Speciation of chromium in swarf during pyrolysis

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题名:	Speciation of chromium in swarf during pyrolysis
作者:	Huang, H.-L., Wang, H.P., Wei, Y.-L., Jou, C.J.G., Lu, W.-C., Chang, J.I.C.
贡献者:	Department of Environmental Science and Engineering, Tunghai University
关键词:	Cr;EXAFS;Swarf;XANES
日期:	2006-11
上传时间:	2013-05-15T09:03:18Z (UTC)
摘要:	Speciation of chromium in swarf wastes pyrolyzed at 673-873 K has been studied by X-ray absorption spectroscopy in the present work. The least-square fitted X-ray absorption near edge structural (XANES) spectrum shows that Cr 3C 2 (84%) was the main chromium species in the untreated swarf. A small amount of CrO 3 and Cr 2O 3 was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr 2O 4 (24%) were formed with disappearance of about 43% of Cr 3C 2 in the swarf. By extended X-ray absorption fine structural (EXAFS) spectroscopy, we found that metallic Cr (with Cr{single bond}Cr bond distances of 2.56-2.59 ?) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr 3C 2 to metallic Cr and (2) formation of FeCr 2O 4 via reactions of chromium oxides and iron oxides. ? 2006 Elsevier Ltd. All rights reserved.
關聯:	Radiation Physics and Chemistry 75 (11 SPEC. ISS.) , pp. 2039-2041
显示于类别:	[環境科學與工程學系所] 期刊論文

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