Textile microfibers valorization by catalytic hydrothermal carbonization toward high-tech carbonaceous materials.

Microplastics fibers shed from washing synthetic textiles are released directly into the waters and make up 35% of primary microplastics discharged to the aquatic environment. While filtration devices and regulations are in development, safe disposal methods remain absent. Herein, we investigate catalytic hydrothermal carbonization (HTC) as a means of integrating this waste (0.

Redefining the Symphony of Light Aromatic Synthesis Beyond Fossil Fuels: A Journey Navigating through a Fe-Based/HZSM-5 Tandem Route for Syngas Conversion.

The escalating concerns about traditional reliance on fossil fuels and environmental issues associated with their exploitation have spurred efforts to explore eco-friendly alternative processes. Since then, in an era where the imperative for renewable practices is paramount, the aromatic synthesis industry has embarked on a journey to diversify its feedstock portfolio, offering a transformative pathway toward carbon neutrality stewardship. This Review delves into the dynamic landscape of aromatic synthesis, elucidating the pivotal role of renewable resources through syngas/CO utilization in reshaping the industry's net-zero carbon narrative.

Embracing the sustainable horizons through bioenergy innovations: a path to a sustainable energy future.

The urgent need for mitigating climate change necessitates a transformative shift in energy production and consumption paradigms. Amidst this challenge, bioenergy emerges as a pivotal contributor to the global energy transition, offering a diverse array of solid, liquid, and gaseous fuels derived from biomass. This mini review delves into the unique potential of bioenergy innovations, particularly renewable diesel, bio jet fuel, and ethanol, to reduce greenhouse gas emissions and transform various industries.

Nickel-based cerium zirconate inorganic complex structures for CO valorisation via dry reforming of methane.

The increasing anthropogenic emissions of greenhouse gases (GHG) is encouraging extensive research in CO utilisation. Dry reforming of methane (DRM) depicts a viable strategy to convert both CO and CH into syngas, a worthwhile chemical intermediate. Among the different active phases for DRM, the use of nickel as catalyst is economically favourable, but typically deactivates due to sintering and carbon deposition.

Boosting Low-Temperature CO Hydrogenation over Ni-based Catalysts by Tuning Strong Metal-Support Interactions.

Rational design of low-cost and efficient transition-metal catalysts for low-temperature CO activation is significant and poses great challenges. Herein, a strategy via regulating the local electron density of active sites is developed to boost CO methanation that normally requires >350 °C for commercial Ni catalysts. An optimal Ni/ZrO catalyst affords an excellent low-temperature performance hitherto, with a CO conversion of 84.

Synthesis of a Graphene-Encapsulated FeC/Fe Catalyst Supported on Sporopollenin Exine Capsules and Its Use for the Reverse Water-Gas Shift Reaction.

Bioderived materials have emerged as sustainable catalyst supports for several heterogeneous reactions owing to their naturally occurring hierarchal pore size distribution, high surface area, and thermal and chemical stability. We utilize sporopollenin exine capsules (SpECs), a carbon-rich byproduct of pollen grains, composed primarily of polymerized and cross-linked lipids, to synthesize carbon-encapsulated iron nanoparticles via evaporative precipitation and pyrolytic treatments. The composition and morphology of the macroparticles were influenced by the precursor iron acetate concentration.

The Need for Flexible Chemical Synthesis and How Dual-Function Materials Can Pave the Way.

Since climate change keeps escalating, it is imperative that the increasing CO emissions be combated. Over recent years, research efforts have been aiming for the design and optimization of materials for CO capture and conversion to enable a circular economy. The uncertainties in the energy sector and the variations in supply and demand place an additional burden on the commercialization and implementation of these carbon capture and utilization technologies.

MIL-100(Fe)-derived catalysts for CO conversion via low- and high-temperature reverse water-gas shift reaction.

Fe-derived catalysts were synthesized by the pyrolysis of MIL-100 (Fe) metal-organic framework (MOF) and evaluated in the reverse water-gas shift (RWGS) reaction. The addition of Rh as a dopant by in-situ incorporation during the synthesis and wet impregnation was also considered. Our characterization data showed that the main active phase was a mixture of α-Fe, FeC, and FeO in all the catalysts evaluated.

Design of Full-Temperature-Range RWGS Catalysts: Impact of Alkali Promoters on Ni/CeO.

Reverse water gas shift (RWGS) competes with methanation as a direct pathway in the CO recycling route, with methanation being a dominant process in the low-temperature window and RWGS at higher temperatures. This work showcases the design of multi-component catalysts for a full-temperature-range RWGS behavior by suppressing the methanation reaction at low temperatures. The addition of alkali promoters (Na, K, and Cs) to the reference Ni/CeO catalyst allows identifying a clear trend in RWGS activation promotion in both low- and high-temperature ranges.

Flexible NiRu Systems for CO Methanation: From Efficient Catalysts to Advanced Dual-Function Materials.

CO emissions in the atmosphere have been increasing rapidly in recent years, causing global warming. CO methanation reaction is deemed to be a way to combat these emissions by converting CO into synthetic natural gas, i.e.

Emerging natural and tailored perovskite-type mixed oxides-based catalysts for CO conversions.

