尼亚尔
尖晶石
煅烧
铝酸盐
材料科学
镍
无机化学
金属
介孔材料
比表面积
化学
催化作用
冶金
有机化学
合金
水泥
金属间化合物
作者
C. Otero Areán,M. Peñarroya Mentruit,A. J. Lopez Lopez,J.B. Parra
标识
DOI:10.1016/s0927-7757(00)00590-2
摘要
The oxide spinel NiAl 2 O 4 and spinel-type solid solutions Al 2 O 3 –NiAl 2 O 4 (at Ni/Al=1:4, and Ni/Al=1:8) were prepared by controlled hydrolysis of mixed metal alkoxides, followed by calcination of the resulting gels. Powder X-ray diffraction showed that all samples prepared were single phase cubic materials having the spinel-type structure. The cubic lattice parameter, a o , was found to decrease gradually with increasing aluminium content of the mixed metal oxides. The specific surface area (determined by nitrogen adsorption at 77 K) was found to be in the range of 200–300 m 2 g −1 . The materials were found to be basically mesoporous, the most frequent pore radius being in the range 3.2–6.4 nm. IR spectroscopy of CO adsorbed at liquid nitrogen temperature gave a main band at 2186–2195 cm −1 , which was assigned to the CO stretching vibration of surface Al 3+ ⋯CO adducts where coordinatively unsaturated Al 3+ ions act as Lewis acid centres.
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