Jesús Arauzo

@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{Abrego2019,

title = {Heat requirement for fixed bed pyrolysis of beechwood chips},

author = {Javier Ábrego and María Atienza-Martínez and F Plou and Jesús Arauzo},

doi = {10.1016/j.energy.2019.04.078},

issn = {03605442},

year  = {2019},

date = {2019-07-01},

journal = {Energy},

volume = {178},

pages = {145--157},

publisher = {Elsevier Ltd},

abstract = {The evaluation of heat of pyrolysis reactions at conditions relevant to the industrial practice is of great importance from the point of view of reactor design. Here, the evolution of heat during the pyrolysis of beechwood chips was experimentally measured in a lab-scale fixed bed pyrolysis system. Wood was heated and pyrolyzed by means of heat transferred from a mass of surrounding inert material (sand) initially heated at temperatures between 400 and 800 °C. Monitoring the evolution of temperatures in the system allowed calculation of heat for pyrolysis (QP) as a function of wood bed temperature. At pyrolysis conditions where slow heating rates of the wood bed are realized, changes in QP were clearly linked to the decomposition of the individual constituents of biomass (cellulose, hemicellulose and lignin), with consecutive exothermic and endothermic stages. When high temperature gradients were present, these stages were simultaneous and QP continuously increased with temperature, reaching 550 kJ kg−1. Under these circumstances, a correlation is provided for QP (T) up to 556 °C. The enthalpy of the pyrolysis reactions ($Delta$HP) was also estimated. Results show good coincidence with previously reported literature values. The proposed experimental system could be useful for determining heat requirements of pyrolysis under different operational conditions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PinheiroPires2019,

title = {Challenges and opportunities for bio-oil refining: A review},

author = {Anamaria Paiva Pinheiro-Pires and Jesús Arauzo and Isabel Fonts and Marcelo E Domine and Alberto Fernández-Arroyo and Martha Estrella Garcia-Perez and Jorge Montoya and Farid Chejne and Peter Pfromm and Manuel Garcia-Perez},

doi = {10.1021/acs.energyfuels.9b00039},

issn = {15205029},

year  = {2019},

date = {2019-06-01},

booktitle = {Energy and Fuels},

volume = {33},

number = {6},

pages = {4683--4720},

publisher = {American Chemical Society},

abstract = {Bio-oil derived from fast pyrolysis of lignocellulosic materials is among the most complex and inexpensive raw oils that can be produced today. Although commercial or demonstration scale fast pyrolysis units can readily produce this oil, the pyrolysis industry has not grown to significant commercial impact due to the lack of bio-oil market pull. This paper is a review of the challenges and opportunities for bio-oil upgrading and refining. Pyrolysis oil consists of six major fractions (water 15-30 wt %, light oxygenates 8-26 wt %, monophenols 2-7 wt %, water insoluble oligomers derived from lignin 15-25 wt %, and water-soluble molecules 10-30 wt %). The composition of water-soluble oligomers is relatively poorly studied. In the 1880s, bio-oil refining (formally known as wood distillation) targeted the separation and commercialization of C1-C4 light oxygenated compounds to produce methanol, acetic acid, and acetone with the commercialization of the lignin derived water insoluble fraction for preserving wooden sailing vessels against rot. More recently, the company Ensyn extracted and commercialized condensed natural smoke as a food additive. Most research efforts in the last 20 years have focused on the two-step hydrotreatment concept for the production of transportation fuels. In spite of major progress, this concept remains at the demonstration scale. In this review, the opportunities and progress to separate bio-oil fractions and chemicals, mainly acetic acid (HAc), hydroxyacetaldehyde (HHA), acetol, and levoglucosan, and convert them into value added coproducts are thoroughly discussed. In spite of the large number of separation schemes and products tested, very few of them have been tested as part of fully integrated bio-oil refinery concepts. The synthesis and techno-economic and environmental evaluation of novel integrated bio-oil refinery concepts is likely to become a subject of intense research activity in the coming years.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Garcia2018,

title = {Influence of operating variables on the aqueous-phase reforming of glycerol over a Ni/Al coprecipitated catalyst},

author = {Lucía García and Ana Valiente and Miriam Oliva and Joaquín Ruiz and Jesús Arauzo},

