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Polymorphous transformation of rod-shaped γ-Fe 2 O 3 was applied to fabricate Fe 3 O 4 /Fe 2 O 3 nanorods and their activities in NH 3 -SCR followed the order γ-Fe 2 O 3 > α-Fe 2 O 3 > Fe 3 O 4 .
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Wei et al. (2015) studied this question.
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