Miriam Oliva

@article{raso_aqueous_2023,

title = {Aqueous phase hydrogenolysis of glycerol with in situ generated hydrogen over Ni/Al3Fe1 catalyst: effect of the calcination temperature},

author = {Raquel Raso and Alejandro Lete and Lucía García and Joaquín Ruiz and Miriam Oliva and Jesús Arauzo},

url = {https://pubs.rsc.org/en/content/articlelanding/2023/ra/d2ra07929a},

doi = {10.1039/D2RA07929A},

issn = {2046-2069},

year  = {2023},

date = {2023-02-01},

urldate = {2023-02-01},

journal = {RSC Advances},

volume = {13},

number = {8},

pages = {5483–5495},

abstract = {The present work studied the influence of the calcination temperature on the aqueous phase hydrogenolysis of glycerol with in situ generated hydrogen over a Ni/Al3Fe1 catalyst. The Ni/Al3Fe1 catalyst was synthesized by the co-precipitation method at 28 mol% of Ni (Ni/(Ni + Al + Fe)) and a molar ratio of Al/Fe of 3/1. The prepared catalyst was calcined at different temperatures (500–750 °C). The obtained samples were tested for the aqueous phase hydrogenolysis (APH) of glycerol and characterized by several analytical techniques (ICP-OES, H2-TPR, XRD, N2-physisorption, NH3-TPD, STEM, FESEM, and TGA). The catalyst calcined at 625 °C was selected as the best sample due to its high acidity, metal dispersion, and catalytic activity; 1,2-propanediol was the highest carbon selectivity product. In addition, it experienced lower metal leaching than the catalyst calcined at 500 °C.},

note = {Publisher: The Royal Society of Chemistry},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fortea2021,

title = {An Insight into the Separation of 1,2-Propanediol, Ethylene Glycol, Acetol and Glycerol from an Aqueous Solution by Adsorption on Activated Carbon},

author = {Jorge Fortea and Lucía García and Joaquín Ruiz and Miriam Oliva and Jesús Arauzo},

url = {https://www.mdpi.com/2227-9717/9/8/1438/htm https://www.mdpi.com/2227-9717/9/8/1438},

doi = {10.3390/PR9081438},

issn = {2227-9717},

year  = {2021},

date = {2021-08-01},

journal = {Processes 2021, Vol. 9, Page 1438},

volume = {9},

number = {8},

pages = {1438},

publisher = {Multidisciplinary Digital Publishing Institute},

abstract = {Glycerol conversion processes such as aqueous phase reforming and hydrogenolysis generate value-added compounds highly diluted in water. Because distillation is a high energy demand separation step, adsorption could be an attractive alternative to recover these chemicals. Adsorption isotherms of 1,2-propanediol, acetol, ethylene glycol and glycerol onto activated carbon were determined by batch adsorption experiments. These isotherms were fitted slightly better to the Freundlich equation than to the Langmuir equation. Acetol is the compound with the highest adsorption at concentrations smaller than 1 M. Properties of the adsorbate such as the −OH group number, chain length, molecular size and dipole moment, besides characteristics of the adsorbent such as the surface area, oxygen and ash content, are considered to explain the observed results. Moreover, adsorption experiments were performed with mixtures of compounds and it was determined that the molar amount adsorbed is less than predicted from the adsorption isotherms of the individual compounds treated separately. In addition, the influence of the activated carbon thermal pre-treatment temperature on the adsorption capacity has been studied, the optimum being 800 °C. An analysis of the influence of the activated carbon characteristics showed that the most important parameters are the total pore volume and the ash content.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Raso2021,

title = {Aqueous phase hydrogenolysis of glycerol over Ni/Al-Fe catalysts without external hydrogen addition},

author = {Raquel Raso and Lucía García and Joaquín Ruiz and Miriam Oliva and Jesús Arauzo},

