Peeter Paaver
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View article: Pyrolytic Transformation of Zn-TAL Metal–Organic Framework into Hollow Zn–N–C Spheres for Improved Oxygen Reduction Reaction Catalysis
Pyrolytic Transformation of Zn-TAL Metal–Organic Framework into Hollow Zn–N–C Spheres for Improved Oxygen Reduction Reaction Catalysis Open
Metal-organic frameworks (MOFs) are promising precursors for creating metal-nitrogen-carbon (M-N-C) electrocatalysts with high performance, though maintaining their structure during pyrolysis is challenging. This study examines the transfo…
Ultrasound effect on a biorefinery lignin-cellulose mixture Open
Forest biorefineries provide multiple new avenues for applied research. The main concept lies in the malleability of the processes and their stepwise organization. The core element of the biorefinery concept addressed in the present study …
Phase transformation and strength of hydrated circulating fluidised bed combustion ash sediment in an open environment over 15 years: implications for the long-term stability of ash waste plateaus Open
Low-temperature circulating fluidised bed combustion (CFBC) of oil shale results in Ca-rich ashes with low pozzolanic properties, raising concerns regarding the long-term stability of ash depositories. This paper presents findings from a l…
Influence of Chromium Carbide-Derived Carbon Support and Ceria Nanocrystals on Pt–CeO<sub>2</sub>/C Catalysts for Fuel Cell Applications Open
The influence of different synthesis parameters on CeO 2 and Pt nanoparticle (NP) deposition on Ketjenblack carbon (C(KB)) was examined. The Pt NP diameter (3.1–4.1 nm) was not influenced by CeO 2 synthesis parameters. The CeO 2 NPs synthe…
View article: Mechanosynthesis of a bifunctional FeNi–N–C oxygen electrocatalyst <i>via</i> facile mixed-phase templating and preheating-pyrolysis
Mechanosynthesis of a bifunctional FeNi–N–C oxygen electrocatalyst <i>via</i> facile mixed-phase templating and preheating-pyrolysis Open
This study presents a cost-effective and sustainable approach to create a bifunctional FeNi–N–C electrocatalyst using template-assisted mechanosynthesis.
Design of High Volume CFBC Fly Ash Based Calcium Sulphoaluminate Type Binder in Mixtures with Ordinary Portland Cement Open
Growing concerns on global industrial greenhouse gas emissions have boosted research for developing alternative, less CO2 intensive binders for partial to complete replacement of ordinary Portland cement (OPC) clinker. Unlike slag and pozz…
Mechanical Activation of the Ca-Rich Circulating Fluidized Bed Combustion Fly Ash: Development of an Alternative Binder System Open
Mechanical activation of the calcium-rich fly ash formed in circulating fluidized bed combustion (CFBC) boilers was investigated to enhance the compressive strength performance of the pastes. We studied the effect of the activation on the …
Evaluation of New Applications of Oil Shale Ashes in Building Materials Open
Achieving sustainable zero-waste and carbon neutral solutions that contribute to a circular economy is critically important for the long-term prosperity and continuity of traditional carbon-based energy industries. The Estonian oil shale (…
Geochemical study of stable carbon and oxygen isotopes in landfilled Ca-rich oil shale ash Open
The Estonian energy industry relies on local calcareous oil shale that is used to produce the majority of the countryâs electricity, but the shale is also used for shale oil retorting. The solid residues remaining after combustion are up…
GEOPOLYMERIC POTENTIAL OF THE ESTONIAN OIL SHALE SOLID RESIDUES: PETROTER SOLID HEAT CARRIER RETORTING ASH; pp. 373–392 Open
In this paper, the geopolymerization of the solid heat carrier (SHC) ash waste produced at Petroter shale oil plants, Viru Keemia Grupp (VKG), Estonia was studied. Different mixtures were prepared to study and evaluate the potential use of…