Paper Title:
Aluminas by Thermal Activation of Fibrillar Pseudoboehmite Powders
  Abstract

The aluminum monohydroxide pseudoboehmite is a common precursor for catalysts and ad/absorbents. Fibrillar pseudoboehmite powders were synthesized by the same preparation method from aqueous sols but aged in different times: 24, 48 and 168 hours. The sol particles were from fibrillar pseudoboehmite; the average length of the microfibrils changed sample to sample, the sizes increasing with the thermal aging time. The sols were dried by different methods: at room temperatures, forming a solid membrane; spray dried; dried at 60°C and 110°C from a gel from the sol aged 168 hours; all were fired between 200°C and 1000°C in oxidative atmosphere to produce activated transition aluminas. The phases formed was identified by XRD. The aim of the present paper is to present data showing that method of drying the sol has an effect on the temperature of formation of alpha-alumina due to the anisodiametric shape of the pseudoboehmite crystals.

  Info
Periodical
Materials Science Forum (Volumes 498-499)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
658-662
DOI
10.4028/www.scientific.net/MSF.498-499.658
Citation
V. F.J. Kozievitch, G.A. Rocha, W.S. Maia, P. K. Kiyohara, A.C. V. Coelho, P. Souza Santos, "Aluminas by Thermal Activation of Fibrillar Pseudoboehmite Powders", Materials Science Forum, Vols. 498-499, pp. 658-662, 2005
Online since
November 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Qing Rong Wei, Xiu Dong Yang, Jian Lu, Bo Zhang, Bo Jiang, Hong Song Fan, Ji Yong Chen, Zhong Wei Gu, Xing Dong Zhang
Abstract:As a natural biomaterial, collagen especially pepsin-solubilized collagen (type I) has been used widely in biomedical fields due to its...
929
Authors: Stefano Amadori, E. Bonetti, Ilaria Cappelloni, Roberto Montanari
Chapter 8: Miscellanea, High and Low Damping, Techniques
Abstract:The work describes the anelastic behaviour of human dentin below room temperature. Human molars, extracted from individuals as part of their...
455
Authors: Jing Wang, Hong Hua Xu, Yan Xu
Chapter 6: Biological Chemistry, Pharmaceutical, Medicine and Biomedical Engineering
Abstract:Compared with β-lactoglobulin or WPI, the complex compositions for whey protein concentrate (WPC) impacted the nano-fibrils formation, the...
1268
Authors: Yan Wu, Zhi Hui Wu, Xu Jun Zhang, Ji Lei Zhang, Xiao Xing Yan
Chapter 1: Micro/Nano Materials, Technologies and Application
Abstract:The fast-growing Eucalyptus (E. Europhylla) was used as the raw materials to prepare for micro/nanocellulose fibrils. The morphology changes...
526