doi = {10.1016/j.apcatb.2020.119598},

issn = {09263373},

year  = {2021},

date = {2021-04-01},

journal = {Applied Catalysis B: Environmental},

volume = {283},

pages = {119598},

publisher = {Elsevier B.V.},

abstract = {The present work studied the aqueous phase hydrogenolysis (APH) of glycerol (a by-product of biodiesel manufacturing) without external hydrogen addition to produce value-added products. A series of catalysts based on 28 molar % of Ni were prepared through co-precipitation by changing the Al/Fe molar ratio. The calcined and used catalysts were characterized by several techniques (ICP-OES, N2-physisorption, XRD, H2-TPR, NH3-TPD, FESEM and STEM). This work examines the effects of the molar ratio of Al/Fe on the physicochemical characteristics of Ni/Al-Fe catalysts and during the APH of glycerol. All the catalysts showed low carbon yields to gases and high carbon yields to liquid products, mainly 1,2-propanediol, acetol and ethylene glycol. Ni/Al3Fe1 catalyst gave the best performance in the APH of glycerol: the highest glycerol conversion (42.31 %), carbon yield to gases (6.57 %) and carbon yield to liquids (30.45%). 1,2-propanediol was the liquid product with the highest carbon selectivity (70.89%).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lozano2021,

title = {Influence of the Ni-Co/Al-Mg catalyst loading in the continuous aqueous phase reforming of the bio-oil aqueous fraction},

author = {Pablo Lozano and Ana I Simón and Lucía García and Joaquín Ruiz and Miriam Oliva and Jesús Arauzo},

url = {https://doi.org/10.3390/pr9010081},

doi = {10.3390/pr9010081},

issn = {22279717},

year  = {2021},

date = {2021-01-01},

journal = {Processes},

volume = {9},

number = {1},

pages = {1--17},

publisher = {MDPI AG},

abstract = {The effect of catalyst loading in the Aqueous Phase Reforming (APR) of bio-oil aqueous fraction has been studied with a Ni-Co/Al-Mg coprecipitated catalyst. Because of the high content of water in the bio-oil aqueous fraction, APR could be a useful process to convert this fraction into valuable products. Experiments of APR with continuous feeding of aqueous solution of acetol, butanol and acetic acid as the only compound, together with a simulated and a real aqueous fraction of bio-oil, were carried out. Liquid products in the liquid effluent of the APR model compounds were quantified and the reaction pathways were revised. The increase of catalyst loading produced an increase of gas production and a gas with higher alkanes content. Acetol was the compound with the highest reactivity while the conversion of acetic acid was very low. The presence of acetic acid in the feed caused catalyst deactivation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Raso2020,

title = {Study of Ni/Al-Fe Catalyst Stability in the Aqueous Phase Hydrogenolysis of Glycerol},

author = {Raquel Raso and Lucia García and Joaquín Ruiz and Miriam Oliva and Jesús Arauzo},

url = {https://www.mdpi.com/2073-4344/10/12/1482/htm https://www.mdpi.com/2073-4344/10/12/1482},

doi = {10.3390/CATAL10121482},

issn = {2073-4344},

year  = {2020},

date = {2020-12-01},

journal = {Catalysts 2020, Vol. 10, Page 1482},

volume = {10},

number = {12},

pages = {1482},

publisher = {Multidisciplinary Digital Publishing Institute},

abstract = {The present work studied the stability and reusability of Ni/Al-Fe catalyst in the aqueous phase hydrogenolysis of glycerol without external hydrogen addition. The catalyst based on 28 molar % of Ni with 3/1 molar ratio of Al/Fe was prepared through co-precipitation. This catalyst presented the best performance in our last study which compares several Ni/Al-Fe catalysts with different molar ratios of Al/Fe. To see the influence of the pressurized water on the physicochemical characteristics of Ni/Al-Fe catalyst, a test of up to 9 h has been carried out. Fresh and used catalysts were characterized by various techniques: X-ray Diffraction (XRD), N2-physisorption, field emission scanning electron microscopy (FESEM) and STEM. Glycerol conversion and carbon yield to gases and liquids did not vary significantly when compared at 3 h and 9 h. Furthermore, the morphology of the catalyst remains stable after continuous recycling under severe hydrothermal conditions. The nickel rich phase of the catalyst, which was determined by XRD and scanning transmission electron microscopy (STEM) techniques, showed a stable size after 9 h under reaction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}