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Chemistry of MaterialsVolume 15, Issue 25, 16 December 2003, Pages 4745-4750

Manganese-Containing Silica-Based Microporous Molecular Sieve MnS-1: Synthesis and Characterization(Article)

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  • aNational Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Serbia
  • bNova Gorica Polytechnic, Vipavska 13, 5000 Nova Gorica, Serbia
  • cInstitute Jožef Stefan, Jamova 39, 1000 Ljubljana, Serbia
  • dLab. Catalyse and Spectrochimie, ISMRA-CNRS, 6 Boulevard Maréchal Juin, 14050 Caen Cedex, Serbia
  • eFaculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia
  • fBiotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia

Abstract

Manganese-containing silicalite-1 (MnS-1) was synthesized hydrothermally in the presence of the structure-directing agent (template) tetraethylammonium hydroxide (TEAOH) for the first time. The highly crystalline MnS-1 crystallized from a gel with a molar composition of 2:1:1:50:25:935 Na2O:K 2O:MnO:SiO2:TEAOH:H2O at 175 °C after 3 days. The product was thermally stable up to 700 °C in air. The template-free MnS-1 was prepared by calcination at 550 °C in an oxygen flow. The incorporation of manganese into the framework sites of silicalite-1 was suggested by elemental, thermogravimetric, and cation exchange analyses. The X-ray absorption spectroscopic methods XANES and EXAFS confirmed the incorporation of Mn3+ into a silicalite-1 framework. FT-IR spectroscopic studies of CO adsorption at 100 K on the MnS-1 revealed the Lewis acidity of the sample and the presence of both Mn3+ and Mn 2+ cations in the structure.

Indexed keywords

Engineering controlled terms:Absorption spectroscopyAcidityCalcinationCrystalline materialsCrystallizationFourier transform infrared spectroscopyGas adsorptionGelsIon exchangeManganese compoundsMicroporous materialsMolecular sievesPositive ionsSilicaThermogravimetric analysis
Engineering uncontrolled termsLewis acidityMolar composition
Engineering main heading:Materials science
EMTREE drug terms:Lewis acidmanganesesilicon dioxidetetrylammonium
EMTREE medical terms:adsorptionarticlecation exchangecrystallizationgelinfrared spectroscopyporosityscanning electron microscopysynthesisthermogravimetrythermostabilityX ray powder diffraction

Chemicals and CAS Registry Numbers:

manganese, 16397-91-4, 7439-96-5; silicon dioxide, 10279-57-9, 14464-46-1, 14808-60-7, 15468-32-3, 60676-86-0, 7631-86-9; tetrylammonium, 2567-83-1, 2604-85-5, 66-40-0, 77-98-5

  • ISSN: 08974756
  • CODEN: CMATE
  • Source Type: Journal
  • Original language: English
  • DOI: 10.1021/cm031091c
  • Document Type: Article
  • Publisher: American Chemical Society

  Tušar, N.N.; National Institute of Chemistry, Hajdrihova 19, Serbia;
© Copyright 2019 Elsevier B.V., All rights reserved.

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