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Different Al/Ni ratios of pillared montmorillonite [Al/Ni (20, 15, 10, 6, 4, 2)-PILCs] were prepared by introducing the Al/Ni cationic polymers into montmorillonite under certain conditions. The structural properties of Al/Ni-PILCs were determined by a combination of X-ray diffraction (XRD), $$\hbox {N}_{2 }$$ N 2 adsorption–desorption, $$\hbox {NH}_{3}$$ NH 3 temperature programmed...