期刊
CARBON
卷 77, 期 -, 页码 1157-1167出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.06.059
关键词
-
资金
- Spanish Ministerio de Economia y Competitividad [CTQ2011-28124]
- Diputacion General de Aragon
- European Regional Development Funds
- European Commission (FP7, FREECATS) [280658]
Sulfonation of hydrothermal carbon leads to a very active acid catalyst, in spite of the very low surface area determined by N-2 physisorption and the even distribution of sulfonic groups, as demonstrated by scanning transmission electron microscopy analysis. However, CO2 adsorption at 273 K indicates the presence of ultramicropores, not detected with N-2 at 77 K. Acidity was characterized by different procedures, but the most relevant was P-31 solid state NMR of adsorbed triethylphosphine oxide. The solvent used for the adsorption is crucial, as the solid seems not to be acidic in hexane, but it shows acidic groups comparable to arylsulfonic ones when the adsorption takes place in methanol. This is probably due to the breakage of the network of hydrogen bonds that forms the ultramicropores, leading to an improved accessibility to the sites. This result is in agreement with the hydrophilicity of the solid, demonstrated by water adsorption. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据