The surface acidity of mesoporous molecular sieves of aluminium and titanium was evaluated using four different techniques: n-butylamine volumetry, cyclohexylamine thermodesorption, temperature programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the acid sites were determined and correlated to the results of a probe reaction of anthracene oxidation to 9,10-anthraquinone (in liquid phase). In general, the surface acidity was highly influenced by the nature, location and coordination of the metal species (Al and Ti) in the mesoporous samples. Moderate to strong Brönsted acid sites were identified for the Al-MCM-41 sample in a large temperature range. For mesoporous materials containing Ti, the acidity was represented by a combination of weak to moderate Brönsted and Lewis acid sites. Higher acidity of moderate strength, found in the Ti-HMS sample, enhanced both conversion and selectivity in the oxidation reaction of anthracene, producing higher yields of 9,10-anthraquinone.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/15750 must be provided.

1. Preferential oxidation of CO (CO-PROX) catalyzed by CuO/CeO₂ supported on zirconium containing mesoporous silica
2. In operando XAS study of porous based catalysts for the selective catalytic reduction of NO with low N₂O emissions
3. Vanadium oxide-porous phosphate heterostructure catalysts for the selective oxidation of H₂S to sulphur.