Publications
131 results found
Crittenden BD, Hewitt GF, Millan-Agorio M, et al., 2015, Experimental Generation of Fouling Deposits, CRUDE OIL FOULING: DEPOSIT CHARACTERIZATION, MEASUREMENTS, AND MODELING, Editors: Coletti, Hewitt, Publisher: GULF PROFESSIONAL PUBL, Pages: 51-94, ISBN: 978-0-12-801256-7
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- Citations: 1
Chew J, Joshi HM, Kazarian SG, et al., 2015, Deposit Characterization and Measurements, CRUDE OIL FOULING: DEPOSIT CHARACTERIZATION, MEASUREMENTS, AND MODELING, Editors: Coletti, Hewitt, Publisher: GULF PROFESSIONAL PUBL, Pages: 95-178, ISBN: 978-0-12-801256-7
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- Citations: 7
Fidalgo B, van Niekerk D, Millan M, 2014, The effect of syngas on tar quality and quantity in pyrolysis of a typical South African inertinite-rich coal, FUEL, Vol: 134, Pages: 90-96, ISSN: 0016-2361
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- Citations: 25
Jano-Ito MA, Reed GP, Milian M, 2014, Comparison of Thermodynamic Equilibrium Predictions on Trace Element Speciation in Oxy-Fuel and Conventional Coal Combustion Power Plants, ENERGY & FUELS, Vol: 28, Pages: 4666-4683, ISSN: 0887-0624
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- Citations: 17
Pinilla JL, Puron H, Torres D, et al., 2014, Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing, Applied Catalysis B: Environmental, Vol: 148-149, Pages: 357-365, ISSN: 0926-3373
Catalysts based on functionalised carbon nanofibers (FCNF) coated with Ni-decorated MoS2 nanosheets were obtained by direct decomposition of ammonium thiomolybdate and nickel nitrate impregnated on the FCNF under controlled temperature conditions in inert atmosphere. The catalysts were characterised by X-ray diffraction (XRD), N2 adsorption, Raman spectroscopy, temperature programmed reduction of sulfur species (TPR-S), NH3 temperature programmed desorption (NH3-TPD) and transmission electron microscopy (TEM). Decomposition temperature was found to have a paramount importance in the formation of uniform MoS2 slabs, as revealed by the TEM study: at 600 °C, non-uniform covering of the carbon nanofiber (CNF) was observed together with the presence of small round-shaped metal particles (ca. 20 nm). On the other hand, at 450 °C CNF appeared homogeneously covered by amorphous MoS2 slabs decorated with Ni, resulting in higher amount of coordinated unsaturated sites (CUS), as determined by TPR-S. Catalysts were tested in the hydroprocessing of a vacuum residue and the results were compared against a benchmark alumina-supported NiMo catalyst. Higher asphaltene conversions were obtained for the CNF-supported catalysts prepared at 450 °C, which overperformed the Al2O3-supported benchmark catalyst. However, the catalytic performance in hydrodesulfurisation and hydrodemetallisation of the CNF-based catalysts was slightly lower than that of the benchmark catalyst.
Dabai F, Paterson N, Milian M, et al., 2014, Tar Formation and Destruction in a Fixed Bed Reactor Simulating Downdraft Gasification: Effect of Reaction Conditions on Tar Cracking Products, ENERGY & FUELS, Vol: 28, Pages: 1970-1982, ISSN: 0887-0624
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- Citations: 32
Pinilla JL, Garcia AB, Philippot K, et al., 2014, Carbon-supported Pd nanoparticles as catalysts for anthracene hydrogenation, FUEL, Vol: 116, Pages: 729-735, ISSN: 0016-2361
Arcelus-Arrillaga P, Millan M, Hellgardt K, 2014, Effect of pressure, O/ostoich ratio and temperature on the partial oxidation of heavy oil model compound phenanthrene, Pages: 483-485
An increasing world energy demand and the proportions of heavy oil reserves relative to lighter and more valuable feedstocks have enabled the development of new emerging research fields. A novel method to upgrade heavy oil through partial oxidation in supercritical water (SCW) is being developed in the research group. This method takes advantage of the properties of SCW (T=374°C, P=220 bar and δ=0.32 g/ml and above), in which water changes from a good solvent for polar to non-polar species. At these conditions a change in the ion product, in the viscosity and a decrease in the dielectric constant are observed [1]. Studies with model compounds representing chemical structures found in heavy oils give relevant information about the reactivity in the medium and the reaction mechanisms occurring in the system. Reactions with polycyclic aromatic hydrocarbons have been studied in the presence and absence of an oxidizer [2, 3]. The aim of this work is to investigate and get an understanding about the effect of process conditions pressure, temperature and O/Ostoich ratio in the yield and selectivity to different reaction products of the partial oxidation of heavy oil model compound phenanthrene at near and supercritical water conditions.
