第34卷，第11期 2014年11
光谱学与光谱分析 Spectroscopy and Spectral Analysis
Vol. 34 ,No. 1l -pp2961-2967
November,2014
FTIR Study of Hydrogen Bonds in Coal under
DropWeight ImpactTesting
LI Cheng-wu',WANG Jin-gui',XIE Bei-jing',DONG Li-hui', SUN Ying-feng',CAO Xu
1 . School of Resource and Safety Engineering , China University of Mining and Technology (Beijing), Beijing 100083 , China 2 . Institute of High Energy Phy sics Chinese Academy of Sciences, Beijing100049, China
Abstract There are many hydrogen bonds in coal , which affect the chemical structure and properties of coal. FTIR has been applied to the characterization study of the hydrogen bonds of Dongpang coals , which were un-der drop weight impact . There exists five kinds of hydrogen bonds in the coal : free OH groups , OH-.- , OH...OH , cyclic OH tetramers and OH-.N . Absorption strength of intermolecular hydrogen bonds markedly de clined after impact . Free O H groups mechanical-pow er chemical reacted in drop weight impact testing - The in-frared spectrum were curve-resolved into their component bands . The absorption strength of various hydrogen bonds decreased with the increase of impact energy , but the trend was slowing . By statistical relationship be-tween then , we find then complying with power function relationship . By comparing the exponents of fitted e quations , we concluded that failure sensitivity sequence of hydrogen bonds to the impact : free OH groups >cy-clic OH tetramers.>OH...N>OH..元>OH...OH.
KeywordsCoals ; Drop weight impact ; Hydrogen bonds ; FTIR
中图分类号：0657.3
Introducation
文献标识码：A
DI: 10, 3964/i. issn. 1000-0593(2014)11-2961-07
drogen bonds of coal are important to the swelling[5.5] and py-rolysis7-01 . Therefore, it is important to study the hydrogen bonds in coal for effective utilization of coal and better under
Coal is a heterogeneous polymer formed from a cross-linked molecular network of organic components . The struc-ture of coals has been extensively studied . Host-guest model and associated model were the two widely accepted structural models of coal . They considered the influence of non-covalent bonds such as hydrogen bonds , van der waals forces on the structure and properties of coal . Larsen.2] estimated that the number of hydrogen bonds more than covalent bonds by four . The brittleness and rock properties of coal were related to hy drogen bonds . Brenners] thought the glassy properties and high Tg of coal were related to hydrogen bonds . Miura[?] pointed out that the conversion increased with the suppressing of hydrogen bonds when coal was preheated. Moreover, hy-
Received : 2014-06-23 ; accepted : 2014-08-22
standing of its structure.
Up to now , researches applied several methods such as dfferential seanning calorimetry (DSC ).2) , solvent swell-ing(13.4], infra-red speetroscopy (IR).a] to study hydrogen bonds in coal . IR is the most widely applied method . Because it has many unique advantages[] . Firstly , IR is the vibra-tion-rotation spectrum , which is sensitive to the change and formation of the hydrogen bond. We can judge the type and strength of hydrogen bond by IR . Secondly , the role of a hy drogen atom in hydrogen bond can be determined by IR. Thirdly , the quantitative research of hydrogen bonds can be realized by IR . IR w as applied in the research of intermolecu-lar hydrogen bonds in coal , which can be roughly divided into
Foundation item: National Natural Science Foundation of China (51274206 , 51404277) , Fundamental Research Funds for the Central U niversi-
ties of Ministry of Education of China(2014QZ05 )
Biography : XIE Bei-jing , (1984—), a Lecturer at China University of Mining and Technology (Beijing )
Corresponding author
e-mail : bjxie1984@ 163 .com
e-mail : lewcacumtb -edu .en