The rapid economic and societal development have led to unprecedented energy demand and consumption resulting in the harmful emission of pollutants. Hence, the conversion of greenhouse gases into valuable chemicals and fuels has become an urgent challenge for the scientific community. In recent decades, perovskite-type mixed oxide-based catalysts have attracted significant attention as efficient CO conversion catalysts due to the characteristics of both reversible oxygen storage capacity and stable structure compared to traditional oxide-supported catalysts.

Feasibility of switchable dual function materials as a flexible technology for CO capture and utilisation and evidence of passive direct air capture.

The feasibility of a Dual Function Material (DFM) with a versatile catalyst offering switchable chemical synthesis from carbon dioxide (CO) was demonstrated for the first time, showing evidence of the ability of these DFMs to passively capture CO directly from the air as well. These DFMs open up possibilities in flexible chemical production from dilute sources of CO, through a combination of CO adsorption and subsequent chemical transformation (methanation, reverse water gas shift or dry reforming of methane). Combinations of Ni Ru bimetallic catalyst with NaO, KO or CaO adsorbent were supported on CeO-AlO to develop flexible DFMs.

Catalytic Upgrading of Biomass-Gasification Mixtures Using Ni-Fe/MgAlO as a Bifunctional Catalyst.

Biomass gasification streams typically contain a mixture of CO, H, CH, and CO as the majority components and frequently require conditioning for downstream processes. Herein, we investigate the catalytic upgrading of surrogate biomass gasifiers through the generation of syngas. Seeking a bifunctional system capable of converting CO and CH to CO, a reverse water gas shift (RWGS) catalyst based on Fe/MgAlO was decorated with an increasing content of Ni metal and evaluated for producing syngas using different feedstock compositions.

Insights on Guerbet Reaction: Production of Biobutanol From Bioethanol Over a Mg-Al Spinel Catalyst.

The production of biobutanol from bioethanol by the Guerbet reaction is an alternative pathway to renewable sources. The commercial viability of this green route requires improvements in the process development. This study experimentally examines the influence of operating conditions on the performance of a Mg-Al spinel catalyst prepared from hydrotalcite precursors.

Bimetallic Ni-Ru and Ni-Re Catalysts for Dry Reforming of Methane: Understanding the Synergies of the Selected Promoters.

Designing an economically viable catalyst that maintains high catalytic activity and stability is the key to unlock dry reforming of methane (DRM) as a primary strategy for biogas valorization. Ni/AlO catalysts have been widely used for this purpose; however, several modifications have been reported in the last years in order to prevent coke deposition and deactivation of the samples. Modification of the acidity of the support and the addition of noble metal promoters are between the most reported strategies.

Biogas Conversion to Syngas Using Advanced Ni-Promoted Pyrochlore Catalysts: Effect of the CH/CO Ratio.

Biogas is defined as the mixture of CH and CO produced by the anaerobic digestion of biomass. This particular mixture can be transformed in high valuable intermediates such as syngas through a process known as dry reforming (DRM). The reaction involved is highly endothermic, and catalysts capable to endure carbon deposition and metal particle sintering are required.

Molybdenum Oxide Supported on TiAlC is an Active Reverse Water-Gas Shift Catalyst.

MAX phases are layered ternary carbides or nitrides that are attractive for catalysis applications due to their unusual set of properties. They show high thermal stability like ceramics, but they are also tough, ductile, and good conductors of heat and electricity like metals. Here, we study the potential of the TiAlC MAX phase as a support for molybdenum oxide for the reverse water-gas shift (RWGS) reaction, comparing this new catalyst to more traditional materials.

Molten Salt-Promoted MgO Adsorbents for CO Capture: Transient Kinetic Studies.

Optimization of MgO adsorbents is predominantly focused on the regulation of appropriate adsorption sites for CO associated with Mg-O sites of low coordination. Here, for the first time, we conducted transient kinetic experiments to identify and characterize changes of the CO molecular path in MgO-based CO adsorbents upon the addition of molten salt modifiers. Among the optimized samples, addition of 10 mol % NaNO on the surface of MgO exhibited the highest CO uptake (15.

In-situ formation of carboxylate species on TiO nanosheets for enhanced visible-light photocatalytic performance.

It still remains challenge for expanding the photo-response range of TiO with dominant {0 0 1} facets due to the hardly achieving modification of the electronic structure without destroying the formation of TiO high energy facets. Herein, we report the construction of carboxylate species modified TiO nanosheets with dominant {0 0 1} facets by employing ethanol as a carbon source through a low-temperature (300 °C) carbonization method. The as-obtained samples were investigated in detail by using various characterization techniques.

Influence of Reaction Parameters on the Catalytic Upgrading of an Acetone, Butanol, and Ethanol (ABE) Mixture: Exploring New Routes for Modern Biorefineries.

Here we present a comprehensive study on the effect of reaction parameters on the upgrade of an acetone, butanol and ethanol mixture-key molecules and platform products of great interest within the chemical sector. Using a selected high performing catalyst, Fe/MgO-AlO, the variation of temperature, reaction time, catalytic loading, and reactant molar ratio have been examined in this reaction. This work is aiming to not only optimize the reaction conditions previously used, but to step toward using less energy, time, and material by testing those conditions and analyzing the sufficiency of the results.