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本文报道利用X光衍射、红外衰减全反射、电子顺磁共振、电导率、比表面、差热分析和催化色谱等手段,对比了新鲜的、使用过程其活性下降了的、和水蒸汽处理过的磷铝铋/SiO_2三组份丁烯氧化脱氢催化剂的结构和性能关系,发现在失活原因中主要是催化剂的晶相改变了,由β相变为γ相之故。数据指出,在水蒸汽处理下钼流失一定量后,初活性不但不下降,相反的反而升高几个单位,说明了在一定范围内,钼流失不是催化剂失活原因。
This paper reports the use of X-ray diffraction, total reflection infrared attenuation, electron paramagnetic resonance, conductivity, specific surface area, differential thermal analysis and catalytic chromatography and other means, compared with the fresh, the use of its activity decreased, and steam treated The relationship between the structure and the performance of the three components of phosphorus-phosphorus bismuth / SiO 2 oxydehydrogenation catalysts was found. The main reason for the deactivation was that the crystalline phase of the catalyst changed from β phase to γ phase. The data indicates that the initial activity not only does not decrease but also increases by several units after the loss of molybdenum under steam treatment, indicating that the loss of molybdenum is not the cause of catalyst deactivation within a certain range.