The cerium-metal-organic frameworks (Ce-MOFs),a precursor with different organic ligands,was synthesized by hydrothermal synthesis,and the CeO2 catalysts for catalytic oxidation of toluene were obtained by calcination at 400℃,and the properties of the catalyst were studied.The results showed that under the conditions of the reaction temperature of 180～260℃and the mass airspeed of 60000mL/(g·h),the order of activity of the catalysts was:CeO2-B>CeO2-M>CeO2-A(B,M and A were the initials of organic ligands 4,4′-bipyridine,2-methylimidazole,and 2-aminoterephthalic acid,respectively).CeO2-B achieved a toluene degradation rate of 92.9% at 215℃and maintained excellent catalytic performance in the 30h stability test.Its outstanding catalytic activity benefited from the large specific surface area (126.72m2/g),pore volume (0.19cm3/g),average pore size (5.44nm),the higher concentrations of Ce3+ (19.97%) and surface chemisorption oxygen Oads(43.63%).XRD,BET,SEM,H2-TPR,XPS and other characterizations proved that organic ligands affected the physical properties of catalysts such as specific surface area,pore volume,pore size and particle size.
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基金资助
国家自然科学基金(21006065)
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