Ni-exchanged AlSBA-15 mesoporous materials as outstanding catalysts for ethylene oligomerization
Résumé
Ni-exchanged mesoporous materials with SBA-15 topology
were prepared by post-synthesis alumination of SBA-15 silica with
sodium aluminate at room temperature, followed by ion exchange with
nickel. Exploration of various parameters resulted in a simple preparation
method for catalysts with perfect pore system and aluminium
tetrahedrally coordinated in the silica framework for Si/Al > 6. These
properties were proved by using appropriate characterisation techniques,
including powder X-ray diffraction, N2 sorption, TEM, and
27Al MAS NMR. Ni-AlSBA-15 exhibited outstanding catalytic properties
in the oligomerization reaction of ethylene performed at 150 °C
and 3.5MPa. Activity up to 175 g of oligomers per gram of catalyst per
hour was the highest reported to date with Ni-based solid catalysts.