Deoxygenation
View article: Twenty-first century ocean warming, acidification, deoxygenation, and upper-ocean nutrient and primary production decline from CMIP6 model projections
Twenty-first century ocean warming, acidification, deoxygenation, and upper-ocean nutrient and primary production decline from CMIP6 model projections Open
Anthropogenic climate change is projected to lead to ocean warming, acidification, deoxygenation, reductions in near-surface nutrients, and changes to primary production, all of which are expected to affect marine ecosystems. Here we asses…
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Insight into biomass pyrolysis mechanism based on cellulose, hemicellulose, and lignin: Evolution of volatiles and kinetics, elucidation of reaction pathways, and characterization of gas, biochar and bio‐oil Open
Pyrolysis is the first step of gasification and combustion. The pyrolysis process of biomass is complicated, which is generally considered to consist of the pyrolysis of the three major components (i.e., cellulose, hemicellulose, and ligni…
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Bifunctional Catalysts for Upgrading of Biomass-Derived Oxygenates: A Review Open
Deoxygenation is an important reaction in the conversion of biomass-derived oxygenates to fuels and chemicals. A key route for biomass refining involves the production of pyrolysis oil through rapid heating of the raw biomass feedstock. Py…
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Ocean deoxygenation: everyone’s problem. Causes, impacts, consequences and solutions Open
Summary \n• The global oxygen inventory has decreased by ~2% over the period 1960 to 2010, this finding is supported by \nregional time series data that indicate a continuous decrease in oceanic dissolved oxygen. \n• Ocean model simulation…
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Phosphoranyl Radical Fragmentation Reactions Driven by Photoredox Catalysis Open
Photocatalytic generation of phosphoranyl radicals is fast emerging as an essential method for the generation of diverse and valuable radicals, typically via deoxygenation or desulfurization processes. This Perspective is a comprehensive e…
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Selective Deoxygenation of Biomass‐Derived Bio‐oils within Hydrogen‐Modest Environments: A Review and New Insights Open
Research development of processes for refining bio‐oils is becoming increasingly popular. One issue that these processes possess is their high requirement for H 2 gas. In response, researchers must develop catalysts that perform deoxygenat…
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A review on catalytic pyrolysis of microalgae to high-quality bio-oil with low oxygeneous and nitrogenous compounds Open
10.1016/j.rser.2019.03.026
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An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds Open
Pyrolysis is considered the most promising way to convert biomass to fuels. Upgrading biomass pyrolysis oil is essential to produce high quality hydrocarbon fuels. Upgrading technologies have been developed for decades, and this review foc…
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Hydrocracking, hydrogenation and hydro-deoxygenation of fatty acids, esters and glycerides: Mechanisms, kinetics and transport phenomena Open
Article offers a review of the mechanisms, kinetics and effects of the analysed process conditions on the conversion, selectivity and catalyst chemical stability of the hydrogenation, hydrocracking and hydro-deoxygenation (HDO) transformat…
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Recent Insights into Lignocellulosic Biomass Pyrolysis: A Critical Review on Pretreatment, Characterization, and Products Upgrading Open
Pyrolysis process has been considered to be an efficient approach for valorization of lignocellulosic biomass into bio-oil and value-added chemicals. Bio-oil refers to biomass pyrolysis liquid, which contains alkanes, aromatic compounds, p…
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Atomic Co─P Catalytic Pair Drives Efficient Electrochemical Nitrate Reduction to Ammonia Open
Electrochemically reducing nitrate (NO 3 − ), a common water pollutant, to valuable ammonia (NH 3 ) offers a green, sustainable, and decentralized route for ammonia synthesis. Electrochemical nitrate reduction reaction (NO 3 − RR) involves…
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Microbial Respiration, the Engine of Ocean Deoxygenation Open
Microbial plankton respiration is the key determinant in the balance between the storage of organic carbon in the oceans or its conversion to carbon dioxide with accompanying consumption of dissolved oxygen. Over the past 50 years, dissolv…
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Photoinduced Deoxygenative Borylations of Aliphatic Alcohols Open
A photochemical method for converting aliphatic alcohols into boronic esters is described. Preactivation of the alcohol as a 2‐iodophenyl‐thionocarbonate enables a novel Barton–McCombie‐type radical deoxygenation that proceeds efficiently …
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Catalytic Conversion of Coal and Biomass Volatiles: A Review Open
This paper presents a review of recent research on direct upgrading of coal/biomass volatiles into aromatics by catalytic pyrolysis and syngas by gasification with catalytic steam reforming. Coal/biomass valorization is considered an impor…
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Role of the Support and Reaction Conditions on the Vapor-Phase Deoxygenation of <i>m</i>-Cresol over Pt/C and Pt/TiO<sub>2</sub> Catalysts Open
The catalytic deoxygenation of biomass fast pyrolysis vapors offers a promising route for the sustainable production of liquid transportation fuels. However, a clear understanding of the mechanistic details involved in this process has yet…
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Constraining the rate of oceanic deoxygenation leading up to a Cretaceous Oceanic Anoxic Event (OAE-2: ~94 Ma) Open
A Tl isotope excursion preserved in shales leading up to OAE-2 provides evidence for progressive bottom water deoxygenation.
