Observation on the Structure of Ordered Mesoporous Materials at High Temperature via In Situ X-Ray Diffraction

Chun Fang Zhou; Jian Hua Zhu

doi:10.4028/www.scientific.net/AMR.132.29

Paper Titles

Preface and Committees

Nanostructured Materials for Hydrogen Storage
p.1

Influences of Surface Chemistry on Dehydrogenation Kinetics of Ammonia Borane in Porous Carbon Scaffold
p.19

Observation on the Structure of Ordered Mesoporous Materials at High Temperature via In Situ X-Ray Diffraction
p.29

Synthesis of Si-Based Mesoporous Materials with Different Structural Regularity
p.38

Comparative Studies of the CoMo/MgO, CoMo/Al₂O₃ and CoMo/MgO-MgAl₂O₄ Catalysts Prepared by a Urea-Matrix Combustion Method
p.45

ZnAlFe Mixed Oxides Obtained from LDH Type Materials as Basic Catalyst for the Gas Phase Acetone Condensation
p.55

Structure Sensitivity of Sol-Gel Alkali Tantalates, ATaO₃ (A= Li, Na and K): Acetone Gas Phase Condensation
p.61

Phase Stabilization of Mesoporous Mn-Promoted ZrO₂: Influence of the Precursor
p.68

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 132Observation on the Structure of Ordered Mesoporous...

Observation on the Structure of Ordered Mesoporous Materials at High Temperature via In Situ X-Ray Diffraction

Abstract:

This short paper reports the direct observation of the structure variation of mesoporous silica at temperatures higher than 600 oC by use of an in situ XRD technique. The mesostructure of SBA-15 or other mesoporous materials such as MCM-41 became almost invisible when the temperature rose to above 600 oC, but recovered or partially recovered once the temperature decreased. Contrarily, the characteristic XRD patterns of zeolites such as ZSM-5 kept unchangeable under the same conditions. On the basis of comparative experiments performed on various mesoporous samples, it is inferred that the reversible variation of XRD patterns probably originates from the thermal shock of the pore wall, not from the permanent collapse of the mesoscopic structure in these samples. This observation indicates the special features of SBA-15 at high temperature.