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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Veröffentlicht in:Catalysts 2019-09, Vol.9 (9), p.733
Hauptverfasser: Liu, Sichen, Martin-Martinez, María, Álvarez-Montero, María Ariadna, Arevalo-Bastante, Alejandra, Rodriguez, Juan José, Gómez-Sainero, Luisa María
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container_end_page
container_issue 9
container_start_page 733
container_title Catalysts
container_volume 9
creator Liu, Sichen
Martin-Martinez, María
Álvarez-Montero, María Ariadna
Arevalo-Bastante, Alejandra
Rodriguez, Juan José
Gómez-Sainero, Luisa María
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 PdCx 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.
doi_str_mv 10.3390/catal9090733
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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 PdCx 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. 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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute
subjects Adsorption
Air flow
Catalysts
Catalytic activity
Chemical reactions
Deactivation
Dichloromethane
Dioxins
Experiments
Gas streams
Gases
Hydrocarbons
Hydrodechlorination
Oxidation
Phosgene
Poisoning
Pollutants
Regeneration
Spacetime
Valence
Vapor phases
title Recycling of Gas Phase Residual Dichloromethane by Hydrodechlorination: Regeneration of Deactivated Pd/C Catalysts
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