THE USE OF MAGNETIC-RESONANCE PARAMETERS IN THE CHARACTERIZATION OF PREMIUM COALS AND OTHER COALS OF VARIOUS RANK

被引：26
|
作者：
JURKIEWICZ, A
WIND, RA
MACIEL, GE
机构：
[1] Department of Chemistry, Colorado State University, Fort Collins
来源：
FUEL | 1990年 / 69卷 / 07期
关键词：
electron spin resonance; n.m.r; nuclear polarization;
D O I：
10.1016/0016-2361(90)90226-G
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Eight premium coals and twelve Polish coals were investigated by means of e.s.r., 1H n.m.r., 13C CP-n.m.r. and dynamic nuclear polarization (DNP). The following parameters were studied: the concentration of free radicals, Ne; the 1H Zeeman relaxation rate, WZH; the 1H rotating-frame relaxation rate, WρH; the 1H DNP enhancement factor, PH; and the CP-determined carbon aromaticity, (fa)CP. The results generally agree with the patterns established in an earlier study of the same parameters of 60 other coals. The following relationships have been found between the above parameters and parameters obtained via proximate and ultimate analyses: Ne versus percentage volatile matter, WZH versus oxygen content, WρH versus Ne, PH versus carbon content and (fa)CP versus percentage volatile matter. For the premium coals it was observed that exposure to air prior to degassing resulted in irreversible changes in Ne, WZH and PH. © 1990.
引用
收藏
页码：830 / 833
页数：4
相关论文
共 50 条
  • [31] DIFFUSION OF NITROGEN + CARBON DIOXIDE FROM COALS OF VARIOUS RANK
    NANDI, SP
    WALKER, PL
    FUEL, 1964, 43 (05) : 385 - &
  • [32] Characterization of low rank alpine coals: Thermogravimetric studies
    Vijayakumar, CT
    Vinayagamoorthi, S
    Fink, JK
    Sivasamy, P
    JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, 2006, 76 (1-2) : 191 - 197
  • [33] Characterization of hydrothermally dried low-rank coals
    D. E. Walsh
    P. D. Rao
    H. Owens
    J. R. Mokka
    O. Noirot
    Mining, Metallurgy & Exploration, 1999, 16 : 48 - 56
  • [34] THE CHARACTERIZATION OF ORGANOMINERAL COMPONENTS OF LOW-RANK COALS
    MARTINEZTARAZONA, MR
    PALACIOS, JM
    MARTINEZALONSO, A
    TASCON, JMD
    FUEL PROCESSING TECHNOLOGY, 1990, 25 (01) : 81 - 87
  • [35] Characterization of low rank alpine coals: Thermogravimetric studies
    Vijayakumar, C.T.
    Vinayagamoorthi, S.
    Fink, J.K.
    Sivasamy, P.
    Journal of Analytical and Applied Pyrolysis, 2006, 76 (1-2): : 191 - 197
  • [36] Characterization of hydrothermally dried low-rank coals
    Walsh, DE
    Rao, PD
    Owens, H
    Mokka, JR
    Noirot, O
    MINERALS & METALLURGICAL PROCESSING, 1999, 16 (01) : 48 - 56
  • [37] REDOX POTENTIAL CURVES FOR CHARACTERIZATION OF COALS AS A RANK PARAMETER
    MILLEY, J
    FUEL, 1988, 67 (01) : 143 - 144
  • [38] On the use of low-rank coals in electricity generation
    Jones, J. C.
    FUEL, 2010, 89 (11) : 3608 - 3608
  • [39] The use of ultrasonic wave propagation parameters in the characterization of extracts from coals
    Krzesinska, M
    FUEL, 1998, 77 (06) : 649 - 653
  • [40] The use of ultrasonic wave propagation parameters in the characterization of extracts from coals
    Institute of Coal Chemistry, Polish Academy of Sciences, Sowińskiego 5, 44-100 Gliwice, Poland
    Fuel, 6 (649-653):
12345