Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method
Fraktalna analiza površine mezoporoznog aluminijum(III)-oksida sa dodatkom PEG i La(III) dobijenog sol-gel postupkom
Апстракт
Active porous alumina was prepared via a sol-gel method and subjected to thermal treatment in the temperature range 500-1200 °C. The addition of lanthanum effectively inhibited the surface area loss of the aluminas. Fractal analysis from nitrogen adsorption isotherm was used to study the pore surface roughness of alumina samples with different chemical compositions (PEG, PEG and lanthanum) and calcinations conditions in terms of the surface fractal dimension, d. The Mahnke and Mögel (MM) model was used to determine the value of d of La(III)-doped alumina. Following the MM model, the d value of the activated aluminas increased as the calcination temperature increased from 500 to 700 °C but decreased after calcination at 1000, 1100 and 1200 °C. The addition of polyethylene glycol (PEG 5600) to the boehmite sol reduced the surface fractal of the activated alumina due to the heterogeneous distribution of the pores. With increasing La(III) concentration from 0.015 to 0.045 mol La(III)/mol A...l(III), the d value of La-modified alumina samples decreased, indicating a smoother surface. The obtained PEG+La-doped boehmite sol can be used as a precursor dispersion for the deposition of mesoporous alumina coatings on stainless steel foil, by the spray pyrolysis method.
Aktivni porozni aluminijum-oksid dobijen sol-gel metodom je termički obrađen na povišenim temperaturama u intervalu od 500 do 1200 °C. Ispitivan je uticaj temperature termičke obrade i dodatka polietilen glikola (PEG) i La(III) jona na specifičnu površinu, zapreminu pora i prečnik pora, kao i fraktalnu dimenziju površine aktiviranog aluminijum-oksida. Na osnovu podataka iz adsorpcionoesorpcionih izotermi azota određen je tip pora i izračunate su vrednosti osnovnih parametara teksturalnih svojstava uzoraka. Porast temperature termičke obrade prouzrokovao je smanjenje specifične površine sa 280 na 65 m2 g-1, zapremine pora sa 0,45 na 0,27 cm3 g-1, porast preovlađujućeg prečnika pora od 3 do 6 nm i porast fraktalne dimenzije površine od 2,068 do 2,192. Dobijeni bemitni sol sa dodatkom PEG i La(III) jona može se iskoristiti kao prekursorska disperzija pri sprej-pirolitičkoj metodi sinteze aluminijum oksidnih prevlaka na nosaču od nerđajućeg čelika.
Кључне речи:
mesoporous alumina / porous structure / surface fractal dimension / sol-gelИзвор:
Journal of the Serbian Chemical Society, 2010, 75, 6, 833-843Издавач:
- Serbian Chemical Society
Финансирање / пројекти:
- Синтеза, карактеризација и тестирање каталитичких својстава специјално дизајнираних материјала (RS-MESTD-MPN2006-2010-142019)
DOI: 10.2298/JSC090922053N
ISSN: 0352-5139
WoS: 000279962300010
Scopus: 2-s2.0-77955487303
Институција/група
IHTMTY - JOUR AU - Novaković, Tatjana AU - Rožić, Ljiljana AU - Petrović, Srđan AU - Vuković, Zorica AU - Dondur, Vera PY - 2010 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/641 AB - Active porous alumina was prepared via a sol-gel method and subjected to thermal treatment in the temperature range 500-1200 °C. The addition of lanthanum effectively inhibited the surface area loss of the aluminas. Fractal analysis from nitrogen adsorption isotherm was used to study the pore surface roughness of alumina samples with different chemical compositions (PEG, PEG and lanthanum) and calcinations conditions in terms of the surface fractal dimension, d. The Mahnke and Mögel (MM) model was used to determine the value of d of La(III)-doped alumina. Following the MM model, the d value of the activated aluminas increased as the calcination temperature increased from 500 to 700 °C but decreased after calcination at 1000, 1100 and 1200 °C. The addition of polyethylene glycol (PEG 5600) to the boehmite sol reduced the surface fractal of the activated alumina due to the heterogeneous distribution of the pores. With increasing La(III) concentration from 0.015 to 0.045 mol La(III)/mol Al(III), the d value of La-modified alumina samples decreased, indicating a smoother surface. The obtained PEG+La-doped boehmite sol can be used as a precursor dispersion for the deposition of mesoporous alumina coatings on stainless steel foil, by the spray pyrolysis method. AB - Aktivni porozni aluminijum-oksid dobijen sol-gel metodom je termički obrađen na povišenim temperaturama u intervalu od 500 do 1200 °C. Ispitivan je uticaj temperature termičke obrade i dodatka polietilen glikola (PEG) i