成型条件对Co/Beta催化剂性能的影响

Influence of molding conditions one performance of Co/Beta catalyst

研究成型条件对催化剂性能的影响在工业应用中具有重要意义。以Co/Beta条型催化剂为研究对象,考察粘合剂用量、胶溶剂浓度、助挤剂含量对成型催化剂性能的影响,在气固相催化反应评价装置中研究成型催化剂催化分解N_(2)O的活性,通过机械强度测定、X射线衍射(XRD)、BET比表面积测定、氢气程序升温还原(H_(2)-TPR)、氨气程序升温脱附(NH_(3)-TPD)等方法对催化剂进行表征。结果表明,最佳成型条件为粘合剂拟薄水铝石(SB粉)用量为质量分数30%,胶溶剂硝酸浓度6%,助挤剂田菁粉用量为质量分数4%。最佳条件成型的催化剂径向抗压碎力110.3 N·cm^(-1),N_(2)O完全转化温度460℃。

It is of great significance to study the effect of molding conditions on the performance of shaped catalysts in practical industrial applications.Taking Co/Beta forming catalyst as the research object,the influence of different binder mass ratio,peptizer concentration and extrusion aid content on the performance of forming catalyst was analyzed.The activity of shaped catalysts in catalytic decomposition of N_(2)O was studied in a gas-solid phase catalytic reaction evaluation device.The catalysts were characterized by intensity measurement,X-ray diffraction(XRD),BET specific surface area measurement,hydrogen temp-erature-programmed reduction(H_(2)-TPR),and ammonia temperature-programmed desorption(NH_(3)-TPD).The experimental results show that the best forming condition were mass fraction of SB powder_(3)0%,concentration of nitric acid 6%and mass fraction of safflower powder 4%.Under the determined optimum forming conditions,the radial compressive crushing force of catalyst was 110.3 N·cm^(-1),T_(99)of N_(2)O conversion was 460℃。