工业芳构化催化剂中γ－Al_2O_3对分子筛酸性的影响

Effect of γ-Al_2O_3 on the Acidity or Industrial Aromation Catalyst

用重量吸附法测得ＨＺＳＭ－５分子筛原粉、γ－Ａｌ２Ｏ３和工业用芳构化催化剂ＨＺＳＭ－５的酸量和强度。实验发现ＨＺＳＭ－５原粉和工业催化剂的酸量很接近，而Ａｌ２Ｏ３的酸量要比原粉低得多，强酸只占原粉的１０％左右。用红外吸附法测得原粉的Ｂ酸／Ｌ酸相对含量为催化剂的４倍左右，实验表明，Ａｌ２Ｏ３对分子筛的酸性有较大影响，主要增加了Ｌ酸。

The acidity of HZSM-5 zeolite powder, γ-Al2O3 and industrial catalyst was measured by Static Volumetric method. It was found that the acid amounts of HZSM-5 zeolite and the catalyst are nearly equal, and the and amount of γ-Al2O3 is only as much as 10% that of zeolite powder. B acid/L acid ratio of HZSM-5 zeolite is 4 times as many as that of the catalyst. The experiments proved that γ-Al2O3 has an important effect on the acidity of the catalyst, mainly increasing the amount of L acid.