为探讨ZSM-5分子筛载体形貌结构对催化剂催化效果的影响,通过调控制备得到了片状ZSM-5(S-ZSM-5)和颗粒状ZSM-5(N-ZSM-5),对其进行吸附性能评价;以饱和吸附量最大的改性分子筛S-0.1为载体,采用浸渍法制备了系列低负载量的CoMn/S-0.1催化剂,探讨了其理化特性、催化动力学特征及其对甲苯的催化氧化性能。结果表明:系列CoMn/S-0.1催化剂中以S-Co∶Mn(1∶1)对甲苯的催化氧化效率最高,甲苯催化氧化率达到50%所对应的温度(T50)和达到90%时所对应的温度(T90)分别为284℃和289℃。S-Co∶Mn(1∶1)具有微孔表面积大、微孔孔容大的特点,且具有较高比例的高价态Co3+和低价态Mn3+,有利于甲苯的低温催化氧化。
In order to investigate the influence of the morphology and structure of ZSM-5 molecular sieve support on the catalytic effect of the catalyst,sheet-like ZSM-5 (S-ZSM-5) and granular ZSM-5 (N-ZSM-5) were prepared by regulating and controlling the preparation,and their adsorption performance was evaluated.The modified zeolite S-0.1 with the largest saturated adsorption capacity was used as the carrier,and a series of low-loading CoMn/S-0.1 catalysts were prepared by impregnation method.Their physical and chemical properties,catalytic kinetic characteristics and catalytic oxidation performance were discussed.The results showed that among the series of CoMn/S-0.1 catalysts,S-Co∶Mn (1∶1) had the highest catalytic oxidation efficiency for toluene.The temperatures corresponding to 50% toluene conversion (T50) and 90% conversion (T90) were 284℃ and 289℃,respectively.The S-Co∶Mn (1∶1) catalysts had larger micropore surface area and micropore capacity,along with a high proportion of high-valence Co3+ and low-valence Mn3+,which were conducive to the catalytic oxidation of toluene at low temperature.
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