Alberto Gonzalo

@article{Lavoie2019,

title = {Renewable antioxidant additive for biodiesel obtained from black liquor},

author = {Jean Michel Lavoie and Thierry Ghislain and Emmanuelle Bahl and Jesús Arauzo and Alberto Gonzalo and Noemí Gil-Lalaguna and José Luis Sánchez},

doi = {10.1016/j.fuel.2019.115689},

issn = {00162361},

year  = {2019},

date = {2019-10-01},

journal = {Fuel},

volume = {254},

pages = {115689},

publisher = {Elsevier Ltd},

abstract = {Black liquor obtained from semichemical pulping of barley straw was depolymerized in a stirred autoclave reactor, at temperature in the range of 250–300 °C while varying the amount of catalyst (zeolite Y). Three fractions were obtained from the depolymerized liquor: a fraction directly extracted from the liquid with isopropyl acetate (L$alpha$), a second one which contains the heaviest compounds precipitated from the liquid at pH 1 (L$beta$) and a third one obtained by extraction of the acidified liquid (L$gamma$). The three fractions were tested as antioxidant additives for biodiesel, blending them individually at a dosage of 1 wt%. The antioxidant activity was L$alpha$ > L$gamma$ > L$beta$. The L$alpha$ fraction showed the highest antioxidant activity, increasing the oxidation stability time over neat biodiesel from 150 to 250%. The phenolic volatile content of the fractions (measured by GC/MS) decreased in the same rank (L$alpha$ > L$gamma$ > L$beta$), so there doesn't seem to be correlation between the volatile content and the increase of antioxidant activity. Depolymerizarion temperature was the most influential parameter, showing a clear positive effect on the antioxidant activity for the three fractions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Dueso2018,

title = {Performance and emissions of a diesel engine using sunflower biodiesel with a renewable antioxidant additive from bio-oil},

author = {Cristina Dueso and Mariano Muñoz and Francisco Moreno and Jorge Arroyo and Noemí Gil-Lalaguna and Ana Bautista and Alberto Gonzalo and José Luis Sánchez},

doi = {10.1016/j.fuel.2018.07.013},

issn = {00162361},

year  = {2018},

date = {2018-12-01},

journal = {Fuel},

volume = {234},

pages = {276--285},

publisher = {Elsevier Ltd},

abstract = {The aim of this study is to test the behaviour of sunflower biodiesel in a diesel engine after being treated with a natural antioxidant additive produced from bio-oil extraction (final dosage of bio-oil compounds in doped biodiesel of 1.9 wt%). The influence of this renewable additive in both the engine performance and the produced emissions was evaluated. Five more fuels were used for the sake of comparison: petroleum diesel, neat sunflower biodiesel without additives, commercial biodiesel, commercial B10 blend and another B10 blend prepared from petro-diesel and doped sunflower biodiesel. Brake power was found to be similar for the six fuels, while the brake specific fuel consumption and the brake thermal efficiency were higher for biodiesel fuels. Only slight differences (<1%) were observed between the doped biodiesel and the neat one, showing that the bio-oil based additive did not negatively affect the general performance of the engine. Regarding gas emissions (analysed according to the European Stationary Cycle), weighted average emissions of NOx and CO2 were higher for biodiesel fuels, while CO and opacity factor were lower in that case. Incorporating the bio-oil based additive reduced NOx emissions and smoke opacity by 3.0% and 4.4% compared with neat biodiesel, respectively, whilst CO and HC emissions increased by 0.7 and 14.3% respectively, values still remaining below those of diesel.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Botella2018,

title = {Bio-oil hydrotreatment for enhancing solubility in biodiesel and the oxydation stability of resulting blends},

author = {Lucía Botella and Filip Stankovikj and José Luis Sánchez and Alberto Gonzalo and Jesús Arauzo and Manuel Garcia-Perez},

url = {/pmc/articles/PMC5895764/?report=abstract https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5895764/},

