Open AccessSurface properties of photo-oxidized bituminous coals. Technical progress report, January 1995--March 1995
Author(s) -
Gareth D. Mitchell,
Alan Davis,
Subhash Chander
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/95525
Subject(s) - vitrinite , xanes , adsorption , pyrolysis , coal , x ray photoelectron spectroscopy , materials science , bituminous coal , irradiation , spectroscopy , analytical chemistry (journal) , chemistry , chemical engineering , environmental chemistry , organic chemistry , engineering , physics , quantum mechanics , nuclear physics
During this report period, vitrinite concentrate samples were prepared from the Illinois No. 6 (DECS-24) and Lower Kittanning (PSOC-1562) seam samples that were collected last year. Some of the analytical information on these concentrates are provided. In addition, preparation of a surface-oxidized powdered vitrinite concentrate of the Pittsburgh seam (DECS-23) sample for microflotation experiments and pyrolysis GC/MS was initiated following development of a procedure for the irradiation sequence for this sample. Our collaborative efforts with Dr. Pigram of the University of New South Wales and Dr. Cody of Argonne National Laboratory have continued. As a result of problems in relocating the irradiated areas prepared for Scanning Ion Mass Spectroscopy (SIMS), a new sample preparation technique was developed. This procedure involves the use of a finder grid that is attached to the coal surface allowing Dr. Pigram`s group to positively identify the affected area. A new ultrathinned section of the medium volatile Sewell seam (DECS-13) was prepared for Scanning Transmission X-ray Microscopy (STXM) and analyzed. Preliminary findings suggest the changes in oxygen functionality on the irradiated surfaces (1, 5 and 10 mins) of this coal compare well with that previously reported for the subbituminous Wyodak and high volatile Pittsburgh seam discussed in the last quarterly report. Kinetic data from evaluation of carbon near-edge x-ray adsorption fluorescence spectroscopy (C-NEXAFS) has yet to be completed