On the geometric trajectories of pores during the thermal sintering of relevant catalyst supports

SCRIPTA MATERIALIA

卷:194

Article

Zarubina, Valeriya^1,2  Melian-Cabrera, Ignacio³ 

[1] Erasmus Univ, Erasmus Univ Coll EUC, Nieuwemarkt 1A, NL-3011 HP Rotterdam, Netherlands

[2] Univ Groningen, Fac Sci & Engn, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

[3] Univ La Laguna, Appl Photochem & Mat Energy Grp, Avda Astrofis Francisco Sanchez,S-N,POB 456, San Cristobal De La Lagu 38200, Sc De Tenerife, Spain

关键词: Alumina;    Coarsening;    High-resolution sorption analysis;    Mesoporous materials;    Silica;    Sintering;    Thermal treatment;   

DOI  :  10.1016/j.scriptamat.2020.113679

来源: Elsevier

【 摘 要 】

The thermal events typically encountered during the reactivation of inorganic catalytic supports have been investigated. For this, two relevant inorganic materials were studied; an amorphous silica and a gamma (gamma) alumina. The materials were thermally treated in air at temperatures ranging 700 up to 1100 degrees C and the structural and textural changes were assessed. The crystallinity was enhanced and the textural parameters decreased, but the most remarkable effect was the pore trajectory. This varies depending on the sintering mechanism, contractive sintering (silica) or coarsening (alumina), which was detected by high-resolution physisorption. The reduction in the surface area is not a good indicator of the pore changes; in addition to pore changes, the material can also suffer densification, and both effects determine the surface area. Finally, the study shows that thermal treatment is an easy way to modify the pore size of the studied materials; the gamma-alumina showing more controllability. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free