Search

Your search keyword '"Raspolli Galletti Anna Maria"' showing total 536 results
Start Over Author "Raspolli Galletti Anna Maria"
536 results on '"Raspolli Galletti Anna Maria"'

1. Bio-additives for CI engines from one-pot alcoholysis reaction of lignocellulosic biomass: an experimental activity

Author

Raspolli Galletti Anna Maria, Caposciutti Gianluca, Pasini Gianluca, Antonelli Marco, and Frigo Stefano

Subjects
Environmental sciences, GE1-350
Abstract

In the recent years the progressive decrease in fossil petroleum resources and gradual deprivation of the environment have attracted increasing interest towards the use of biomass as renewable carbon source for the production of chemicals and transportation fuels. In particular, lignocellulosic biomass represents an abundant and inexpensive renewable resource with high carbon sequestration ability and non-polluting. In this paper, the valorisation of mixtures made of n-butanol (n-BuOH), butyl levulinate (BL) and dibutyl ether (DBE), in different percentages, as additive fuel for compression ignition (CI) internal combustion engine (ICE) was studied. These mixtures can be directly obtained from the catalytic alcoholysis reaction of the cellulosic fraction of raw and pre-treated lignocellulosic biomasses. Moreover, the possibility to recycle and reutilize the excess alcohol (n-Butanol), during the catalytic alcoholysis reaction, has been considered since it represents an opportunity to reduce the overall costs of the process. Therefore, a blend constituted only by BL and DBE has been also tested. The model mixtures were prepared by using commercial reactants, characterized by compositions analogous to those of the reaction mixtures. These model mixtures were tested as blend with Diesel fuel in a CI-ICE with the measurement of pollutant emission and performance. Results have been compared with those obtained fuelling the engine with a commercial Diesel fuel. As a whole, tests results have evidenced the potentiality of these novel blending mixtures to reduce the emissions of particulate without any significant increase in the other pollutants and negligible changes in engine power and efficiency.

Published
2020
Full Text
View/download PDF

14. In‐Depth Investigation of the Reaction Parameters Tuning the Ethyl Levulinate Synthesis from Fructose and Inulin.

Author

Fulignati, Sara, Antonetti, Claudia, Raspolli Galletti, Anna Maria, Bonaldi, Lorenzo, Ribechini, Erika, Mattonai, Marco, Licursi, Domenico, and Di Fidio, Nicola

Subjects
RENEWABLE energy transition (Government policy), RESPONSE surfaces (Statistics), CIRCULAR economy, HOMOGENEOUS catalysis, ENERGY development, INULIN
Abstract

Alkyl levulinates (ALs) are strategic compounds for the development of sustainable energy transition. In this regard, the direct alcoholysis of fructose and inulin for the selective ethyl levulinate (EL) production was investigated with a One‐Factor‐At‐a‐Time (OFAT) approach employing diluted H2SO4 as catalyst to clarify the role of the main reaction parameters (substrate and acid loadings, temperature, reaction time). The OFAT investigation on fructose ethanolysis allowed to reach the EL yield of 91.5 mol%. The inulin ethanolysis was then optimized adopting the multivariate approach based on the Response Surface Methodology (RSM), which highlighted the interplay of the reaction parameters on the selective EL production. This allowed to identify the optimal conditions to reach the highest EL yield (up to 89.3 mol%) and also those which ensured the highest EL concentration, adopting a substrate loading (14 wt%) higher than the majority ones reported in the literature according to the high gravity approach, and the lowest diethyl ether (DEE) by‐product yield. The DEE formation is scarcely investigated in the literature, but it can negatively influence the alcoholysis process, thus it was considered in this work. Moreover, the humin solid residue was deeply characterized to envisage its possible applications, under a circular economy perspective. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

26. Innovative Bioplasticizers from Residual Cynara cardunculus L. Biomass-Derived Levulinic Acid and Their Environmental Impact Assessment by LCA Methodology

Author

Ruini, Chiara, primary, Neri, Paolo, additional, Cavalaglio, Gianluca, additional, Coccia, Valentina, additional, Cotana, Franco, additional, Raspolli Galletti, Anna Maria, additional, Morselli, Davide, additional, Fabbri, Paola, additional, Ferrari, Anna Maria, additional, and Rosa, Roberto, additional

Published
2023
Full Text
View/download PDF

30. Challenges and Opportunities in the Catalytic Synthesis of Diphenolic Acid and Evaluation of Its Application Potential.

Author

Fulignati, Sara, Di Fidio, Nicola, Antonetti, Claudia, Raspolli Galletti, Anna Maria, and Licursi, Domenico

Subjects
PHENOLIC resins, HETEROGENEOUS catalysis, BISPHENOL A, ACID catalysts, BRONSTED acids, BISPHENOLS
Abstract

Diphenolic acid, or 4,4-bis(4-hydroxyphenyl)pentanoic acid, represents one of the potentially most interesting bio-products obtainable from the levulinic acid supply-chain. It represents a valuable candidate for the replacement of bisphenol A, which is strongly questioned for its toxicological issues. Diphenolic acid synthesis involves the condensation reaction between phenol and levulinic acid and requires the presence of a Brønsted acid as a catalyst. In this review, the state of the art related to the catalytic issues of its synthesis have been critically discussed, with particular attention to the heterogeneous systems, the reference benchmark being represented by the homogeneous acids. The main opportunities in the field of heterogeneous catalysis are deeply discussed, as well as the bottlenecks to be overcome to facilitate diphenolic acid production on an industrial scale. The regioselectivity of the reaction is a critical point because only the p,p′-isomer is of industrial interest; thus, several strategies aiming at the improvement of the selectivity towards this isomer are considered. The future potential of adopting alkyl levulinates, instead of levulinic acid, as starting materials for the synthesis of new classes of biopolymers, such as new epoxy and phenolic resins and polycarbonates, is also briefly considered. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

39. Niobium and Zirconium Phosphates as Green and Water-Tolerant Catalysts for the Acid-Catalyzed Valorization of Bio-Based Chemicals and Real Lignocellulosic Biomasses

Author

Antonetti, Claudia, primary, Raspolli Galletti, Anna Maria, additional, Licursi, Domenico, additional, Fulignati, Sara, additional, Di Fidio, Nicola, additional, Zanetti, Federica, additional, Monti, Andrea, additional, Tabanelli, Tommaso, additional, and Cavani, Fabrizio, additional

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results