In this study, we propose the generation of micro/mesoporous zeolites with ZSM-11 structure by hydrothermal treatment using tetrabutylammonium hydroxide (TBAOH) as micropore structure directing agent and cetyltrimethylammonium bromide (CTAB) as mesotemplate. From many synthesis parameters evaluated (crystallization time, hydrothermal temperature, CTAB content), the type of base employed in the synthesis gel showed notorious influence in the structure, textural properties and morphology of the micro/mesoporous ZSM-11 zeolites. The samples were characterized by different techniques such as X-ray diffraction, nitrogen adsorption and desorption isotherms, Brunauer–Emmett–Teller surface area, scanning electron microscope, ICP-AES and 27 Al MAS NMR. The characterization results revealed that the crystallization time, CTAB content and type of base (NaOH, KOH, Ca(OH) 2 and NaCO 3 ) played a dominant role in controlling the formation of both microporous and mesoporous structures. The base employed in the synthesis and its concentration showed important effects on the structure and textural properties of the composite materials. It was found that to obtain the best characteristics in terms of crystallinity and textural parameters, NaOH and KOH should be employed.

中文翻译：

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直接合成中提高沸石分级的关键参数

在这项研究中，我们建议使用四丁基氢氧化铵 (TBAOH) 作为微孔结构导向剂和十六烷基三甲基溴化铵 (CTAB) 作为介孔模板，通过水热处理生成具有 ZSM-11 结构的微/介孔沸石。从评估的许多合成参数（结晶时间、水热温度、CTAB 含量）来看，合成凝胶中使用的碱类型对微/介孔 ZSM-11 沸石的结构、质地特性和形态有显着影响。通过不同的技术对样品进行表征，例如 X 射线衍射、氮吸附和解吸等温线、Brunauer-Emmett-Teller 表面积、扫描电子显微镜、ICP-AES 和 27 Al MAS NMR。表征结果表明，结晶时间、CTAB 含量和碱（NaOH、KOH、Ca(OH) 2 和 NaCO 3 ) 在控制微孔和中孔结构的形成中起主导作用。合成中使用的碱及其浓度对复合材料的结构和质地性能有重要影响。发现为了获得结晶度和结构参数方面的最佳特性，应使用 NaOH 和 KOH。