doi = {10.1016/j.ijhydene.2018.09.119},

issn = {03603199},

year  = {2018},

date = {2018-11-01},

journal = {International Journal of Hydrogen Energy},

volume = {43},

number = {45},

pages = {20392--20407},

publisher = {Elsevier Ltd},

abstract = {A systematic study focused on the aqueous-phase reforming of glycerol has been carried out in order to analyze the influence of several operating variables (system pressure, reaction temperature, glycerol content in feed, liquid feeding rate and catalyst weight/glycerol flow rate ratio) on the gas and liquid products. A continuous flow bench scale installation and a Ni/Al coprecipitated catalyst were employed. The system pressure was varied from 28 to 40 absolute bar, the reaction temperature was analyzed from 495 to 510 K, the glycerol content in the feed was studied from 2 to 10 wt%, the liquid feeding rate was changed from 0.5 to 3.0 mL/min and the catalyst weight/glycerol flow rate ratio varied from 10 to 40 g catalyst min/g glycerol. The main gas products obtained were H2, CO2 and CH4, while the main liquid products were 1,2-propanediol, ethylene glycol, acetol and ethanol. A W/mglycerol ratio of 40 g catalyst min/g glycerol, 34 bar, 500 K, 5 wt% glycerol and 1 mL/min, resulted in a high yield to H2 (6.8%), the highest yield to alkanes (10.7%), the highest 1,2-propanediol yield (0.20 g/g glycerol) and the highest ethylene glycol yield (0.11 g/g glycerol). The highest acetol yield (0.06 g/g glycerol) was obtained at 34 bar, 500 K, 5 wt% glycerol, 20 g catalyst min/g glycerol and 3 mL/min.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Remon2018,

title = {Simultaneous production of gaseous and liquid biofuels from the synergetic co-valorisation of bio-oil and crude glycerol in supercritical water},

author = {Javier Remón and P Arcelus-Arrillaga and Lucía García and Jesús Arauzo},

doi = {10.1016/j.apenergy.2018.07.093},

issn = {03062619},

year  = {2018},

date = {2018-10-01},

journal = {Applied Energy},

volume = {228},

pages = {2275--2287},

publisher = {Elsevier Ltd},

abstract = {This work addresses the co-valorisation in supercritical water of bio-oil obtained from the fast pyrolysis of wood and crude glycerol yielded as a by-product during biodiesel production. The experiments were conducted at 380 °C and 230 bar for 30 min with a Ni-Co/Al-Mg catalyst, analysing the effects on the process of the catalyst loading (0–0.25 g catalyst/g organics) and feed composition (each material alone and all possible binary mixtures). The yields to gas, upgraded bio-oil (liquid) and solid varied as follows: 4–87%, 0–46% and 0–18%, respectively. A synergistic interaction between crude glycerol and bio-oil took place during the upgrading process, which allowed the complete and simultaneous transformation of both materials into gas and liquid bio-fuels with a negligible solid formation. The compositions of the gas and the upgraded liquid can be easy tailored by adjusting the catalyst amount and the composition of the feed. The gas phase was made up of H2 (7–49 vol.%), CO2 (31–56 vol.), CO (0–7 vol.%) and CH4 (6–57 vol.%) and had a Lower Heating Value (LHV) ranging from 8 to 22 MJ/m3 STP. The upgraded bio-oil consisted of a mixture of carboxylic acids (0–73%), furans (0–7%), phenols (0–85%), ketones (0–22%) and cyclic compounds (0–53%). The proportions of C, H and O in the liquid shifted between 66–77 wt.%, 7–11 wt.% and 15–25 wt.%, respectively, while its Higher Heating Value (HHV) ranged from 29 to 34 MJ/kg. An optimum for the simultaneous production of gas and liquid bio-fuels was achieved with a solution having equal amounts of each material and employing a catalyst amount of 0.25 g catalyst/g organics. Under such conditions, 37% of the bio-oil was transformed into an upgraded liquid having a HHV (32 MJ/kg) two times higher than the original material (16 MJ/kg) with a negligible solid formation; the rest of the bio-oil and all the crude glycerol being converted into a rich CH4 (55 vol.%) biogas with a high LHV (21 MJ/m3 STP). This represents a step-change in future energy production and can help to establish the basis for a more efficient and sustainable biomass valorisation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}