Archives: Peer-Reviewed Studies

Elucidation of the volatile composition of Marsala wines by using comprehensive two-dimensional gas chromatography

Authors: Giacomo Dugo, Flavio A. Franchina, Maria R. Scandinaro, Ivana Bonaccorsi, Nicola Cicero, Peter Q. Tranchida, Luigi Mondello Abstract The present contribution describes a research work focused on the elucidation of the composition of the headspace of Marsala wine. Four sample-types, of different ageing (“fine”, “superiore secco”, “superiore riserva”, “vergine”) were subjected to headspace solid-phase …

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Hydrotreating of fast pyrolysis oils from protein-rich pennycress seed presscake

Authors: Charles A. Mullen, Akwasi A. Boateng, Stephen E.Reichenbach Abstract The fast pyrolysis oils produced from proteinaceous biomass, such as pennycress presscake differ significantly from those produced from biomass with mostly lignocellulosic composition. Those from proteinaceous biomass tend to be deoxygenated, contain more nitrogen, be less acidic and be more stable. Because their composition is …

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Conversion of furfuryl alcohol to ethyl levulinate using porous aluminosilicate acid catalysts

Authors: Patrícia Neves, Sérgio Lima, Martyn Pillinger, Sílvia M. Rocha, João Rocha, Anabela A. Valente Abstract The following porous aluminosilicates were tested as acid catalysts in the reaction of furfuryl alcohol (FA) with ethanol, at 140 °C: micro/mesoporous composite Beta/TUD-1 and the correspondent nanocrystalline (large pore) zeolite H-Beta; ITQ-2 and its zeolite counterpart (medium pore) H-MCM-22; mesoporous Al-TUD-1. …

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Analysis of fractions and bio-oil of sugar cane straw by one-dimensional and two-dimensional gas chromatography with quadrupole mass spectrometry (GC × GC/qMS)

Authors: Michele E.da Cunha, Jaderson K. Schneider, Márcia C.Brasil, Claudia A. Cardoso, Luciana R. Monteiro, Fábio L. Mendes, Andrea Pinho, Rosângela A. Jacques, Maria Elisabete Machado, Lisiane S. Freitas, Elina B. Caramão Abstract This paper describes the use of GC × GC/qMS for the characterization of bio-oil from the pyrolysis of sugar cane straw and its fractions …

Analysis of fractions and bio-oil of sugar cane straw by one-dimensional and two-dimensional gas chromatography with quadrupole mass spectrometry (GC × GC/qMS) Read More »

Catalytic hydroconversion of a wheat straw soda lignin: Characterization of the products and the lignin residue

Authors: B.JoffresabC.LorentzaM.VidaliebD.LaurentiaA.-A.QuoineaudbN.CharonbA.DaudinbA.QuignardbC.Geanteta Abstract A wheat straw soda lignin was characterized and converted into gases and liquids under H2 pressure, at 350 °C over a supported NiMo sulfide catalyst, using tetralin as a hydrogen-donor solvent in a batch autoclave. The aim of this work was to evaluate the transformations occurring during the temperature increasing step to reach a …

Catalytic hydroconversion of a wheat straw soda lignin: Characterization of the products and the lignin residue Read More »

Application of ferrierite zeolite in high-olefin catalytic cracking

Authors: Raquel Bastiani, Yiu Lau Lam, Cristiane Assumpção Henriques, Victor Teixeira da Silva Abstract The potential use of pure ferrierite (H-FER) or H-FER/H-ZSM-5 blends in catalytic cracking to enhance the production of light olefins was evaluated in the catalytic cracking of n-hexane at 500 °C and the high-olefin catalytic cracking (HOCC) of a Brazilian gasoil feedstock at 600 °C. For the …

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Aqueous phase reactions of pentoses in the presence of nanocrystalline zeolite beta: Identification of by-products and kinetic modelling

Authors: Luís R. Ferreira, Sérgio Lima, Patrícia Neves, Margarida M. Antunes, Sílvia M. Rocha, Martyn Pillinger, Inês Portugal, Anabela A.Valente Abstract Furfural, a valuable platform chemical that has the potential to replace a variety of oil/coal/gas derived materials and chemical products, is produced by the dehydration of d-xylose, which in turn is obtained from lignocellulosic biomass. …

Aqueous phase reactions of pentoses in the presence of nanocrystalline zeolite beta: Identification of by-products and kinetic modelling Read More »

Chemical characterization of organic microcontaminant sources and biological effects in riverine sediments impacted by urban sewage and pulp mill discharges

Authors: S. Chamorro, V. Hernández, V. Matamoros, C. Domínguez, J. Becerra, G. Vidal, B. Piña, J.M. Bayona Abstract The Biobío River basin is highly impacted by a variety of anthropogenic activities such as pulp mills and urban wastewaters subjected to different treatment processes. This work assesses for the first time, the contamination source and biological …

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Catalytic dehydration of d-xylose to 2-furfuraldehyde in the presence of Zr-(W,Al) mixed oxides. Tracing by-products using two-dimensional gas chromatography-time-of-flight mass spectrometry

Authors: Margarida M. Antunes, Sérgio Lima, Auguste Fernandes, Joana Candeias, Martyn Pillinger, Sílvia M. Rocha, Maria Filipa Ribeiro, Anabela A. Valente Abstract Zirconium-tungsten mixed oxides (ZrW) are effective catalysts in the aqueous-phase dehydration of d-xylose to 2-furfuraldehyde (Fur), at 170 °C. The texture and acid properties of ZrW materials were modified to enhance Fur yields. The catalysts …

Catalytic dehydration of d-xylose to 2-furfuraldehyde in the presence of Zr-(W,Al) mixed oxides. Tracing by-products using two-dimensional gas chromatography-time-of-flight mass spectrometry Read More »

Global and selective detection of organohalogens in environmental samples by comprehensive two-dimensional gas chromatography–tandem mass spectrometry and high-resolution time-of-flight mass spectrometry

Authors: Shunji Hashimoto, YoshikatsuTakazawa, Akihiro Fushimi, Kiyoshi Tanabe, Yasuyuki Shibata, TeruyoIeda Nobuo Ochiai, Hirooki Kanda, Takeshi Ohura, Qingping Tao, Stephen E. Reichenbach Abstract We successfully detected halogenated compounds from several kinds of environmental samples by using a comprehensive two-dimensional gas chromatograph coupled with a tandem mass spectrometer (GC × GC–MS/MS). For the global detection of organohalogens, fly …

Global and selective detection of organohalogens in environmental samples by comprehensive two-dimensional gas chromatography–tandem mass spectrometry and high-resolution time-of-flight mass spectrometry Read More »