Vanadium catalysts supported on Al(Zr)-MCM-41-type materials were prepared by impregnation. Textural and structural properties, elemental composition and electronic structure were determined by N₂ physisorption, small-angle XRD, SEM–EDX and UV–vis DRS, respectively. Al-containing materials showed mostly of Al framework and a small fraction of Al extra-framework species. Zr-containing materials presented almost exclusively small clusters of Zr_xO_y covering the MCM-41 matrix. Vanadium catalysts, showed the presence of isolated V⁵⁺ species and to a lesser extent polymeric chains likely as small crystallites of V₂O₅. The catalytic results revealed that VAlM30 catalyst, characterized by a Si/Al atomic ratio of 30, was the most active in thiophene hydrodesulfurization, which could be associated to better textural properties and high dispersion of the vanadium species.

中文翻译：

---

用Al或Zr结构改性的MCM-41负载的钒催化剂用于噻吩加氢脱硫

通过浸渍制备负载在Al（Zr）-MCM-41型材料上的钒催化剂。N ₂物理吸附，小角XRD，SEM-EDX和UV-vis DRS分别确定了结构和结构性质，元素组成和电子结构。含铝材料显示出大部分为铝骨架，少量为铝骨架外物种。含Zr的材料几乎只包含覆盖MCM-41基质的Zr _x O _y小簇。钒催化剂显示存在孤立的V ⁵⁺物种，并在较小程度上表现为V ₂ O _5的微晶形式的聚合物链。催化结果表明，Si / Al原子比为30的VAlM30催化剂在噻吩加氢脱硫中活性最高，这可能与钒的更好的织构性质和高分散性有关。