Decomposition of potent greenhouse gas sulfur hexafluoride (SF6) by kirschsteinite-dominant stainless steel slag

Zhang, Jia, Zhou, Ji Zhi, Xu, Zhi Ping, Li, Yajun, Cao, Tiehua, Zhao, Jun, Ruan, Xiuxiu, Liu, Qiang and Qian, Guangren (2014) Decomposition of potent greenhouse gas sulfur hexafluoride (SF6) by kirschsteinite-dominant stainless steel slag. Environmental Science and Technology, 48 1: 599-606. doi:10.1021/es403884e


Author Zhang, Jia
Zhou, Ji Zhi
Xu, Zhi Ping
Li, Yajun
Cao, Tiehua
Zhao, Jun
Ruan, Xiuxiu
Liu, Qiang
Qian, Guangren
Title Decomposition of potent greenhouse gas sulfur hexafluoride (SF6) by kirschsteinite-dominant stainless steel slag
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2014-01-07
Year available 2013
Sub-type Article (original research)
DOI 10.1021/es403884e
Open Access Status Not Open Access
Volume 48
Issue 1
Start page 599
End page 606
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
Abstract In this investigation, kirschsteinite-dominant stainless steel slag (SSS) has been found to decompose sulfur hexafluoride (SF6) with the activity higher than pure metal oxides, such as Fe2O3 and CaO. SSS is mainly made up of CaO·FeO·SiO2(CFS)/ MgO·FeO·MnO(RO) phase conglomeration. The SF6 decomposition reaction with SSS at 500-700 C generated solid MF 2/MF3 and gaseous SiF4, SO2/SO 3 as well as HF. When 10 wt % of SSS was replaced by Fe 2O3 or CaO, the SF6 decomposition amount decreased from 21.0 to 15.2 or 15.0 mg/g at 600 C. The advantage of SSS over Fe2O3 or CaO in the SF6 decomposition is related to its own special microstructure and composition. The dispersion of each oxide component in SSS reduces the sintering of freshly formed MF 2/MF3, which is severe in the case of pure metal oxides and inhibits the continuous reaction of inner components. Moreover, SiO 2 in SSS reacts with SF6 and evolves as gaseous SiF 4, which leaves SSS with voids and consequently exposes inner oxides for further reactions. In addition, we have found that oxygen significantly inhibited the SF6 decomposition with SSS while H2O did not, which could be explained in terms of reaction pathways. This research thus demonstrates that waste material SSS could be potentially an effective removal reagent of greenhouse gas SF6.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 11 December 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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