Abstract
The stability of MCM-41 after ion exchange and impregnation with cesium species and calcination was investigated. A pure silica and two Al-containing samples (Si/ Al ≅ 25 ), the latter synthesized either in the sodium or in the cesium form, were used as test samples. The conditions chosen for the various treatments were those usually employed to introduce basic species in zeolites or in mesoporous materials aiming at their use in catalysis. The results show that even mild basic media (pH≅8.5) can be detrimental to the stability of the structure and that impregnation with cesium acetate followed by calcination caused a severe damage to the structure. Al-containing samples were less resistant than the purely siliceous one to basic media.
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