Gerardo Santori

Gerardo Santori

Universidad Nacional de La Plata

H-index: 22

Latin America-Argentina

About Gerardo Santori

Gerardo Santori, With an exceptional h-index of 22 and a recent h-index of 12 (since 2020), a distinguished researcher at Universidad Nacional de La Plata, specializes in the field of Producción, Catálisis, Biomasa.

His recent articles reflect a diverse array of research interests and contributions to the field:

Heterogeneous catalysts for glycerol biorefineries: hydrogenolysis to 1, 2-propylene glycol

Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

Glycerol Hydrogenolysis to Bio-Propanol: Catalytic Activity and Kinetic Model for Ni/C Modified with Al(H2PO4)3

Cetalización de glicerol con acetona, catalizada por Sba-15 modificada con grupos sulfónicos

Transformations of Glycerol into High-Value-Added Chemical Products: Ketalization and Esterification Reactions

Crude glycerol hydrogenolysis to bio-propylene glycol: effect of its impurities on activity, selectivity and stability

Silica-resin-bentonite nanocomposite and its application in catalysis

Activated bentonite nanocomposite for the synthesis of solketal from glycerol in the liquid phase

Gerardo Santori Information

University

Universidad Nacional de La Plata

Position

Profesor Adjunto Producción I y Trabajo Final Ingeniería Industrial Facultad de Ingenieria

Citations(all)

1733

Citations(since 2020)

448

Cited By

1473

hIndex(all)

22

hIndex(since 2020)

12

i10Index(all)

27

i10Index(since 2020)

16

Email

University Profile Page

Universidad Nacional de La Plata

Gerardo Santori Skills & Research Interests

Producción

Catálisis

Biomasa

Top articles of Gerardo Santori

Heterogeneous catalysts for glycerol biorefineries: hydrogenolysis to 1, 2-propylene glycol

Authors

Martín N Gatti,Federico M Perez,Gerardo F Santori,Nora N Nichio,Francisco Pompeo

Published Date

2023/5/5

Research on the use of biomass resources for the generation of energy and chemical compounds is of great interest worldwide. The development and growth of the biodiesel industry has led to a parallel market for the supply of glycerol, its main by-product. Its wide availability and relatively low cost as a raw material make glycerol a basic component for obtaining various chemical products and allows for the development of a biorefinery around biodiesel plants, through the technological integration of different production processes. This work proposes a review of one of the reactions of interest in the biorefinery environment: the hydrogenolysis of glycerol to 1,2-propylene glycol. The article reviews more than 300 references, covering literature from about 20 years, focusing on the heterogeneous catalysts used for the production of glycol. In this sense, from about 175 catalysts, between bulk and supported ones, were revised and discussed critically, based on noble metals, such as Ru, Pt, Pd, and non-noble metals as Cu, Ni, Co, both in liquid (2–10 MPa, 120–260 °C) and vapor phase (0.1 MPa, 200–300 °C). Then, the effect of the main operational and decision variables, such as temperature, pressure, catalyst/glycerol mass ratio, space velocity, and H2 flow, are discussed, depending on the reactors employed. Finally, the formulation of several kinetic models and stability studies are presented, discussing the main deactivation mechanisms of the catalytic systems such as coking, leaching, and sintering, and the presence of impurities in the glycerol feed. It is expected that this work will serve as a tool for the development of more efficient catalytic …

Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

Authors

Julieta L Cerioni,Maria E Vallejos,Fernando E Felissia,María C Area,Nora N Nichio,Gerardo F Santori

Journal

Chemical Industry & Chemical Engineering Quarterly

Published Date

2023

This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatment spent liquors using a sulfonated resin. Besides, results were compared with those obtained by a conventional route using sulfuric acid as a homogeneous catalyst. Heterogeneous catalysis is suitable for the hydrolysis of sugarcane bagasse hydrothermal liquors under mild conditions (100 C and 6 h). The obtained maximum xylose yield was 82% due to furfural formation, which causes a xylose selectivity drop. The hydrogenation of this xylose-rich liquor at 100 C and 3 MPa of hydrogen pressure employing a supported Ni/γ-Al 2 O 3 produced the total conversion of xylose with a selectivity towards xylitol of 100% by using a catalyst to xylose mass ratio of 0.5. Heterogeneous catalysis in a two-step route (hydrolysis and hydrogenation) constitutes an outstanding alternative to producing xylitol from sugarcane bagasse hydrothermal spent liquors since materials can be easily separated and reused in several reaction cycles.

