The gallium-incorporated mesoporous silica material Ga-HMS-n (where n is the Si/Ga ratio in the precursor gel = 30, 60, 90) was successfully synthesized at ambient temperature using hexadecylamine as the template agent. The obtained materials were analyzed by XRD, transmission electron microscopy TEM and nitrogen adsorption to determine the structural order and the textural properties. It has been observed by ⁷¹Ga MAS-NMR spectroscopy that gallium atoms are exclusively in tetrahedral coordination for all samples. Temperature-programmed desorption of pyridine showed that Ga-HMS-30 has a higher number of strong acid sites. The catalyst Ga-HMS-30 showed bigger performance in the acid-catalyzed tertiary butylation of phenol employing tert-butanol as the alkylation agent. In fact, a high phenol conversion of 75.3% is observed for this catalyst at a reaction temperature of 433K. However, the 4-TBP yield amounts to 41.8% and the 2,4-DTBP yield corresponds to 30.3%. Furthermore, due to the large pore size, which allows a faster diffusion of reactants and products, catalyst deactivation of Ga-HMS-30 was not observed even after reaction for 5 h.

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