采用水热合成法制备了I M-5和TNU-9分子筛,并采用水蒸气处理法对其进行了改性。采用XRD、BET、TEM、吡啶-IR、29Si、27Al MAS NMR等手段对分子筛的物化性能进行了表征,并考察了分子筛在甲苯甲醇烷基化反应中的催化性能。结果表明,与ZSM-...采用水热合成法制备了I M-5和TNU-9分子筛,并采用水蒸气处理法对其进行了改性。采用XRD、BET、TEM、吡啶-IR、29Si、27Al MAS NMR等手段对分子筛的物化性能进行了表征,并考察了分子筛在甲苯甲醇烷基化反应中的催化性能。结果表明,与ZSM-5分子筛相比,I M-5和TNU-9分子筛在甲苯甲醇烷基化反应中具有较高的催化活性,二甲苯选择性高。经水蒸气处理后,ST-H-I M-5和ST-H-TNU-9分子筛的活性有所下降,ST-H-I M-5分子筛的二甲苯选择性高,ST-H-TNU-9分子筛的对二甲苯选择性达到40%左右。展开更多
系统地考察了晶种、n(NaOH)/n(SiO2)、n(MPPBr2)/n(SiO2)和n(H2O)/n(SiO2)对合成IM-5分子筛的影响,并采用27 Al MAS NMR、29Si MAS NMR和TEM表征手段探讨了IM-5分子筛的晶化机理。结果表明,添加晶种和降低体系的n(H2O)/n(SiO2)能有效缩...系统地考察了晶种、n(NaOH)/n(SiO2)、n(MPPBr2)/n(SiO2)和n(H2O)/n(SiO2)对合成IM-5分子筛的影响,并采用27 Al MAS NMR、29Si MAS NMR和TEM表征手段探讨了IM-5分子筛的晶化机理。结果表明,添加晶种和降低体系的n(H2O)/n(SiO2)能有效缩短晶化时间;n(NaOH)/n(SiO2)和n(MPPBr2)/n(SiO2)是影响IM-5分子筛合成过程中杂晶相生成的重要因素,适当调节可有效抑制方沸石(ANA)、丝光沸石(MOR)杂晶的生成;通过优化合成条件,晶化时间可由14d缩短至6d,得到高结晶度的纯相IM-5分子筛。展开更多
IM-5 zeolite was synthesized by hydrothermal crystallization method with 1,5-bis(N-methylpyrrolidinium)pentane bromide using the precursors N-methylpyrrolidine and 1,5-dibromopentane as raw materials of template after...IM-5 zeolite was synthesized by hydrothermal crystallization method with 1,5-bis(N-methylpyrrolidinium)pentane bromide using the precursors N-methylpyrrolidine and 1,5-dibromopentane as raw materials of template after pre-reaction,and then aluminum,alkali,water and silicon sources were added into the reaction system.The effects of the proportion of precursors and other materials and the reaction conditions on the crystallinity,crystal morphology and pore structure of the synthesized zeolites were systematically investigated,which provided the basic data for industrial production.The physical properties of the synthesized samples were analyzed by XRD,SEM,and N2 adsorptiondesorption techniques,and the catalytic performance of the samples was evaluated.The results show that IM-5 zeolite can be synthesized effectively by using the template pre-reaction method,and its physical properties and catalytic activity in catalytic alkylation of benzene and methanol are comparable to those of industrial samples synthesized by traditional method.展开更多
文摘系统地考察了晶种、n(NaOH)/n(SiO2)、n(MPPBr2)/n(SiO2)和n(H2O)/n(SiO2)对合成IM-5分子筛的影响,并采用27 Al MAS NMR、29Si MAS NMR和TEM表征手段探讨了IM-5分子筛的晶化机理。结果表明,添加晶种和降低体系的n(H2O)/n(SiO2)能有效缩短晶化时间;n(NaOH)/n(SiO2)和n(MPPBr2)/n(SiO2)是影响IM-5分子筛合成过程中杂晶相生成的重要因素,适当调节可有效抑制方沸石(ANA)、丝光沸石(MOR)杂晶的生成;通过优化合成条件,晶化时间可由14d缩短至6d,得到高结晶度的纯相IM-5分子筛。
文摘IM-5 zeolite was synthesized by hydrothermal crystallization method with 1,5-bis(N-methylpyrrolidinium)pentane bromide using the precursors N-methylpyrrolidine and 1,5-dibromopentane as raw materials of template after pre-reaction,and then aluminum,alkali,water and silicon sources were added into the reaction system.The effects of the proportion of precursors and other materials and the reaction conditions on the crystallinity,crystal morphology and pore structure of the synthesized zeolites were systematically investigated,which provided the basic data for industrial production.The physical properties of the synthesized samples were analyzed by XRD,SEM,and N2 adsorptiondesorption techniques,and the catalytic performance of the samples was evaluated.The results show that IM-5 zeolite can be synthesized effectively by using the template pre-reaction method,and its physical properties and catalytic activity in catalytic alkylation of benzene and methanol are comparable to those of industrial samples synthesized by traditional method.