Glycerol Hydrogenolysis to Bio-Propanol: Catalytic Activity and Kinetic Model for Ni/C Modified with Al(H2PO4)3

Authors

Martín N Gatti,Federico M Perez,Gerardo F Santori,Francisco Pompeo

Journal

Reactions

Published Date

2023/11/5

The aim of the present research is to investigate the effect of different operation variables in the hydrogenolysis of glycerol to 1-propanol and to develop a simple kinetic model useful for the design of the reactor. For this purpose, a carbon-based composite was impregnated with 4 wt.% of Al(H2PO4)3 (CPAl) and used as a support to prepare a Ni catalyst. The support and the catalyst were characterized by BET, XRD, NMR, potentiometric titration, isopropanol decomposition reaction, TEM and TPR analysis. The catalytic tests were carried out at 220–260 °C and 0.5–4 MPa of H2 initial pressure varying the glycerol concentration in aqueous solutions between 30 and 80 wt.%. The presence of aluminum phosphates in the Ni/CPAl catalyst moderates the surface acidity and the formation of Ni2P leads to a high selectivity towards 1-propanol. In this sense, the Ni/CPAl catalyst showed total glycerol conversion and 74% selectivity towards 1-propanol at 260 °C and 2 MPa of H2 initial pressure using 30 wt.% glycerol aqueous solution and 8 h of reaction time. A slight increase in particle size from 10 to 12 nm was observed after a first reaction cycle, but no changes in acidity and structure were observed. Based on these results, a power-law kinetic model was proposed. For glycerol consumption, partial orders of 0.07, 0.68 and −0.98 were determined with respect to glycerol, H2 and water, and an apparent activation energy of 89 kJ mol−1 was estimated. The results obtained indicate that the model fits the experimental concentration values well and can predict them with an average error of less than 7%.

Cetalización de glicerol con acetona, catalizada por Sba-15 modificada con grupos sulfónicos

Authors

German P Benedictto,Federico M Perez,Francisco Pompeo,Gerardo Santori,Maria Sol Legnoverde

Journal

Jornadas en Ciencias Aplicadas" Dr. Jorge Ronco"

Published Date

2023/10/9

En el presente trabajo se sintetizaron sílices mesoporosas SBA-15 funcionalizadas con grupos sulfónicos por el método de co-condensación, con el objetivo de modificar sus propiedades ácidas y texturales, y ser evaluadas como catalizadores en la cetalización de glicerol con acetona. Los resultados demostraron que la funcionalización reduce el área BET, el volumen y el tamaño de poro. No obstante, para una cantidad de funcionalizante por encima de 15%, las propiedades texturales no se ven fuertemente modificadas. Además, conforme se aumenta la cantidad de precursor, la densidad, cantidad y fuerza media de los sitios aumenta, lo que conlleva también a un aumento de la actividad de los sólidos. Los mejores resultados se obtuvieron para un contenido del 22, 5%, por lo que este sólido fue sometido a sucesivos ciclos de reacción para evaluar su estabilidad, mostrando una significativa pérdida de actividad luego de tres usos de reacción.

