Methane Bubbled Through Seawater Can be Converted to Methanol With High Efficiency

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 21, 2025

Partial oxidation of methane (POM) is achieved by forming air-methane microbubbles in saltwater to which an alternating electric field applied using a copper oxide foam electrode. The solubility increased putting it contact with water containing dissolved KCl or NaCl (3%). Being fully dispersed as (20-40 µm diameter), reacts more hydroxyl radicals (OH·) at the gas-water interface. voltage (100 mV) generates two synergistic POM processes dominated Cl- → Cl· + e- and O2 -• under positive negative potentials, respectively. By tuning frequency amplitude, extent path process can be precisely controlled so that than 90% methanol selectively formed compared byproducts, dichloromethane, acetic acid. conversion yield estimated 57% rate approximately 887 µM h-1. This method appears have potential for removing from air seawater converting higher-concentration sources into value-added methanol.

Язык: Английский

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Innovative Undergraduate Experiments in Solid–Liquid Contact Electrification: Droplet Nanogenerators and Contact-Electro-Catalysis

Journal of Chemical Education, Год журнала: 2025, Номер unknown

Опубликована: Март 13, 2025

Язык: Английский

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Highly efficient oxidation of methane into methanol over Ni-promoted Cu/ZSM-5

RSC Advances, Год журнала: 2025, Номер 15(11), С. 8244 - 8252

Опубликована: Янв. 1, 2025

Ni-Promoted Cu/ZSM-5 catalyst presented an excellent methanol yield of 82 162 μmol g cat −1 h (with a selectivity ∼74%) in direct conversion methane to methanol.

Язык: Английский

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Charged Water Microdroplets Enable Dissociation of Surrounding Dioxygen

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Март 24, 2025

The cleavage of dioxygen (O2) into its atomic constituents typically requires harsh conditions and metal catalysts. We present a remarkable discovery demonstrating that can be activated, dissociated, subsequently transformed the ozone anion (O3-) without any catalyst at air-water interface in charged microdroplet sprays. Using online mass spectrometry, we directly detected splitting products O3- H2O·O3- microdroplets. high electric field interface, along with microlightning between oppositely water microdroplets, induces an electrical discharge responsible for O-O bond cleavage, leading to formation reactive oxygen species (ROS). Isotope labeling experiments further reveal various ROS, i.e., ·OH, CO3-, HCO4-, generated through reaction or CO2. This study introduces sustainable pathway molecular utilization offers new insights ROS generation

Язык: Английский

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Microdroplet Cascade Catalysis for Highly Selective Production of Propylene Glycol under Ambient Conditions

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Май 1, 2025

Conventional propylene glycol (PG) production relies on an energy-intensive two-step thermocatalytic process, contributing significantly to CO2 emissions. A sustainable alternative under ambient conditions remains elusive, hindered by challenges in selectivity and energy efficiency. Here, we present a cascade catalysis strategy for efficient selective PG within water microdroplets conditions. Propylene (CH3CH═CH2) is converted (CH3CH(OH)CH2OH) at the microdroplet/titanium silicalite-1 (TS-1) interface, driven situ generated hydrogen peroxide (H2O2) via methyl viologen catalysis. This approach harnesses microdroplet interface confine reaction, enhancing catalytic activity increasing selectivity. Our system achieves efficiency of 680 μM 88%, while minimizing unwanted side products demands. innovative method offers pathway synthesis highlights transformative potential technology advancing green chemistry industrial applications.

Язык: Английский

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Spontaneous Generation of Alkoxide Radical from Alcohols on Microdroplets Surface

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Окт. 31, 2024

Water microdroplets have been demonstrated to exhibit extraordinary chemical behaviors, including the abilities accelerate reactions by several orders of magnitude and trigger that cannot occur in bulk water. One most striking examples is spontaneous generation hydroxyl radical from hydroxide ions. Alcohols alkoxide ions, being structurally similar water might behavior on microdroplets. Here, we report radicals alcohols (RCH

Язык: Английский

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Addressing the Urgent Need for Direct Climate Cooling: Rationale and Options

Oxford Open Climate Change, Год журнала: 2024, Номер 4(1)

Опубликована: Янв. 1, 2024

Abstract Emissions reduction and removal are not proceeding at a pace that will limit global average warming to less than the Paris Agreement targets of 1.5°C or 2.0°C. Accelerating is indicated by record high 2023–2024 monthly temperatures annual 2023 mean surface around above pre-industrial levels. Only direct climate cooling has potential avert continued temperature rise in near term moderate least some projected change disruption including extreme weather, sea level rise, loss ice, glacier permafrost melting, coral reef die-off. Strategically deployed scale, starting term, several measures have reduce reverse warming. Others can exert local regional influences. The world needs an approach extends beyond sole reliance on emission reductions removal. We propose (i) researching, field testing deploying one more large-scale influence(s) perhaps initially polar regions applying also support adaptation, (ii) accelerating emissions with early prioritization short-lived drivers, (iii) large scale carbon draw down legacy greenhouse gas. authors make no attempt determine what mix optimal. That depend modeling experimentation. properly researched emergency “tourniquets,” near-term our “bleeding” Earth we slow then ongoing increasingly severe 21st Century.

Язык: Английский

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Catalyst-Free Oxidation of Styrene to Styrene Oxide Using Circulating Microdroplets in an Oxygen Atmosphere

Journal of the American Chemical Society, Год журнала: 2024, Номер unknown

Опубликована: Сен. 19, 2024

Water microdroplets possess unique interfacial properties that enable chemical reactions to occur spontaneously and increase the reaction rate by orders of magnitude. In this study, water containing styrene (SY) was cyclically sprayed into air form with an average diameter 6.7 μm. These allowed SY be oxidized oxide (SO) without catalysts. No oxidation products were observed in bulk solution under same conditions, while microdroplet 4.2% conversion approximately 3.1 mM SO detected. Compared traditional spraying method, product concentration enhanced 1000 times. Experiments proved aerobic environment boosts oxidation, leading a proposed dual-path hydrogen peroxide (H

Язык: Английский

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Spontaneous formation of reactive redox radical species at the interface of gas diffusion electrode

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Сен. 27, 2024

Язык: Английский

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Hydrogen peroxide mediated thermo-catalytic conversion of carbon dioxide to C1-C2 products over Cu (0)

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 156786 - 156786

Опубликована: Окт. 1, 2024

Язык: Английский

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