Fluoride ions assistant synthesis of extremely hydrothermal stable Al-SBA-15 with controllable Al content

In this paper, extremely hydrothermal stable mesoporous Al-SBA-15 with controllable Al content has been synthesized by using triblock copolymer (P123) as template under an assistance of NaF at 160 °C. This kind of material was characterized by powder X-ray diffraction (XRD), N2 sorption isotherms, transmission electron microscopy (TEM), 27Al MAS NMR, energy-dispersive X-ray spectroscopy (EDX), and ammonia-temperature programmed desorption (NH3-TPD). It was found that nearly all Al added into the initial reaction mixture can be introduced into the product and thus-synthesized Al-SBA-15 maintained the well-ordered mesostructure and high surface area, large pore size, thick pore wall and high pore volume even after being hydrothermally treated at 100 °C for 300 h or steamed at 600 °C for 6 h. This kind of Al-SBA-15 is an efficient catalyst for the protection of carbonyl compound reactions under mild conditions.

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► Extremely hydrothermal stable mesoporous Al-SBA-15 was synthesized.
► NaF was used as an assistant, which improved the hydrothermal stability.
► The reduction of BET surface area was very low after hydrothermally treatment.
► This kind of Al-SBA-15 was an efficient catalyst and had good reusability.