整体式Fe-β分子筛成型方法及其催化N_2O分解反应性能

为了降低催化剂床层压降,提高Fe-β分子筛催化剂用于N_2O催化分解的能力,通过研究整体式分子筛催化剂制备方法,优化出最优原料配比为ω(拟薄水铝石)=40%,ω(硝酸)=8%,水粉比为0.6 m L·g~(-1)。研究了成型过程对分子筛催化剂结构及性能的影响,并在不同孔密度分子筛催化剂、N_2O浓度和空速条件下考察N_2O分解反应性能。结果表明,在相同温度、空速和N_2O浓度下,分子筛催化剂的孔密度越高,催化活性呈增强趋势;对于相同孔密度的分子筛催化剂,随着空速的增加,相同温度下的N_2O转化率逐渐下降;对于相同孔密度的分子筛催化剂,在相同反应空速和温度下,随着N_2O浓度的增大,N_2O转化率呈上升趋势。

Molding method of honeycomb shaped monolithic Fe-β zeolite catalyst andits catalytic performance for N2O decomposition

In order to reduce the bed pressure drop and improve the activity of Fe-β zeolites for catalytic decomposition of N₂O,the preparation methods of honeycomb shaped monolithic Fe-β zeolite catalyst were studied.The optimal condition was obtained as follows: ω（pseudo-boehmite powder)=40%,ω（nitric acid）=8%,and water/Fe-β zeolite=0.6 mL·g^-1.The influence of molding processes on the structure and performance of Fe-β zeolite catalyst was investigated.The results showed that under the condition of the same temperature,airspeed and N₂O concentration,the higher channels per square inch(CPSI) on catalyst led to higher catalytic activity.At the same reaction temperature,N₂O conversion rate over the catalyst with the same CPSI gradually decreased with the increase of airspeed.Under the condition of the same airspeed and reaction temperature,N₂O conversion rate over the catalyst with the same CPSI enhanced with the increase of N₂O concentration.