Production of meso- and giga-porous zirconia particles - An improved multi-step particle aggregation process

Abhinandan Pattanayak, Anuradha Subramanian

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Macro- and giga-porous zirconia supports were prepared from a 20% colloidal sol of zirconia (ZrO2) by a combination of a polymer-induced colloid aggregation (PICA) process and the oil emulsion (OE) method. The effect of the pH of the initial sol on the size of the PICA particles, and subsequently on the final product, made by oil-emulsion assisted aggregation of the PICA particles was thoroughly investigated. Both the PICA and the OE methods were further optimized for performance. Particle morphology and porosity of the resultant particles were characterized by scanning electron microscopy, mercury intrusion-extrusion porosimetry, and nitrogen adsorption-desorption sorptometry. The supports were comprised of stable aggregates of 50-250 μm in size. The pore and throat size distributions showed narrow bi-modal distributions over two distinct size scales: 10-100 nm and 600-3000 nm. In addition, different combinations of aggregation techniques and porous supports prepared in previous steps for use in a subsequent aggregation were evaluated. Optimal amounts of zirconia sol and 10-100 micron porous spherical particles produced by the OE method in an earlier step were combined in an additional OE process to yield stable giga-porous supports. Porous zirconia particles obtained after calcination and sintering had particle sizes of 0.15-3.5 mm and multimodal pore and throat distributions over a range of 50 nm-8 μm.

Original languageEnglish (US)
Pages (from-to)359-366
Number of pages8
JournalPowder Technology
Volume192
Issue number3
DOIs
StatePublished - Jun 25 2009

Fingerprint

Zirconia
Agglomeration
Emulsions
Colloids
Oils
Polymers
Polymethyl Methacrylate
Sols
Particles (particulate matter)
zirconium oxide
Mercury
Calcination
Extrusion
Macros
Desorption
Nitrogen
Sintering
Porosity
Particle size
Adsorption

Keywords

  • Catalyst
  • Giga-porous
  • Macro-porous
  • Oil emulsion
  • Polymer induced colloidal aggregation
  • Zirconia

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Production of meso- and giga-porous zirconia particles - An improved multi-step particle aggregation process. / Pattanayak, Abhinandan; Subramanian, Anuradha.

In: Powder Technology, Vol. 192, No. 3, 25.06.2009, p. 359-366.

Research output: Contribution to journalArticle

@article{50b245175dab45cc966b2e8b30d7a17f,
title = "Production of meso- and giga-porous zirconia particles - An improved multi-step particle aggregation process",
abstract = "Macro- and giga-porous zirconia supports were prepared from a 20{\%} colloidal sol of zirconia (ZrO2) by a combination of a polymer-induced colloid aggregation (PICA) process and the oil emulsion (OE) method. The effect of the pH of the initial sol on the size of the PICA particles, and subsequently on the final product, made by oil-emulsion assisted aggregation of the PICA particles was thoroughly investigated. Both the PICA and the OE methods were further optimized for performance. Particle morphology and porosity of the resultant particles were characterized by scanning electron microscopy, mercury intrusion-extrusion porosimetry, and nitrogen adsorption-desorption sorptometry. The supports were comprised of stable aggregates of 50-250 μm in size. The pore and throat size distributions showed narrow bi-modal distributions over two distinct size scales: 10-100 nm and 600-3000 nm. In addition, different combinations of aggregation techniques and porous supports prepared in previous steps for use in a subsequent aggregation were evaluated. Optimal amounts of zirconia sol and 10-100 micron porous spherical particles produced by the OE method in an earlier step were combined in an additional OE process to yield stable giga-porous supports. Porous zirconia particles obtained after calcination and sintering had particle sizes of 0.15-3.5 mm and multimodal pore and throat distributions over a range of 50 nm-8 μm.",
keywords = "Catalyst, Giga-porous, Macro-porous, Oil emulsion, Polymer induced colloidal aggregation, Zirconia",
author = "Abhinandan Pattanayak and Anuradha Subramanian",
year = "2009",
month = "6",
day = "25",
doi = "10.1016/j.powtec.2009.01.023",
language = "English (US)",
volume = "192",
pages = "359--366",
journal = "Powder Technology",
issn = "0032-5910",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Production of meso- and giga-porous zirconia particles - An improved multi-step particle aggregation process

AU - Pattanayak, Abhinandan

AU - Subramanian, Anuradha

PY - 2009/6/25

Y1 - 2009/6/25

N2 - Macro- and giga-porous zirconia supports were prepared from a 20% colloidal sol of zirconia (ZrO2) by a combination of a polymer-induced colloid aggregation (PICA) process and the oil emulsion (OE) method. The effect of the pH of the initial sol on the size of the PICA particles, and subsequently on the final product, made by oil-emulsion assisted aggregation of the PICA particles was thoroughly investigated. Both the PICA and the OE methods were further optimized for performance. Particle morphology and porosity of the resultant particles were characterized by scanning electron microscopy, mercury intrusion-extrusion porosimetry, and nitrogen adsorption-desorption sorptometry. The supports were comprised of stable aggregates of 50-250 μm in size. The pore and throat size distributions showed narrow bi-modal distributions over two distinct size scales: 10-100 nm and 600-3000 nm. In addition, different combinations of aggregation techniques and porous supports prepared in previous steps for use in a subsequent aggregation were evaluated. Optimal amounts of zirconia sol and 10-100 micron porous spherical particles produced by the OE method in an earlier step were combined in an additional OE process to yield stable giga-porous supports. Porous zirconia particles obtained after calcination and sintering had particle sizes of 0.15-3.5 mm and multimodal pore and throat distributions over a range of 50 nm-8 μm.

AB - Macro- and giga-porous zirconia supports were prepared from a 20% colloidal sol of zirconia (ZrO2) by a combination of a polymer-induced colloid aggregation (PICA) process and the oil emulsion (OE) method. The effect of the pH of the initial sol on the size of the PICA particles, and subsequently on the final product, made by oil-emulsion assisted aggregation of the PICA particles was thoroughly investigated. Both the PICA and the OE methods were further optimized for performance. Particle morphology and porosity of the resultant particles were characterized by scanning electron microscopy, mercury intrusion-extrusion porosimetry, and nitrogen adsorption-desorption sorptometry. The supports were comprised of stable aggregates of 50-250 μm in size. The pore and throat size distributions showed narrow bi-modal distributions over two distinct size scales: 10-100 nm and 600-3000 nm. In addition, different combinations of aggregation techniques and porous supports prepared in previous steps for use in a subsequent aggregation were evaluated. Optimal amounts of zirconia sol and 10-100 micron porous spherical particles produced by the OE method in an earlier step were combined in an additional OE process to yield stable giga-porous supports. Porous zirconia particles obtained after calcination and sintering had particle sizes of 0.15-3.5 mm and multimodal pore and throat distributions over a range of 50 nm-8 μm.

KW - Catalyst

KW - Giga-porous

KW - Macro-porous

KW - Oil emulsion

KW - Polymer induced colloidal aggregation

KW - Zirconia

UR - http://www.scopus.com/inward/record.url?scp=63549118429&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=63549118429&partnerID=8YFLogxK

U2 - 10.1016/j.powtec.2009.01.023

DO - 10.1016/j.powtec.2009.01.023

M3 - Article

AN - SCOPUS:63549118429

VL - 192

SP - 359

EP - 366

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

IS - 3

ER -