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Title: Synthesis and catalytic activity of polysaccharide templated nanocrystalline sulfated zirconia

Nanoscaled materials are of great interest due to their unique enhanced optical, electrical and magnetic properties. Sulfate-promoted zirconia has been shown to exhibit super acidic behavior and high activity for acid catalyzed reactions. Nanocrystalline zirconia was prepared in the presence of polysaccharide template by interaction between ZrOCl{sub 2}⋅8H{sub 2}O and chitosan template. The interaction was carried out in aqueous phase, followed by the removal of templates by calcination at optimum temperature and sulfation. The structural and textural features were characterized by powder XRD, TG, SEM and TEM. XRD patterns showed the peaks of the diffractogram were in agreement with the theoretical data of zirconia with the catalytically active tetragonal phase and average crystalline size of the particles was found to be 9 nm, which was confirmed by TEM. TPD using ammonia as probe, FTIR and BET surface area analysis were used for analyzing surface features like acidity and porosity. The BET surface area analysis showed the sample had moderately high surface area. FTIR was used to find the type species attached to the surface of zirconia. UV-DRS found the band gap of the zirconia was found to be 2.8 eV. The benzylation of o-xylene was carried out batchwise in atmosphericmore » pressure and 433K temperature using sulfated zirconia as catalyst.« less
Authors:
;  [1]
  1. Mahatma Gandhi University Regional Research Center in Chemistry, Department of Chemistry, Mar Athanasius College, Kothamangalam-686666, Kerala (India)
Publication Date:
OSTI Identifier:
22264000
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1576; Journal Issue: 1; Conference: OMTAT 2013: 2. international conference on optoelectronic materials and thin films for advanced technology, Kochi, Kerala (India), 3-5 Jan 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AMMONIA; ATMOSPHERIC PRESSURE; CALCINATION; CRYSTALS; FOURIER TRANSFORMATION; INFRARED SPECTRA; INTERACTIONS; MAGNETIC PROPERTIES; NANOSTRUCTURES; OLIGOSACCHARIDES; POLYSACCHARIDES; SCANNING ELECTRON MICROSCOPY; SULFATES; SURFACE AREA; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; XYLENES; ZIRCONIUM OXIDES