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High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix

Municipal solid-waste incineration leads to emission of lead (Pb) and cadmium (Cd), which vaporize in furnace and condense in flue. NaCl in waste has been proven to enhance volatilization of Pb and Cd at high temperatures via chlorination of oxides to chlorides; however, this process was not well-un...

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Autores principales: Wang, Xinye, Xie, Hao, Du, Rong, Liu, Yuying, Lin, Pingfang, Zhang, Jubing, Bu, Changsheng, Huang, Yaji, Zhang, Wen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9086868/
https://www.ncbi.nlm.nih.gov/pubmed/35548648
http://dx.doi.org/10.1039/c8ra06255b
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author Wang, Xinye
Xie, Hao
Du, Rong
Liu, Yuying
Lin, Pingfang
Zhang, Jubing
Bu, Changsheng
Huang, Yaji
Zhang, Wen
author_facet Wang, Xinye
Xie, Hao
Du, Rong
Liu, Yuying
Lin, Pingfang
Zhang, Jubing
Bu, Changsheng
Huang, Yaji
Zhang, Wen
author_sort Wang, Xinye
collection PubMed
description Municipal solid-waste incineration leads to emission of lead (Pb) and cadmium (Cd), which vaporize in furnace and condense in flue. NaCl in waste has been proven to enhance volatilization of Pb and Cd at high temperatures via chlorination of oxides to chlorides; however, this process was not well-understood so far due to its complexity. This study decoupled the indirect chlorination process and direct chlorination process so that these two processes were investigated separately. A horizontal tube furnace was used to heat the mixtures of NaCl and Si/Al matrix for indirect chlorination and the mixtures of NaCl, PbO/CdO and Si/Al matrix for direct chlorination. A set of dynamic sampling devices was designed and used to obtain dynamic data during temperature rising. The indirect chlorination process was initiated above 800 °C in O(2) + H(2)O atmosphere and O(2) atmosphere and above 1000 °C in N(2) atmosphere. Al(2)O(3) exhibited higher activity than SiO(2) to react with NaCl, releasing HCl or Cl(2). In the Cl release reaction, NaCl was in the gas phase. The direct chlorination process was initiated at 650–700 °C when the Si/Al matrix contained SiO(2) only and at around 800 °C when the Si/Al matrix contained Al(2)O(3) only or both SiO(2) and Al(2)O(3). SiO(2) exhibited higher activity than Al(2)O(3) in direct chlorination. The pre-reaction between PbO/CdO and Si/Al matrices was considered as the necessary condition for direct chlorination. During chlorination in O(2) + H(2)O atmosphere, indirect chlorination and direct chlorination occurred simultaneously, and the latter dominated the volatilization of Pb and Cd.
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spelling pubmed-90868682022-05-10 High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix Wang, Xinye Xie, Hao Du, Rong Liu, Yuying Lin, Pingfang Zhang, Jubing Bu, Changsheng Huang, Yaji Zhang, Wen RSC Adv Chemistry Municipal solid-waste incineration leads to emission of lead (Pb) and cadmium (Cd), which vaporize in furnace and condense in flue. NaCl in waste has been proven to enhance volatilization of Pb and Cd at high temperatures via chlorination of oxides to chlorides; however, this process was not well-understood so far due to its complexity. This study decoupled the indirect chlorination process and direct chlorination process so that these two processes were investigated separately. A horizontal tube furnace was used to heat the mixtures of NaCl and Si/Al matrix for indirect chlorination and the mixtures of NaCl, PbO/CdO and Si/Al matrix for direct chlorination. A set of dynamic sampling devices was designed and used to obtain dynamic data during temperature rising. The indirect chlorination process was initiated above 800 °C in O(2) + H(2)O atmosphere and O(2) atmosphere and above 1000 °C in N(2) atmosphere. Al(2)O(3) exhibited higher activity than SiO(2) to react with NaCl, releasing HCl or Cl(2). In the Cl release reaction, NaCl was in the gas phase. The direct chlorination process was initiated at 650–700 °C when the Si/Al matrix contained SiO(2) only and at around 800 °C when the Si/Al matrix contained Al(2)O(3) only or both SiO(2) and Al(2)O(3). SiO(2) exhibited higher activity than Al(2)O(3) in direct chlorination. The pre-reaction between PbO/CdO and Si/Al matrices was considered as the necessary condition for direct chlorination. During chlorination in O(2) + H(2)O atmosphere, indirect chlorination and direct chlorination occurred simultaneously, and the latter dominated the volatilization of Pb and Cd. The Royal Society of Chemistry 2018-10-08 /pmc/articles/PMC9086868/ /pubmed/35548648 http://dx.doi.org/10.1039/c8ra06255b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Wang, Xinye
Xie, Hao
Du, Rong
Liu, Yuying
Lin, Pingfang
Zhang, Jubing
Bu, Changsheng
Huang, Yaji
Zhang, Wen
High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title_full High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title_fullStr High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title_full_unstemmed High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title_short High-temperature chlorination of PbO and CdO induced by interaction with NaCl and Si/Al matrix
title_sort high-temperature chlorination of pbo and cdo induced by interaction with nacl and si/al matrix
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9086868/
https://www.ncbi.nlm.nih.gov/pubmed/35548648
http://dx.doi.org/10.1039/c8ra06255b
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