观察得到钯黑生成吗?
    (2)如果有钯黑得到,怎么分辨是在表面还是分子筛结构中呢?
    (3)测试的时候,有什么注意的地方。
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