Magnetic amphiphilic nanocomposites based on silica–carbon for sulphur contaminant oxidation

Oliveira, Aline Silva de; Christofani, Taís; Teixeira, Ivo F.; Ardisson, José D.; Moura, Flávia C.C.

doi:10.1039/c5nj00593k

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…The increased polarity and high interfacial area were also responsible for facilitating the extraction of DBTO 2 [143]. Figure 11 shows the presumed mechanism for emulsified systems, adapted from elsewhere [144][145][146]. Other authors have also reported ODS emulsion systems that rely upon amphiphilic catalysts to increase catalytic activity [147].…”

Section: Amphiphilic Carbonsmentioning

confidence: 97%

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

et al. 2021

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Sulfur (S) and nitrogen (N) are elements naturally found in petroleum-based fuels. S- and N-based compounds in liquid fuels are associated with a series of health and environmental issues. Thus, legislation has become stricter worldwide regarding their content and related emissions. Traditional treatment systems (namely hydrodesulfurization and hydrodenitrogenation) fail to achieve the desired levels of S and N contents in fuels without compromising combustion parameters. Thus, oxidative treatments (oxidative desulfurization–ODS, and oxidative denitrogenation-ODN) are emerging as alternatives to producing ultra-low-sulfur and nitrogen fuels. This paper presents a thorough review of ODS and ODN processes applying carbon-based materials, either in hybrid forms or as catalysts on their own. Focus is brought to the role of the carbonaceous structure in oxidative treatments. Furthermore, a special section related to the use of amphiphilic carbon-based catalysts, which have some advantages related to a closer interaction with the oily and aqueous phases, is discussed.

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Section: Amphiphilic Carbonsmentioning

confidence: 97%

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

et al. 2021

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“…Teixeira et al [37] produziram nanotubos de carbono sobre Al 2 O 3 contendo Fe/Mo e aplicaram-nos num meio bifásico com H 2 O 2 para remover DBT e QN de uma fase oleosa, tendo sido observada a sua completa oxidação em 200 e 30 min de reação, respetivamente. Oliveira et al [41] usaram compósitos de SiC na oxidação bifásica de compostos sulfurados numa amostra de diesel, permitindo uma remoção de 57% desses compostos. Santos et al [38] testaram compósitos de nanotubos de carbono/nanotubos de titânio para a oxidação em meio bifásico do amarelo de metilo (MY) e do álcool benzílico com H 2 O 2 , atingindo 100% de remoção de 30 mg L -1 de MY em 60 min de reação e mais de 90% de álcool benzílico em 3 h de reação.…”

Section: Processos Avançados De Oxidação (Aops)unclassified

Águas Oleosas Contaminadas: Ameaças, Tratamentos e Desafios

Faria¹,

Gomes²,

Silva³

et al. 2021

BSPQuimica

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Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

Martins

Salviano

Oliveira

et al. 2016

Environ Sci Pollut Res

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In this work, mesoporous silica mobil composition of matter no. 41 (MCM-41) was synthesized by the sol-gel method. Two different surface modifications were made to transform this material into a very active adsorbent and catalyst support: (i) impregnation of iron nanoparticles and (ii) hydrophobization via chemical vapor deposition (CVD) with ethanol. The materials prepared with different iron contents, i.e., 2.5, 5, and 10 %, after hydrophobization, were characterized by several techniques. CHN analysis and Raman spectroscopy proved that approximately 15 % of carbon is deposited during CVD process mainly as organized carbonaceous structures. The specific surface area was determined by the BET method as up to 1080 m g, which explains the excellent results of the materials in the adsorption of model dyes methylene blue and indigo carmine. Mössbauer spectroscopy, thermogravimetric (TG)/DTG analysis, and transmission electron microscopy (TEM) images showed that the iron supported may be partially reduced during the CVD process to Fe species, which are stabilized by the carbon coating. This iron species plays an important role in the oxidation of different contaminants, such as quinoline and methylene blue. The results obtained in the catalytic tests showed to be very promising.

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Magnetic amphiphilic nanocomposites based on silica–carbon for sulphur contaminant oxidation

Abstract: Magnetic amphiphilic nanocomposites based on silica–carbon promote the desulfurization of diesel fuel and their activity is enhanced by Mo nuclei supported on the surface.

Cited by 4 publications

References 41 publications

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

Carbon-Based Materials for Oxidative Desulfurization and Denitrogenation of Fuels: A Review

Águas Oleosas Contaminadas: Ameaças, Tratamentos e Desafios

Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

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