A5085197921- Chemical Looping and Thermochemical Processes
- Carbon Dioxide Capture Technologies
- Catalytic Processes in Materials Science
- Industrial Gas Emission Control
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Zeolite Catalysis and Synthesis
- Adsorption and Cooling Systems
- Electrochemical Analysis and Applications
- Extraction and Separation Processes
- Fuel Cells and Related Materials
- Advancements in Solid Oxide Fuel Cells
- Ionic liquids properties and applications
- Advanced battery technologies research
- CO2 Sequestration and Geologic Interactions
- Thermal Expansion and Ionic Conductivity
- MXene and MAX Phase Materials
- Pigment Synthesis and Properties
- Layered Double Hydroxides Synthesis and Applications
- Chemical and Physical Properties in Aqueous Solutions
- Oxidative Organic Chemistry Reactions
- Thermal and Kinetic Analysis
- Catalysis and Hydrodesulfurization Studies
- Copper-based nanomaterials and applications
ETH Zurich
2015-2024
Board of the Swiss Federal Institutes of Technology
2021
Charles Humbert 8
2020
University of Cambridge
2010
University of Zielona Góra
2009
Bydgoszcz University of Science and Technology
2004-2006
United States Department of Agriculture
2004
Two-dimensional (2D) carbides, nitrides, and carbonitrides known as MXenes are emerging materials with a wealth of useful applications. However, the range metals capable forming stable is limited mostly to early transition groups 3-6, making exploration properties inherent mid or late metal very challenging. To circumvent inaccessibility MXene phases derived from mid-to-late metals, we have developed synthetic strategy that allows incorporation such sites into host matrix. Here, report...
Calcium looping, a CO2 capture technique, may offer mid-term if not near-term solution to mitigate climate change, triggered by the yet increasing anthropogenic emissions. A key requirement for economic operation of calcium looping is availability highly effective CaO-based sorbents. Here we report facile synthesis route that yields hollow, MgO-stabilized, CaO microspheres featuring porous multishelled morphologies. As thermal stabilizer, MgO minimized sintering-induced decay sorbents'...
CO2 capture and storage is a promising concept to reduce anthropogenic emissions. The most established technology for capturing relies on amine scrubbing that is, however, associated with high costs. Technoeconomic studies show using CaO as high-temperature sorbent can significantly the costs of capture. A serious disadvantage derived from earth-abundant precursors, e.g., limestone, rapid, sintering-induced decay its cyclic uptake. Here, template-assisted hydrothermal approach develop...
Monitoring the spontaneous reconstruction of surface metal oxides under electrocatalytic reaction conditions is critical to identifying active sites and establishing structure–activity relationships. Here, we report on a self-terminated Ruddlesden–Popper lanthanum nickel oxide (La2NiO4+δ) that occurs spontaneously during with alkaline electrolyte species. Using combination high-resolution scanning transmission electron microscopy (HR-STEM), surface-sensitive X-ray photoelectron spectroscopy...
Sorbent-enhanced steam methane reforming (SE-SMR) is an emerging technology for the production of high-purity hydrogen from hydrocarbons with in situ CO2 capture. Here, SE-SMR was studied using a mixture containing Ni-hydrotalcite-derived catalyst and synthetic, Ca-based, calcium aluminate supported sorbent. The fresh cycled materials were characterized N2 physisorption, X-ray diffraction, scanning transmission electron microscopy. combination Ni-hydrotalcite synthetic sorbent produced...
A bifunctional catalyst for the sorbent-enhanced steam methane reforming (SE-SMR) reaction was derived from a hydrotalcite-based precursor synthesized via coprecipitation technique. The material contained both Ni and Ca-based CO2 sorbent characterized using X-ray diffraction, H2 chemisorption, N2 physisorption, transmission electron microscopy, temperature-programmed reduction. Reduction of calcined hydrotalcite converted (Al:Ca:Mg:Ni)Ox mixed oxide into nickel CaO particles supported on an...
The reaction of CaO with CO2 is a promising approach for separating from hot flue gases. main issue associated the use naturally occurring CaCO3, that is, limestone, rapid decay its capture capacity over repeated cycles carbonation and calcination. Interestingly, dolomite, equimolar mixture CaCO3 MgCO3, possesses uptake remains almost constant cycle number. However, owing to large quantity MgCO3 in total comparatively small. Here, we report development synthetic Ca-rich dolomite using...
In this work we report the development of a Ca-based, Al2O3-stabilized sorbent using sol–gel technique. The CO2 uptake synthetic materials as function carbonation and calcination temperature partial pressure was critically assessed. addition, performing reactions in gas-fluidized bed allowed attrition characteristics new material to be investigated. After 30 cycles conducted fluidized bed, best 0.31 g CO2/g sorbent, which is 60% higher than that measured for Rheinkalk limestone. A detailed...
We experimentally demonstrate the feasibility of a novel process that integrates chemical looping combustion into calcium scheme. Using co-precipitation technique, calcium-based, copper-functionalised CO2 sorbents were developed. The material synthesized possessed stable uptake and oxygen carrying capacities, making it an attractive candidate for modified process.
