Article

Adsorption

, Volume 15, Issue 2, pp 89-98

First online:

Heating effects on morphological and textural characteristics of individual and composite nanooxides

  • V. M. Gun’koAffiliated withInstitute of Surface Chemistry Email author 
  • , R. LebodaAffiliated withFaculty of Chemistry, Maria Curie-Skłodowska University
  • , J. Skubiszewska-ZiębaAffiliated withFaculty of Chemistry, Maria Curie-Skłodowska University

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Abstract

Morphological, structural and adsorption characteristics of nanooxides (fumed individual silica, alumina and titania, and composite silica/alumina, silica/titania and alumina/silica/titania) were compared after different treatments (wetting/drying, ball-milling, suspending/drying, heating) at different temperatures (373–1173 K) using low-temperature nitrogen adsorption data. The structural characteristics such as specific surface area (S BET), pore volume (V p), pore (PSD) and particle (PaSD) size distributions (calculated using self-consisting regularization procedure with respect to both PSD and PaSD), fractality, adsorption energy distributions depend differently on heating temperature because desorption of water molecularly and dissociatively adsorbed at a surface and in bulk of primary nanoparticles occurs over a wide temperature range at different rates. These processes affect both structural and energetic characteristics of nanooxides.

Keywords

Nanooxides Morphology Structural characteristics Adsorption characteristics Temperature effects