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首页> 外文期刊>Catalysis Letters >Prevention of Catalyst Deactivation in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene over Zn-Ferrite Catalysts
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Prevention of Catalyst Deactivation in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene over Zn-Ferrite Catalysts

机译：锌铁氧体催化剂上正丁烯氧化脱氢制1,3-丁二烯时催化剂失活的预防

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摘要

An efficient method to enhance the catalytic properties of Zn-ferrite catalyst in the oxidative dehydrogenation of n-butene to 1,3-butadiene is proposed. The incorporation of phosphorous compound in Zn-ferrite is very effective to improve the catalytic activity as well as to maintain extremely long useful lives at high oxygen to n-butene ratio. It is found that the amount of phosphorous is critical and the presence of appropriate amount of phosphorous in catalyst may contribute the catalyst stabilization by which unfavorable reduction of Fe~(3+) sites to Fe~(2+) is effectively suppressed. This suggests that the oxygen mobility is maintained as high as the redox mechanism keeps constantly working. On the other hand, the effort to increase the population of mobile oxygen species by the introduction of external oxygen donor phase is found to be rather ineffective regardless of the external donor oxides used.
机译：提出了一种提高锌铁氧体催化剂在正丁烯氧化脱氢为1,3-丁二烯中的催化性能的有效方法。在锌铁氧体中掺入磷化合物对于提高催化活性以及在高氧对正丁烯比率下保持极长的使用寿命非常有效。发现磷的量是关键的，并且催化剂中适当量的磷的存在可有助于催化剂的稳定化，由此有效地抑制了Fe〜（3+）位向Fe〜（2+）的不利还原。这表明，氧的迁移率保持与氧化还原机理一样高。另一方面，发现无论引入何种外部给体氧化物，通过引入外部给体氧来增加可移动氧物种的数量的努力都是无效的。

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