文献类型：期刊文献

英文题名：Sulfated graphene as an efficient solid catalyst for acid-catalyzed liquid reactions

作者：Liu, Fujian[2];Sun, Jing[3];Zhu, Longfeng[3];Meng, Xiangju[1];Qi, Chenze[2];Xiao, Feng-Shou[1]

机构：[1]Zhejiang Univ, Dept Chem, Hangzhou 310028, Peoples R China;[2]Shaoxing Univ, Inst Appl Chem, Shaoxing 312000, Peoples R China;[3]Jilin Univ, Dept Chem, Changchun 130012, Peoples R China

年份：2012

卷号：22

期号：12

起止页码：5495

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000300838100034)、、EI(收录号：20121014832967)、Scopus(收录号：2-s2.0-84863229976)、WOS

基金：This work is supported by the State Basic Research Project of China (2009CB623507) and the National Natural Science Foundation of China (20973079 and U1162201).

语种：英文

外文关键词：Acetic acid - Catalysis - Catalysts - Esters - Mass transfer - pH - Reduced Graphene Oxide - Silica - Titration

外文摘要：Graphene with its two-dimensional sheet of sp(2)-hybridized carbon is a hot topic in the fields of materials and chemistry due to its unique features. Herein, we demonstrate that sulfated graphene is an efficient solid catalyst for acid-catalyzed liquid reactions. The sulfated graphene was synthesized from a facile hydrothermal sulfonation of reduced graphene oxide with fuming sulfuric acid at 180 degrees C. Combined characterizations of XRD, Raman, and AFM techniques show that G-SO3H has a sheet structure (1-4 layers). IR spectroscopy shows that G-SO3H has a S=O bond, and the XPS technique confirms the presence of an S element in G-SO3H. Acid-base titration indicates that the acidic concentration of sulfonic groups in the sulfated graphene is 1.2 mmol g(-1). TG curves shows that the decomposition temperature (268 degrees C) of the sulfonic groups on the sulfated graphene is much higher than that of conventional SO3H-functionalized ordered mesoporous carbon (237 degrees C). Catalytic tests of the esterification of acetic acid with cyclohexanol, the esterification of acetic acid with 1-butanol, the Peckmann reaction of resorcinol with ethyl acetoacetate, and the hydration of propylene oxide show that sulfated graphene is much more active than the conventional solid acid catalysts of Amberlyst 15, OMC-SO3H, SO3H-functionalized ordered mesoporous silica (SBA-15-SO3H), graphene oxide, and reduced graphene oxide, which is attributed to the fact that the sulfated graphene almost has no limitation of mass transfer due to its unique sheet structure. Very importantly, the sulfated graphene has extraordinary recyclability in these reactions, which is attributed to the stable sulfonic groups on the sulfated graphene. The advantages, including high activities and good recyclability as well as simple preparation, are potentially important for industrial applications of the sulfated graphene as an efficient heterogeneous solid acid catalyst in the future.