Nb-modified MgAlmixed oxide catalysts were prepared by ion exchange using an MgAl hydrotalcite and peroxoniobate complex as precursors. After calcination, the Nb-MgAl revealed to be a composite material (MgAl mixed oxide with segregated Nb₂O₅ nanoparticles), with an increased specific surface area (229 m² g⁻¹) compared to bare MgAl (88 m² g⁻¹). XRD confirmed that part of the Nb atoms was inserted in the MgAl lattice thus causing the oxide doping. Furthermore, the Nb precursor favored the incorporation of a high amount of Nb in the catalyst (18 wt.%). Reactions performed in a continuous flow fixed-bed reactor (PBR) on a pilot scale showed that the MgAl and Nb-MgAl are quite active and stable catalysts for the conversion of the waste glycerol (> 90 %), as generated in the biodiesel industry. The valuable chemicals obtained (i.e., diglycerol, formic acid, and dioxane) demonstrates the potential industrial use of the catalysts presented in this work.

通过使用MgAl水滑石和过氧铌酸盐络合物作为前体进行离子交换，制备了Nb改性的MgAl混合氧化物催化剂。煅烧后，Nb-MgAl揭示为一种复合材料（具有分离的Nb ₂ O ₅纳米颗粒的MgAl混合氧化物），比裸MgAl（88 m ²  g- ）具有更大的比表面积（229 m ²  g ^-1）^{。 1个}）。XRD证实Nb原子的一部分插入MgAl晶格中，从而引起氧化物掺杂。此外，Nb前体有利于在催化剂中掺入大量的Nb（18重量％）。在中试规模的连续流固定床反应器（PBR）中进行的反应表明，MgAl和Nb-MgAl是非常活跃且稳定的催化剂，可转化为生物柴油行业中产生的废甘油（> 90％） 。获得的有价值的化学物质（例如，甘油二酸，甲酸和二恶烷）证明了这项工作中提出的催化剂的潜在工业用途。