Speciation of chromium in swarf during pyrolysis

Hsin Liang Huang; H. Paul Wang; Yu Ling Wei; C. J.G. Jou; Wen Chung Lu; James I.C. Chang

doi:10.1016/j.radphyschem.2005.10.039

Speciation of chromium in swarf during pyrolysis

Hsin Liang Huang, H. Paul Wang, Yu Ling Wei, C. J.G. Jou, Wen Chung Lu, James I.C. Chang

環境工程學系

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1 引文斯高帕斯（Scopus）

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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 Cr₃C₂ (84%) was the main chromium species in the untreated swarf. A small amount of CrO₃ and Cr₂O₃ was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr₂O₄ (24%) were formed with disappearance of about 43% of Cr₃C₂ 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 Å) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr₃C₂ to metallic Cr and (2) formation of FeCr₂O₄ via reactions of chromium oxides and iron oxides.

原文	English
頁（從 - 到）	2039-2041
頁數	3
期刊	Radiation Physics and Chemistry
卷	75
發行號	11 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.radphyschem.2005.10.039
出版狀態	Published - 2006 11月

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@article{d39361de030546c1954dfc212ab85b88,

title = "Speciation of chromium in swarf during pyrolysis",

abstract = "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 Cr3C2 (84%) was the main chromium species in the untreated swarf. A small amount of CrO3 and Cr2O3 was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr2O4 (24%) were formed with disappearance of about 43% of Cr3C2 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 {\AA}) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr3C2 to metallic Cr and (2) formation of FeCr2O4 via reactions of chromium oxides and iron oxides.",

author = "Huang, {Hsin Liang} and Wang, {H. Paul} and Wei, {Yu Ling} and Jou, {C. J.G.} and Lu, {Wen Chung} and Chang, {James I.C.}",

note = "Funding Information: The financial support of the National Science Council and the Taiwan NSRRC are gratefully acknowledged. We also thank Dr. Y. W. Yang and Dr. Jyh-Fu Lee of the NSRRC for their EXAFS experimental assistance.",

year = "2006",

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doi = "10.1016/j.radphyschem.2005.10.039",

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AU - Huang, Hsin Liang

AU - Wang, H. Paul

AU - Wei, Yu Ling

AU - Jou, C. J.G.

AU - Lu, Wen Chung

AU - Chang, James I.C.

N1 - Funding Information: The financial support of the National Science Council and the Taiwan NSRRC are gratefully acknowledged. We also thank Dr. Y. W. Yang and Dr. Jyh-Fu Lee of the NSRRC for their EXAFS experimental assistance.

PY - 2006/11

Y1 - 2006/11

N2 - 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 Cr3C2 (84%) was the main chromium species in the untreated swarf. A small amount of CrO3 and Cr2O3 was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr2O4 (24%) were formed with disappearance of about 43% of Cr3C2 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 Å) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr3C2 to metallic Cr and (2) formation of FeCr2O4 via reactions of chromium oxides and iron oxides.

AB - 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 Cr3C2 (84%) was the main chromium species in the untreated swarf. A small amount of CrO3 and Cr2O3 was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr2O4 (24%) were formed with disappearance of about 43% of Cr3C2 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 Å) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr3C2 to metallic Cr and (2) formation of FeCr2O4 via reactions of chromium oxides and iron oxides.

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JO - Radiation Physics and Chemistry

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ER -

Speciation of chromium in swarf during pyrolysis

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