Composite particles with different mass ratios of Fe2O3 and Al2O3 were prepared using a sol−gel method examined for use in chemical looping combustion through repeated reduction oxidation cycles packed bed reactor at 850 °C. Unlike traditional which reduces an oxygen carrier methane oxidizes it air, the reducing gas here was mixture CO N2. Oxidation performed steam N2 to produce H2, followed by air some cases. The results as follows: (1) For FeO phase, unsupported gave stable conversions...
Here, we report the development of novel, highly effective CaO‐based CO 2 sorbents via a well‐scalable and economic synthesis technique, viz. re‐crystallization calcium magnesium acetates in organic solvents. We successfully synthesized material that possessed an excellent cyclic uptake (10.71 mmol(CO ) g(sorbent) −1 after 10 cycles), even under harsh, but practically relevant, regeneration conditions. To obtain such high uptake, it was found to be crucial mix active component, CaO, Tammann...
Abstract An option for reducing the release of greenhouse gases into atmosphere is implementation CO 2 capture and storage (CCS) technologies. However, costs associated with capturing by using currently available technology amine scrubbing are very high. emerging second‐generation use calcium‐based sorbents, which exploit carbonation calcination reactions CaO, namely, CaO+CO ↔CaCO 3 . Naturally occurring Ca‐based sorbents inexpensive, but show a rapid decay uptake capacity cycle number....
Hydrogen (H2) is a clean energy carrier and major industrial feedstock, e.g., to produce ammonia methanol. High-purity H2 can be produced efficiently from methane (CH4) using chemical looping-based approaches. In this work, we report on the development of calcium-iron-based oxygen (Ca2Fe2O5) doped with Ni or Cu investigate its redox performance for production when CH4 used as fuel. The experimental results suggest that rapid formation metallic through exsolution promotes reducibility...
The commercially dominating technology for hydrogen production (<italic>i.e.</italic> steam methane reforming) emits large quantities of CO<sub>2</sub> into the atmosphere. On other hand, thermochemical water-splitting cycles allow to produce high purity H<sub>2</sub> while simultaneously capturing CO<sub>2</sub>.
CaO is an effective high temperature CO2 sorbent that, however, suffers from a loss of its absorption capacity upon cycling due to sintering. The cyclic uptake CaO-based sorbents improved by Ca3Al2O6 as structural stabilizer. Nonetheless, the initially rather stable Ca3Al2O6-stabilized yet starts decay after around 10 cycles capture and regeneration, albeit at significantly reduced rate compared unmodified reference material. Here, we show combined use in situ XRD together with textural...
An integrated Ca/Cu looping process has been proposed recently for CO2 capture. It uses the exothermic in-situ reduction of CuO with methane or natural gas to supply heat required endothermic calcination CaCO3 regenerate CaO following sorption cycle via bifunctional CaO/CuO composites. composites possess excellent redox characteristics, but rapid decline in capture performance remains an unresolved problem. Two different types stabilizers, i.e., Al2O3 that can form a mixed phase CaO, and MgO...
Calcium looping (CaL) is a CO2 capture technique based on the reversible carbonation/calcination of CaO that considered promising to reduce anthropogenic emissions. However, rapid decay uptake over repeated cycles carbonation and calcination due sintering limits its implementation at industrial scale. Thus, development material design strategies stabilize capacity paramount. The addition alkali metal salts has been proposed as strategy mitigate loss cyclic capacity. there are conflicting...
Chemical looping combustion (CLC) is an emerging, new technology for carbon capture and storage (CCS). Copper-based oxygen carriers are of particular interest due to their high carrying capacity reactivity, low tendency deposition, exothermic reduction reactions. In this work, CuO-based Al2O3-stabilized with CuO loadings were developed using a coprecipitation technique. The cyclic redox performance the synthesized was evaluated at 800 °C in laboratory-scale fluidized bed reactor reducing...
Effective CO2 sorbents were manufactured utilizing inverse opal (IO)-like, CaO-based structures enabled by carbon nanosphere templates. To stabilize the against sintering, Ca3Al2O6 was incorporated via three different routes (i.e., one-pot synthesis, impregnation, and atomic layer deposition (ALD)). The realized through ALD-assisted synthesis methods exhibited a significantly enhanced uptake when compared to benchmark limestone sorbent postsynthesis impregnation. differences in performances...
The formation and nature of surface indium species in zirconia-supported catalysts for the hydrogenation CO2 to methanol has been investigated by infrared (IR) spectroscopy. We studied dissociation hydrogen on In2O3/m-ZrO2, In2O3/t-ZrO2, In2O3/am-ZrO2 m-ZrO2:In (m-, t- am- refers monoclinic, tetragonal amorphous, respectively is a solid solution material), with without redox pretreatment. Indium hydride hydroxyl groups form at room temperature all redox-treated upon their exposure hydrogen....