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Preparation and characterisation of metal oxides supported on SBA-15 as methane combustion catalysts

机译：SBA-15担载甲烷燃烧催化剂的金属氧化物的制备与表征

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摘要

A high dispersion of Co3O4 and Mn3O4 nanoparticles on SBA-15 mesoporous silica was carried out thanks to a two-solvent impregnation method. This kind of preparation allows a proper control of both the metal oxides loading (7 or 30 wt.%) and the particle sizes (10—12 nm). A complete set of physico-chemical characterisations of C03O4 and Mn3O4 supported oxides on SBA-15 was realized using several techniques such as XRD, BET, TEM and XPS, to correlate the structures of the materials with their catalytic activities.Co3O4/SBA-I5 and Mn3O4/SBA-15, 7% in weight, exhibit a high catalytic performance in the combustion of methane under Lower Explosive Limit (LEL) conditions, comparable to the well-known LaBO3 (B = Co or Mn) perovskite-type. The efficiency of the catalysts can be explained by the organised porous meso-structure of the SBA-15. Indeed, the mesoporous support creates a confinement medium which permits a high dispersion of metal oxide nanoparticles. The Co3O4 and Mn3O4 nanoparticles supported on SBA-15 become therefore novel efficient combustion catalysts at low metal oxides' loading.
机译：由于采用了两种溶剂的浸渍方法，使得Co3O4和Mn3O4纳米颗粒在SBA-15中孔二氧化硅上得到了高度分散。这种制备可以适当控制金属氧化物的负载量（7或30 wt。％）和粒径（10-12 nm）。使用XRD，BET，TEM和XPS等多种技术实现了SBA-15上由CO3O4和Mn3O4负载的氧化物的一整套理化表征，以将材料的结构与其催化活性相关联.Co3O4 / SBA-I5重量比为7％的Mn3O4 / SBA-15在爆炸下限（LEL）条件下的甲烷燃烧中具有很高的催化性能，与众所周知的LaBO3（B = Co或Mn）钙钛矿型相当。催化剂的效率可以通过SBA-15的有序多孔介观结构来解释。实际上，中孔载体产生限制介质，其允许金属氧化物纳米颗粒的高度分散。因此，在低金属氧化物负载下，负载在SBA-15上的Co3O4和Mn3O4纳米颗粒成为新型的高效燃烧催化剂。

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