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MesoporousSBA-15 was synthesized and modified with 3chloropropyltrimethoxysilane and then used in immobilization of creatinine groups, which were employed to introduce Y 3+ and Ce 3+ to give rise to two novel yttrium and cerium catalysts: SBA-15@Creatinine@M (M = Y and Ce).The structures of the SBA-15@Creatinine@M catalysts were determined using various techniques. These catalysts offered outstanding catalytic performances in the oxidation of sulfides to sulfoxides and in the preparation of 5-substituted 1H-tetrazoles. An important characteristic of the SBA-15@Creatinine@M catalysts is that they are very stable without a considerable decrease in their catalytic performance lasting seven cycles.

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