The continuous absorption spectra for gaseous Cl2, Br2, BrCl, IC1, and IBr between 220 and 600 µ are reported. The experimental data have been fitted to theoretical curves of the type suggested by Sulzer and Wieland. The parameters for these curves are given.
aggregation of iron atoms occurred more easily over bituminous coals than brown coals even at the same loading. This is because brown coals have more surface functional groups that can interact with iron species. Conclusions The use of Mossbauer and EXAFS techniques was demonstrated to be quite effective in revealing the type of iron species formed during pyrolysis of Fe(N03)3-loaded brown coal in an inert atmosphere. The main species observed at low temperatures was highly dispersed FeO-OH. At higher temperatures, reduced species, like 7-Fe, a-Fe, and Fe3C, became predominant.The change of chemical forms of iron species during heat treatment was affected not only by temperature but also (30) Yamashita, H.; Tomita, A. Unpublished data. by iron loading. The aggregation and reduction of iron species were rather slow in the low-loading samples.(62603014), is acknowledged. Coal Corporation of Victoria, Australia, kindly supplied the raw brown coal. The X-ray absorption experiments were performed under the approval of the Photon Factory Program Advisory Committee (87-139). We thank Dr. M. Nomura of KEK-PF for his advice in measuring EXAFS spectra. Thanks are due to Dr. A. Kunii of the Faculty of Science and the staff of the Cyclotron and Radioisotope Center at Tohoku University for Mossbauer spectroscopy measurements.
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