Synthesis, characterization and isomerization performance of micro/mesoporous materials based on H-ZSM-22 zeolite
作者:Suyao Liu、Jie Ren、Huaike Zhang、Enjing Lv、Yong Yang、Yong-Wang Li
DOI:10.1016/j.jcat.2015.12.009
日期:2016.3
in alkaline solution with cetyltrimethylammonium bromide template (CTAB). The structure, morphology, pore properties, acidity and isomerization performance of the catalysts by using the resulting materials were characterized and assessed. The dissolution and recrystallization procedure introduced the well-developed mesoporous structure of MCM-41 type with the meso-scale channels of about 3 nm in size
通过用十六烷基三甲基溴化铵模板(CTAB)在碱性溶液中重结晶H-ZSM-22沸石,制备具有不同介孔率的微/介孔材料。通过使用所得材料对催化剂的结构,形态,孔性能,酸度和异构化性能进行了表征和评估。溶解和重结晶过程引入了发达的MCM-41型介孔结构,该介孔结构在H-ZSM-22微孔沸石的外表面上形成了尺寸约为3 nm的介孔通道,形成了微孔/介孔材料,其在孔口具有增加的弱B酸位点和减少的总酸位点数量。结果表明,发达的中孔的存在可以显着提高对多支链产物的选择性,并抑制正十二烷异构化过程中的侧裂反应。与原始的微孔Pt / H-ZSM-22催化剂相比,具有合适重结晶度的微孔/中孔Pt / ZSM-22 / MCM-41双功能催化剂在长链正构烷烃异构化过程中,在高转化率下具有高异构化选择性。