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A mesoporous aluminosilicate prepared by simply coating fibrous γ-AlOOH on the external surface of SBA-15 for catalytic hydrocarbon cracking

Shi, Zongbo, Guan, Yejun, Wu, Peng, He, Mingyuan
RSC advances 2016 v.6 no.46 pp. 40296-40303
X-ray diffraction, acidity, active sites, adsorption, aluminum, aluminum oxide, ammonia, boehmite, catalytic activity, coatings, cracking, desorption, ethanol, infrared spectroscopy, mixing, nitrogen, nuclear magnetic resonance spectroscopy, porous media, scanning electron microscopy, silicon, steaming, temperature
A binary SiO₂/Al₂O₃ composite with fibrous γ-alumina coating on the external surface of SBA-15 has been synthesized by simply mixing SBA-15 with fibrous boehmite sol, followed by aging and calcination. The textural and acidic properties of the resultant material were characterized by various techniques, i.e. powder X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared (IR) spectroscopy, N₂ adsorption/desorption, nuclear magnetic resonance (NMR) spectroscopy, and temperature programmed desorption of ammonia and ethanol (NH₃-TPD and EtOH-TPD). Coating fibrous γ-alumina stabilized the SBA-15 structure against collapse under critical steaming conditions (800 °C and 4 h) allowing for the facile synthesis of mesoporous aluminosilicate. The migration of aluminum and silicon between the alumina and SBA-15 zones led to the formation of Al–OH–Si with weak acidity which served as the active sites with excellent catalytic performance in the cracking of 1,3,5-triisopropyl benzene (TIPB).