Puron H, Arcelus-Arrillaga P, Chin KK, et al., 2014, Kinetic analysis of vacuum residue hydrocracking in early reaction stages, FUEL, Vol: 117, Pages: 408-414, ISSN: 0016-2361
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- Citations: 36
Lorente E, Berrueco C, Millan M, et al., 2013, Effect of tar fractions from coal gasification on nickel-yttria stabilized zirconia and nickel-gadolinium doped ceria solid oxide fuel cell anode materials, JOURNAL OF POWER SOURCES, Vol: 242, Pages: 824-831, ISSN: 0378-7753
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- Citations: 24
Cordella M, Berrueco C, Santarelli F, et al., 2013, Yields and ageing of the liquids obtained by slow pyrolysis of sorghum, switchgrass and corn stalks, JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, Vol: 104, Pages: 316-324, ISSN: 0165-2370
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- Citations: 32
de Llobet S, Puron H, Pinilla JL, et al., 2013, Tailored synthesis of organised mesoporous aluminas prepared by non-ionic surfactant templating using a Box-Wilson CCF design, MICROPOROUS AND MESOPOROUS MATERIALS, Vol: 179, Pages: 69-77, ISSN: 1387-1811
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- Citations: 6
George A, Lorente E, Berrueco C, et al., 2013, Structural Properties and Molecular Mass Distributions of Biomass-Coal Cogasification Tars as a Function of Aging, ENERGY & FUELS, Vol: 27, Pages: 3786-3801, ISSN: 0887-0624
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- Citations: 7
Pinilla JL, Arcelus-Arrillaga P, Puron H, et al., 2013, Reaction pathways of anthracene selective catalytic steam cracking using a NiK/Al<sub>2</sub>O<sub>3</sub> catalyst, FUEL, Vol: 109, Pages: 303-308, ISSN: 0016-2361
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- Citations: 27
Puron H, Pinilla JL, Berrueco C, et al., 2013, Hydrocracking of Maya Vacuum Residue with NiMo Catalysts Supported on Mesoporous Alumina and Silica-Alumina, ENERGY & FUELS, Vol: 27, Pages: 3952-3960, ISSN: 0887-0624
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- Citations: 49
Pinilla JL, Arcelus-Arrillaga P, Puron H, et al., 2013, Selective Catalytic Steam Cracking of anthracene using mesoporous Al<sub>2</sub>O<sub>3</sub> supported Ni-based catalysts doped with Na, Ca or K, APPLIED CATALYSIS A-GENERAL, Vol: 459, Pages: 17-25, ISSN: 0926-860X
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- Citations: 37
Leyva C, Ancheyta J, Berrueco C, et al., 2013, Chemical characterization of asphaltenes from various crude oils, FUEL PROCESSING TECHNOLOGY, Vol: 106, Pages: 734-738, ISSN: 0378-3820
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- Citations: 54
Berrueco C, Alvarez P, Diez N, et al., 2012, Characterisation and feasibility as carbon fibre precursors of isotropic pitches derived from anthracene oil, FUEL, Vol: 101, Pages: 9-15, ISSN: 0016-2361
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- Citations: 31
Daud M, Pinilla JL, Arcelus-Arrillaga P, et al., 2012, Heavy oil upgrading in subcritical and supercritical water: Studies on model compounds, 244th National Fall Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Lorente E, Berrueco C, Herod AA, et al., 2012, The detection of high-mass aliphatics in petroleum by matrix-assisted laser desorption/ionisation mass spectrometry, RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Vol: 26, Pages: 1581-1590, ISSN: 0951-4198
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- Citations: 14
Lorente E, Millan M, Brandon NP, 2012, Use of gasification syngas in SOFC: Impact of real tar on anode materials, INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Vol: 37, Pages: 7271-7278, ISSN: 0360-3199
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- Citations: 83
Alvarez P, Menendez JL, Berrueco C, et al., 2012, Determination of crude oil incompatibility regions by ellipsometry, FUEL PROCESSING TECHNOLOGY, Vol: 96, Pages: 16-21, ISSN: 0378-3820
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- Citations: 9
Mermelstein J, Milian M, Brandon NP, 2011, The interaction of biomass gasification syngas components with tar in a solid oxide fuel cell and operational conditions to mitigate carbon deposition on nickel-gadolinium doped ceria anodes, JOURNAL OF POWER SOURCES, Vol: 196, Pages: 5027-5034, ISSN: 0378-7753
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- Citations: 37