Transformations of Glycerol into High-Value-Added Chemical Products: Ketalization and Esterification Reactions

Authors

Federico M Perez,Martin N Gatti,Gerardo F Santori,Francisco Pompeo

Published Date

2023/10/8

Biomass allows us to obtain energy and high-value-added compounds through the use of different physical and chemical processes. The glycerol obtained as a by-product in the synthesis of biodiesel is considered a biomass compound that has the potential to be used as a raw material to obtain different chemical products for industry. The development and growth of the biodiesel industry allows for the projection of glycerol biorefineries around these plants that efficiently and sustainably integrate the biodiesel production process together with the glycerol transformation processes. This work presents a review of the ketalization and esterification of glycerol to obtain solketal and acetylglycerols, which are considered products of high added value for the chemical and fuel industry. First, the general aspects and mechanisms of both reactions are presented, as well as the related chemical equilibrium concepts. Subsequently, the catalysts employed are described, classifying them according to their catalytic nature (zeolites, carbons, exchange resins, etc.). The reaction conditions used are also described, and the best results for each catalytic system are presented. In addition, stability studies and the main deactivation mechanisms are discussed. Finally, the work presents the kinetic models that have been formulated to date for some of these systems. It is expected that this review work will serve as a tool for the advancement of studies on the ketalization and esterification reactions that allow for the projection of biorefineries based on glycerol as a raw material.

Crude glycerol hydrogenolysis to bio-propylene glycol: effect of its impurities on activity, selectivity and stability

Authors

Martín N Gatti,Francisco Pompeo,Nora N Nichio,Gerardo F Santori

Journal

Processes

Published Date

2023/6/6

The wide availability of crude glycerol and its low market price make this by-product of the biodiesel industry a promising raw material for obtaining high-value-added products through catalytic conversion processes. This work studied the effect of the composition of different industrial crude glycerol samples on the catalytic hydrogenolysis to 1,2-propylene glycol. A nickel catalyst supported on a silica–carbon composite was employed with this purpose. This catalyst proved to be active, selective to 1,2-propylene glycol and stable in the glycerol hydrogenolysis reaction in the liquid phase when analytical glycerol (99% purity) was employed. In order to determine the effect of crude glycerol composition on the activity, selectivity and stability of this catalyst, industrial crude glycerol samples were characterized by identifying and quantifying the impurities present in them (methanol, NaOH, NaCl and NaCOOH). Reaction tests were carried out with aqueous solutions of analytical glycerol, adding different impurities one by one in their respective concentration range. These results allowed for calculating activity factors starting from the ratio between the rate of glycerol consumption in the presence and in the absence of impurities. Finally, catalyst performance was evaluated employing the industrial crude glycerol samples, and a kinetic model based on the power law was proposed, which fitted the experimental results taking into account the effect of glycerol impurities. The fit allowed for predicting conversion values with an average error below 8%.

Silica-resin-bentonite nanocomposite and its application in catalysis

Authors

Federico M Perez,Gerardo F Santori,Francisco Pompeo,Nora N Nichio

Journal

Minerals

Published Date

2022/11/23

Bentonites are natural clays found in abundance in deposits all over the planet and possess certain properties that make them interesting for various industrial applications. Through their activation or acid treatment, they can be used as catalysts in several reactions of interest. However, these materials form colloidal suspensions in water or in aqueous solutions, which makes their separation and recovery difficult and prevents their implementation on an industrial scale. To overcome these limitations, in the present work, a silica-resin-bentonite composite material was synthesized and activated with HNO3. The activated solids were characterized and evaluated in the catalytic reaction of solketal synthesis from glycerol and acetone. The best results were obtained for a composite containing 47 wt.% acidified bentonite at 90 °C, with a HNO3 concentration of 0.5 mol L−1, which was attributed to both its acid site density—3.9 mmol per gram of bentonite—and the acidic strength of these sites.

