成型方法对MTP工艺ZSM-5分子筛催化剂性能的影响

Effect of shape-forming method on performance of ZSM-5 molecular sieve catalyst for MTP

以高硅铝比HZSM-5为活性组分,用SiO2、γ-Al2O3为粘结剂通过挤条成型后制成催化剂,在典型的MTP条件下,对催化剂进行活性评价。用XRD,NH3-TPD,Py-IR等手段对催化剂进行表征,分析催化活性、强度与粘结剂的关系,发现采用不同粘结剂成型的催化剂会影响其表面的酸性质及其分布,对催化剂的强度影响也很显著,SiO2粘结剂比.γ-Al2O3低碳烯烃选择性高、稳定性好。

Using HZSM-5 molecular sieve with high Si/Al ratio as active component and SiO2 orγ-Al2O3 as binder to prepare the catalysts for methanol to propylene （MTP） by extrusion. The catalytic performances of the prepared catalysts were evaluated under the common conditions for MTP reaction, and XRD, NH3-TPD, Py-IR etc. were used to characterize the catalysts to investigate the effect of different binders on the catalytic activity and mechanical strength of the catalysts. The results showed that the binders had obvious effect on the strength and surface acid behaviour of the catalysts as well as the distribution of MTP products, and SiO2 demonstrated a better selectivity to light alkenes and a higher stability than γ-Al2O3.