Hierarchical MTW zeolites in tetrahydropyranylation of alcohols: comparison of bottom-up and top-down methods

Ondřej Veselý, Hao Pang, Simon M. Vornholt, Michal Mazur, Jihong Yu, Maksym Opanasenko, Pavla Eliášová

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Abstract

Despite a widespread application of zeolites in catalysis, these microporous materials still suffer from a low accessibility of active sites located deep in crystals due to limited size of channels (< 1 nm). Here, we prepared a series of micro-mesoporous zeolites with MTW topology and similar Si/Al molar ratio (50). Two topical approaches were applied here: i. bottom-up synthesis with a surfactant-SDA leading to so-called nanosponge material; ii. top-down desilication of bulk crystals by NaOH solution in the presence of tetraalkylammonium cations (TAA+). Prepared materials were characterized by powder X-ray diffraction, sorption of nitrogen, adsorption of pyridine and di-tert-butyl-pyridine followed by FTIR, solid state 27Al NMR, ICP-OES, SEM, TEM, and STEM-EDS. It was found that the desilication of MTW in the presence of TAA+ proceeds in different pathway compared to well-studied MFI. This variance was attributed to the different dimensionality of their channel systems (1D vs. 3D). Materials were tested in tetrahydropyranylation of alcohols differing in a chain length and degree of branching. The nanosponge MTW shows generally very good performance. Nevertheless, in cases of the branched alcohols MTW materials desilicated in the presence of TAA+ exhibited comparable or even higher activity than nanosponge based on TOF values. Therefore, desilicated MTW presents cheaper and equally or more effective catalyst compared to nanosponge material with the same topology.
Original languageEnglish
Pages (from-to)123-134
JournalCatalysis Today
Volume324
Early online date15 Jun 2018
DOIs
Publication statusPublished - 1 Mar 2019

Keywords

  • Zeolite
  • MTW
  • Hierarchical porosity
  • Tetrahydropyranylation of alcohols
  • Nanosponge
  • Desilication

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