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Developing active, selective and energy-efficient heterogeneous catalysts is of paramount importance for the production of high value-added products from energy resources in a more sustainable manner. In this Special Issue of Energies, we provide a showcase of the latest progress in the development of cleaner, more efficient processes for the conversion of these feedstocks into valuable fuels, chemicals and energy. Most of the works collected are focused on the conversion of biomass which clearly reflects the paramount importance that the biorefinery concept will play in the years to come.

Technology: general issues --- biogas --- syngas production --- DRM --- Ni catalyst --- bi-metallic catalyst --- ceria-alumina --- ceria --- glycerol --- methanol --- biodiesel --- red jujube branch --- hydrothermal carbonization --- hydrochar --- energy recovery efficiency --- solid fuel --- toluene --- steam reforming --- GHSV --- S/C ratio --- coke formation --- Mo2C catalysts --- nanostructured carbon materials --- hydrodeoxygenation of guaiacol --- carbothermal hydrogen reduction --- drop-in fuels --- biomass --- bio-oil --- pyrolysis --- spark engine --- gasoline --- levulinic acid --- γ-valerolactone --- hydrogen from water --- Zn: Ni --- sepiolite --- attapulgite --- Ru nanoparticles --- activated carbon --- one-pot hydrolytic hydrogenation --- cellulose conversion --- sorbitol

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Developing active, selective and energy-efficient heterogeneous catalysts is of paramount importance for the production of high value-added products from energy resources in a more sustainable manner. In this Special Issue of Energies, we provide a showcase of the latest progress in the development of cleaner, more efficient processes for the conversion of these feedstocks into valuable fuels, chemicals and energy. Most of the works collected are focused on the conversion of biomass which clearly reflects the paramount importance that the biorefinery concept will play in the years to come.

Technology: general issues --- biogas --- syngas production --- DRM --- Ni catalyst --- bi-metallic catalyst --- ceria-alumina --- ceria --- glycerol --- methanol --- biodiesel --- red jujube branch --- hydrothermal carbonization --- hydrochar --- energy recovery efficiency --- solid fuel --- toluene --- steam reforming --- GHSV --- S/C ratio --- coke formation --- Mo2C catalysts --- nanostructured carbon materials --- hydrodeoxygenation of guaiacol --- carbothermal hydrogen reduction --- drop-in fuels --- biomass --- bio-oil --- pyrolysis --- spark engine --- gasoline --- levulinic acid --- γ-valerolactone --- hydrogen from water --- Zn: Ni --- sepiolite --- attapulgite --- Ru nanoparticles --- activated carbon --- one-pot hydrolytic hydrogenation --- cellulose conversion --- sorbitol

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Materials play a very important role in the technological development of a society. As a consequence, the continuous demand for more advanced and sophisticated applications is closely linked to the availability of innovative materials. Although aspects related to the study, the synthesis and the applications of materials are of interdisciplinary interest, in the last few years, great attention has been paid to the development of advanced materials for environmental preservation and sustainable energy technologies, such as gaseous pollutant monitoring, waste water treatment, catalysis, carbon dioxide valorization, green fuel production, energy saving, water adsorption and clean technologies. This Special Issue aims at covering the current design, synthesis and characterization of innovative advanced materials, as well as novel nanotechnologies able to offer promising solutions to the these pressing themes.

Technology: general issues --- History of engineering & technology --- anaerobic digestion --- anchovies --- biorefinery --- circular economy --- d-limonene --- granular activated carbon --- inhibition --- orange peel waste (OPW) --- hydrothermal carbonization --- hydrochar --- 5-hydroxymethylfurfural (5-HMF) --- furfural (FU) --- levulinic acid (LA) --- nanomaterials --- MOS --- resistive sensor --- tin oxide --- fermentation --- diacetyl --- lithium chloride hydrate --- composite foam --- deliquescence --- thermochemical storage --- in situ characterization --- ionic liquids --- heat storage --- thermal stability --- HRMAS NMR --- FTIR --- zinc oxide --- gas sensor --- hexanal --- 1-pentanol --- 1-octen-3-ol --- MOX --- plasmonic nanoparticles --- silicon solar cell --- graphene --- short-circuit current density --- open-circuit voltage --- power conversion efficiency --- n/a

