Author:
Kang Ting-Xia ,Bi Ao-Xiang ,Zhu Jun ,
Abstract
A series of the MoO3/γ-Al2O3 samples is prepared by mechanically mixing MoO3 with γ-Al2O3 powder. The solid state dispersion of the MoO3 in to the porous γ-Al2O3 is studied by SEM, XRD, XPS, TG/DTA, and positron annihilation spectroscopy. The positron annihilation lifetime spectra of the MoO3/γ-Al2O3 are measured as a function of the mass ratio of MoO3, heating temperature, heating time and in a way that the MoO3 is loaded gradually, separately. The experimental results show the process of the thermal dispersion of the MoO3 into the γ-Al2O3 support. It is shown that the MoO3 disperses into the outer surface first, and then into the secondary pores and the micro pores. The gradual Loading can make MoO3 effectively dispersed into γ-Al2O3. Grinding can also affecte the thermal dispersion process.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
Reference17 articles.
1. ACˇG apek P, Hejtmnek V, Brabec L, Ziknov A, Ko AcˇG i ArˇG ík M 2007 Chem. Eng. Sci. 62 5117
2. Ko AcˇG í P, těpnek F, Kubí AcˇG ek M, Marek M 2007 Chem. Eng. Sci. 62 5380
3. Dong L, Chen Y 2000 Chin. J. Inorg. Chem. 16 250 (in Chinese) [董 林、 陈 懿 2000 无机化学学报 16 250]
4. Xu X P, Zhao B Y, Xie Y C, Tang Y Q, Yang X C 1992 Chin. J. Catal. 13 97 (in Chinese) [徐献平、 赵璧英、 谢有畅、 唐有祺、 杨先春 1992 催化学报 13 97]
5. Liu Y J, Xie Y C, Ming J, Liu J, Tang Y Q 1982 Chin. J. Catal. 3 262 (in Chinese) [刘英骏、 谢有畅、 明 晶、 刘 军、 唐有祺 1982 催化学报 3 262]