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Olefins from Biomass Intermediates: A Review Open
Over the last decade, increasing demand for olefins and their valuable products has prompted research on novel processes and technologies for their selective production. As olefins are predominately dependent on fossil resources, their pro…
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Ocean deoxygenation and zooplankton: Very small oxygen differences matter Open
Novel midwater ocean sampling shows that physiology dictates zooplankton distributions in submesoscale low oxygen features.
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Enhanced Hydrodeoxygenation of <i>m</i>-Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway Open
Supported bimetallic catalysts consisting of a noble metal (e.g., Pt) and an oxophilic metal (e.g., Mo) have received considerable attention for the hydrodeoxygenation of oxygenated aromatic compounds produced from biomass fast pyrolysis. …
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Patterns of deoxygenation: sensitivity to natural and anthropogenic drivers Open
Observational estimates and numerical models both indicate a significant overall decline in marine oxygen levels over the past few decades. Spatial patterns of oxygen change, however, differ considerably between observed and modelled estim…
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Role of Nitric Oxide Carried by Hemoglobin in Cardiovascular Physiology Open
A continuous supply of oxygen is essential for the survival of multicellular organisms. The understanding of how this supply is regulated in the microvasculature has evolved from viewing erythrocytes (red blood cells [RBCs]) as passive car…
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Steric Effect and Evolution of Surface Species in the Hydrodeoxygenation of Bio-Oil Model Compounds over Pt/HBEA Open
The hydrodeoxygenation of various bio-oil model compounds (anisole, m-cresol and guaiacol) over Pt/HBEA and the evolution of surface species is investigated. Depending on the functional group, different surface species are formed when the …
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A Global Ocean Oxygen Database and Atlas for Assessing and Predicting Deoxygenation and Ocean Health in the Open and Coastal Ocean Open
In this paper, we outline the need for a coordinated international effort toward the building of an open-access Global Ocean Oxygen Database and ATlas (GO 2 DAT) complying with the FAIR principles (Findable, Accessible, Interoperable, and …
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Protein-polymer bioconjugates via a versatile oxygen tolerant photoinduced controlled radical polymerization approach Open
The immense application potential of amphiphilic protein-polymer conjugates remains largely unexplored, as established “grafting from” synthetic protocols involve time-consuming, harsh and disruptive deoxygenation methods, while “grafting …
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Production of Jet Fuel‐Range Hydrocarbons from Hydrodeoxygenation of Lignin over Super Lewis Acid Combined with Metal Catalysts Open
Super Lewis acids containing the triflate anion [e.g., Hf(OTf) 4 , Ln(OTf) 3 , In(OTf) 3 , Al(OTf) 3 ] and noble metal catalysts (e.g., Ru/C, Ru/Al 2 O 3 ) formed efficient catalytic systems to generate saturated hydrocarbons from lignin i…
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Copper‐Mediated Polymerization without External Deoxygenation or Oxygen Scavengers Open
As a method for overcoming the challenge of rigorous deoxygenation in copper‐mediated controlled radical polymerization processes [e.g., atom‐transfer radical polymerization (ATRP)], reported here is a simple Cu 0 ‐RDRP (RDRP=reversible de…
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Overview of catalytic upgrading of biomass pyrolysis vapors toward the production of fuels and high‐value chemicals Open
The application of heterogeneous catalysis in biomass pyrolysis is considered as one of the most promising methods to improve bio‐oil quality by minimizing its undesirable properties (high viscosity, corrosivity, instability, etc.) and pro…
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Strategies for the Development of Glycomimetic Drug Candidates Open
Carbohydrates are a structurally-diverse group of natural products which play an important role in numerous biological processes, including immune regulation, infection, and cancer metastasis. Many diseases have been correlated with change…
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<i>O</i>-Benzyl Xanthate Esters under Ni/Photoredox Dual Catalysis: Selective Radical Generation and Csp<sup>3</sup>–Csp<sup>2</sup> Cross-Coupling Open
Alkyl xanthate esters are perhaps best known for their use in deoxygenation chemistry. However, their use in cross-coupling chemistry has not been productive, which is due, in part, to inadequate xanthate activation strategies. Herein, we …
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An Improved P<sup>III</sup>/P<sup>V</sup>═O-Catalyzed Reductive C–N Coupling of Nitroaromatics and Boronic Acids by Mechanistic Differentiation of Rate- and Product-Determining Steps Open
Experimental, spectroscopic, and computational studies are reported that provide an evidence-based mechanistic description of an intermolecular reductive C-N coupling of nitroarenes and arylboronic acids catalyzed by a redox-active main-gr…