Activated bentonite nanocomposite for the synthesis of solketal from glycerol in the liquid phase

Authors

Federico M Perez,Celeste Legarto,María B Lombardi,Gerardo F Santori,Francisco Pompeo,Nora N Nichio

Journal

Catalysts

Published Date

2022/6/20

Activated bentonites are low-cost acid catalysts used in several reactions. However, their application at an industrial scale is affected by the formation of colloidal suspensions when these bentonites are in aqueous solutions. In order to overcome these limitations, this work proposes obtaining a catalyst based on a composite containing natural bentonite within a silica–resin structure, which allows separating and re-utilizing the catalyst more easily and without centrifugal filtration requirements. By means of characterization techniques, the present study determined that the activated bentonite composite presented a total specific surface area of ~360 m2 g−1, ~4 mmol of acid sites per gram of bentonite, and sites with strong acid strength, all of which bestowed activity and selectivity in the solketal synthesis reaction from glycerol and acetone, reaching equilibrium conversion within a short reaction time. Furthermore, the present work developed a Langmuir–Hinshelwood–Hougen–Watson kinetic model, achieving an activation energy of 50.3 ± 3.6 kJ mol−1 and a pre-exponential factor of 6.4 × 106 mol g−1 L−1 s−1, which are necessary for reactor design.

Ni-supported catalysts on mesoporous carbon modified by Al (H2PO4) 3 to obtain 1-propanol

Authors

Martin N Gatti,Martín D Mizrahi,Jose M Ramallo-Lopez,Francisco Pompeo,Gerardo F Santori,Nora N Nichio

Journal

Catalysis Today

Published Date

2021/7/15

The aim of this work was to investigate the catalytic properties of nickel over a carbon-based support modified with phosphorus for the hydrogenolysis of glycerol to obtain 1-propanol. For this, a series of nickel phosphide catalysts with different compositions were prepared employing Al(H2PO4)3 and NiCl2 supported on mesoporous carbon and characterized by N2 adsorption-desorption, acid-base properties measurements, TEM, XRD and XAFS analysis. These Ni catalysts presented different phases (NixPy, NiPOx, AlPOx), responsible of the increase in surface acidity, which depended on the Al(H2PO4)3 content. For Al(H2PO4)3 contents between 4 and 10 wt.%, an increase in surface acidity occurs that favors both the conversion and the selectivity of glycerol towards 1-propanol. These results show that the presence of the phosphates is necessary to reach high levels of catalytic activity. However, for Al(H2PO4 …

Bio-propanol a partir de glicerol

Authors

Martín Nicolás Gatti,Gerardo Fabián Santori,Francisco Pompeo,Nora Nancy Nichio

Journal

Ciencias Aplicadas

Published Date

2021

El objetivo de este trabajo es alcanzar alto rendimiento a 1-propanol en la hidrogenólisis de glicerol crudo en fase líquida empleando catalizadores de níquel como una alternativa al uso de metales nobles. En este sentido, fueron estudiados y caracterizados dos catalizadores de níquel, soportados en alúmina (γ-Al2O3) y en un composito carbonoso impregnado con fósforo (CS-P), para determinar sus propiedades ácidas y fases metálicas.

Bio-propanol a partir de glicerol: Reacción en dos etapas empleando catalizadores de níquel

Authors

Martin N Gatti,Gerardo F Santori,Francisco Pompeo,Nora N Nicchio

Journal

Jornadas en Ciencias Aplicadas" Dr. Jorge Ronco"

Published Date

2021/12/17

El objetivo de este trabajo es alcanzar alto rendimiento a 1-propanol en la hidrogenólisis de glicerol crudo en fase líquida empleando catalizadores de níquel como una alternativa al uso de metales nobles. En este sentido, fueron estudiados y caracterizados dos catalizadores de níquel, soportados en alúmina (γ-Al2O3) y en un composito carbonoso impregnado con fósforo (CS-P), para determinar sus propiedades ácidas y fases metálicas.

High yield to 1-propanol from crude glycerol using two reaction steps with Ni catalysts

Authors

Martín N Gatti,Julieta L Cerioni,Francisco Pompeo,Gerardo F Santori,Nora N Nichio

