Alberto Gonzalo

@article{Garcia2017,

title = {Antioxidants for biodiesel: Additives prepared from extracted fractions of bio-oil},

author = {Manuel García and Lucía Botella and Noemí Gil-Lalaguna and Jesús Arauzo and Alberto Gonzalo and José Luis Sánchez},

doi = {10.1016/j.fuproc.2016.10.001},

issn = {03783820},

year  = {2017},

date = {2017-02-01},

journal = {Fuel Processing Technology},

volume = {156},

pages = {407--414},

publisher = {Elsevier B.V.},

abstract = {Unlike petroleum diesel, the chemical structure of biodiesel makes it prone to oxidation during long-term storage, thus involving fuel quality deterioration. Therefore, the addition of antioxidants is usually required to meet the quality standards for biodiesel commercialization. Synthetic sterically-hindered phenols have been usually employed for this purpose as free radical scavenging antioxidants. However, naturally occurring phenolics are also available, for example, in the bio-oil produced in the pyrolysis of lignocellulosic biomass. In this work, the antioxidant potential of extracted fractions of lignocellulosic bio-oil has been evaluated. Different organic solvents were tested as extraction agents, acetate esters being the best ones for incorporating bio-oil antioxidant compounds into biodiesel. In the best case, the incorporation of a small concentration of bio-oil compounds (< 4 wt.%) led to an improvement of the biodiesel oxidation stability of 475% which, in our case, was enough to meet the European standard requirement.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Botella2016,

title = {Enhancement of Biodiesel Oxidation Stability Using Additives Obtained from Sewage Sludge Fast-Pyrolysis Liquids},

author = {Lucía Botella and Marina Sierra and Fernando Bimbela and Gloria Gea and José Luis Sánchez and Alberto Gonzalo},

url = {https://pubs.acs.org/sharingguidelines},

doi = {10.1021/acs.energyfuels.5b01681},

issn = {15205029},

year  = {2016},

date = {2016-01-01},

journal = {Energy and Fuels},

volume = {30},

number = {1},

pages = {302--310},

publisher = {American Chemical Society},

abstract = {In the present work, bio-oil derived from the catalytic pyrolysis of sewage sludge has been blended in small amounts with sunflower biodiesel with the aim of evaluating its potential as a novel, low-cost, and renewable biodiesel additive that could replace costly commercial biodiesel antioxidants normally used to date. The effect of blending small amounts of bio-oil with sunflower biodiesel on the biodiesel properties (oxidation stability, cold flow properties, flash point, and viscosity) has been analyzed. Furthermore, apart from studying the effect of adding low bio-oil concentrations (0.1, 1.8, and 3.5 mass %), the effect of other operating conditions, specifically the temperature (278-333 K) and mixing time (5-60 min), during the bio-oil and biodiesel blend preparations has also been analyzed. With regard the oxidation stability, blends prepared adding 3.5% mass fraction of bio-oil complied with the limits imposed by the ASTM D6751 and EN 14214 standards. Blending sewage sludge bio-oil and sunflower biodiesel did not result in an enhancement of the biodiesel cold flow properties in the studied range, while the flash point of these blends was lower than that of pure sunflower biodiesel. The viscosity was barely affected in all cases. The oxidation stability enhancement achieved by the addition of bio-oil obtained from sewage sludge catalytic pyrolysis was higher than the enhancement obtained with bio-oil from non-catalytic pyrolysis.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Garcia2013a,

title = {Influence of feedstock composition in fluidised bed co-gasification of mixtures of lignite, bituminous coal and sewage sludge},

author = {Gorka García and Jesús Arauzo and Alberto Gonzalo and José Luis Sánchez and Javier Ábrego},

url = {http://www.sciencedirect.com/science/article/pii/S1385894713002398},

issn = {13858947},

year  = {2013},

date = {2013-04-01},

journal = {Chemical Engineering Journal},

volume = {222},

pages = {345--352},

abstract = {Energy recovery from sewage sludge can be achieved by several thermochemical processes, including its co-processing with other fuels. In this work, co-gasification of mixtures of sewage sludge with two types of coal (bituminous and lignite) was performed in a laboratory-scale fluidised bed reactor. The influence of the feedstock composition on key parameters of gasification—such as gas heating value and yield, cold gas efficiency and tar generation—was determined. Whereas some of these results can be explained as the sum of individual contributions of each feedstock component, some synergistic effects were also identified. Among these, the decrease of tar yield and the increase of H2 and CO in the gas suggest that co-gasification of sewage sludge with certain types of coal may be energetically advantageous and improve the process performance.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Garcia2013bb,

title = {Density of alkyl esters and its mixtures: A comparison and improvement of predictive models},

author = {Manuel García and Juan-José Alba and Alberto Gonzalo and José Luis Sánchez and Jesús Arauzo},

url = {http://www.sciencedirect.com/science/article/pii/S0016236112006096},

issn = {00162361},

year  = {2013},

date = {2013-01-01},

journal = {Fuel},

volume = {103},

pages = {232--238},

abstract = {Biodiesel density is a key parameter in biodiesel simulations and process development. In this work we selected, evaluated and improved two density models; one theoretical (Rackett–Soave) and one empirical (Lapuerta's method) for methanol based biodiesels (FAME) and ethanol based biodiesel (FAEE). For this purpose, biodiesel was produced from vegetable oils (sunflower, rapeseed, soybean, olive, safflower and two other commercial mixtures of vegetable oils) and animal fats (edible and crude pork fat and beef tallow) using both methanol and ethanol for the transesterification reactions, and blended to get 21 FAME and 21 FAEE, reporting their density and detailed composition. Bibliographic data have also been used. The Rackett–Soave method has been improved by the use of a new acentric factor correlation, whereas the parameters of the empirical one are improved by considering a bigger density data bank. Results show that the evaluated models could be used to estimate the biodiesel density with a good grade of accuracy but the performed modifications improve the accuracy of the models: ARD (%) for FAME; 0.33, and FAEE; 0.26, both calculated with the modification of Rackett–Soave method and ARD (%) for FAME; 0.40 calculated with the modification of Lapuerta's method.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Serrano2012,

title = {Integral use of pepper stems},

author = {Luis Serrano and Fernando Marín and Alberto Gonzalo and Jalel Labidi},

url = {http://www.sciencedirect.com/science/article/pii/S0926669012001446},

issn = {09266690},

year  = {2012},

date = {2012-11-01},

journal = {Industrial Crops and Products},

volume = {40},

pages = {110--115},

abstract = {Pepper stems were treated for its integral utilization. Characterization of original pepper stems (63.4% holocellulose, 23.3% hemicelluloses, 25.6% lignin) was done according to standards methods. In this work, the valorisation of these components was studied. Hemicelluloses fraction recovered from the hydrolsated pepper stems presented xylose and glucose as the main simple sugars, representing 39% and 19.9% of total sugars content in the autohydrolysis hydrolysates and 59.8% and 16% in the acid hydrolysates respectively. Physical properties of paper sheets formed with soda pulp from pre-hydrolysated pepper stems were measured with high 76 °SR value, and cellulose and lignin fractions from pulp and black liquor were recovered respectively. Cellulose was characterized by ATR-IR to complete the chemical structure analysis. Lignin isolated from the liquid was submitted to ATR-IR, 1H NMR, GPC and TGA in order to suggest suitable applications based on its physicochemical properties.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}