【摘要】 用硅油对HZSM 5沸石进行化学液相沉积改性。IR和氮吸附实验结果表明 ,液相沉积硅化物改性不影响沸石的骨架构型和微孔结构 ,焙烧后形成的SiO2 仅存在于沸石外表面。间二甲苯异构化和 1,3,5 三异丙苯裂解反应实验结果表明 ,SiO2 沉积钝化了沸石外表面的B酸位并调变了沸石开口孔径。对改性机理进行了初步探讨并确定了改性后分子筛外表面的沉积状态。更多还原

【Abstract】 HZSM-5 zeolite was modified by silicone oil through chemical liquid deposition(CLD). The modified zeolite were characterized and examined by IR, nitrogen adsorption, and in the reactions of metaxylene isomerization and 1,3,5-triisopropylbenzene(1,3,5-TIPB) cracking. The results showed that the framework and micropore structure of HZSM-5 zeolite remained unchanged and the sizes of open pore in zeolite were reduced and the Brnsted acidity values on external surface were inactivated. The mechanism of silica modification has been briefly discussed.更多还原