Journal
RSC ADVANCES
Volume 5, Issue 114, Pages 93917-93925Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra12111f
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Funding
- Natural Science Foundation of Fujian province [2104J01032]
- National High-tech R&D Program of China (863 Program) [2015AA03A402]
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High thermal stability nanocrystalline spherical mesoporous alumina (NSMA) and ordered mesoporous alumina (OMA) were synthesized in an acetic acid assisted sol-gel system by adjusting the mole ratio of n(acetic acid)/n(Al) and synthesis temperature to control the competition between the colloidal surface free energy (F) and the free energy of mesostructure self-assembly (Delta G). When F was dominant, with the mole ratio of n(acetic acid)/n(Al) set as 0.05-0.15 and the formation and aging temperature of the precursor solution set at 30 degrees C, the obtained alumina displayed a spherical morphology, and the nanocrystalline spherical mesoporous alumina dispersed well even when the calcination temperature increased up to 1100 degrees C; however, ordered mesoporous alumina was obtained with the increasing influence of Delta G when the mole ratio of n(acetic acid)/n(Al) was set as 0.10 and the lower formation and aging temperature set at 20 degrees C, and it retained a certain ordered structure with the specific surface area of 125 m(2) g(-1) even when the calcination temperature increased up to 1000 degrees C, which indicate the excellent thermal stability of its pore structure. Taking the as-synthesized aluminas as carriers, Pd-supported catalysts were obtained and their catalytic activity for CO and C3H6 oxidation was significantly improved compared to commercial alumina.
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