钒磷复合氧化物催化剂再氧化的在线动态质谱研究

 采用在线质谱动态响应技术，研究了钒磷复合氧化物（VPO）催化剂再氧化条件（氧浓度、温度和时间）对正丁烷选择氧化制顺酐反应的影响．结果表明，催化剂再氧化条件对正丁烷选择氧化反应性能有明显的影响，其中再氧化温度是主要影响因素．当正丁烷选择氧化和VPO催化剂再氧化在反应器（循环流化床和固定床）内序贯、交替进行时，可以通过改变再氧化条件使催化剂再氧化反应与正丁烷选择氧化反应恰当地匹配以改善时均反应性能．

On-Line Mass Spectroscopic Transient Measurement of Vanadium-Phosphorous Oxide Re-oxidation

Effects of re-oxidation conditions of vanadium-phosphorous oxide ((VO) 2P 2 O 7, abbreviated to VPO) catalyst on n-butane selective oxidation by latti ce oxygen were experimentally studied using on-line mass spectroscopic transien t measurement in fixed-bed micro-reactor. The oxygen concentration, re-oxidat ion temperature and re-oxidation time were involved in this work. The results show that the re-oxidation conditions of VPO catalyst are very important to the selective insertion of lattice oxygen, of which the effect of re-oxidation temperature is the most obvious. By raising the re-oxidation temperature of th e catalyst to match the selective oxidation of n-butane with the re-oxidat ion of the catalyst under suitable reaction conditions can remarkably improve th e reaction performance of n-butane oxidation in a circulating fluidized bed two-bed system or a fixed-bed, in whi ch the n-butane selective oxidation and VPO catalyst re-oxidation are perf ormed separately.