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    • Key parameters to improve zeolites hierarchization in direct synthesis

      L BONETTO L B PIERELLA C SAUX

      Volume 43 Published: 29 October 2020 Article ID 0288

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/043/0288

    • Keywords

       

      Hierarchical ZSM-11; hydrothermal synthesis; soft templates; synthesis parameters; type of base.

    • Abstract

       

      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.

    • Author Affiliations

       

      L BONETTO1 L B PIERELLA1 C SAUX1

      1. Centro de Investigacion y Tecnologıa Quımica (CITeQ), UTN – CONICET, Maestro Marcelo Lopez y Cruz Roja Argentina, 5016 Cordoba, Argentina

    • Dates

       
      Published
      29 October 2020
      Manuscript received
      1 May 2020
      Accepted
      11 August 2020
      Final version published online
      29 October 2020

    • Supplementary Material

       

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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