Deactivation and regeneration of activated carbon-supported Rh and Ru catalysts in the hydrodechlorination of chloromethanes into light olefins

Maria Martin-Martinez, Juan J. Rodriguez, Richard T. Baker, Luisa M. Gómez-Sainero

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This work analyses the deactivation of activated carbon-supported Rh and Ru (both at 1 wt%) catalysts (Rh/C and Ru/C) in the hydrodechlorination (HDC) of dichloromethane (DCM) and chloroform (TCM). The deactivation can be mainly attributed to the coverage of active metal centres by organometallic species resulting from the chemisorption of reaction products, such as olefins, at the electro-deficient metal sites. With DCM, the activity of Ru/C decreased by more than 80% after 90 h on stream at 250 °C and with a space time of 1.7 kg h mol−1. Under the same conditions, with TCM, the Rh/C and Ru/C catalysts lost 75% of activity after 84 and 54 h on stream, respectively. A regeneration treatment with air at 250 °C allowed complete recovery of the catalytic activity. After each deactivation-regeneration cycle, the selectivity to olefins increased. Therefore, HDC with the catalysts tested provides a promising way for the upgrading of chloromethanes from waste gas streams into light olefins.
Original languageEnglish
Article number125479
JournalChemical Engineering Journal
Volume397
Early online date16 May 2020
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Hydrodechlorination
  • Olefins
  • Rh/C
  • Ru/C
  • Deactivation
  • Regeneration

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