doi = {10.3389/fchem.2018.00083},

issn = {22962646},

year  = {2018},

date = {2018-04-01},

journal = {Frontiers in Chemistry},

volume = {6},

number = {APR},

pages = {83},

publisher = {Frontiers Media S. A},

abstract = {The major challenge for the pyrolytic conversion of lignocellulosic materials into crude bio-oil is the poor quality of the final product. Several strategies (addition of solvents, production of emulsions, and extraction with biodiesel) have been studied to improve its fuel properties. The extraction with biodiesel is an interesting solution because it allows direct utilization of some bio-oil fractions as fuels. However, fraction extracted with biodiesel is typically between 10 and 18 wt. %. In this paper we studied mild hydrotreatment of pyrolysis oil to enhance its solubility in biodiesel. The study was conducted with BTG and Amaron oils hydrotreated at temperatures between 200 and 325°C in the presence of Ru/C catalyst. Hydrotreated oils generated three phases: top oil (light hydrocarbons), middle aqueous phase and bottom heavy oil phase. Each of the phases was characterized and the content of acetic acid, phenols, aromatic compounds, and linear alkane hydrocarbons quantified. The upgraded bio-oils were more soluble in biodiesel than the crude bio-oils, obtaining blends with up to 48 and 38 wt. % for the BTG and Amaron bio-oil, respectively. Some of the fuel properties of the resulting blends are also reported here.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gil-Lalaguna2017,

title = {Obtaining biodiesel antioxidant additives by hydrothermal treatment of lignocellulosic bio-oil},

author = {Noemí Gil-Lalaguna and Ana Bautista and Alberto Gonzalo and José Luis Sánchez and Jesús Arauzo},

doi = {10.1016/j.fuproc.2017.05.020},

issn = {03783820},

year  = {2017},

date = {2017-11-01},

journal = {Fuel Processing Technology},

volume = {166},

pages = {1--7},

publisher = {Elsevier B.V.},

abstract = {The potential use of bio-oil as a small-dosage additive for improving biodiesel oxidation stability has been investigated in this work. Lignocellulosic bio-oil was high-pressure processed under different mixtures of water and organic solvents in order to promote depolymerization of the high molecular lignin still present in bio-oil and increase the content of phenolics, whose antioxidant potential is known. In fact, the antioxidant potential of bio-oil was found to noticeably enhance after the hydrothermal treatment. While the addition of 2% of crude bio-oil improved biodiesel oxidation stability by 135%, the same amount of hydrotreated bio-oil (water, 300 °C, 8.5 MPa) led to an oxidation stability improvement of 400%, which was related to the increase in the concentration of catechol, as well as to the modification of antioxidant properties of the pyrolytic lignin fraction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gonzalo2017,

title = {Evaluation of different agricultural residues as raw materials for pulp and paper production using a semichemical process},

author = {Alberto Gonzalo and Fernando Bimbela and José Luis Sánchez and Jalel Labidi and Fernando Marín and Jesús Arauzo},

doi = {10.1016/j.jclepro.2017.04.036},

issn = {09596526},

year  = {2017},

date = {2017-07-01},

journal = {Journal of Cleaner Production},

volume = {156},

pages = {184--193},

publisher = {Elsevier Ltd},

abstract = {This work assesses six different agricultural residues with the aim of finding alternative raw materials for a soda semichemical pulping process: stems of bell and chili pepper (Capsicum annuum), broad bean (Vicia faba), asparagus (Asparagus officinalis), pea (Pisum sativum), and okra (Abelmoschus esculentus). Pulping yields higher than 60% (m/m) were obtained, except for pea stems (43%). The drainability of all the pulps, expressed as the Schopper-Riegler index (textordmasculineSR), had values of over 70 textordmasculineSR. The Kajaani analyses of the fibers showed acceptable fiber lengths in all cases (0.64–0.92 mm), but on average shorter than the lengths of pulps from a commercial fluting paper (Old corrugated Container, OCC), that was found to be 1.27 mm. Handsheets of paper were produced both with the pulps under study and with mixtures of these pulps with OCC pulp. Several properties were measured to assess the use of the new fibers in a paper for cardboard production. The property showing the greatest differences was the Gurley porosity, ranging from 25 mL/min (asparagus) to 1300 mL/min (broad bean). Of the six residues tested, the okra residue fiber showed better properties than the commercial paper fiber (Concora Medium Test indexes: 1.5 N m2/g and 1.1 N m2/g respectively, Burst Indexes: 2.3 kPa m2/g and 1.7 kPa m2/g, respectively), yielding similar mechanical properties to those of high quality fibers obtained from miscanthus (Miscanthus giganteus). Broad bean residue could also be a promising raw material, though its properties are not as good as okra's.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}