高温度条件下臭氧分解催化剂（锰、银）的制备及性能研究

【作者】 印红玲；

【导师】 冯易君；

【作者基本信息】 四川大学 ， 环境科学， 2003， 硕士

【摘要】 近年来，臭氧化技术在各领域的应用日趋广泛，但排放到环境中的尾气仍然含有一定量的臭氧。臭氧作为剧毒性气体，低浓度的臭氧即对人类及生存环境构成直接威胁。因而处理高湿度的含臭氧的尾气已成为必要。催化法是一种有效的分解臭氧的方法。本论文用几种方法制备了含锰和银的臭氧分解催化剂，并考察了它们在高湿度条件下（相对湿度95％）对高浓度臭氧（浓度＞20mg／m³）的催化分解活性。用分步浸渍法制备的MnOx—AgOx/堇青石催化剂活性最高，在臭氧浓度25mg／m³,相对湿度＞95％时，500h内的分解率保持在～100％。XRD表明活性组份在载体表面分散性良好，XPS分析表明MnOx与AgOx发生了相互作用，协同催化分解高湿度下的臭氧。该催化剂具有制法简便、稳定高效、经济耐用的优点，是较理想的臭氧分解催化剂。本文对臭氧在催化剂表面的分解机理进行了初步讨论和研究，认为高湿度条件下，MnOx—AgOx／堇青石催化剂表面上发生的是多相催化反应。水作为一种反应物，参与了催化分解反应，生成的活性物种．OH和．O₂H在催化剂表面局部的多相区域里自由活动，使链催化反应顺利平稳地进行下去。更多还原

【Abstract】 Ozonation technology has been more and more widely used in most industry fields. Although the discharge gas has been treated, it has some ozone that threatened human and the nature. So it’s necessary and urgent to treat these high humidity ozone in the discharge gas. Catalytic decomposition is the most favorable method.In this paper, we’ve prepared manganese and silver oxide catalysts in some way and studied their catalytic performance for decomposition of high concentration ozone under high humidity condition. Cordierite-supported manganese and silver oxide catalyst had the highest catalytic activity. When the relative humidity is up to 95%, ozone concentration is 25 mg/m3, the ozone is almost totally decomposed during 500h. XRD indicated that MnOx and AgOx were highly dispersed on the support. XPS analyst showed that MnOx and AgOx interact and cooperate in catalytically decompose ozone.We also discussed the mechanism of ozone decomposition under high humidity condition. We suggested the multi-phases catalytic procedure on the manganese and silver oxide catalysts. H2O act as a reactant, take part in the catalytic process, the active materials .OH and .O2H can move freely in the multi-phased which made the catalytic sequence proceed successfully.更多还原