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以硝酸镍为金属源,在柠檬酸辅助下通过直接热分解法制备了高比表面积介孔氧化镍催化剂,采用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、程序升温还原(TPR)和N2吸-脱附技术表征了催化剂的物化性质,考察了氧化甲苯的性能.结果表明,所制备介孔NiO催化剂是具有虫孔状介孔结构的球形粒子,其中以原料等摩尔比混合经400℃灼烧得到的meso-Ni-1-400催化剂的比表面积最大,达到225 m~2 g(-1),平均孔径为5.9 nm,孔容为0.36 cm~3 g~(-1),介孔氧化镍催化剂具有高比表面积、优良的低温还原性能和多种Ni物种并存,使其氧化甲苯的活性好.
Using nickel nitrate as the metal source, mesoporous nickel oxide catalysts with high specific surface area were prepared by direct thermal decomposition with the aid of citric acid. XRD, TEM, SEM, TPR and N2 adsorption-desorption techniques were used to characterize the physico-chemical properties of the catalysts and the properties of toluene oxide were investigated. The results show that the prepared mesoporous NiO catalysts are spherical particles with pore-like mesopores, The specific surface area of meso-Ni-1-400 catalyst calcined at 400 ℃ is 225 m ~ 2 g (-1) with an average pore diameter of 5.9 nm and a pore volume of 0.36 cm ~ 3 g ~ (-1). The mesoporous nickel oxide catalyst has high specific surface area, excellent low temperature reduction performance and the coexistence of a variety of Ni species to make it have good activity for the oxidation of toluene.