Journal

Catalysts

Published Date

2020/6/2

The objective of the present work is to achieve high yield to 1-propanol (1-POH) by crude glycerol hydrogenolysis in liquid phase and find an alternative to the use of noble metals by employing Ni catalysts. Two Ni catalysts with different supports, alumina (γ-Al2O3), and a phosphorous-impregnated carbon composite (CS-P) were studied and characterized in order to determine their acid properties and metallic phases. With the Ni/γ-Al2O3 catalyst, which presented small particles of metallic Ni interacting with the acid sites of the support, it was possible to obtain a complete conversion of crude glycerol with high selectivity towards 1,2-propylene glycol (1,2 PG) (87%) at 220 °C whereas with the Ni/CS-P catalyst, the presence of AlPOx species and the Ni2P metallic phase supplied acidity to the catalyst, which promoted the C-O bond cleavage reaction of the secondary carbon of 1,2 PG to obtain 1-POH with very high selectivity (71%) at 260 °C. It was found that the employment of two consecutive reaction stages (first with Ni/ γ-Al2O3 at 220 °C and then with Ni/CS-P at 260 °C) allows reaching levels of selectivity and a yield to 1-POH (79%) comparable to noble metal-based catalysts.

Catalizadores metálicos soportados para la hidrogenólisis de compuestos provenientes de biomasa

Authors

Julieta Lucia Cerioni

Published Date

2020

Los materiales lignocelulósicos constituyen uno de los residuos más abundantes de la biomasa y han ganado gran interés en los últimos años, dado que su uso como materia prima en biorrefinerías podría dar origen a la obtención no solo de combustibles y energía, sino productos de alto valor agregado. En particular, el bagazo de caña de azúcar presenta alto contenido de xilanos, por lo que tiene un enorme potencial para su uso en la industria. El 97% del total de la producción de caña de azúcar de Argentina, se centra en las provincias de Tucumán, Jujuy y Salta, distribuyéndose el resto entre Santa Fe y Misiones. En el año 2017, según datos del Ministerio de Hacienda, Argentina produjo el 1,2% del total mundial de caña de azúcar, lo que representa una producción de alrededor de 19 millones de toneladas. Aproximadamente el 30% de la caña de azúcar se transforma en bagazo, que está compuesto por celulosa (35-43%), hemicelulosa (25-32%), lignina (21-23%), y compuestos orgánicos e inorgánicos solubles en pequeña proporción, llamados extractivos (2-11%). Esta complejidad estructural hace que sean necesarios pretratamientos para poder extraer los componentes principales. En primer lugar, se lleva a cabo un pretratamiento de autohidrólisis, en medio acuoso, que permite la desagregación de los complejos lignina-carbohidrato, alterando las propiedades físicas de la fibra y facilitando la extracción de celulosa amorfa y hemicelulosas, además de obtener un pequeño porcentaje de oligo- y monosacáridos provenientes de la hidrólisis de estos polímeros. También, una pequeña proporción de la lignina es degradada en …

See List of Professors in Gerardo Santori University(Universidad Nacional de La Plata)

Gerardo Santori FAQs

What is Gerardo Santori's h-index at Universidad Nacional de La Plata?

The h-index of Gerardo Santori has been 12 since 2020 and 22 in total.

What are Gerardo Santori's top articles?

The articles with the titles of

Heterogeneous catalysts for glycerol biorefineries: hydrogenolysis to 1, 2-propylene glycol

Obtaining xylitol by hydrolysis-hydrogenation of liquors derived from sugarcane bagasse

Glycerol Hydrogenolysis to Bio-Propanol: Catalytic Activity and Kinetic Model for Ni/C Modified with Al(H2PO4)3

Cetalización de glicerol con acetona, catalizada por Sba-15 modificada con grupos sulfónicos

Transformations of Glycerol into High-Value-Added Chemical Products: Ketalization and Esterification Reactions

Crude glycerol hydrogenolysis to bio-propylene glycol: effect of its impurities on activity, selectivity and stability

Silica-resin-bentonite nanocomposite and its application in catalysis

Activated bentonite nanocomposite for the synthesis of solketal from glycerol in the liquid phase

...

are the top articles of Gerardo Santori at Universidad Nacional de La Plata.

What are Gerardo Santori's research interests?

The research interests of Gerardo Santori are: Producción, Catálisis, Biomasa

What is Gerardo Santori's total number of citations?

Gerardo Santori has 1,733 citations in total.

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