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Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors

Recyclable aggregates of mesoporous titania with different anatase–rutile ratios have been prepared by thermal treatments of either amorphous or peptized precursors. These last two have been obtained by hydrolysis of either Ti(OC(2)H(5))(4) or of Ti(OC(2)H(5))(4) in mixture with 5 mol % Zr(OC(3)H(7)...

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Autores principales: Mascolo, Maria Cristina, Ring, Terry Arthur
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5872960/
https://www.ncbi.nlm.nih.gov/pubmed/29510566
http://dx.doi.org/10.3390/ma11030381
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author Mascolo, Maria Cristina
Ring, Terry Arthur
author_facet Mascolo, Maria Cristina
Ring, Terry Arthur
author_sort Mascolo, Maria Cristina
collection PubMed
description Recyclable aggregates of mesoporous titania with different anatase–rutile ratios have been prepared by thermal treatments of either amorphous or peptized precursors. These last two have been obtained by hydrolysis of either Ti(OC(2)H(5))(4) or of Ti(OC(2)H(5))(4) in mixture with 5 mol % Zr(OC(3)H(7))(4) at room temperature in the presence of NH(4)OH as a catalyzing agent. The anatase–rutile ratio, the recyclable aggregates of the nano-sized particles, the mesoporosity, the surface area and the crystallinity of the resulting crystallized products of titania can be controlled by the synthesis parameters including: concentration of ammonia catalyst, stirring time and concentration of the peptizing HNO(3), drying method of peptized precursors, calcination temperature, and finally the ramp rate up to the titania crystallization temperature. A broad range of synthesis parameters control the crystal sizes of titania particles produced. This allows catalyst preparation with very different crystal size, surface area, anatase to rutile crystal ratio and various mesoporous structures. Drying by lyophilization of precursors reduce the aggregation of the primary particles giving micro-/macroporous structures.
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spelling pubmed-58729602018-03-30 Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors Mascolo, Maria Cristina Ring, Terry Arthur Materials (Basel) Article Recyclable aggregates of mesoporous titania with different anatase–rutile ratios have been prepared by thermal treatments of either amorphous or peptized precursors. These last two have been obtained by hydrolysis of either Ti(OC(2)H(5))(4) or of Ti(OC(2)H(5))(4) in mixture with 5 mol % Zr(OC(3)H(7))(4) at room temperature in the presence of NH(4)OH as a catalyzing agent. The anatase–rutile ratio, the recyclable aggregates of the nano-sized particles, the mesoporosity, the surface area and the crystallinity of the resulting crystallized products of titania can be controlled by the synthesis parameters including: concentration of ammonia catalyst, stirring time and concentration of the peptizing HNO(3), drying method of peptized precursors, calcination temperature, and finally the ramp rate up to the titania crystallization temperature. A broad range of synthesis parameters control the crystal sizes of titania particles produced. This allows catalyst preparation with very different crystal size, surface area, anatase to rutile crystal ratio and various mesoporous structures. Drying by lyophilization of precursors reduce the aggregation of the primary particles giving micro-/macroporous structures. MDPI 2018-03-05 /pmc/articles/PMC5872960/ /pubmed/29510566 http://dx.doi.org/10.3390/ma11030381 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mascolo, Maria Cristina
Ring, Terry Arthur
Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title_full Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title_fullStr Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title_full_unstemmed Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title_short Recyclable Aggregates of Mesoporous Titania Synthesized by Thermal Treatment of Amorphous or Peptized Precursors
title_sort recyclable aggregates of mesoporous titania synthesized by thermal treatment of amorphous or peptized precursors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5872960/
https://www.ncbi.nlm.nih.gov/pubmed/29510566
http://dx.doi.org/10.3390/ma11030381
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