Abstract: Pmodified HZSM5 catalysts were prepared by impregnation and used in the reaction of methanol to propylene as the catalyst. The effect of different phosphorous precursor amount on their catalyst characterization and catalytic performance is investigated. The results show that the amount of strong acid sites of phosphorus modified catalysts decreased, while that of weak acid sites increased. The increase of P loading with the range of 0% and 0.5% leads to the decrease of specific surface area and micropore volume, the increase of average pore size as well. However, there is no change in the framework and crystallinity. Compared with HZSM5, the stability of P/HZSM5 catalyst has been significantly improved, and the selectivity to propylene was significantly increased. And when the mass fraction of P is 0.25%, Propylene selectivity could be up to 54.6%.

Key words: Phosphorus ,  HZSM5 modification , Methanol to propylene ,  Catalysis , Specific surface area

摘要： 暋通过等体积浸渍法制备P改性HZSM灢5催化剂,考察了不同程度的P改性对HZSM灢5催化剂表征及
催化性能的影响。实验结果表明,P改性后的催化剂的强酸位明显减弱,弱酸位有所增强。在P质量分数为0%~
0.500%的范围内进行改性时,随着P质量分数的增加,P灢HZSM灢5催化剂的比表面积、微孔体积逐渐变小,平均孔径
增大。但催化剂骨架结构保持不变,结晶度几乎不发生改变。相对于P改性之前,催化剂的稳定性有了显著的提
高,丙烯的选择性明显增加。且当P的质量分数为0.250%时,丙烯选择性最高可达54.6%。

关键词: 磷 , HZSM-5改性 , 甲醇制丙烯 , 催化 , 比表面积