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Orientador(es)
Resumo(s)
Nitrogenated compounds are naturally found in petroleum-based products. Upon their
combustion, hazardous gases (NOx) are generated, leading to environmental and health
issues. To overcome the downsides related to nitrogen oxides,1 catalytic oxidative
denitrogenation (ODN) with H2O2 is currently seen as a suitable alternative to traditional
hydrodenitrogenation. In this work, the catalysts for ODN consisted of carbon nanotubes
synthesized from low-density polyethylene as a carbon source by chemical vapor deposition
(850 °C, 1 h). A simulated fuel was prepared by dissolving quinoline (QN) in 2,2,4-
trimethylpentane ([N]0 = 50 ppm, [QN]0 = 460 ppm). ODN was carried out in an emulsified
system (80:20 2,2,4-trimethylpentane:water, Vtotal = 20 mL) at 50 °C, 4 h, Ccatalyst = 2.5 g L-
1 and VH2O2, 30 wt.% = 0.9 mL (5.5× the stoichiometric ratio for QN mineralization). The
emulsion was formed by sonication for 15 min. The obtained results are summarized in Fig.
1. ODN carried out at the initial pH (pH0) 3.5 resulted in 74% of QN removal from the oil
phase, which is far higher when compared to only 15% removal occurring by mass
transference (test conducted with an aqueous phase free of H2O2 and catalyst). At pH0 = 6.5,
QN removal from the oil phase decreased drastically to 33%, indicating that a lower pH
favor QN removal.
Descrição
Palavras-chave
Nitrogenated compounds Research Subject Categories::TECHNOLOGY::Chemical engineering::Food technology
Contexto Educativo
Citação
Roman, Fernanda; Díaz de Tuesta, Jose Luis; Silva, Adrián; Faria, Joaquim; Gomes, Helder (2021). Selective oxidation of quinoline in an emulsified system using carbon nanotubes derived from LDPE as catalysts: pH effect. In Book of Abstracts of XI National Meeting on Catalysis and Porous Materials - II Meeting of the Carbon Group. Aveiro
Editora
Sociedade Portuguesa de Química