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

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

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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 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.

Original language	English
Pages (from-to)	2039-2041
Number of pages	3
Journal	Radiation Physics and Chemistry
Volume	75
Issue number	11 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.radphyschem.2005.10.039
Publication status	Published - 2006 Nov

All Science Journal Classification (ASJC) codes

Radiation

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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",

month = nov,

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

language = "English",

volume = "75",

pages = "2039--2041",

journal = "Radiation Physics and Chemistry",

issn = "0969-806X",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Speciation of chromium in swarf during pyrolysis

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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U2 - 10.1016/j.radphyschem.2005.10.039

DO - 10.1016/j.radphyschem.2005.10.039

M3 - Article

AN - SCOPUS:33750185313

SN - 0969-806X

VL - 75

SP - 2039

EP - 2041

JO - Radiation Physics and Chemistry

JF - Radiation Physics and Chemistry

IS - 11 SPEC. ISS.

ER -

Speciation of chromium in swarf during pyrolysis

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