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Dear Colleagues,All types of biomass, and their waste, comprised one the pillars of the preindustrial,pre-fossil fuel, agriculture-based economies of the past. Traditionalpractices of biomass waste management were applied, but not necessarily in asophisticated and efficient way, and included everything from agricultural activitiesto food production, animal feed, natural fiber separation, and processingof forest wood. The modern bioeconomy sector, however, includes new circulareconomy energy and materials streams of added-value products, such asgaseous, liquid and solid biofuels and bioenergy generation routes, and biocharproduction, along with all the previously mentioned traditional products emergingfrom the bioeconomy.This Special Issue includes some of the latest bioenergy and biochar advancementsand their incorporation into a bioeconomy in transition. It focuses onnature, properties, upgrading, and bioenergy generation processes from all typesof biomass waste and biochars originating from biomass waste. The multidisciplinarityof bioenergy and biochar research is evident throughout the SpecialIssue, highlighting the highly variable and tunable processes involved inbiomass handling, pre-processing, converting to biochar, and recovering energy.Dr. Dimitrios KalderisGuest EditorDr. Vasiliki Skoulouco-Guest Editor

ethanol --- lignocellulosic biomass --- life cycle assessment --- GHG emissions --- political incentives --- economic performance --- amino acid wastes --- biofuels --- microbial lipids --- Rhodosporidium toruloides --- two-stage culture --- fixed bed --- pyrolysis yield --- temperature --- coconut shell --- characterization --- SEM --- Mitigation of CO2-equiv. --- nutrient release --- rice paddy water and soil system --- slow-release fertilizer --- coconut wastes --- bioenergy resource --- pollutant emissions --- calorific value --- biocharing --- microalgae --- anaerobic digestion --- biogas --- respirometric reactors --- APSIM sugarcane model --- energy potential --- marginal land --- sensitivity analysis --- hydrochar --- hydrothermal carbonization --- CiteSpace --- scientometric analysis --- artificial neural network --- fly ash --- biomass combustion --- fluidized bed boilers --- acute phytotoxicity test --- mineral fertilizer --- BCR sequential extraction --- metal speciation --- starch --- biochar --- coffee waste --- polycaprolactone --- bioplastics --- biodegradation --- fermentable sugar --- enzymatic hydrolysis

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Tannins are a family of versatile, natural phenolic biomolecules whose key role is to protect plants against insects and fungi. They are also valuable in use for humans. We show tannins' antioxidant and antibacterial properties, in addition to their potential application in the food industry. We prove the accessibility of condensed tannins to a wide range of potential applications, including NH3 neutralizer, the building block of numerous porous materials, such as foams, organic, and carbon gels. Finally, they are known as wood adhesives, heavy metal scavengers, and corrosion inhibitors. With this book, we want to present the most promising perspectives of tannin.

tannins --- applications --- new applications --- drawbacks --- advantages --- tannin --- polyphenolic molecules --- sol-gel --- organic gel --- carbon gel --- hydrothermal carbonization --- porous materials --- pore structure --- biopolymer --- low-cost --- human serum albumin (HSA) --- fatty acid --- polyphenol --- protein conformation --- protein aggregation --- Förster resonance energy transfer (FRET) --- blue honeysuckle berry --- apple --- anthocyanins --- polyphenols --- antioxidant --- juice --- grape seed extract --- cotton --- antibacterial --- UV protection --- flavanols --- condensed tannin --- Vitis vinifera --- microwave-extraction --- glucosidase --- cytotoxicity --- greenhouse gas --- NH3 --- tannin-furanic foam --- liquid manure --- natural polyphenol --- agriculture --- emission reduction --- n/a --- Förster resonance energy transfer (FRET)