Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts
Dichloromethane (DCM) is an important pollutant with very harmful effects on human health and the environment. Catalytic hydrodechlorination (HDC) is an environmentally friendly technology for its removal from gas streams; it avoids the formation of hazardous pollutants like dioxins and phosgene (pr...
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doaj-dc9435cff27c43109544b2d3619fbaf72020-11-25T02:45:29ZengMDPI AGCatalysts2073-43442019-08-019973310.3390/catal9090733catal9090733Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C CatalystsSichen Liu0María Martin-Martinez1María Ariadna Álvarez-Montero2Alejandra Arevalo-Bastante3Juan José Rodriguez4Luisa María Gómez-Sainero5Departamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDepartamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDepartamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDepartamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDepartamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDepartamento de Ingeniería Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, SpainDichloromethane (DCM) is an important pollutant with very harmful effects on human health and the environment. Catalytic hydrodechlorination (HDC) is an environmentally friendly technology for its removal from gas streams; it avoids the formation of hazardous pollutants like dioxins and phosgene (produced by other techniques), and the products obtained can be reused in other industries. When compared to other precious metals, Pd/C catalyst exhibited a better catalytic activity. However, the catalyst showed a significant deactivation during the reaction. In this study, the oxidation state and particle size of Pd was monitored with time on stream in order to elucidate the transformations that the catalyst undergoes during HDC. The deactivation can be ascribed to the formation of a new PdC<i><sub>x</sub></i> phase during the first hour of reaction. Carbon atoms incorporated to Pd lattice come from (chloro)-hydrocarbons adsorbed in the metallic species, whose transformation is promoted by the HCl originating in the reaction. Nevertheless, the catalyst was regenerated by air flow treatment at 250 °C, recovering the catalyst more than 80% of initial DCM conversion.https://www.mdpi.com/2073-4344/9/9/733palladiumactivated carbonhydrodechlorinationdeactivationregenerationpalladium carbide |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sichen Liu María Martin-Martinez María Ariadna Álvarez-Montero Alejandra Arevalo-Bastante Juan José Rodriguez Luisa María Gómez-Sainero |
spellingShingle |
Sichen Liu María Martin-Martinez María Ariadna Álvarez-Montero Alejandra Arevalo-Bastante Juan José Rodriguez Luisa María Gómez-Sainero Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts Catalysts palladium activated carbon hydrodechlorination deactivation regeneration palladium carbide |
author_facet |
Sichen Liu María Martin-Martinez María Ariadna Álvarez-Montero Alejandra Arevalo-Bastante Juan José Rodriguez Luisa María Gómez-Sainero |
author_sort |
Sichen Liu |
title |
Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts |
title_short |
Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts |
title_full |
Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts |
title_fullStr |
Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts |
title_full_unstemmed |
Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts |
title_sort |
recycling of gas phase residual dichloromethane by hydrodechlorination: regeneration of deactivated pd/c catalysts |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2019-08-01 |
description |
Dichloromethane (DCM) is an important pollutant with very harmful effects on human health and the environment. Catalytic hydrodechlorination (HDC) is an environmentally friendly technology for its removal from gas streams; it avoids the formation of hazardous pollutants like dioxins and phosgene (produced by other techniques), and the products obtained can be reused in other industries. When compared to other precious metals, Pd/C catalyst exhibited a better catalytic activity. However, the catalyst showed a significant deactivation during the reaction. In this study, the oxidation state and particle size of Pd was monitored with time on stream in order to elucidate the transformations that the catalyst undergoes during HDC. The deactivation can be ascribed to the formation of a new PdC<i><sub>x</sub></i> phase during the first hour of reaction. Carbon atoms incorporated to Pd lattice come from (chloro)-hydrocarbons adsorbed in the metallic species, whose transformation is promoted by the HCl originating in the reaction. Nevertheless, the catalyst was regenerated by air flow treatment at 250 °C, recovering the catalyst more than 80% of initial DCM conversion. |
topic |
palladium activated carbon hydrodechlorination deactivation regeneration palladium carbide |
url |
https://www.mdpi.com/2073-4344/9/9/733 |
work_keys_str_mv |
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