Abstract
Mesoporous GaSBA-15 molecular sieves having a silicon-to-gallium (molar) ratio of 10–60 were synthesised using post-treatment procedure. Powder X-ray diffraction, nitrogen adsorption and transmission electron microscopy were used to evaluate the efficiency of the galliation method and its effect on the pore structure of the material. The results suggest that gallium was well incorporated inside the SBA-15 material and that the pore structure closely depends on the gallium loading. At low gallium loading (Si/Ga>10) the pore size of the SBA-15 was not altered while at higher gallium loading a significant pore size modification was observed. The catalytic activity of GaSBA-15 materials has been evaluated in the liquid-phase Friedel-Crafts acylation of anisole with benzoyl chloride. A conversion of 98% of benzoyl chloride was reached over GaSBA-15 materials (10≤Si/Ga≤60) after 24h of reaction with a 92 % selectivity towards the desired para-methoxybenzophenone. The GaSBA-15 catalyst also exhibits a very stable catalytic activity as a function of cycling test as no deactivation was observed after each test. On the other hand, nanoporous zeolite HBEA exhibited a higher activity during the first test but a drastic deactivation was observed on the following tests indicating a strong deactivation during the course of the reaction.
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