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The results showed that the kind of rare earth metals, the baking temperature£¬ the baking time and the content of the rare earth have effect on the catalytic activity variously; when  the ratio between the rare earth and A was 5:1, B was baked at 400 ¡æ, while C and D at 550 ¡æ  for 1 hour the activity of the catalyst reach its best.
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The results showed that the kind of rare earth metals, the baking temperature£¬ the baking time and the content of the rare earth have effect on the catalytic activity variously; when  the ratio between the rare earth and A was 5:1, and B was baked at 400 ¡æ, while C and D at 550 ¡æ  for 1 hour£¬ the activity of the catalyst reached its best.
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