La(III) jona na specifičnu površinu, zapreminu pora i prečnik pora, kao i fraktalnu dimenziju površine aktiviranog aluminijum-oksida. Na osnovu podataka iz adsorpcionoesorpcionih izotermi azota određen je tip pora i izračunate su vrednosti osnovnih parametara teksturalnih svojstava uzoraka. Porast temperature termičke obrade prouzrokovao je smanjenje specifične površine sa 280 na 65 m2 g-1, zapremine pora sa 0,45 na 0,27 cm3 g-1, porast preovlađujućeg prečnika pora od 3 do 6 nm i porast fraktalne dimenzije površine od 2,068 do 2,192. Dobijeni bemitni sol sa dodatkom PEG i La(III) jona može se iskoristiti kao prekursorska disperzija pri sprej-pirolitičkoj metodi sinteze aluminijum oksidnih prevlaka na nosaču od nerđajućeg čelika. PB - Serbian Chemical Society T2 - Journal of the Serbian Chemical Society T1 - Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method T1 - Fraktalna analiza površine mezoporoznog aluminijum(III)-oksida sa dodatkom PEG i La(III) dobijenog sol-gel postupkom VL - 75 IS - 6 SP - 833 EP - 843 DO - 10.2298/JSC090922053N ER -
@article{ author = "Novaković, Tatjana and Rožić, Ljiljana and Petrović, Srđan and Vuković, Zorica and Dondur, Vera", year = "2010", abstract = "Active porous alumina was prepared via a sol-gel method and subjected to thermal treatment in the temperature range 500-1200 °C. The addition of lanthanum effectively inhibited the surface area loss of the aluminas. Fractal analysis from nitrogen adsorption isotherm was used to study the pore surface roughness of alumina samples with different chemical compositions (PEG, PEG and lanthanum) and calcinations conditions in terms of the surface fractal dimension, d. The Mahnke and Mögel (MM) model was used to determine the value of d of La(III)-doped alumina. Following the MM model, the d value of the activated aluminas increased as the calcination temperature increased from 500 to 700 °C but decreased after calcination at 1000, 1100 and 1200 °C. The addition of polyethylene glycol (PEG 5600) to the boehmite sol reduced the surface fractal of the activated alumina due to the heterogeneous distribution of the pores. With increasing La(III) concentration from 0.015 to 0.045 mol La(III)/mol Al(III), the d value of La-modified alumina samples decreased, indicating a smoother surface. The obtained PEG+La-doped boehmite sol can be used as a precursor dispersion for the deposition of mesoporous alumina coatings on stainless steel foil, by the spray pyrolysis method., Aktivni porozni aluminijum-oksid dobijen sol-gel metodom je termički obrađen na povišenim temperaturama u intervalu od 500 do 1200 °C. Ispitivan je uticaj temperature termičke obrade i dodatka polietilen glikola (PEG) i La(III) jona na specifičnu površinu, zapreminu pora i prečnik pora, kao i fraktalnu dimenziju površine aktiviranog aluminijum-oksida. Na osnovu podataka iz adsorpcionoesorpcionih izotermi azota određen je tip pora i izračunate su vrednosti osnovnih parametara teksturalnih svojstava uzoraka. Porast temperature termičke obrade prouzrokovao je smanjenje specifične površine sa 280 na 65 m2 g-1, zapremine pora sa 0,45 na 0,27 cm3 g-1, porast preovlađujućeg prečnika pora od 3 do 6 nm i porast fraktalne dimenzije površine od 2,068 do 2,192. Dobijeni bemitni sol sa dodatkom PEG i La(III) jona može se iskoristiti kao prekursorska disperzija pri sprej-pirolitičkoj metodi sinteze aluminijum oksidnih prevlaka na nosaču od nerđajućeg čelika.", publisher = "Serbian Chemical Society", journal = "Journal of the Serbian Chemical Society", title = "Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method, Fraktalna analiza površine mezoporoznog aluminijum(III)-oksida sa dodatkom PEG i La(III) dobijenog sol-gel postupkom", volume = "75", number = "6", pages = "833-843", doi = "10.2298/JSC090922053N" }
Novaković, T., Rožić, L., Petrović, S., Vuković, Z.,& Dondur, V.. (2010). Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method. in Journal of the Serbian Chemical Society Serbian Chemical Society., 75(6), 833-843. https://doi.org/10.2298/JSC090922053N
Novaković T, Rožić L, Petrović S, Vuković Z, Dondur V. Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method. in Journal of the Serbian Chemical Society. 2010;75(6):833-843. doi:10.2298/JSC090922053N .
Novaković, Tatjana, Rožić, Ljiljana, Petrović, Srđan, Vuković, Zorica, Dondur, Vera, "Pore surface fractal analysis of PEG and La(III)-doped mesoporous alumina obtained by the sol-gel method" in Journal of the Serbian Chemical Society, 75, no. 6 (2010):833-843, https://doi.org/10.2298/JSC090922053N . .