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Title of Journal: J SolGel Sci Technol

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Abbravation: Journal of Sol-Gel Science and Technology

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Springer US

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DOI

10.1002/chin.200238271

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1573-4846

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Nibased xero and aerogels as catalysts for nitro

Authors: Maria Giorgia Cutrufello Elisabetta Rombi Italo Ferino Danilo Loche Anna Corrias Maria Francesca Casula
Publish Date: 2011/04/08
Volume: 60, Issue: 3, Pages: 324-332
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Abstract

Porous nanocomposites made out of nickel dispersed on silica or alumina matrices were prepared as prospective catalysts for the nitroxidation of hydrocarbons in the form of aerogel or xerogel by adopting either a supercritical or a conventional gel drying procedure The structural and textural features of the materials were investigated by Xray diffraction transmission electron microscopy and N2 physisorption and combined to the acid/base and reducibility data as deduced by adsorption microcalorimetry and temperature programmed reduction TPR profiles The aluminabased samples are made out of nanocrystalline nickel aluminate and are mesoporous although the aerogel has larger pore volumes and surface area than the xerogel On the other hand in the silicabased samples nickel oxide nanocrystals are dispersed on amorphous silica the size of the nanocrystals being around 5 nm in the microporous xerogel and 14 nm in the mainly mesoporous aerogel TPR data point out that the aluminabased samples have similar reducibility whereas significant differences were observed in the silicasupported composites the NiO–SiO2 aerogel exhibiting improved reducibility at low temperature The NOcatalyst interaction was monitored by temperature programmed NO reaction coupled to mass spectrometry and preliminary tests on the use of the NiO–SiO2 xerogel and aerogel nanocomposites for the catalytic nitroxidation of 1methylnaphthalene to 1naphthonitrile were obtained in a fixedbed continuousflow reactor The data indicate that the aerogel exhibits larger selectivity than the corresponding xerogel pointing out the importance of tuning the sol–gel parameters in the design of porous composite materials for catalytic applications

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  1. Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes
  2. Physical–chemical explanation of fire-fighting efficiency of FHF (fast-hardening foam) based on structured silica particles
  3. Preparation and characterization of epoxy–silica networks chemically bonded through aminophenyl-trimethoxysilane
  4. Biosynthesis of silver nanoparticles using Lantana camara flower extract and its application
  5. Structure, photoluminescence and electrical properties of Eu–Nd codoped CaBi 4 Ti 4 O 15 synthesized by sol–gel method
  6. Influences of preferred orientation growth on electrical properties of ZnO:Al films by sol–gel method
  7. Synthesis of nanosized carbonated apatite by a modified Pechini method: hydroxyapatite nucleation from a polymeric matrix
  8. Effect of excess methanol addition on the morphology of sonogel-derived silica
  9. Removal of Pb(II) ions from aqueous systems using thiol-functionalized cobalt-ferrite magnetic nanoparticles
  10. Simple synthesis of Co 3 O 4 nanoflakes using a low temperature sol–gel method suitable for photodegradation of dyes
  11. The effect of PO 2,5 and AlO 1,5 additions on structural changes and crystallization behavior of SiO 2 -TiO 2 sol-gel derived glasses and thin films
  12. Antiwetting silica–gelatin nanohybrid and transparent nano coatings synthesised through an aqueous sol–gel process
  13. Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods
  14. Bioencapsulation of living yeast ( Pichia pastoris ) with silica after transformation with lysozyme gene
  15. Optical properties of yellow-light-emitting LiZnVO 4 :Eu 3+ phosphor prepared by sol–gel method
  16. CuAl 2 O 4 powder synthesis by sol-gel method and its photodegradation property under visible light irradiation
  17. GPS patch antenna performance by modification of Zn (1−x) Ca x Al 2 O 4 -based microwave dielectric ceramics
  18. Effect of thermal annealing on Nd 2 O 3 -doped silica powder prepared by the solgel process
  19. Effect of sulphate groups on catalytic properties of chromium supported by zirconia in the n -hexane aromatization
  20. Synthesis of LiCoO 2 by l -apple acid assisted sol–gel method and its electrochemical behavior in aqueous lithium-ion battery
  21. Investigation of Br–N Co-doped TiO 2 photocatalysts: preparation and photocatalytic activities under visible light
  22. Optimization of process variables and corrosion properties of a multi layer silica sol gel coating on AZ91D using the Box–Behnken design
  23. Al 2 O 3 /TiO 2 core/shell powder derived by novel sol–gel routes
  24. A new surface modification method to improve the dispersity of nano-silica in organic solvents
  25. Synthesis of BiFeO 3 nanoparticles with small size
  26. Sustained release drug delivery using supramolecular hydrogels of the triblock copolymer PCL–PEG–PCL and α-cyclodextrin
  27. A novel lariat - silacrown ether based in sol–gel process: synthesis, characterization and interaction study with the copper(II) ion
  28. Sol–gel doped TiO 2 nanomaterials: a comparative study
  29. Hysteresis-free, energy efficient twisted nematic liquid crystal systems based on IB-irradiated gallium-doped tin oxide films
  30. The preparation and characterization graphene-cross-linked phenol–formaldehyde hybrid carbon xerogels
  31. Preparation and characterization of silica-titania aerogel-like balls by ambient pressure drying
  32. Phosphorus-doped organic–inorganic hybrid silicon coating for improving fire retardancy of polyacrylonitrile fabric
  33. Synthesis and characterization of hollow LiNiO 2 fibers via sol-electrospinning method
  34. Improvement of electrical properties of sol–gel derived ZnO:Ga films by infrared heating method
  35. Bioactive textiles by sol–gel immobilised natural active agents
  36. Sol–gel synthesis, characterization and study of substitution effects in different gallium-containing garnets
  37. A spectroscopic study of calcium aluminate gels obtained from aluminium sec- butoxide chelated with ethyl acetoacetate in various ratios
  38. Promotion of electrochemical performance by tailoring the surface of β-Ni(OH) 2 nanosheets
  39. Improved silica xerogel film processing for MALDI-TOF–MS quantitative analysis of peptides and small molecules
  40. Characterization of nanostructured magnetite thin films produced by sol–gel processing
  41. Structural characterisation of a sol-gel copolymer synthesised from aliphatic and aromatic alkoxysilanes using 29 Si-NMR spectroscopy
  42. Preparation and electrochemical properties of V 2 O 5 submicron-belts synthesized by a sol–gel H 2 O 2 route
  43. Physico-chemical properties of ambiently dried sodium silicate based aerogels catalyzed with various acids
  44. Effect of 3-glycidoxypropyltrimethoxysilane precursor on the properties of ambient pressure dried silica aerogels
  45. Synthesis of garnet structured Li 7+ x La 3 Y x Zr 2- x O 12 ( x = 0–0.4) by modified sol–gel method
  46. Phase-separation and distribution of phenyl groups for PhTES-TEOS coatings prepared on polycarbonate substrate
  47. Comparative analysis of NdCaCoO 4 phase formation from cryogel and from solid state precursors
  48. Notable enlargement of remnant polarization for fatigue-free SrBi 4 Ti 4 O 15 thin films by La-substitution
  49. Preparation and characterisation of NdAlO 3 nanocrystals by modified sol–gel method
  50. Optical and structural characteristics of yttrium doped ZnO films using sol–gel technology
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  52. Photocatalytic degradation of indigo carmine using Nd-doped TiO 2 -decorated graphene oxide nanocomposites
  53. Small-angle X-ray scattering from wet gels prepared from co-hydrolysis of tetraethoxysilane and vinyltriethoxysilane
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