Elena Landi
National Research Council
Composite numberMetakaolinCeramicBiomedical engineeringNuclear chemistryAdsorptionSpecific surface areaComposite materialChemistryMaterials scienceMineralogySinteringApatiteGeopolymerCompressive strengthChemical engineeringPhase (matter)Thermogravimetric analysisPorosityMicrostructure
143Publications
35H-index
5,036Citations
Publications 110
Newest
#1Paola AmmendolaH-Index: 24
#2Federica RaganatiH-Index: 20
Last. Francesco MiccioH-Index: 19
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Abstract In framework of the thermochemical energy storage (TCES) in concentrating solar power (CSP) applications, great attention is focused on the SrCO3/SrO system, which is characterized by remarkably high theoretical volumetric energy density (4 GJ m SrC O 3 - 3 ) and working temperatures (1200 °C). It has been shown that the incorporation of Al2O3 in the SrO/SrCO3 system can successfully hinder the sintering and agglomeration phenomena, thus improving the performances of the system. Aiming ...
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#1M. Boscherini (UNIBO: University of Bologna)H-Index: 1
#2F. Miccio (UNIBO: University of Bologna)H-Index: 1
Last. Matteo Minelli (UNIBO: University of Bologna)H-Index: 22
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Abstract Low temperature adsorption of carbon dioxide in solid materials is a cost-effective option for implementing decarbonization in a retrofitting plant strategy. Among several natural and artificial sorbents, geopolymer-zeolite composites represent a valid alternative owing to the affinity and synergy between zeolite and the geopolymer binder. Thermal effects are usually associated to CO2 adsorption in solids: in particular zeolites exhibit values in the range 33 to 40 kJ/mol. The occurrenc...
1 CitationsSource
#1Elettra PapaH-Index: 11
#2Elena LandiH-Index: 35
Last. Valentina MedriH-Index: 25
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Abstract Geopolymer-hydrotalcites composites have been prepared and compared to explore their use in the field of CO2 adsorption for a wide range of working temperatures and relative applications. Two commercial hydrotalcites, with different Mg:Al ratio, were tested as fillers for a geopolymer matrix up to the maximum of 37 ​wt%. A high compressive strength (25–27 ​MPa) was retained in composites at 500 ​°C, which is the temperature of hydrotalcites transformation into amorphous mixed solid oxid...
1 CitationsSource
#1Francesco MiccioH-Index: 19
#2Elettra PapaH-Index: 11
Last. Matteo MinelliH-Index: 22
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Biomass residues are often considered as a resource if conveniently converted in fuel and alternative feedstock for chemical processes, and their conversion into valuable products may occur by different pathways. This work is focused on the thermochemical conversion at moderate temperature and in steam atmosphere, a mild process in comparison to hydrothermal liquefaction, followed by extraction of soluble products in a solvent. Such process has been already applied to various residues and here e...
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#1Paola AmmendolaH-Index: 24
#2Federica RaganatiH-Index: 20
Last. Elena LandiH-Index: 35
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Abstract The reversible dissociation/carbonation of metal carbonates, per in performed in fluidized bed reactors, is one of the most promising technological solution for thermochemical energy storage in concentrating solar power plants (CSP). In this framework, the SrCO3/SrO system is receiving increasing interest due to its high energy density (4 GJ/m3) and working temperatures (up to 1200 °C). As the more investigated CaCO3/CaO couple, also SrO undergoes a dramatic drop of reactivity over mult...
4 CitationsSource
#1Valentina Medri (National Research Council)H-Index: 25
#2Elettra Papa (National Research Council)H-Index: 11
Last. Elena Landi (National Research Council)H-Index: 35
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Abstract Metakaolin-based geopolymer spheres shaped by three different dripping techniques were investigated in terms of compressive strength and dye adsorption ability. Spheres were produced by injection and solidification in polyethylene glycol (PEG) or liquid nitrogen (ice-templating) and ionotropic gelation (alginate in calcium chloride). Mechanical tests by ISO 18591 evidenced that compressive strength was strictly linked to porosity and composition of the spheres, being 12.9 MPa with 29% o...
4 CitationsSource
#1A. Natali Murri (National Research Council)H-Index: 3
#2Francesco Miccio (National Research Council)H-Index: 19
Last. Elena Landi (National Research Council)H-Index: 35
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Abstract Oxygen carriers based on geopolymer composites with enhanced thermal and mechanical stability have been synthesized and been proposed for chemical looping combustion with oxygen uncoupling. Geopolymer synthesis belongs to green chemistry and ensures chemical and mechanical properties similar to those of high temperature sintering. Suitable metal oxides, such as combinations of Cu, Mn and Fe oxides, have been used as active fillers in geopolymer matrices. Thermogravimetric analysis condu...
2 CitationsSource
#1Elettra Papa (National Research Council)H-Index: 11
#2Matteo Mor (National Research Council)H-Index: 2
Last. Valentina Medri (National Research Council)H-Index: 25
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Abstract Geopolymer beads, conceived as alternative low cost adsorbents for wastewater treatment, were shaped by a dripping technique in liquid nitrogen, through an ice-templating process. PEG600 was added as a binder to ease the process, standardizing the beads dimension. The beads were investigated in terms of morphology, microstructure and mechanical strength, following compressive tests by ISO 18591. Functional tests, to verify the adsorption capacity, were conducted using methylene blue (MB...
7 CitationsSource
#1Valentina Medri (National Research Council)H-Index: 25
#2Elettra Papa (National Research Council)H-Index: 11
Last. Elena Landi (National Research Council)H-Index: 35
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Abstract The production of porous metakaolin-based geopolymer beads was investigated using three different dripping based techniques. The processes were based on the formulation of geopolymer slurries produced using metakaolin and a potassium-disilicate activating solution, and exploiting injection and solidification method in polyethylene glycol (PEG) or liquid nitrogen and ionotropic gelation of alginate in calcium chloride. Geopolymer slurries and maturation steps were deeply investigated in ...
13 CitationsSource
This article reports research aimed at investigating agglomeration phenomena during fluidized bed thermochemical processing of olive husk biomass and their mitigation, taking into account both combustion and gasification conditions. Agglomeration is due to the presence of alkalis in fuel ash producing low-melting compounds in combination with SiO2 present in common bed materials (e.g. silica sand). The use of kaolin and fireclay as additives and in some cases as bed materials for inhibiting bed ...
3 CitationsSource