Space-confined preparation of high surface area tungsten oxide and tungsten nitride inside the pores of mesoporous silica SBA-15

Simon Meyer, Hans Beyer, Klaus Köhler, Annemette Hindhede Jensen, Erik Christensen, Niels Bjerrum

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

For the direct preparation of high surface area nitride materials, a lack of suitable precursors exists. Indirect preparation by gas phase nitridation (e.g. by ammonia) requires high temperatures and often results in sintering. The present work demonstrates that the space-confined preparation of W2N inside the pores of ordered mesoporous silica SBA-15 offers a possibility to reduce sintering phenomena and thus to obtain smaller particles, porous structures and a higher surface area material. The preparation was pursued in a two-step approach. First, WO3 was introduced into the channels of SBA-15 and second, ammonolysis was conducted for its conversion to W2N. When performed in the presence of the exo-template, SBA-15 acts as a stabilizer and small W2N particles (6-7 nm) with a high specific surface area (40 m(2) g(-1)) are obtained after template removal. When the template is, however, removed before nitridation, it cannot stabilize the W2N particles and enhanced sintering occurs. (C) 2015 Elsevier Inc. All rights reserved.
Original languageEnglish
JournalMicroporous and Mesoporous Materials
Volume211
Pages (from-to)147-151
Number of pages5
ISSN1387-1811
DOIs
Publication statusPublished - 2015

Keywords

  • CHEMISTRY,
  • NANOSCIENCE
  • MATERIALS
  • GAS-SENSING APPLICATIONS
  • MOLYBDENUM
  • REDUCTION
  • CATALYSIS
  • CARBIDE
  • High surface area
  • Mesoporous tungsten oxide
  • Tungsten nitride
  • Space-confined preparation

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