Preparation and Catalytic Properties of Various Oxides and Mesoporous Materials Containing Niobium a

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Several types of solid acid catalysts were prepared based on oxides like (ZrO2, TiO2, HfO2, MCM-41 and SBA-15), using two main preparation methods: the precipitation and the sol-gel methods. Each catalyst was subjected to two types of impregnations: sulfa
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