Abstract
Hierarchically macro/mesoporous alumina monoliths were successfully fabricated from a facile sol–gel process by introducing PEG8000 to the reaction solution of ordered mesoporous Al2O3 (OMA, P123/isopropoxide aluminum/HNO3). The monolithic gels were subsequently calcined at different temperatures to investigate the morphological evolution. Monolithic skeletons were obtained in the dried gels with bimodal close-celled macropores. The bimodal macroporous structure is preserved after calcination at 450°C. The macropores are interconnected with large-sized mesopores, which facilitates the monolith with high surface area of 286.9m2/g and pore volume of 0.67cm3/g. This hierarchical feature persists up to 1100°C after phase-transformation from γ-Al2O3 to α-Al2O3 with the shrinkage of macropores and expansion of mesopores.
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