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Nickel nanoparticulate catalysts supported on hollow Al 2 O 3 ball (<3μm in diameter) have been prepared by spraying a mixed solution of nickel and aluminum nitrates in atmospheric pressure plasma. A wall of each ball (ca. several 10nm in thickness) consisted of uniformly dispersed oxide bricks of ca. 30nm sizes, which were identified as densely packed NiO, NiAl 2 O ...
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