From Al-SBA-15 to Ga-SBA-15: Morphology and acidity evolution in the acid-free synthesis

Tuning the morphological and acidic properties of mesoporous molecular sieve materials is highly valuable for catalyst design towards reactions involving large molecules. In this work, a series Ga-containing SBA-15 ordered (OMMs) were synthesized following acid-free strategy. Ga-SBA-15 exhibits an acid amount 0.48 mmol/g, comparable to Al-SBA-15 (0.45 mmol/g). addition, it found that straight short stick particles integrally bended upon replacement Al with Ga tendency continuous incremental addition gallium, until fully transforms into dispersed isolated bending Ga-SBA-15. Owing improved interparticle-type mesoporosity derived from particles, active sites on external surface are accessible As property, Brönsted-type property changed Lewis-type acidity gallium. case, more than 93% strong confirmed as Lewis characteristic. On other hand, Low Density Polyethylene (LDPE) faster decomposition rate over Al–Ga bimetallic doped (galloaluminosilicate) catalysts. • Replacement induces evolution shape. hierarchical pore structure solely composed mesopores.