Macchietto S, Hewitt GF, Coletti F, et al., 2011, Fouling in Crude Oil Preheat Trains: A Systematic Solution to an Old Problem, HEAT TRANSFER ENGINEERING, Vol: 32, Pages: 197-215, ISSN: 0145-7632
Liu M, Millan-Agorio MG, Aravind PV, et al., 2011, Influence of Operation Conditions on Carbon Deposition in SOFCs Fuelled by Tar-containing Biosyngas, 12th International Symposium on Solid Oxide Fuel Cells (SOFC), Publisher: ELECTROCHEMICAL SOC INC, Pages: 2701-2712, ISSN: 1938-5862
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- Citations: 4
Young A, Venditti S, Berrueco C, et al., 2011, Characterization of Crude Oils and Their Fouling Deposits Using a Batch Stirred Cell System, HEAT TRANSFER ENGINEERING, Vol: 32, Pages: 216-227, ISSN: 0145-7632
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- Citations: 34
Spiegl N, Paterson N, Berrueco C, et al., 2010, Fluidised bed co-gasification of coal and biomass under oxy-fuel conditions, Pages: 1630-1640
Fluidised bed gasifiers are the preferred option to utilise low value coal, biomass and waste. However, fluidised bed gasifiers are traditionally air rather than oxygen-blown to avoid high temperatures in the gasifier leading to ash melting and loss of fluidisation. Therefore the flue gas of a possible FB-IGCC plant would be diluted by nitrogen, making expensive N 2-CO2 separation technology necessary for subsequent capture and storage of the CO2 (CCS). To overcome this disadvantage, an oxy-fuel process is proposed, where the bed is fluidised with recycled flue gas (mainly CO2) and oxygen. A laboratory scale fluidised bed gasifier capable to operate up to 1000°C and 20 bar was set up to study the implications of oxy-fuel firing on flue gas composition and overall operability of the gasifier. High carbon conversions were achieved at 950°C with CO 2 as gasification agent. At that temperature, the addition of O 2 generated some agglomeration in the bed, leading to lower conversions. At lower temperatures, O2 addition increased carbon conversion, but not the heating value of the gases. The addition of steam enabled the gasifier to operate at lower temperatures without decreasing conversion and to increase the hydrogen content of the fuel gas. Pressure on the other hand produced a decrease in carbon conversion, mainly above 10 bars, due to a larger formation of secondary char with the subsequent loss in reactivity. These results show that oxy-fuel firing of a fluidised bed gasifier could be a promising route to avoid N2 dilution of the fuel gas and enable integration of fluidised bed gasification with CCS technology.
Mohamad Daud AR, Millan M, Hellgardt K, et al., 2010, Supercritical water partial oxidation cracking of three-member ring polycyclic aromatic hydrocarbon compounds
Supercritical water partial oxidation cracking of PAH compounds was studied. A three-member ring PAH isomers, i.e., anthracene and phenanthrene were used as model compounds with aqueous hydrogen peroxide as oxidant. At 450°C, anthracene was partially oxidized to mainly 9,10-anthraquinone, 9,10-anthracenedione,2-hydroxy, xanthone, benzoic acid, naphthalene, and phenol while phenanthrene was converted into 4-hydroxy,9-fluorenone, anthraquinone, fluorenone, benzoic acid, naphthalene, and phenol. Increasing the reaction time contributed to the loss of oxygenated functionalities and hence enhanced the formation of neutral aromatic fragments, i.e., naphthalene, biphenyl, and fluorene. This is an abstract of a paper presented at the 19th International Congress of Chemical and Process Engineering and 7th European Congress of Chemical Engineering (Prague, Czech Republic 8/28/2010-9/1/2010).
George A, Morgan TJ, Alvarez P, et al., 2010, Fractionation of a coal tar pitch by ultra-filtration, and characterization by size exclusion chromatography, UV-fluorescence and laser desorption-mass spectroscopy, FUEL, Vol: 89, Pages: 2953-2970, ISSN: 0016-2361
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- Citations: 31
Spiegl N, Sivena A, Lorente E, et al., 2010, Investigation of the Oxy-fuel Gasification of Coal in a Laboratory-Scale Spouted-Bed Reactor: Reactor Modifications and Initial Results, ENERGY & FUELS, Vol: 24, Pages: 5281-5288, ISSN: 0887-0624
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- Citations: 22
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