From the curve a, b, c, we can find that there were a lot of small peaks situating in the range of 1600–1200 cm1, attributed to the glucose and polyvinyl pyrrolidone, which indicated that, the surfactants still attached to the surface of alumina when the calcination temperature reached to 800 C, A small adsorption peak located in 1040 cm1 in curve b, assigned to stretching vibration of C–O–C, which was due to the oxidation of glucose in the calcination