【摘要】 采用水热合成法制备了不同硅锆比的中孔分子筛Zr-MCM-41,用强酸性基团SO42-对其进行修饰,制得SO42-/Zr-MCM-41中孔分子筛.采用XRD、FT-IR、NH3-TPD及氮气吸附脱附等技术对其结构和酸强度进行表征.通过改变硅锆比、负载不同的酸性基团对Zr-MCM-41的酸性进行调变,并将其用于催化聚丙烯(PP)的裂解反应,结果表明S i/Zr=40的SO42-/Zr-MCM-41具有较好的催化裂解活性.另外,与热裂解以及HZSM-5和Zr-MCM-41为催化剂时PP的裂解反应结果进行了比较,结果证明SO42-/Zr-MCM-41不仅具有较高的裂解转化率,而且具有较高的液体产物收率,适宜于空间位阻较大的PP的催化裂解反应.更多还原

【Abstract】 Mesoporous Zr-MCM-41 materials of different Si/Zr ratios were synthesized under hydrothermal conditions.Zr-MCM-41 material was impregnated in sulfuric acid to prepare SO42-/Zr-MCM-41.The obtained materials were characterized by XRD,FT-IR,N2 adsorption/desorption and NH3-TPD techniques.The acidity of Zr-MCM-41 was adjusted by changing the molar ratio of Si to Zr and supporting other acidic groups.The results showed that SO42-/ Zr-MCM-41 of Si/Zr=40 showed better catalytic activity when used as catalyst in the pyrolysis of polypropene(PP).Compared with the results obtained by thermal pyrolysis and by catalytic pyrolysis over HZSM-5 or Zr-MCM41,higher pyrolysis conversion of PP and higher yield of liquid products were obtained using SO42-/ Zr-MCM-41 as catalyst.It was showed that SO42-/ Zr-MCM-41 was especially suitable for the pyrolysis of sterically hindered polymers such as PP.更多还原