Ding, Ziyi1,2; Zhu, Runliang1,2; Xie, Qingru1,2; Long, Shiqin1,2; Fu, Haoyang3; Chen, Qingze1,2; Xi, Yunfei4
Effects of iron oxide minerals on the pyrolysis of polyvinyl chloride: Catalytic dechlorination, chlorine capture, and carbon sequestration
刊名JOURNAL OF CLEANER PRODUCTION
ISSN号0959-6526
2024-12-10
卷号483页码:12
DOI10.1016/j.jclepro.2024.144283
语种英语
WOS研究方向Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
摘要To reduce the risk of organochlorine contamination during the pyrolysis of chlorine-containing plastics, catalytic pyrolytic dechlorination of polyvinyl chloride (PVC) by iron oxides is a promising strategy. However, differences in the structural properties of various iron oxides mineral phases may lead to different catalysis activity. In this study, various characterization methods and theoretical calculations were integrated to reveal the effects of ferrihydrite (Fhy) and hematite (Hem) on the pyrolysis characteristics of PVC at 400-800 degrees C. Both Fhy and Hem lower the dechlorination temperature of PVC, consequently retarding the degradation of dechlorination intermediates and mitigating the emission of volatile compounds. Fhy and Hem reduced the release of chlorinated hydrocarbons and immobilized chlorine as Rokuhnite. Specifically, the yield of HCl at 400 degrees C decreased from 88.8% for pure PVC to 29.9%/55.8% with the additions of 30% Fhy/Hem. The surface catalytic activity of Hem is stronger than that of Fhy, resulting in better catalytic dechlorination; while Fhy has a larger specific surface area (more adsorption sites), which leads to better chlorine fixation. Fhy and Hem also facilitated the dehydroaromatisation reaction of dechlorinated PVC, increasing the residual carbon yield at 400 degrees C from 45.5% to 65.4% and to 75.8%, respectively. Preferably from the perspective of pollutant emission, Fhy with large specific surface area and weak crystallinity can adsorb more HCl and catalyze dechlorination as well, so the addition of Fhy (>30%) to PVC pyrolysis process can be beneficial to the control of pollutant emission and carbon sequestration.
关键词Ferrihydrite Hematite Polyvinyl chloride Catalytic pyrolysis Dechlorination
WOS记录号WOS:001374714700001
收录类别SCI
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.gig.ac.cn/handle/344008/81903
专题中国科学院矿物学与成矿学重点实验室
通讯作者Zhu, Runliang; Xi, Yunfei
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore
4.Queensland Univ Technol, Fac Sci, Sch Chem & Phys, Brisbane, Qld 4001, Australia
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GB/T 7714
Ding, Ziyi,Zhu, Runliang,Xie, Qingru,et al. Effects of iron oxide minerals on the pyrolysis of polyvinyl chloride: Catalytic dechlorination, chlorine capture, and carbon sequestration[J]. JOURNAL OF CLEANER PRODUCTION,2024,483:12.
APA Ding, Ziyi.,Zhu, Runliang.,Xie, Qingru.,Long, Shiqin.,Fu, Haoyang.,...&Xi, Yunfei.(2024).Effects of iron oxide minerals on the pyrolysis of polyvinyl chloride: Catalytic dechlorination, chlorine capture, and carbon sequestration.JOURNAL OF CLEANER PRODUCTION,483,12.
MLA Ding, Ziyi,et al."Effects of iron oxide minerals on the pyrolysis of polyvinyl chloride: Catalytic dechlorination, chlorine capture, and carbon sequestration".JOURNAL OF CLEANER PRODUCTION 483(2024):12.
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