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The pelletization of MgO-based sorbents is necessary before implementing intermediate temperature CO2 capture for industrial applications. In the current work, MgO-based sorbent pellets were prepared using an extrusion–spheronization method, with the aim of achieving an effective granulation method for MgO sorbents. Another objective of this investigation is attempting to find out the differences...
One of the most promising alternatives to the use of liquid amines and pressure swing adsorwption (PSA) for H2 production and CO2 capture in pre-combustion processes is the so called sorption-enhanced water gas shift reaction concept (SEWGS). This study presents the performance in SEWGS of two sorbents, a K-promoted hydrotalcite with Mg/Al ratio=2, which based on our previous work was selected as...
Mixed oxides of Mn-Fe have been identified as suitable materials for Chemical Looping Combustion (CLC) with solid fuels both via in-situ Gasification Chemical Looping Combustion (iG-CLC) and Chemical Looping with Oxygen Uncoupling (CLOU) processes. These materials show the property of react with gaseous fuels as well as release oxygen under given conditions, while cheap metals are used. In addition,...
The Calcium Looping (CaL) process, based on the cyclic carbonation/calcination of CaO, has emerged in the last years as a potentially low cost technique for CO2 capture at reduced energy penalty. In the present work, natural limestone and dolomite have been pretreated with diluted acetic acid to obtain Ca and Ca-Mg mixed acetates, whose CO2 capture performance has been tested at CaL conditions that...
The membrane reactor is a promising device to produce pure hydrogen and enrich CO2 from syngas. To figure out the detailed reaction phenomena of high-temperature water gas shift reaction (WGSR) in a Pd-based membrane reactor, a computational fluid dynamics (CFD) model is developed to simulate the chemical reaction where the feed gas temperature and steam-to-CO molar ratio (S/C ratio) are in the ranges...
Sorption enhanced chemical looping steam reforming of methane (SE-CLSR) relies on the exothermicity of both a metal catalyst’s oxidation and the in situ CO2 capture by carbonation onto a solid sorbent to provide the heat demand of hydrogen (H2) production by steam reforming while generating a nearly pure H2 product. A brief thermodynamic analysis to study the main features of the SE-CLSR process is...
Traditional chemical looping technologies utilize solid oxygen carriers and has some disadvantages, especially when solid fuels like coal are used. In this work, a novel chemical looping process using gaseous metal oxide as oxygen carrier was proposed. The reaction of activated charcoal with gas-phase MoO3 was studied for the first time. The experiments were conducted isothermally at different temperatures...
Oxy fuel IGCC is one of the promising option for reconciling environment and efficiency in power generation from coal that is expected to achieve thermal efficiency of 44% LHV and 99% of CO2 capturing ratio. Dry syngas cleaning technologies for halide and sulfur are essential for realizing the power plant. The dry desulfurization process will use honeycomb shaped sorbent in fixed bed reactors in actual...
In this work, a CO2 sorbent was prepared by immobilizing tetraethylenepentamine (TEPA) onto modified carbon nanotubes. Modification of carbon nanotubes (CNTs) using a KOH reagent was done to increase the surface area and pore volume of the CNTs. The prepared sorbents were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM),...
The removing CO2 from fossil fuel based power plants has got increased interest due to environmental reasons. CO2 absorption by chemical solvents is an attractive and commercial applicable CO2 capture technology.In that field ENEA, together with Sotacarbo, is developing different activities on their pilot plants to test the use of gasification technologies for the combined production of hydrogen and...
High redox reactivity as well as sufficient physical durability of the oxygen carrier (OC) is of critical importance for the successful implementation of chemical looping processes. In this work, CuO@TiO2-Al2O3 OC with hierarchical structure, which is a kind of CuO-rich, Al2O3-supported and TiO2-stablized ternary combined metal oxides system, was prepared by the self-assembly template combustion synthesis...
The carbonate looping (CaL) process is an efficient post-combustion carbon capture technology to reduce the amount of CO2 released by fossil fuelled power and industrial plants. This work presents the results gained in long-term pilot tests performed in a 1MWth CaL pilot plant at Technische Universität Darmstadt. The experimental data were obtained from continuous operation under realistic CaL process...
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