Hydrogen bromide in syngas: Effects on tar reforming, water gas-shift activities and sintering of Ni-based catalysts

[Display omitted] •Thermal treatment of waste containing brominated flame retardants forms HBr.•High concentrations of HBr poisoned catalytic activity of Ni-alumina catalyst.•HBr poisoning was more detrimental than HCl poisoning.•HBr poisoning was more detrimental in the presence of CO and CO2.•Nano...

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Published in:Applied catalysis. B, Environmental Environmental, 2021-01, Vol.280, p.119435, Article 119435
Main Authors: Binte Mohamed, Dara Khairunnisa, Veksha, Andrei, Lim, Teik-Thye, Lisak, Grzegorz
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysts
Catalytic activity
catalytic reforming
Coking
Deactivation
Depletion
Gasification
HBr poisoning
Hydrogen bromide
Municipal solid waste
Municipal waste management
naphthalene
nickel catalyst
Porosity
Reforming
sintering
Sintering (powder metallurgy)
Solid waste management
Structural analysis
Synthesis gas
Tar
Water gas
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Summary:[Display omitted] •Thermal treatment of waste containing brominated flame retardants forms HBr.•High concentrations of HBr poisoned catalytic activity of Ni-alumina catalyst.•HBr poisoning was more detrimental than HCl poisoning.•HBr poisoning was more detrimental in the presence of CO and CO2.•Nanostructured and mixed-oxide support catalysts were resistant to HBr poisoning. Hydrogen bromide is an emerging impurity of syngas formed during gasification of electronic and municipal solid waste. The influence of HBr on catalytic activity and deactivation of various Ni-based tar reforming catalysts was investigated. The data demonstrate the detrimental effect on catalytic properties (1) occurs at HBr concentrations above 500 ppmv, (2) is more severe compared to HCl and (3) varies greatly with the catalyst structure. The characterization of spent catalysts revealed that the formation of chemisorbed Ni-Br species, enhanced Ni sintering and depletion of NiO-Al2O3 sites could be the reasons for the loss of tar reforming and water-gas shift activities. On the other hand, no significant effect of HBr on catalyst coking was observed. The comparison of different catalysts demonstrated that the negative HBr impact can be successfully mitigated by developing a nanostructured catalyst with high porosity and Ni dispersion that ensure the strong Ni-support interaction.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119435