Abstract
AbstractA range of nanosize alkaline‐free gallosilicate mesoporous molecular sieves (GaMMS) were synthesized using microwave hydrothermal method and various analytical and spectroscopic techniques were employed to systematically investigate the structure, coordination geometry of gallium, acidic properties and catalytic activity. These nanosize GaMMSs exhibit high surface area (240 ∼ 720 m2/g), pore volume (1.06 ∼ 1.49 m3/g), narrow pore size distribution and nano‐particle size between 20 and 100 nm and four‐coordinated gallium site mainly, which were characterized by XRD, N2 adsorption/desorption, TEM, 71Ga MAS‐NMR and ICP‐AES. Mesoporosity, mesostructure and nanosize can be controlled simply by microwave irradiation time and temperature. Pyridine‐IR result reveals the coexistence of Lewis and Brönstead acid sites in these nanosize GaMMS while NH3‐TPD profiles suggest nanosize one has stronger acid site and contains more acid sites than the conventional one. Catalytic performance was evaluated using the catalytic cumene cracking test. The result indicates that the nanosize GaMMS shows a much higher activity than that of conventional GaMCM‐41, probably due to higher concentrations of H‐form sites, external surface and fast diffusion.
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