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采用实验室EXAFS方法探测了Ni~(2+)交换进入Y分子筛以及进而还原过程中配位结构的变化。新鲜样品中Ni~(2+)以Ni~(2+)(H_2O)_6的形式存在于超笼中,Ni—o键长2.09。773K脱水后Ni—o键长增至2.11,配位
The EXAFS method was used to detect the change of coordination structure of Ni ~ (2+) exchanged into Y zeolite and then reduced. In fresh samples, Ni ~ (2+) is present in the supercage in the form of Ni ~ (2 +) (H_2O) _6, Ni-o bond length increases to 2.11 after Ni-o bond length 2.09.773K dehydration,