title: Preparation of mesoporous carbon from commercial activated carbon with steam activation in the presence of cerium oxide.
abstract: Mesoporous carbon was prepared from the commercial activated carbon by steam activation with cerium oxide as catalyst. Steam activation with a catalyst loading of 0.5-2.0 wt% at 680-870 degrees C was examined. The surface area and pore size were evaluated by nitrogen adsorption at 77 K, and the structure of cerium oxide was characterized by XRD, XPS, and TEM. The results showed that the catalyst promoted the development of a mesopore at lower temperature (680-740 degrees C), and the mesopore was concentrated around 4-10 nm. The noncatalytic activation was advantageous in mesopore development and the catalyst would restrict the formation of mesopores at high temperature (800-870 degrees C). Higher loading of cerium oxide and higher activation temperature caused the aggregation of cerium oxide and then resulted in scattered pore size distribution.
authors.affiliation: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, People's Republic of China. shenwzh2000@yahoo.com
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Shen
authors.forename: Jingtang
authors.initials: J
authors.lastname: Zheng
authors.forename: Zhangfeng
authors.initials: Z
authors.lastname: Qin
authors.forename: Jianguo
authors.initials: J
authors.lastname: Wang